1 /**
2 * \file
3 *
4 * Author:
5 * Mono Project (http://www.mono-project.com)
6 *
7 * Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
8 * Copyright 2004-2009 Novell, Inc (http://www.novell.com)
9 * Copyright 2011 Rodrigo Kumpera
10 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
11 */
12 #include <config.h>
13
14 #include <mono/metadata/object-internals.h>
15 #include <mono/metadata/dynamic-image-internals.h>
16 #include <mono/metadata/verify.h>
17 #include <mono/metadata/verify-internals.h>
18 #include <mono/metadata/opcodes.h>
19 #include <mono/metadata/tabledefs.h>
20 #include <mono/metadata/reflection.h>
21 #include <mono/metadata/debug-helpers.h>
22 #include <mono/metadata/mono-endian.h>
23 #include <mono/metadata/metadata.h>
24 #include <mono/metadata/metadata-internals.h>
25 #include <mono/metadata/class-internals.h>
26 #include <mono/metadata/security-manager.h>
27 #include <mono/metadata/security-core-clr.h>
28 #include <mono/metadata/tokentype.h>
29 #include <mono/metadata/mono-basic-block.h>
30 #include <mono/metadata/attrdefs.h>
31 #include <mono/utils/mono-counters.h>
32 #include <mono/utils/monobitset.h>
33 #include <string.h>
34 #include <ctype.h>
35
36 static MiniVerifierMode verifier_mode = MONO_VERIFIER_MODE_OFF;
37 static gboolean verify_all = FALSE;
38
39 /*
40 * Set the desired level of checks for the verfier.
41 *
42 */
43 void
mono_verifier_set_mode(MiniVerifierMode mode)44 mono_verifier_set_mode (MiniVerifierMode mode)
45 {
46 verifier_mode = mode;
47 }
48
49 void
mono_verifier_enable_verify_all()50 mono_verifier_enable_verify_all ()
51 {
52 verify_all = TRUE;
53 }
54
55 #ifndef DISABLE_VERIFIER
56 /*
57 * Pull the list of opcodes
58 */
59 #define OPDEF(a,b,c,d,e,f,g,h,i,j) \
60 a = i,
61
62 enum {
63 #include "mono/cil/opcode.def"
64 LAST = 0xff
65 };
66 #undef OPDEF
67
68 #ifdef MONO_VERIFIER_DEBUG
69 #define VERIFIER_DEBUG(code) do { code } while (0)
70 #else
71 #define VERIFIER_DEBUG(code)
72 #endif
73
74 //////////////////////////////////////////////////////////////////
75 #define IS_STRICT_MODE(ctx) (((ctx)->level & MONO_VERIFY_NON_STRICT) == 0)
76 #define IS_FAIL_FAST_MODE(ctx) (((ctx)->level & MONO_VERIFY_FAIL_FAST) == MONO_VERIFY_FAIL_FAST)
77 #define IS_SKIP_VISIBILITY(ctx) (((ctx)->level & MONO_VERIFY_SKIP_VISIBILITY) == MONO_VERIFY_SKIP_VISIBILITY)
78 #define IS_REPORT_ALL_ERRORS(ctx) (((ctx)->level & MONO_VERIFY_REPORT_ALL_ERRORS) == MONO_VERIFY_REPORT_ALL_ERRORS)
79 #define CLEAR_PREFIX(ctx, prefix) do { (ctx)->prefix_set &= ~(prefix); } while (0)
80 #define ADD_VERIFY_INFO(__ctx, __msg, __status, __exception) \
81 do { \
82 MonoVerifyInfoExtended *vinfo = g_new (MonoVerifyInfoExtended, 1); \
83 vinfo->info.status = __status; \
84 vinfo->info.message = ( __msg ); \
85 vinfo->exception_type = (__exception); \
86 (__ctx)->list = g_slist_prepend ((__ctx)->list, vinfo); \
87 } while (0)
88
89 //TODO support MONO_VERIFY_REPORT_ALL_ERRORS
90 #define ADD_VERIFY_ERROR(__ctx, __msg) \
91 do { \
92 ADD_VERIFY_INFO(__ctx, __msg, MONO_VERIFY_ERROR, MONO_EXCEPTION_INVALID_PROGRAM); \
93 (__ctx)->valid = 0; \
94 } while (0)
95
96 #define CODE_NOT_VERIFIABLE(__ctx, __msg) \
97 do { \
98 if ((__ctx)->verifiable || IS_REPORT_ALL_ERRORS (__ctx)) { \
99 ADD_VERIFY_INFO(__ctx, __msg, MONO_VERIFY_NOT_VERIFIABLE, MONO_EXCEPTION_UNVERIFIABLE_IL); \
100 (__ctx)->verifiable = 0; \
101 if (IS_FAIL_FAST_MODE (__ctx)) \
102 (__ctx)->valid = 0; \
103 } \
104 } while (0)
105
106 #define ADD_VERIFY_ERROR2(__ctx, __msg, __exception) \
107 do { \
108 ADD_VERIFY_INFO(__ctx, __msg, MONO_VERIFY_ERROR, __exception); \
109 (__ctx)->valid = 0; \
110 } while (0)
111
112 #define CODE_NOT_VERIFIABLE2(__ctx, __msg, __exception) \
113 do { \
114 if ((__ctx)->verifiable || IS_REPORT_ALL_ERRORS (__ctx)) { \
115 ADD_VERIFY_INFO(__ctx, __msg, MONO_VERIFY_NOT_VERIFIABLE, __exception); \
116 (__ctx)->verifiable = 0; \
117 if (IS_FAIL_FAST_MODE (__ctx)) \
118 (__ctx)->valid = 0; \
119 } \
120 } while (0)
121
122 #define CHECK_ADD4_OVERFLOW_UN(a, b) ((guint32)(0xFFFFFFFFU) - (guint32)(b) < (guint32)(a))
123 #define CHECK_ADD8_OVERFLOW_UN(a, b) ((guint64)(0xFFFFFFFFFFFFFFFFUL) - (guint64)(b) < (guint64)(a))
124
125 #if SIZEOF_VOID_P == 4
126 #define CHECK_ADDP_OVERFLOW_UN(a,b) CHECK_ADD4_OVERFLOW_UN(a, b)
127 #else
128 #define CHECK_ADDP_OVERFLOW_UN(a,b) CHECK_ADD8_OVERFLOW_UN(a, b)
129 #endif
130
131 #define ADDP_IS_GREATER_OR_OVF(a, b, c) (((a) + (b) > (c)) || CHECK_ADDP_OVERFLOW_UN (a, b))
132 #define ADD_IS_GREATER_OR_OVF(a, b, c) (((a) + (b) > (c)) || CHECK_ADD4_OVERFLOW_UN (a, b))
133
134 /*Flags to be used with ILCodeDesc::flags */
135 enum {
136 /*Instruction has not been processed.*/
137 IL_CODE_FLAG_NOT_PROCESSED = 0,
138 /*Instruction was decoded by mono_method_verify loop.*/
139 IL_CODE_FLAG_SEEN = 1,
140 /*Instruction was target of a branch or is at a protected block boundary.*/
141 IL_CODE_FLAG_WAS_TARGET = 2,
142 /*Used by stack_init to avoid double initialize each entry.*/
143 IL_CODE_FLAG_STACK_INITED = 4,
144 /*Used by merge_stacks to decide if it should just copy the eval stack.*/
145 IL_CODE_STACK_MERGED = 8,
146 /*This instruction is part of the delegate construction sequence, it cannot be target of a branch.*/
147 IL_CODE_DELEGATE_SEQUENCE = 0x10,
148 /*This is a delegate created from a ldftn to a non final virtual method*/
149 IL_CODE_LDFTN_DELEGATE_NONFINAL_VIRTUAL = 0x20,
150 /*This is a call to a non final virtual method*/
151 IL_CODE_CALL_NONFINAL_VIRTUAL = 0x40,
152 };
153
154 typedef enum {
155 RESULT_VALID,
156 RESULT_UNVERIFIABLE,
157 RESULT_INVALID
158 } verify_result_t;
159
160 typedef struct {
161 MonoType *type;
162 int stype;
163 MonoMethod *method;
164 } ILStackDesc;
165
166
167 typedef struct {
168 ILStackDesc *stack;
169 guint16 size, max_size;
170 guint16 flags;
171 } ILCodeDesc;
172
173 typedef struct {
174 int max_args;
175 int max_stack;
176 int verifiable;
177 int valid;
178 int level;
179
180 int code_size;
181 ILCodeDesc *code;
182 ILCodeDesc eval;
183
184 MonoType **params;
185 GSList *list;
186 /*Allocated fnptr MonoType that should be freed by us.*/
187 GSList *funptrs;
188 /*Type dup'ed exception types from catch blocks.*/
189 GSList *exception_types;
190
191 int num_locals;
192 MonoType **locals;
193 char *locals_verification_state;
194
195 /*TODO get rid of target here, need_merge in mono_method_verify and hoist the merging code in the branching code*/
196 int target;
197
198 guint32 ip_offset;
199 MonoMethodSignature *signature;
200 MonoMethodHeader *header;
201
202 MonoGenericContext *generic_context;
203 MonoImage *image;
204 MonoMethod *method;
205
206 /*This flag helps solving a corner case of delegate verification in that you cannot have a "starg 0"
207 *on a method that creates a delegate for a non-final virtual method using ldftn*/
208 gboolean has_this_store;
209
210 /*This flag is used to control if the contructor of the parent class has been called.
211 *If the this pointer is pushed on the eval stack and it's a reference type constructor and
212 * super_ctor_called is false, the uninitialized flag is set on the pushed value.
213 *
214 * Poping an uninitialized this ptr from the eval stack is an unverifiable operation unless
215 * the safe variant is used. Only a few opcodes can use it : dup, pop, ldfld, stfld and call to a constructor.
216 */
217 gboolean super_ctor_called;
218
219 guint32 prefix_set;
220 gboolean has_flags;
221 MonoType *constrained_type;
222 } VerifyContext;
223
224 static void
225 merge_stacks (VerifyContext *ctx, ILCodeDesc *from, ILCodeDesc *to, gboolean start, gboolean external);
226
227 static int
228 get_stack_type (MonoType *type);
229
230 static gboolean
231 mono_delegate_signature_equal (MonoMethodSignature *delegate_sig, MonoMethodSignature *method_sig, gboolean is_static_ldftn);
232
233 static gboolean
234 mono_class_is_valid_generic_instantiation (VerifyContext *ctx, MonoClass *klass);
235
236 static gboolean
237 mono_method_is_valid_generic_instantiation (VerifyContext *ctx, MonoMethod *method);
238
239 static MonoGenericParam*
240 verifier_get_generic_param_from_type (VerifyContext *ctx, MonoType *type);
241
242 static gboolean
243 verifier_class_is_assignable_from (MonoClass *target, MonoClass *candidate);
244 //////////////////////////////////////////////////////////////////
245
246
247
248 enum {
249 TYPE_INV = 0, /* leave at 0. */
250 TYPE_I4 = 1,
251 TYPE_I8 = 2,
252 TYPE_NATIVE_INT = 3,
253 TYPE_R8 = 4,
254 /* Used by operator tables to resolve pointer types (managed & unmanaged) and by unmanaged pointer types*/
255 TYPE_PTR = 5,
256 /* value types and classes */
257 TYPE_COMPLEX = 6,
258 /* Number of types, used to define the size of the tables*/
259 TYPE_MAX = 6,
260
261 /* Used by tables to signal that a result is not verifiable*/
262 NON_VERIFIABLE_RESULT = 0x80,
263
264 /*Mask used to extract just the type, excluding flags */
265 TYPE_MASK = 0x0F,
266
267 /* The stack type is a managed pointer, unmask the value to res */
268 POINTER_MASK = 0x100,
269
270 /*Stack type with the pointer mask*/
271 RAW_TYPE_MASK = 0x10F,
272
273 /* Controlled Mutability Manager Pointer */
274 CMMP_MASK = 0x200,
275
276 /* The stack type is a null literal*/
277 NULL_LITERAL_MASK = 0x400,
278
279 /**Used by ldarg.0 and family to let delegate verification happens.*/
280 THIS_POINTER_MASK = 0x800,
281
282 /**Signals that this is a boxed value type*/
283 BOXED_MASK = 0x1000,
284
285 /*This is an unitialized this ref*/
286 UNINIT_THIS_MASK = 0x2000,
287
288 /* This is a safe to return byref */
289 SAFE_BYREF_MASK = 0x4000,
290 };
291
292 static const char* const
293 type_names [TYPE_MAX + 1] = {
294 "Invalid",
295 "Int32",
296 "Int64",
297 "Native Int",
298 "Float64",
299 "Native Pointer",
300 "Complex"
301 };
302
303 enum {
304 PREFIX_UNALIGNED = 1,
305 PREFIX_VOLATILE = 2,
306 PREFIX_TAIL = 4,
307 PREFIX_CONSTRAINED = 8,
308 PREFIX_READONLY = 16
309 };
310 //////////////////////////////////////////////////////////////////
311
312 #ifdef ENABLE_VERIFIER_STATS
313
314 #define _MEM_ALLOC(amt) do { allocated_memory += (amt); working_set += (amt); } while (0)
315 #define _MEM_FREE(amt) do { working_set -= (amt); } while (0)
316
317 static int allocated_memory;
318 static int working_set;
319 static int max_allocated_memory;
320 static int max_working_set;
321 static int total_allocated_memory;
322
323 static void
finish_collect_stats(void)324 finish_collect_stats (void)
325 {
326 max_allocated_memory = MAX (max_allocated_memory, allocated_memory);
327 max_working_set = MAX (max_working_set, working_set);
328 total_allocated_memory += allocated_memory;
329 allocated_memory = working_set = 0;
330 }
331
332 static void
init_verifier_stats(void)333 init_verifier_stats (void)
334 {
335 static gboolean inited;
336 if (!inited) {
337 inited = TRUE;
338 mono_counters_register ("Maximum memory allocated during verification", MONO_COUNTER_METADATA | MONO_COUNTER_INT, &max_allocated_memory);
339 mono_counters_register ("Maximum memory used during verification", MONO_COUNTER_METADATA | MONO_COUNTER_INT, &max_working_set);
340 mono_counters_register ("Total memory allocated for verification", MONO_COUNTER_METADATA | MONO_COUNTER_INT, &total_allocated_memory);
341 }
342 }
343
344 #else
345
346 #define _MEM_ALLOC(amt) do {} while (0)
347 #define _MEM_FREE(amt) do { } while (0)
348
349 #define finish_collect_stats()
350 #define init_verifier_stats()
351
352 #endif
353
354
355 //////////////////////////////////////////////////////////////////
356
357
358 /*Token validation macros and functions */
359 #define IS_MEMBER_REF(token) (mono_metadata_token_table (token) == MONO_TABLE_MEMBERREF)
360 #define IS_METHOD_DEF(token) (mono_metadata_token_table (token) == MONO_TABLE_METHOD)
361 #define IS_METHOD_SPEC(token) (mono_metadata_token_table (token) == MONO_TABLE_METHODSPEC)
362 #define IS_FIELD_DEF(token) (mono_metadata_token_table (token) == MONO_TABLE_FIELD)
363
364 #define IS_TYPE_REF(token) (mono_metadata_token_table (token) == MONO_TABLE_TYPEREF)
365 #define IS_TYPE_DEF(token) (mono_metadata_token_table (token) == MONO_TABLE_TYPEDEF)
366 #define IS_TYPE_SPEC(token) (mono_metadata_token_table (token) == MONO_TABLE_TYPESPEC)
367 #define IS_METHOD_DEF_OR_REF_OR_SPEC(token) (IS_METHOD_DEF (token) || IS_MEMBER_REF (token) || IS_METHOD_SPEC (token))
368 #define IS_TYPE_DEF_OR_REF_OR_SPEC(token) (IS_TYPE_DEF (token) || IS_TYPE_REF (token) || IS_TYPE_SPEC (token))
369 #define IS_FIELD_DEF_OR_REF(token) (IS_FIELD_DEF (token) || IS_MEMBER_REF (token))
370
371 /*
372 * Verify if @token refers to a valid row on int's table.
373 */
374 static gboolean
token_bounds_check(MonoImage * image,guint32 token)375 token_bounds_check (MonoImage *image, guint32 token)
376 {
377 if (image_is_dynamic (image))
378 return mono_dynamic_image_is_valid_token ((MonoDynamicImage*)image, token);
379 return image->tables [mono_metadata_token_table (token)].rows >= mono_metadata_token_index (token) && mono_metadata_token_index (token) > 0;
380 }
381
382 static MonoType *
mono_type_create_fnptr_from_mono_method(VerifyContext * ctx,MonoMethod * method)383 mono_type_create_fnptr_from_mono_method (VerifyContext *ctx, MonoMethod *method)
384 {
385 MonoType *res = g_new0 (MonoType, 1);
386 _MEM_ALLOC (sizeof (MonoType));
387
388 //FIXME use mono_method_get_signature_full
389 res->data.method = mono_method_signature (method);
390 res->type = MONO_TYPE_FNPTR;
391 ctx->funptrs = g_slist_prepend (ctx->funptrs, res);
392 return res;
393 }
394
395 /*
396 * mono_type_is_enum_type:
397 *
398 * Returns: TRUE if @type is an enum type.
399 */
400 static gboolean
mono_type_is_enum_type(MonoType * type)401 mono_type_is_enum_type (MonoType *type)
402 {
403 if (type->type == MONO_TYPE_VALUETYPE && type->data.klass->enumtype)
404 return TRUE;
405 if (type->type == MONO_TYPE_GENERICINST && type->data.generic_class->container_class->enumtype)
406 return TRUE;
407 return FALSE;
408 }
409
410 /*
411 * mono_type_is_value_type:
412 *
413 * Returns: TRUE if @type is named after @namespace.@name.
414 *
415 */
416 static gboolean
mono_type_is_value_type(MonoType * type,const char * namespace_,const char * name)417 mono_type_is_value_type (MonoType *type, const char *namespace_, const char *name)
418 {
419 return type->type == MONO_TYPE_VALUETYPE &&
420 !strcmp (namespace_, type->data.klass->name_space) &&
421 !strcmp (name, type->data.klass->name);
422 }
423
424 /*
425 * Returns TURE if @type is VAR or MVAR
426 */
427 static gboolean
mono_type_is_generic_argument(MonoType * type)428 mono_type_is_generic_argument (MonoType *type)
429 {
430 return type->type == MONO_TYPE_VAR || type->type == MONO_TYPE_MVAR;
431 }
432
433 /*
434 * mono_type_get_underlying_type_any:
435 *
436 * This functions is just like mono_type_get_underlying_type but it doesn't care if the type is byref.
437 *
438 * Returns the underlying type of @type regardless if it is byref or not.
439 */
440 static MonoType*
mono_type_get_underlying_type_any(MonoType * type)441 mono_type_get_underlying_type_any (MonoType *type)
442 {
443 if (type->type == MONO_TYPE_VALUETYPE && type->data.klass->enumtype)
444 return mono_class_enum_basetype (type->data.klass);
445 if (type->type == MONO_TYPE_GENERICINST && type->data.generic_class->container_class->enumtype)
446 return mono_class_enum_basetype (type->data.generic_class->container_class);
447 return type;
448 }
449
450 static G_GNUC_UNUSED const char*
mono_type_get_stack_name(MonoType * type)451 mono_type_get_stack_name (MonoType *type)
452 {
453 return type_names [get_stack_type (type) & TYPE_MASK];
454 }
455
456 #define CTOR_REQUIRED_FLAGS (METHOD_ATTRIBUTE_SPECIAL_NAME | METHOD_ATTRIBUTE_RT_SPECIAL_NAME)
457 #define CTOR_INVALID_FLAGS (METHOD_ATTRIBUTE_STATIC)
458
459 static gboolean
mono_method_is_constructor(MonoMethod * method)460 mono_method_is_constructor (MonoMethod *method)
461 {
462 return ((method->flags & CTOR_REQUIRED_FLAGS) == CTOR_REQUIRED_FLAGS &&
463 !(method->flags & CTOR_INVALID_FLAGS) &&
464 !strcmp (".ctor", method->name));
465 }
466
467 static gboolean
mono_class_has_default_constructor(MonoClass * klass)468 mono_class_has_default_constructor (MonoClass *klass)
469 {
470 MonoMethod *method;
471 int i;
472
473 mono_class_setup_methods (klass);
474 if (mono_class_has_failure (klass))
475 return FALSE;
476
477 int mcount = mono_class_get_method_count (klass);
478 for (i = 0; i < mcount; ++i) {
479 method = klass->methods [i];
480 if (mono_method_is_constructor (method) &&
481 mono_method_signature (method) &&
482 mono_method_signature (method)->param_count == 0 &&
483 (method->flags & METHOD_ATTRIBUTE_MEMBER_ACCESS_MASK) == METHOD_ATTRIBUTE_PUBLIC)
484 return TRUE;
485 }
486 return FALSE;
487 }
488
489 /*
490 * Verify if @type is valid for the given @ctx verification context.
491 * this function checks for VAR and MVAR types that are invalid under the current verifier,
492 */
493 static gboolean
mono_type_is_valid_type_in_context_full(MonoType * type,MonoGenericContext * context,gboolean check_gtd)494 mono_type_is_valid_type_in_context_full (MonoType *type, MonoGenericContext *context, gboolean check_gtd)
495 {
496 int i;
497 MonoGenericInst *inst;
498
499 switch (type->type) {
500 case MONO_TYPE_VAR:
501 case MONO_TYPE_MVAR:
502 if (!context)
503 return FALSE;
504 inst = type->type == MONO_TYPE_VAR ? context->class_inst : context->method_inst;
505 if (!inst || mono_type_get_generic_param_num (type) >= inst->type_argc)
506 return FALSE;
507 break;
508 case MONO_TYPE_SZARRAY:
509 return mono_type_is_valid_type_in_context_full (&type->data.klass->byval_arg, context, check_gtd);
510 case MONO_TYPE_ARRAY:
511 return mono_type_is_valid_type_in_context_full (&type->data.array->eklass->byval_arg, context, check_gtd);
512 case MONO_TYPE_PTR:
513 return mono_type_is_valid_type_in_context_full (type->data.type, context, check_gtd);
514 case MONO_TYPE_GENERICINST:
515 inst = type->data.generic_class->context.class_inst;
516 if (!inst->is_open)
517 break;
518 for (i = 0; i < inst->type_argc; ++i)
519 if (!mono_type_is_valid_type_in_context_full (inst->type_argv [i], context, check_gtd))
520 return FALSE;
521 break;
522 case MONO_TYPE_CLASS:
523 case MONO_TYPE_VALUETYPE: {
524 MonoClass *klass = type->data.klass;
525 /*
526 * It's possible to encode generic'sh types in such a way that they disguise themselves as class or valuetype.
527 * Fixing the type decoding is really tricky since under some cases this behavior is needed, for example, to
528 * have a 'class' type pointing to a 'genericinst' class.
529 *
530 * For the runtime these non canonical (weird) encodings work fine, the worst they can cause is some
531 * reflection oddities which are harmless - to security at least.
532 */
533 if (klass->byval_arg.type != type->type)
534 return mono_type_is_valid_type_in_context_full (&klass->byval_arg, context, check_gtd);
535
536 if (check_gtd && mono_class_is_gtd (klass))
537 return FALSE;
538 break;
539 }
540 default:
541 break;
542 }
543 return TRUE;
544 }
545
546 static gboolean
mono_type_is_valid_type_in_context(MonoType * type,MonoGenericContext * context)547 mono_type_is_valid_type_in_context (MonoType *type, MonoGenericContext *context)
548 {
549 return mono_type_is_valid_type_in_context_full (type, context, FALSE);
550 }
551
552 /*This function returns NULL if the type is not instantiatable*/
553 static MonoType*
verifier_inflate_type(VerifyContext * ctx,MonoType * type,MonoGenericContext * context)554 verifier_inflate_type (VerifyContext *ctx, MonoType *type, MonoGenericContext *context)
555 {
556 MonoError error;
557 MonoType *result;
558
559 result = mono_class_inflate_generic_type_checked (type, context, &error);
560 if (!mono_error_ok (&error)) {
561 mono_error_cleanup (&error);
562 return NULL;
563 }
564 return result;
565 }
566
567 /*A side note here. We don't need to check if arguments are broken since this
568 is only need to be done by the runtime before realizing the type.
569 */
570 static gboolean
is_valid_generic_instantiation(MonoGenericContainer * gc,MonoGenericContext * context,MonoGenericInst * ginst)571 is_valid_generic_instantiation (MonoGenericContainer *gc, MonoGenericContext *context, MonoGenericInst *ginst)
572 {
573 MonoError error;
574 int i;
575
576 if (ginst->type_argc != gc->type_argc)
577 return FALSE;
578
579 for (i = 0; i < gc->type_argc; ++i) {
580 MonoGenericParamInfo *param_info = mono_generic_container_get_param_info (gc, i);
581 MonoClass *paramClass;
582 MonoClass **constraints;
583 MonoType *param_type = ginst->type_argv [i];
584
585 /*it's not our job to validate type variables*/
586 if (mono_type_is_generic_argument (param_type))
587 continue;
588
589 paramClass = mono_class_from_mono_type (param_type);
590
591
592 /* A GTD can't be a generic argument.
593 *
594 * Due to how types are encoded we must check for the case of a genericinst MonoType and GTD MonoClass.
595 * This happens in cases such as: class Foo<T> { void X() { new Bar<T> (); } }
596 *
597 * Open instantiations can have GTDs as this happens when one type is instantiated with others params
598 * and the former has an expansion into the later. For example:
599 * class B<K> {}
600 * class A<T>: B<K> {}
601 * The type A <K> has a parent B<K>, that is inflated into the GTD B<>.
602 * Since A<K> is open, thus not instantiatable, this is valid.
603 */
604 if (mono_class_is_gtd (paramClass) && param_type->type != MONO_TYPE_GENERICINST && !ginst->is_open)
605 return FALSE;
606
607 /*it's not safe to call mono_class_init from here*/
608 if (mono_class_is_ginst (paramClass) && !paramClass->inited) {
609 if (!mono_class_is_valid_generic_instantiation (NULL, paramClass))
610 return FALSE;
611 }
612
613 if (!param_info->constraints && !(param_info->flags & GENERIC_PARAMETER_ATTRIBUTE_SPECIAL_CONSTRAINTS_MASK))
614 continue;
615
616 if ((param_info->flags & GENERIC_PARAMETER_ATTRIBUTE_VALUE_TYPE_CONSTRAINT) && (!paramClass->valuetype || mono_class_is_nullable (paramClass)))
617 return FALSE;
618
619 if ((param_info->flags & GENERIC_PARAMETER_ATTRIBUTE_REFERENCE_TYPE_CONSTRAINT) && paramClass->valuetype)
620 return FALSE;
621
622 if ((param_info->flags & GENERIC_PARAMETER_ATTRIBUTE_CONSTRUCTOR_CONSTRAINT) && !paramClass->valuetype && !mono_class_has_default_constructor (paramClass))
623 return FALSE;
624
625 if (!param_info->constraints)
626 continue;
627
628 for (constraints = param_info->constraints; *constraints; ++constraints) {
629 MonoClass *ctr = *constraints;
630 MonoType *inflated;
631
632 inflated = mono_class_inflate_generic_type_checked (&ctr->byval_arg, context, &error);
633 if (!mono_error_ok (&error)) {
634 mono_error_cleanup (&error);
635 return FALSE;
636 }
637 ctr = mono_class_from_mono_type (inflated);
638 mono_metadata_free_type (inflated);
639
640 /*FIXME maybe we need the same this as verifier_class_is_assignable_from*/
641 if (!mono_class_is_assignable_from_slow (ctr, paramClass))
642 return FALSE;
643 }
644 }
645 return TRUE;
646 }
647
648 /**
649 * mono_generic_param_is_constraint_compatible:
650 *
651 * \returns TRUE if \p candidate is constraint compatible with \p target.
652 *
653 * This means that \p candidate constraints are a super set of \p target constaints
654 */
655 static gboolean
mono_generic_param_is_constraint_compatible(VerifyContext * ctx,MonoGenericParam * target,MonoGenericParam * candidate,MonoClass * candidate_param_class,MonoGenericContext * context)656 mono_generic_param_is_constraint_compatible (VerifyContext *ctx, MonoGenericParam *target, MonoGenericParam *candidate, MonoClass *candidate_param_class, MonoGenericContext *context)
657 {
658 MonoGenericParamInfo *tinfo = mono_generic_param_info (target);
659 MonoGenericParamInfo *cinfo = mono_generic_param_info (candidate);
660 MonoClass **candidate_class;
661 gboolean class_constraint_satisfied = FALSE;
662 gboolean valuetype_constraint_satisfied = FALSE;
663
664 int tmask = tinfo->flags & GENERIC_PARAMETER_ATTRIBUTE_SPECIAL_CONSTRAINTS_MASK;
665 int cmask = cinfo->flags & GENERIC_PARAMETER_ATTRIBUTE_SPECIAL_CONSTRAINTS_MASK;
666
667 if (cinfo->constraints) {
668 for (candidate_class = cinfo->constraints; *candidate_class; ++candidate_class) {
669 MonoClass *cc;
670 MonoType *inflated = verifier_inflate_type (ctx, &(*candidate_class)->byval_arg, ctx->generic_context);
671 if (!inflated)
672 return FALSE;
673 cc = mono_class_from_mono_type (inflated);
674 mono_metadata_free_type (inflated);
675
676 if (mono_type_is_reference (&cc->byval_arg) && !MONO_CLASS_IS_INTERFACE (cc))
677 class_constraint_satisfied = TRUE;
678 else if (!mono_type_is_reference (&cc->byval_arg) && !MONO_CLASS_IS_INTERFACE (cc))
679 valuetype_constraint_satisfied = TRUE;
680 }
681 }
682 class_constraint_satisfied |= (cmask & GENERIC_PARAMETER_ATTRIBUTE_REFERENCE_TYPE_CONSTRAINT) != 0;
683 valuetype_constraint_satisfied |= (cmask & GENERIC_PARAMETER_ATTRIBUTE_VALUE_TYPE_CONSTRAINT) != 0;
684
685 if ((tmask & GENERIC_PARAMETER_ATTRIBUTE_REFERENCE_TYPE_CONSTRAINT) && !class_constraint_satisfied)
686 return FALSE;
687 if ((tmask & GENERIC_PARAMETER_ATTRIBUTE_VALUE_TYPE_CONSTRAINT) && !valuetype_constraint_satisfied)
688 return FALSE;
689 if ((tmask & GENERIC_PARAMETER_ATTRIBUTE_CONSTRUCTOR_CONSTRAINT) && !((cmask & GENERIC_PARAMETER_ATTRIBUTE_CONSTRUCTOR_CONSTRAINT) ||
690 valuetype_constraint_satisfied)) {
691 return FALSE;
692 }
693
694
695 if (tinfo->constraints) {
696 MonoClass **target_class;
697 for (target_class = tinfo->constraints; *target_class; ++target_class) {
698 MonoClass *tc;
699 MonoType *inflated = verifier_inflate_type (ctx, &(*target_class)->byval_arg, context);
700 if (!inflated)
701 return FALSE;
702 tc = mono_class_from_mono_type (inflated);
703 mono_metadata_free_type (inflated);
704
705 /*
706 * A constraint from @target might inflate into @candidate itself and in that case we don't need
707 * check it's constraints since it satisfy the constraint by itself.
708 */
709 if (mono_metadata_type_equal (&tc->byval_arg, &candidate_param_class->byval_arg))
710 continue;
711
712 if (!cinfo->constraints)
713 return FALSE;
714
715 for (candidate_class = cinfo->constraints; *candidate_class; ++candidate_class) {
716 MonoClass *cc;
717 inflated = verifier_inflate_type (ctx, &(*candidate_class)->byval_arg, ctx->generic_context);
718 if (!inflated)
719 return FALSE;
720 cc = mono_class_from_mono_type (inflated);
721 mono_metadata_free_type (inflated);
722
723 if (verifier_class_is_assignable_from (tc, cc))
724 break;
725
726 /*
727 * This happens when we have the following:
728 *
729 * Bar<K> where K : IFace
730 * Foo<T, U> where T : U where U : IFace
731 * ...
732 * Bar<T> <- T here satisfy K constraint transitively through to U's constraint
733 *
734 */
735 if (mono_type_is_generic_argument (&cc->byval_arg)) {
736 MonoGenericParam *other_candidate = verifier_get_generic_param_from_type (ctx, &cc->byval_arg);
737
738 if (mono_generic_param_is_constraint_compatible (ctx, target, other_candidate, cc, context)) {
739 break;
740 }
741 }
742 }
743 if (!*candidate_class)
744 return FALSE;
745 }
746 }
747 return TRUE;
748 }
749
750 static MonoGenericParam*
verifier_get_generic_param_from_type(VerifyContext * ctx,MonoType * type)751 verifier_get_generic_param_from_type (VerifyContext *ctx, MonoType *type)
752 {
753 MonoGenericContainer *gc;
754 MonoMethod *method = ctx->method;
755 int num;
756
757 num = mono_type_get_generic_param_num (type);
758
759 if (type->type == MONO_TYPE_VAR) {
760 MonoClass *gtd = method->klass;
761 if (mono_class_is_ginst (gtd))
762 gtd = mono_class_get_generic_class (gtd)->container_class;
763 gc = mono_class_try_get_generic_container (gtd);
764 } else { //MVAR
765 MonoMethod *gmd = method;
766 if (method->is_inflated)
767 gmd = ((MonoMethodInflated*)method)->declaring;
768 gc = mono_method_get_generic_container (gmd);
769 }
770 if (!gc)
771 return NULL;
772 return mono_generic_container_get_param (gc, num);
773 }
774
775
776
777 /*
778 * Verify if @type is valid for the given @ctx verification context.
779 * this function checks for VAR and MVAR types that are invalid under the current verifier,
780 * This means that it either
781 */
782 static gboolean
is_valid_type_in_context(VerifyContext * ctx,MonoType * type)783 is_valid_type_in_context (VerifyContext *ctx, MonoType *type)
784 {
785 return mono_type_is_valid_type_in_context (type, ctx->generic_context);
786 }
787
788 static gboolean
is_valid_generic_instantiation_in_context(VerifyContext * ctx,MonoGenericInst * ginst,gboolean check_gtd)789 is_valid_generic_instantiation_in_context (VerifyContext *ctx, MonoGenericInst *ginst, gboolean check_gtd)
790 {
791 int i;
792 for (i = 0; i < ginst->type_argc; ++i) {
793 MonoType *type = ginst->type_argv [i];
794
795 if (!mono_type_is_valid_type_in_context_full (type, ctx->generic_context, TRUE))
796 return FALSE;
797 }
798 return TRUE;
799 }
800
801 static gboolean
generic_arguments_respect_constraints(VerifyContext * ctx,MonoGenericContainer * gc,MonoGenericContext * context,MonoGenericInst * ginst)802 generic_arguments_respect_constraints (VerifyContext *ctx, MonoGenericContainer *gc, MonoGenericContext *context, MonoGenericInst *ginst)
803 {
804 int i;
805 for (i = 0; i < ginst->type_argc; ++i) {
806 MonoType *type = ginst->type_argv [i];
807 MonoGenericParam *target = mono_generic_container_get_param (gc, i);
808 MonoGenericParam *candidate;
809 MonoClass *candidate_class;
810
811 if (!mono_type_is_generic_argument (type))
812 continue;
813
814 if (!is_valid_type_in_context (ctx, type))
815 return FALSE;
816
817 candidate = verifier_get_generic_param_from_type (ctx, type);
818 candidate_class = mono_class_from_mono_type (type);
819
820 if (!mono_generic_param_is_constraint_compatible (ctx, target, candidate, candidate_class, context))
821 return FALSE;
822 }
823 return TRUE;
824 }
825
826 static gboolean
mono_method_repect_method_constraints(VerifyContext * ctx,MonoMethod * method)827 mono_method_repect_method_constraints (VerifyContext *ctx, MonoMethod *method)
828 {
829 MonoMethodInflated *gmethod = (MonoMethodInflated *)method;
830 MonoGenericInst *ginst = gmethod->context.method_inst;
831 MonoGenericContainer *gc = mono_method_get_generic_container (gmethod->declaring);
832 return !gc || generic_arguments_respect_constraints (ctx, gc, &gmethod->context, ginst);
833 }
834
835 static gboolean
mono_class_repect_method_constraints(VerifyContext * ctx,MonoClass * klass)836 mono_class_repect_method_constraints (VerifyContext *ctx, MonoClass *klass)
837 {
838 MonoGenericClass *gklass = mono_class_get_generic_class (klass);
839 MonoGenericInst *ginst = gklass->context.class_inst;
840 MonoGenericContainer *gc = mono_class_get_generic_container (gklass->container_class);
841 return !gc || generic_arguments_respect_constraints (ctx, gc, &gklass->context, ginst);
842 }
843
844 static gboolean
mono_method_is_valid_generic_instantiation(VerifyContext * ctx,MonoMethod * method)845 mono_method_is_valid_generic_instantiation (VerifyContext *ctx, MonoMethod *method)
846 {
847 MonoMethodInflated *gmethod = (MonoMethodInflated *)method;
848 MonoGenericInst *ginst = gmethod->context.method_inst;
849 MonoGenericContainer *gc = mono_method_get_generic_container (gmethod->declaring);
850 if (!gc) /*non-generic inflated method - it's part of a generic type */
851 return TRUE;
852 if (ctx && !is_valid_generic_instantiation_in_context (ctx, ginst, TRUE))
853 return FALSE;
854 return is_valid_generic_instantiation (gc, &gmethod->context, ginst);
855
856 }
857
858 static gboolean
mono_class_is_valid_generic_instantiation(VerifyContext * ctx,MonoClass * klass)859 mono_class_is_valid_generic_instantiation (VerifyContext *ctx, MonoClass *klass)
860 {
861 MonoGenericClass *gklass = mono_class_get_generic_class (klass);
862 MonoGenericInst *ginst = gklass->context.class_inst;
863 MonoGenericContainer *gc = mono_class_get_generic_container (gklass->container_class);
864 if (ctx && !is_valid_generic_instantiation_in_context (ctx, ginst, TRUE))
865 return FALSE;
866 return is_valid_generic_instantiation (gc, &gklass->context, ginst);
867 }
868
869 static gboolean
mono_type_is_valid_in_context(VerifyContext * ctx,MonoType * type)870 mono_type_is_valid_in_context (VerifyContext *ctx, MonoType *type)
871 {
872 MonoClass *klass;
873
874 if (type == NULL) {
875 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid null type at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
876 return FALSE;
877 }
878
879 if (!is_valid_type_in_context (ctx, type)) {
880 char *str = mono_type_full_name (type);
881 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid generic type (%s%s) (argument out of range or %s is not generic) at 0x%04x",
882 str [0] == '!' ? "" : type->type == MONO_TYPE_VAR ? "!" : "!!",
883 str,
884 type->type == MONO_TYPE_VAR ? "class" : "method",
885 ctx->ip_offset),
886 MONO_EXCEPTION_BAD_IMAGE);
887 g_free (str);
888 return FALSE;
889 }
890
891 klass = mono_class_from_mono_type (type);
892 mono_class_init (klass);
893 if (mono_class_has_failure (klass)) {
894 if (mono_class_is_ginst (klass) && !mono_class_is_valid_generic_instantiation (NULL, klass))
895 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid generic instantiation of type %s.%s at 0x%04x", klass->name_space, klass->name, ctx->ip_offset), MONO_EXCEPTION_TYPE_LOAD);
896 else
897 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Could not load type %s.%s at 0x%04x", klass->name_space, klass->name, ctx->ip_offset), MONO_EXCEPTION_TYPE_LOAD);
898 return FALSE;
899 }
900
901 if (mono_class_is_ginst (klass) && mono_class_has_failure (mono_class_get_generic_class (klass)->container_class)) {
902 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Could not load type %s.%s at 0x%04x", klass->name_space, klass->name, ctx->ip_offset), MONO_EXCEPTION_TYPE_LOAD);
903 return FALSE;
904 }
905
906 if (!mono_class_is_ginst (klass))
907 return TRUE;
908
909 if (!mono_class_is_valid_generic_instantiation (ctx, klass)) {
910 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid generic type instantiation of type %s.%s at 0x%04x", klass->name_space, klass->name, ctx->ip_offset), MONO_EXCEPTION_TYPE_LOAD);
911 return FALSE;
912 }
913
914 if (!mono_class_repect_method_constraints (ctx, klass)) {
915 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid generic type instantiation of type %s.%s (generic args don't respect target's constraints) at 0x%04x", klass->name_space, klass->name, ctx->ip_offset), MONO_EXCEPTION_TYPE_LOAD);
916 return FALSE;
917 }
918
919 return TRUE;
920 }
921
922 static verify_result_t
mono_method_is_valid_in_context(VerifyContext * ctx,MonoMethod * method)923 mono_method_is_valid_in_context (VerifyContext *ctx, MonoMethod *method)
924 {
925 if (!mono_type_is_valid_in_context (ctx, &method->klass->byval_arg))
926 return RESULT_INVALID;
927
928 if (!method->is_inflated)
929 return RESULT_VALID;
930
931 if (!mono_method_is_valid_generic_instantiation (ctx, method)) {
932 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid generic method instantiation of method %s.%s::%s at 0x%04x", method->klass->name_space, method->klass->name, method->name, ctx->ip_offset), MONO_EXCEPTION_UNVERIFIABLE_IL);
933 return RESULT_INVALID;
934 }
935
936 if (!mono_method_repect_method_constraints (ctx, method)) {
937 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid generic method instantiation of method %s.%s::%s (generic args don't respect target's constraints) at 0x%04x", method->klass->name_space, method->klass->name, method->name, ctx->ip_offset));
938 return RESULT_UNVERIFIABLE;
939 }
940 return RESULT_VALID;
941 }
942
943
944 static MonoClassField*
verifier_load_field(VerifyContext * ctx,int token,MonoClass ** out_klass,const char * opcode)945 verifier_load_field (VerifyContext *ctx, int token, MonoClass **out_klass, const char *opcode) {
946 MonoError error;
947 MonoClassField *field;
948 MonoClass *klass = NULL;
949
950 if (ctx->method->wrapper_type != MONO_WRAPPER_NONE) {
951 field = (MonoClassField *)mono_method_get_wrapper_data (ctx->method, (guint32)token);
952 klass = field ? field->parent : NULL;
953 } else {
954 if (!IS_FIELD_DEF_OR_REF (token) || !token_bounds_check (ctx->image, token)) {
955 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid field token 0x%08x for %s at 0x%04x", token, opcode, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
956 return NULL;
957 }
958
959 field = mono_field_from_token_checked (ctx->image, token, &klass, ctx->generic_context, &error);
960 mono_error_cleanup (&error); /*FIXME don't swallow the error */
961 }
962
963 if (!field || !field->parent || !klass) {
964 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Cannot load field from token 0x%08x for %s at 0x%04x", token, opcode, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
965 return NULL;
966 }
967
968 if (!mono_type_is_valid_in_context (ctx, &klass->byval_arg))
969 return NULL;
970
971 if (mono_field_get_flags (field) & FIELD_ATTRIBUTE_LITERAL) {
972 char *type_name = mono_type_get_full_name (field->parent);
973 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Cannot reference literal field %s::%s at 0x%04x", type_name, field->name, ctx->ip_offset));
974 g_free (type_name);
975 return NULL;
976 }
977
978 *out_klass = klass;
979 return field;
980 }
981
982 static MonoMethod*
verifier_load_method(VerifyContext * ctx,int token,const char * opcode)983 verifier_load_method (VerifyContext *ctx, int token, const char *opcode) {
984 MonoMethod* method;
985
986
987 if (ctx->method->wrapper_type != MONO_WRAPPER_NONE) {
988 method = (MonoMethod *)mono_method_get_wrapper_data (ctx->method, (guint32)token);
989 } else {
990 MonoError error;
991 if (!IS_METHOD_DEF_OR_REF_OR_SPEC (token) || !token_bounds_check (ctx->image, token)) {
992 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid method token 0x%08x for %s at 0x%04x", token, opcode, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
993 return NULL;
994 }
995
996 method = mono_get_method_checked (ctx->image, token, NULL, ctx->generic_context, &error);
997 mono_error_cleanup (&error); /* FIXME don't swallow this error */
998 }
999
1000 if (!method) {
1001 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Cannot load method from token 0x%08x for %s at 0x%04x", token, opcode, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
1002 return NULL;
1003 }
1004
1005 if (mono_method_is_valid_in_context (ctx, method) == RESULT_INVALID)
1006 return NULL;
1007
1008 return method;
1009 }
1010
1011 static MonoType*
verifier_load_type(VerifyContext * ctx,int token,const char * opcode)1012 verifier_load_type (VerifyContext *ctx, int token, const char *opcode) {
1013 MonoType* type;
1014
1015 if (ctx->method->wrapper_type != MONO_WRAPPER_NONE) {
1016 MonoClass *klass = (MonoClass *)mono_method_get_wrapper_data (ctx->method, (guint32)token);
1017 type = klass ? &klass->byval_arg : NULL;
1018 } else {
1019 MonoError error;
1020 if (!IS_TYPE_DEF_OR_REF_OR_SPEC (token) || !token_bounds_check (ctx->image, token)) {
1021 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid type token 0x%08x at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
1022 return NULL;
1023 }
1024 type = mono_type_get_checked (ctx->image, token, ctx->generic_context, &error);
1025 mono_error_cleanup (&error); /*FIXME don't swallow the error */
1026 }
1027
1028 if (!type) {
1029 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Cannot load type from token 0x%08x for %s at 0x%04x", token, opcode, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
1030 return NULL;
1031 }
1032
1033 if (!mono_type_is_valid_in_context (ctx, type))
1034 return NULL;
1035
1036 return type;
1037 }
1038
1039
1040 /* stack_slot_get_type:
1041 *
1042 * Returns the stack type of @value. This value includes POINTER_MASK.
1043 *
1044 * Use this function to checks that account for a managed pointer.
1045 */
1046 static gint32
stack_slot_get_type(ILStackDesc * value)1047 stack_slot_get_type (ILStackDesc *value)
1048 {
1049 return value->stype & RAW_TYPE_MASK;
1050 }
1051
1052 /* stack_slot_get_underlying_type:
1053 *
1054 * Returns the stack type of @value. This value does not include POINTER_MASK.
1055 *
1056 * Use this function is cases where the fact that the value could be a managed pointer is
1057 * irrelevant. For example, field load doesn't care about this fact of type on stack.
1058 */
1059 static gint32
stack_slot_get_underlying_type(ILStackDesc * value)1060 stack_slot_get_underlying_type (ILStackDesc *value)
1061 {
1062 return value->stype & TYPE_MASK;
1063 }
1064
1065 /* stack_slot_is_managed_pointer:
1066 *
1067 * Returns TRUE is @value is a managed pointer.
1068 */
1069 static gboolean
stack_slot_is_managed_pointer(ILStackDesc * value)1070 stack_slot_is_managed_pointer (ILStackDesc *value)
1071 {
1072 return (value->stype & POINTER_MASK) == POINTER_MASK;
1073 }
1074
1075 /* stack_slot_is_managed_mutability_pointer:
1076 *
1077 * Returns TRUE is @value is a managed mutability pointer.
1078 */
1079 static G_GNUC_UNUSED gboolean
stack_slot_is_managed_mutability_pointer(ILStackDesc * value)1080 stack_slot_is_managed_mutability_pointer (ILStackDesc *value)
1081 {
1082 return (value->stype & CMMP_MASK) == CMMP_MASK;
1083 }
1084
1085 /* stack_slot_is_null_literal:
1086 *
1087 * Returns TRUE is @value is the null literal.
1088 */
1089 static gboolean
stack_slot_is_null_literal(ILStackDesc * value)1090 stack_slot_is_null_literal (ILStackDesc *value)
1091 {
1092 return (value->stype & NULL_LITERAL_MASK) == NULL_LITERAL_MASK;
1093 }
1094
1095
1096 /* stack_slot_is_this_pointer:
1097 *
1098 * Returns TRUE is @value is the this literal
1099 */
1100 static gboolean
stack_slot_is_this_pointer(ILStackDesc * value)1101 stack_slot_is_this_pointer (ILStackDesc *value)
1102 {
1103 return (value->stype & THIS_POINTER_MASK) == THIS_POINTER_MASK;
1104 }
1105
1106 /* stack_slot_is_boxed_value:
1107 *
1108 * Returns TRUE is @value is a boxed value
1109 */
1110 static gboolean
stack_slot_is_boxed_value(ILStackDesc * value)1111 stack_slot_is_boxed_value (ILStackDesc *value)
1112 {
1113 return (value->stype & BOXED_MASK) == BOXED_MASK;
1114 }
1115
1116 /* stack_slot_is_safe_byref:
1117 *
1118 * Returns TRUE is @value is a safe byref
1119 */
1120 static gboolean
stack_slot_is_safe_byref(ILStackDesc * value)1121 stack_slot_is_safe_byref (ILStackDesc *value)
1122 {
1123 return (value->stype & SAFE_BYREF_MASK) == SAFE_BYREF_MASK;
1124 }
1125
1126 static const char *
stack_slot_get_name(ILStackDesc * value)1127 stack_slot_get_name (ILStackDesc *value)
1128 {
1129 return type_names [value->stype & TYPE_MASK];
1130 }
1131
1132 enum {
1133 SAFE_BYREF_LOCAL = 1,
1134 UNSAFE_BYREF_LOCAL = 2
1135 };
1136 static gboolean
local_is_safe_byref(VerifyContext * ctx,unsigned int arg)1137 local_is_safe_byref (VerifyContext *ctx, unsigned int arg)
1138 {
1139 return ctx->locals_verification_state [arg] == SAFE_BYREF_LOCAL;
1140 }
1141
1142 static gboolean
local_is_unsafe_byref(VerifyContext * ctx,unsigned int arg)1143 local_is_unsafe_byref (VerifyContext *ctx, unsigned int arg)
1144 {
1145 return ctx->locals_verification_state [arg] == UNSAFE_BYREF_LOCAL;
1146 }
1147
1148 #define APPEND_WITH_PREDICATE(PRED,NAME) do {\
1149 if (PRED (value)) { \
1150 if (!first) \
1151 g_string_append (str, ", "); \
1152 g_string_append (str, NAME); \
1153 first = FALSE; \
1154 } } while (0)
1155
1156 static char*
stack_slot_stack_type_full_name(ILStackDesc * value)1157 stack_slot_stack_type_full_name (ILStackDesc *value)
1158 {
1159 GString *str = g_string_new ("");
1160 char *result;
1161 gboolean has_pred = FALSE, first = TRUE;
1162
1163 if ((value->stype & TYPE_MASK) != value->stype) {
1164 g_string_append(str, "[");
1165 APPEND_WITH_PREDICATE (stack_slot_is_this_pointer, "this");
1166 APPEND_WITH_PREDICATE (stack_slot_is_boxed_value, "boxed");
1167 APPEND_WITH_PREDICATE (stack_slot_is_null_literal, "null");
1168 APPEND_WITH_PREDICATE (stack_slot_is_managed_mutability_pointer, "cmmp");
1169 APPEND_WITH_PREDICATE (stack_slot_is_managed_pointer, "mp");
1170 APPEND_WITH_PREDICATE (stack_slot_is_safe_byref, "safe-byref");
1171 has_pred = TRUE;
1172 }
1173
1174 if (mono_type_is_generic_argument (value->type) && !stack_slot_is_boxed_value (value)) {
1175 if (!has_pred)
1176 g_string_append(str, "[");
1177 if (!first)
1178 g_string_append (str, ", ");
1179 g_string_append (str, "unboxed");
1180 has_pred = TRUE;
1181 }
1182
1183 if (has_pred)
1184 g_string_append(str, "] ");
1185
1186 g_string_append (str, stack_slot_get_name (value));
1187 result = str->str;
1188 g_string_free (str, FALSE);
1189 return result;
1190 }
1191
1192 static char*
stack_slot_full_name(ILStackDesc * value)1193 stack_slot_full_name (ILStackDesc *value)
1194 {
1195 char *type_name = mono_type_full_name (value->type);
1196 char *stack_name = stack_slot_stack_type_full_name (value);
1197 char *res = g_strdup_printf ("%s (%s)", type_name, stack_name);
1198 g_free (type_name);
1199 g_free (stack_name);
1200 return res;
1201 }
1202
1203 //////////////////////////////////////////////////////////////////
1204
1205 /**
1206 * mono_free_verify_list:
1207 */
1208 void
mono_free_verify_list(GSList * list)1209 mono_free_verify_list (GSList *list)
1210 {
1211 MonoVerifyInfoExtended *info;
1212 GSList *tmp;
1213
1214 for (tmp = list; tmp; tmp = tmp->next) {
1215 info = (MonoVerifyInfoExtended *)tmp->data;
1216 g_free (info->info.message);
1217 g_free (info);
1218 }
1219 g_slist_free (list);
1220 }
1221
1222 #define ADD_ERROR(list,msg) \
1223 do { \
1224 MonoVerifyInfoExtended *vinfo = g_new (MonoVerifyInfoExtended, 1); \
1225 vinfo->info.status = MONO_VERIFY_ERROR; \
1226 vinfo->info.message = (msg); \
1227 (list) = g_slist_prepend ((list), vinfo); \
1228 } while (0)
1229
1230 #define ADD_WARN(list,code,msg) \
1231 do { \
1232 MonoVerifyInfoExtended *vinfo = g_new (MonoVerifyInfoExtended, 1); \
1233 vinfo->info.status = (code); \
1234 vinfo->info.message = (msg); \
1235 (list) = g_slist_prepend ((list), vinfo); \
1236 } while (0)
1237
1238 #define ADD_INVALID(list,msg) \
1239 do { \
1240 MonoVerifyInfoExtended *vinfo = g_new (MonoVerifyInfoExtended, 1); \
1241 vinfo->status = MONO_VERIFY_ERROR; \
1242 vinfo->message = (msg); \
1243 (list) = g_slist_prepend ((list), vinfo); \
1244 /*G_BREAKPOINT ();*/ \
1245 goto invalid_cil; \
1246 } while (0)
1247
1248 #define CHECK_STACK_UNDERFLOW(num) \
1249 do { \
1250 if (cur_stack < (num)) \
1251 ADD_INVALID (list, g_strdup_printf ("Stack underflow at 0x%04x (%d items instead of %d)", ip_offset, cur_stack, (num))); \
1252 } while (0)
1253
1254 #define CHECK_STACK_OVERFLOW() \
1255 do { \
1256 if (cur_stack >= max_stack) \
1257 ADD_INVALID (list, g_strdup_printf ("Maxstack exceeded at 0x%04x", ip_offset)); \
1258 } while (0)
1259
1260
1261 static int
in_any_block(MonoMethodHeader * header,guint offset)1262 in_any_block (MonoMethodHeader *header, guint offset)
1263 {
1264 int i;
1265 MonoExceptionClause *clause;
1266
1267 for (i = 0; i < header->num_clauses; ++i) {
1268 clause = &header->clauses [i];
1269 if (MONO_OFFSET_IN_CLAUSE (clause, offset))
1270 return 1;
1271 if (MONO_OFFSET_IN_HANDLER (clause, offset))
1272 return 1;
1273 if (MONO_OFFSET_IN_FILTER (clause, offset))
1274 return 1;
1275 }
1276 return 0;
1277 }
1278
1279 /*
1280 * in_any_exception_block:
1281 *
1282 * Returns TRUE is @offset is part of any exception clause (filter, handler, catch, finally or fault).
1283 */
1284 static gboolean
in_any_exception_block(MonoMethodHeader * header,guint offset)1285 in_any_exception_block (MonoMethodHeader *header, guint offset)
1286 {
1287 int i;
1288 MonoExceptionClause *clause;
1289
1290 for (i = 0; i < header->num_clauses; ++i) {
1291 clause = &header->clauses [i];
1292 if (MONO_OFFSET_IN_HANDLER (clause, offset))
1293 return TRUE;
1294 if (MONO_OFFSET_IN_FILTER (clause, offset))
1295 return TRUE;
1296 }
1297 return FALSE;
1298 }
1299
1300 /*
1301 * is_valid_branch_instruction:
1302 *
1303 * Verify if it's valid to perform a branch from @offset to @target.
1304 * This should be used with br and brtrue/false.
1305 * It returns 0 if valid, 1 for unverifiable and 2 for invalid.
1306 * The major difference from other similiar functions is that branching into a
1307 * finally/fault block is invalid instead of just unverifiable.
1308 */
1309 static int
is_valid_branch_instruction(MonoMethodHeader * header,guint offset,guint target)1310 is_valid_branch_instruction (MonoMethodHeader *header, guint offset, guint target)
1311 {
1312 int i;
1313 MonoExceptionClause *clause;
1314
1315 for (i = 0; i < header->num_clauses; ++i) {
1316 clause = &header->clauses [i];
1317 /*branching into a finally block is invalid*/
1318 if ((clause->flags == MONO_EXCEPTION_CLAUSE_FINALLY || clause->flags == MONO_EXCEPTION_CLAUSE_FAULT) &&
1319 !MONO_OFFSET_IN_HANDLER (clause, offset) &&
1320 MONO_OFFSET_IN_HANDLER (clause, target))
1321 return 2;
1322
1323 if (clause->try_offset != target && (MONO_OFFSET_IN_CLAUSE (clause, offset) ^ MONO_OFFSET_IN_CLAUSE (clause, target)))
1324 return 1;
1325 if (MONO_OFFSET_IN_HANDLER (clause, offset) ^ MONO_OFFSET_IN_HANDLER (clause, target))
1326 return 1;
1327 if (MONO_OFFSET_IN_FILTER (clause, offset) ^ MONO_OFFSET_IN_FILTER (clause, target))
1328 return 1;
1329 }
1330 return 0;
1331 }
1332
1333 /*
1334 * is_valid_cmp_branch_instruction:
1335 *
1336 * Verify if it's valid to perform a branch from @offset to @target.
1337 * This should be used with binary comparison branching instruction, like beq, bge and similars.
1338 * It returns 0 if valid, 1 for unverifiable and 2 for invalid.
1339 *
1340 * The major differences from other similar functions are that most errors lead to invalid
1341 * code and only branching out of finally, filter or fault clauses is unverifiable.
1342 */
1343 static int
is_valid_cmp_branch_instruction(MonoMethodHeader * header,guint offset,guint target)1344 is_valid_cmp_branch_instruction (MonoMethodHeader *header, guint offset, guint target)
1345 {
1346 int i;
1347 MonoExceptionClause *clause;
1348
1349 for (i = 0; i < header->num_clauses; ++i) {
1350 clause = &header->clauses [i];
1351 /*branching out of a handler or finally*/
1352 if (clause->flags != MONO_EXCEPTION_CLAUSE_NONE &&
1353 MONO_OFFSET_IN_HANDLER (clause, offset) &&
1354 !MONO_OFFSET_IN_HANDLER (clause, target))
1355 return 1;
1356
1357 if (clause->try_offset != target && (MONO_OFFSET_IN_CLAUSE (clause, offset) ^ MONO_OFFSET_IN_CLAUSE (clause, target)))
1358 return 2;
1359 if (MONO_OFFSET_IN_HANDLER (clause, offset) ^ MONO_OFFSET_IN_HANDLER (clause, target))
1360 return 2;
1361 if (MONO_OFFSET_IN_FILTER (clause, offset) ^ MONO_OFFSET_IN_FILTER (clause, target))
1362 return 2;
1363 }
1364 return 0;
1365 }
1366
1367 /*
1368 * A leave can't escape a finally block
1369 */
1370 static int
is_correct_leave(MonoMethodHeader * header,guint offset,guint target)1371 is_correct_leave (MonoMethodHeader *header, guint offset, guint target)
1372 {
1373 int i;
1374 MonoExceptionClause *clause;
1375
1376 for (i = 0; i < header->num_clauses; ++i) {
1377 clause = &header->clauses [i];
1378 if (clause->flags == MONO_EXCEPTION_CLAUSE_FINALLY && MONO_OFFSET_IN_HANDLER (clause, offset) && !MONO_OFFSET_IN_HANDLER (clause, target))
1379 return 0;
1380 if (MONO_OFFSET_IN_FILTER (clause, offset))
1381 return 0;
1382 }
1383 return 1;
1384 }
1385
1386 /*
1387 * A rethrow can't happen outside of a catch handler.
1388 */
1389 static int
is_correct_rethrow(MonoMethodHeader * header,guint offset)1390 is_correct_rethrow (MonoMethodHeader *header, guint offset)
1391 {
1392 int i;
1393 MonoExceptionClause *clause;
1394
1395 for (i = 0; i < header->num_clauses; ++i) {
1396 clause = &header->clauses [i];
1397 if (MONO_OFFSET_IN_HANDLER (clause, offset))
1398 return 1;
1399 }
1400 return 0;
1401 }
1402
1403 /*
1404 * An endfinally can't happen outside of a finally/fault handler.
1405 */
1406 static int
is_correct_endfinally(MonoMethodHeader * header,guint offset)1407 is_correct_endfinally (MonoMethodHeader *header, guint offset)
1408 {
1409 int i;
1410 MonoExceptionClause *clause;
1411
1412 for (i = 0; i < header->num_clauses; ++i) {
1413 clause = &header->clauses [i];
1414 if (MONO_OFFSET_IN_HANDLER (clause, offset) && (clause->flags == MONO_EXCEPTION_CLAUSE_FAULT || clause->flags == MONO_EXCEPTION_CLAUSE_FINALLY))
1415 return 1;
1416 }
1417 return 0;
1418 }
1419
1420
1421 /*
1422 * An endfilter can only happens inside a filter clause.
1423 * In non-strict mode filter is allowed inside the handler clause too
1424 */
1425 static MonoExceptionClause *
is_correct_endfilter(VerifyContext * ctx,guint offset)1426 is_correct_endfilter (VerifyContext *ctx, guint offset)
1427 {
1428 int i;
1429 MonoExceptionClause *clause;
1430
1431 for (i = 0; i < ctx->header->num_clauses; ++i) {
1432 clause = &ctx->header->clauses [i];
1433 if (clause->flags != MONO_EXCEPTION_CLAUSE_FILTER)
1434 continue;
1435 if (MONO_OFFSET_IN_FILTER (clause, offset))
1436 return clause;
1437 if (!IS_STRICT_MODE (ctx) && MONO_OFFSET_IN_HANDLER (clause, offset))
1438 return clause;
1439 }
1440 return NULL;
1441 }
1442
1443
1444 /*
1445 * Non-strict endfilter can happens inside a try block or any handler block
1446 */
1447 static int
is_unverifiable_endfilter(VerifyContext * ctx,guint offset)1448 is_unverifiable_endfilter (VerifyContext *ctx, guint offset)
1449 {
1450 int i;
1451 MonoExceptionClause *clause;
1452
1453 for (i = 0; i < ctx->header->num_clauses; ++i) {
1454 clause = &ctx->header->clauses [i];
1455 if (MONO_OFFSET_IN_CLAUSE (clause, offset))
1456 return 1;
1457 }
1458 return 0;
1459 }
1460
1461 static gboolean
is_valid_bool_arg(ILStackDesc * arg)1462 is_valid_bool_arg (ILStackDesc *arg)
1463 {
1464 if (stack_slot_is_managed_pointer (arg) || stack_slot_is_boxed_value (arg) || stack_slot_is_null_literal (arg))
1465 return TRUE;
1466
1467
1468 switch (stack_slot_get_underlying_type (arg)) {
1469 case TYPE_I4:
1470 case TYPE_I8:
1471 case TYPE_NATIVE_INT:
1472 case TYPE_PTR:
1473 return TRUE;
1474 case TYPE_COMPLEX:
1475 g_assert (arg->type);
1476 switch (arg->type->type) {
1477 case MONO_TYPE_CLASS:
1478 case MONO_TYPE_STRING:
1479 case MONO_TYPE_OBJECT:
1480 case MONO_TYPE_SZARRAY:
1481 case MONO_TYPE_ARRAY:
1482 case MONO_TYPE_FNPTR:
1483 case MONO_TYPE_PTR:
1484 return TRUE;
1485 case MONO_TYPE_GENERICINST:
1486 /*We need to check if the container class
1487 * of the generic type is a valuetype, iow:
1488 * is it a "class Foo<T>" or a "struct Foo<T>"?
1489 */
1490 return !arg->type->data.generic_class->container_class->valuetype;
1491 default:
1492 return FALSE;
1493 }
1494 default:
1495 return FALSE;
1496 }
1497 }
1498
1499
1500 /*Type manipulation helper*/
1501
1502 /*Returns the byref version of the supplied MonoType*/
1503 static MonoType*
mono_type_get_type_byref(MonoType * type)1504 mono_type_get_type_byref (MonoType *type)
1505 {
1506 if (type->byref)
1507 return type;
1508 return &mono_class_from_mono_type (type)->this_arg;
1509 }
1510
1511
1512 /*Returns the byval version of the supplied MonoType*/
1513 static MonoType*
mono_type_get_type_byval(MonoType * type)1514 mono_type_get_type_byval (MonoType *type)
1515 {
1516 if (!type->byref)
1517 return type;
1518 return &mono_class_from_mono_type (type)->byval_arg;
1519 }
1520
1521 static MonoType*
mono_type_from_stack_slot(ILStackDesc * slot)1522 mono_type_from_stack_slot (ILStackDesc *slot)
1523 {
1524 if (stack_slot_is_managed_pointer (slot))
1525 return mono_type_get_type_byref (slot->type);
1526 return slot->type;
1527 }
1528
1529 /*Stack manipulation code*/
1530
1531 static void
ensure_stack_size(ILCodeDesc * stack,int required)1532 ensure_stack_size (ILCodeDesc *stack, int required)
1533 {
1534 int new_size = 8;
1535 ILStackDesc *tmp;
1536
1537 if (required < stack->max_size)
1538 return;
1539
1540 /* We don't have to worry about the exponential growth since stack_copy prune unused space */
1541 new_size = MAX (8, MAX (required, stack->max_size * 2));
1542
1543 g_assert (new_size >= stack->size);
1544 g_assert (new_size >= required);
1545
1546 tmp = g_new0 (ILStackDesc, new_size);
1547 _MEM_ALLOC (sizeof (ILStackDesc) * new_size);
1548
1549 if (stack->stack) {
1550 if (stack->size)
1551 memcpy (tmp, stack->stack, stack->size * sizeof (ILStackDesc));
1552 g_free (stack->stack);
1553 _MEM_FREE (sizeof (ILStackDesc) * stack->max_size);
1554 }
1555
1556 stack->stack = tmp;
1557 stack->max_size = new_size;
1558 }
1559
1560 static void
stack_init(VerifyContext * ctx,ILCodeDesc * state)1561 stack_init (VerifyContext *ctx, ILCodeDesc *state)
1562 {
1563 if (state->flags & IL_CODE_FLAG_STACK_INITED)
1564 return;
1565 state->size = state->max_size = 0;
1566 state->flags |= IL_CODE_FLAG_STACK_INITED;
1567 }
1568
1569 static void
stack_copy(ILCodeDesc * to,ILCodeDesc * from)1570 stack_copy (ILCodeDesc *to, ILCodeDesc *from)
1571 {
1572 ensure_stack_size (to, from->size);
1573 to->size = from->size;
1574
1575 /*stack copy happens at merge points, which have small stacks*/
1576 if (from->size)
1577 memcpy (to->stack, from->stack, sizeof (ILStackDesc) * from->size);
1578 }
1579
1580 static void
copy_stack_value(ILStackDesc * to,ILStackDesc * from)1581 copy_stack_value (ILStackDesc *to, ILStackDesc *from)
1582 {
1583 to->stype = from->stype;
1584 to->type = from->type;
1585 to->method = from->method;
1586 }
1587
1588 static int
check_underflow(VerifyContext * ctx,int size)1589 check_underflow (VerifyContext *ctx, int size)
1590 {
1591 if (ctx->eval.size < size) {
1592 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Stack underflow, required %d, but have %d at 0x%04x", size, ctx->eval.size, ctx->ip_offset));
1593 return 0;
1594 }
1595 return 1;
1596 }
1597
1598 static int
check_overflow(VerifyContext * ctx)1599 check_overflow (VerifyContext *ctx)
1600 {
1601 if (ctx->eval.size >= ctx->max_stack) {
1602 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method doesn't have stack-depth %d at 0x%04x", ctx->eval.size + 1, ctx->ip_offset));
1603 return 0;
1604 }
1605 return 1;
1606 }
1607
1608 /*This reject out PTR, FNPTR and TYPEDBYREF*/
1609 static gboolean
check_unmanaged_pointer(VerifyContext * ctx,ILStackDesc * value)1610 check_unmanaged_pointer (VerifyContext *ctx, ILStackDesc *value)
1611 {
1612 if (stack_slot_get_type (value) == TYPE_PTR) {
1613 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Unmanaged pointer is not a verifiable type at 0x%04x", ctx->ip_offset));
1614 return 0;
1615 }
1616 return 1;
1617 }
1618
1619 /*TODO verify if MONO_TYPE_TYPEDBYREF is not allowed here as well.*/
1620 static gboolean
check_unverifiable_type(VerifyContext * ctx,MonoType * type)1621 check_unverifiable_type (VerifyContext *ctx, MonoType *type)
1622 {
1623 if (type->type == MONO_TYPE_PTR || type->type == MONO_TYPE_FNPTR) {
1624 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Unmanaged pointer is not a verifiable type at 0x%04x", ctx->ip_offset));
1625 return 0;
1626 }
1627 return 1;
1628 }
1629
1630 static ILStackDesc *
stack_push(VerifyContext * ctx)1631 stack_push (VerifyContext *ctx)
1632 {
1633 g_assert (ctx->eval.size < ctx->max_stack);
1634 g_assert (ctx->eval.size <= ctx->eval.max_size);
1635
1636 ensure_stack_size (&ctx->eval, ctx->eval.size + 1);
1637
1638 return & ctx->eval.stack [ctx->eval.size++];
1639 }
1640
1641 static ILStackDesc *
stack_push_val(VerifyContext * ctx,int stype,MonoType * type)1642 stack_push_val (VerifyContext *ctx, int stype, MonoType *type)
1643 {
1644 ILStackDesc *top = stack_push (ctx);
1645 top->stype = stype;
1646 top->type = type;
1647 return top;
1648 }
1649
1650 static ILStackDesc *
stack_pop(VerifyContext * ctx)1651 stack_pop (VerifyContext *ctx)
1652 {
1653 ILStackDesc *ret;
1654 g_assert (ctx->eval.size > 0);
1655 ret = ctx->eval.stack + --ctx->eval.size;
1656 if ((ret->stype & UNINIT_THIS_MASK) == UNINIT_THIS_MASK)
1657 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Found use of uninitialized 'this ptr' ref at 0x%04x", ctx->ip_offset));
1658 return ret;
1659 }
1660
1661 /* This function allows to safely pop an unititialized this ptr from
1662 * the eval stack without marking the method as unverifiable.
1663 */
1664 static ILStackDesc *
stack_pop_safe(VerifyContext * ctx)1665 stack_pop_safe (VerifyContext *ctx)
1666 {
1667 g_assert (ctx->eval.size > 0);
1668 return ctx->eval.stack + --ctx->eval.size;
1669 }
1670
1671 /*Positive number distance from stack top. [0] is stack top, [1] is the one below*/
1672 static ILStackDesc*
stack_peek(VerifyContext * ctx,int distance)1673 stack_peek (VerifyContext *ctx, int distance)
1674 {
1675 g_assert (ctx->eval.size - distance > 0);
1676 return ctx->eval.stack + (ctx->eval.size - 1 - distance);
1677 }
1678
1679 static ILStackDesc *
stack_push_stack_val(VerifyContext * ctx,ILStackDesc * value)1680 stack_push_stack_val (VerifyContext *ctx, ILStackDesc *value)
1681 {
1682 ILStackDesc *top = stack_push (ctx);
1683 copy_stack_value (top, value);
1684 return top;
1685 }
1686
1687 /* Returns the MonoType associated with the token, or NULL if it is invalid.
1688 *
1689 * A boxable type can be either a reference or value type, but cannot be a byref type or an unmanaged pointer
1690 * */
1691 static MonoType*
get_boxable_mono_type(VerifyContext * ctx,int token,const char * opcode)1692 get_boxable_mono_type (VerifyContext* ctx, int token, const char *opcode)
1693 {
1694 MonoType *type;
1695 MonoClass *klass;
1696
1697 if (!(type = verifier_load_type (ctx, token, opcode)))
1698 return NULL;
1699
1700 if (type->byref && type->type != MONO_TYPE_TYPEDBYREF) {
1701 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid use of byref type for %s at 0x%04x", opcode, ctx->ip_offset));
1702 return NULL;
1703 }
1704
1705 if (type->type == MONO_TYPE_VOID) {
1706 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid use of void type for %s at 0x%04x", opcode, ctx->ip_offset));
1707 return NULL;
1708 }
1709
1710 if (type->type == MONO_TYPE_TYPEDBYREF)
1711 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid use of typedbyref for %s at 0x%04x", opcode, ctx->ip_offset));
1712
1713 if (!(klass = mono_class_from_mono_type (type)))
1714 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Could not retrieve type token for %s at 0x%04x", opcode, ctx->ip_offset));
1715
1716 if (mono_class_is_gtd (klass) && type->type != MONO_TYPE_GENERICINST)
1717 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use the generic type definition in a boxable type position for %s at 0x%04x", opcode, ctx->ip_offset));
1718
1719 check_unverifiable_type (ctx, type);
1720 return type;
1721 }
1722
1723
1724 /*operation result tables */
1725
1726 static const unsigned char bin_op_table [TYPE_MAX][TYPE_MAX] = {
1727 {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1728 {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1729 {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1730 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_R8, TYPE_INV, TYPE_INV},
1731 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1732 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1733 };
1734
1735 static const unsigned char add_table [TYPE_MAX][TYPE_MAX] = {
1736 {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV},
1737 {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1738 {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV},
1739 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_R8, TYPE_INV, TYPE_INV},
1740 {TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_INV, TYPE_INV},
1741 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1742 };
1743
1744 static const unsigned char sub_table [TYPE_MAX][TYPE_MAX] = {
1745 {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1746 {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1747 {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1748 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_R8, TYPE_INV, TYPE_INV},
1749 {TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_NATIVE_INT | NON_VERIFIABLE_RESULT, TYPE_INV},
1750 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1751 };
1752
1753 static const unsigned char int_bin_op_table [TYPE_MAX][TYPE_MAX] = {
1754 {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1755 {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1756 {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1757 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1758 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1759 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1760 };
1761
1762 static const unsigned char shift_op_table [TYPE_MAX][TYPE_MAX] = {
1763 {TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV},
1764 {TYPE_I8, TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV},
1765 {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1766 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1767 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1768 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1769 };
1770
1771 static const unsigned char cmp_br_op [TYPE_MAX][TYPE_MAX] = {
1772 {TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV},
1773 {TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1774 {TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV},
1775 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV},
1776 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_I4, TYPE_INV},
1777 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1778 };
1779
1780 static const unsigned char cmp_br_eq_op [TYPE_MAX][TYPE_MAX] = {
1781 {TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV},
1782 {TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1783 {TYPE_I4, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_I4 | NON_VERIFIABLE_RESULT, TYPE_INV},
1784 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_I4, TYPE_INV, TYPE_INV},
1785 {TYPE_INV, TYPE_INV, TYPE_I4 | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_I4, TYPE_INV},
1786 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_I4},
1787 };
1788
1789 static const unsigned char add_ovf_un_table [TYPE_MAX][TYPE_MAX] = {
1790 {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV},
1791 {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1792 {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV},
1793 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1794 {TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_INV, TYPE_INV},
1795 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1796 };
1797
1798 static const unsigned char sub_ovf_un_table [TYPE_MAX][TYPE_MAX] = {
1799 {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1800 {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1801 {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1802 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1803 {TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_PTR | NON_VERIFIABLE_RESULT, TYPE_INV, TYPE_NATIVE_INT | NON_VERIFIABLE_RESULT, TYPE_INV},
1804 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1805 };
1806
1807 static const unsigned char bin_ovf_table [TYPE_MAX][TYPE_MAX] = {
1808 {TYPE_I4, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1809 {TYPE_INV, TYPE_I8, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1810 {TYPE_NATIVE_INT, TYPE_INV, TYPE_NATIVE_INT, TYPE_INV, TYPE_INV, TYPE_INV},
1811 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1812 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1813 {TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV, TYPE_INV},
1814 };
1815
1816 #ifdef MONO_VERIFIER_DEBUG
1817
1818 /*debug helpers */
1819 static void
dump_stack_value(ILStackDesc * value)1820 dump_stack_value (ILStackDesc *value)
1821 {
1822 printf ("[(%x)(%x)", value->type->type, value->stype);
1823
1824 if (stack_slot_is_this_pointer (value))
1825 printf ("[this] ");
1826
1827 if (stack_slot_is_boxed_value (value))
1828 printf ("[boxed] ");
1829
1830 if (stack_slot_is_null_literal (value))
1831 printf ("[null] ");
1832
1833 if (stack_slot_is_managed_mutability_pointer (value))
1834 printf ("Controled Mutability MP: ");
1835
1836 if (stack_slot_is_managed_pointer (value))
1837 printf ("Managed Pointer to: ");
1838
1839 if (stack_slot_is_safe_byref (value))
1840 printf ("Safe ByRef to: ");
1841
1842 switch (stack_slot_get_underlying_type (value)) {
1843 case TYPE_INV:
1844 printf ("invalid type]");
1845 return;
1846 case TYPE_I4:
1847 printf ("int32]");
1848 return;
1849 case TYPE_I8:
1850 printf ("int64]");
1851 return;
1852 case TYPE_NATIVE_INT:
1853 printf ("native int]");
1854 return;
1855 case TYPE_R8:
1856 printf ("float64]");
1857 return;
1858 case TYPE_PTR:
1859 printf ("unmanaged pointer]");
1860 return;
1861 case TYPE_COMPLEX:
1862 switch (value->type->type) {
1863 case MONO_TYPE_CLASS:
1864 case MONO_TYPE_VALUETYPE:
1865 printf ("complex] (%s)", value->type->data.klass->name);
1866 return;
1867 case MONO_TYPE_STRING:
1868 printf ("complex] (string)");
1869 return;
1870 case MONO_TYPE_OBJECT:
1871 printf ("complex] (object)");
1872 return;
1873 case MONO_TYPE_SZARRAY:
1874 printf ("complex] (%s [])", value->type->data.klass->name);
1875 return;
1876 case MONO_TYPE_ARRAY:
1877 printf ("complex] (%s [%d %d %d])",
1878 value->type->data.array->eklass->name,
1879 value->type->data.array->rank,
1880 value->type->data.array->numsizes,
1881 value->type->data.array->numlobounds);
1882 return;
1883 case MONO_TYPE_GENERICINST:
1884 printf ("complex] (inst of %s )", value->type->data.generic_class->container_class->name);
1885 return;
1886 case MONO_TYPE_VAR:
1887 printf ("complex] (type generic param !%d - %s) ", value->type->data.generic_param->num, mono_generic_param_info (value->type->data.generic_param)->name);
1888 return;
1889 case MONO_TYPE_MVAR:
1890 printf ("complex] (method generic param !!%d - %s) ", value->type->data.generic_param->num, mono_generic_param_info (value->type->data.generic_param)->name);
1891 return;
1892 default: {
1893 //should be a boxed value
1894 char * name = mono_type_full_name (value->type);
1895 printf ("complex] %s", name);
1896 g_free (name);
1897 return;
1898 }
1899 }
1900 default:
1901 printf ("unknown stack %x type]\n", value->stype);
1902 g_assert_not_reached ();
1903 }
1904 }
1905
1906 static void
dump_stack_state(ILCodeDesc * state)1907 dump_stack_state (ILCodeDesc *state)
1908 {
1909 int i;
1910
1911 printf ("(%d) ", state->size);
1912 for (i = 0; i < state->size; ++i)
1913 dump_stack_value (state->stack + i);
1914 printf ("\n");
1915 }
1916 #endif
1917
1918 /**
1919 * is_array_type_compatible:
1920 *
1921 * Returns TRUE if candidate array type can be assigned to target.
1922 *
1923 * Both parameters MUST be of type MONO_TYPE_ARRAY (target->type == MONO_TYPE_ARRAY)
1924 */
1925 static gboolean
is_array_type_compatible(MonoType * target,MonoType * candidate)1926 is_array_type_compatible (MonoType *target, MonoType *candidate)
1927 {
1928 MonoArrayType *left = target->data.array;
1929 MonoArrayType *right = candidate->data.array;
1930
1931 g_assert (target->type == MONO_TYPE_ARRAY);
1932 g_assert (candidate->type == MONO_TYPE_ARRAY);
1933
1934 if (left->rank != right->rank)
1935 return FALSE;
1936
1937 return verifier_class_is_assignable_from (left->eklass, right->eklass);
1938 }
1939
1940 static int
get_stack_type(MonoType * type)1941 get_stack_type (MonoType *type)
1942 {
1943 int mask = 0;
1944 int type_kind = type->type;
1945 if (type->byref)
1946 mask = POINTER_MASK;
1947 /*TODO handle CMMP_MASK */
1948
1949 handle_enum:
1950 switch (type_kind) {
1951 case MONO_TYPE_I1:
1952 case MONO_TYPE_U1:
1953 case MONO_TYPE_BOOLEAN:
1954 case MONO_TYPE_I2:
1955 case MONO_TYPE_U2:
1956 case MONO_TYPE_CHAR:
1957 case MONO_TYPE_I4:
1958 case MONO_TYPE_U4:
1959 return TYPE_I4 | mask;
1960
1961 case MONO_TYPE_I:
1962 case MONO_TYPE_U:
1963 return TYPE_NATIVE_INT | mask;
1964
1965 /* FIXME: the spec says that you cannot have a pointer to method pointer, do we need to check this here? */
1966 case MONO_TYPE_FNPTR:
1967 case MONO_TYPE_PTR:
1968 case MONO_TYPE_TYPEDBYREF:
1969 return TYPE_PTR | mask;
1970
1971 case MONO_TYPE_VAR:
1972 case MONO_TYPE_MVAR:
1973
1974 case MONO_TYPE_CLASS:
1975 case MONO_TYPE_STRING:
1976 case MONO_TYPE_OBJECT:
1977 case MONO_TYPE_SZARRAY:
1978 case MONO_TYPE_ARRAY:
1979 return TYPE_COMPLEX | mask;
1980
1981 case MONO_TYPE_I8:
1982 case MONO_TYPE_U8:
1983 return TYPE_I8 | mask;
1984
1985 case MONO_TYPE_R4:
1986 case MONO_TYPE_R8:
1987 return TYPE_R8 | mask;
1988
1989 case MONO_TYPE_GENERICINST:
1990 case MONO_TYPE_VALUETYPE:
1991 if (mono_type_is_enum_type (type)) {
1992 type = mono_type_get_underlying_type_any (type);
1993 if (!type)
1994 return FALSE;
1995 type_kind = type->type;
1996 goto handle_enum;
1997 } else {
1998 return TYPE_COMPLEX | mask;
1999 }
2000
2001 default:
2002 return TYPE_INV;
2003 }
2004 }
2005
2006 /* convert MonoType to ILStackDesc format (stype) */
2007 static gboolean
set_stack_value(VerifyContext * ctx,ILStackDesc * stack,MonoType * type,int take_addr)2008 set_stack_value (VerifyContext *ctx, ILStackDesc *stack, MonoType *type, int take_addr)
2009 {
2010 int mask = 0;
2011 int type_kind = type->type;
2012
2013 if (type->byref || take_addr)
2014 mask = POINTER_MASK;
2015 /* TODO handle CMMP_MASK */
2016
2017 handle_enum:
2018 stack->type = type;
2019
2020 switch (type_kind) {
2021 case MONO_TYPE_I1:
2022 case MONO_TYPE_U1:
2023 case MONO_TYPE_BOOLEAN:
2024 case MONO_TYPE_I2:
2025 case MONO_TYPE_U2:
2026 case MONO_TYPE_CHAR:
2027 case MONO_TYPE_I4:
2028 case MONO_TYPE_U4:
2029 stack->stype = TYPE_I4 | mask;
2030 break;
2031 case MONO_TYPE_I:
2032 case MONO_TYPE_U:
2033 stack->stype = TYPE_NATIVE_INT | mask;
2034 break;
2035
2036 /*FIXME: Do we need to check if it's a pointer to the method pointer? The spec says it' illegal to have that.*/
2037 case MONO_TYPE_FNPTR:
2038 case MONO_TYPE_PTR:
2039 case MONO_TYPE_TYPEDBYREF:
2040 stack->stype = TYPE_PTR | mask;
2041 break;
2042
2043 case MONO_TYPE_CLASS:
2044 case MONO_TYPE_STRING:
2045 case MONO_TYPE_OBJECT:
2046 case MONO_TYPE_SZARRAY:
2047 case MONO_TYPE_ARRAY:
2048
2049 case MONO_TYPE_VAR:
2050 case MONO_TYPE_MVAR:
2051 stack->stype = TYPE_COMPLEX | mask;
2052 break;
2053
2054 case MONO_TYPE_I8:
2055 case MONO_TYPE_U8:
2056 stack->stype = TYPE_I8 | mask;
2057 break;
2058 case MONO_TYPE_R4:
2059 case MONO_TYPE_R8:
2060 stack->stype = TYPE_R8 | mask;
2061 break;
2062 case MONO_TYPE_GENERICINST:
2063 case MONO_TYPE_VALUETYPE:
2064 if (mono_type_is_enum_type (type)) {
2065 MonoType *utype = mono_type_get_underlying_type_any (type);
2066 if (!utype) {
2067 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Could not resolve underlying type of %x at %d", type->type, ctx->ip_offset));
2068 return FALSE;
2069 }
2070 type = utype;
2071 type_kind = type->type;
2072 goto handle_enum;
2073 } else {
2074 stack->stype = TYPE_COMPLEX | mask;
2075 break;
2076 }
2077 default:
2078 VERIFIER_DEBUG ( printf ("unknown type 0x%02x in eval stack type\n", type->type); );
2079 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Illegal value set on stack 0x%02x at %d", type->type, ctx->ip_offset));
2080 return FALSE;
2081 }
2082 return TRUE;
2083 }
2084
2085 /*
2086 * init_stack_with_value_at_exception_boundary:
2087 *
2088 * Initialize the stack and push a given type.
2089 * The instruction is marked as been on the exception boundary.
2090 */
2091 static void
init_stack_with_value_at_exception_boundary(VerifyContext * ctx,ILCodeDesc * code,MonoClass * klass)2092 init_stack_with_value_at_exception_boundary (VerifyContext *ctx, ILCodeDesc *code, MonoClass *klass)
2093 {
2094 MonoError error;
2095 MonoType *type = mono_class_inflate_generic_type_checked (&klass->byval_arg, ctx->generic_context, &error);
2096
2097 if (!mono_error_ok (&error)) {
2098 char *name = mono_type_get_full_name (klass);
2099 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid class %s used for exception", name));
2100 g_free (name);
2101 mono_error_cleanup (&error);
2102 return;
2103 }
2104
2105 if (!ctx->max_stack) {
2106 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Stack overflow at 0x%04x", ctx->ip_offset));
2107 return;
2108 }
2109
2110 stack_init (ctx, code);
2111 ensure_stack_size (code, 1);
2112 set_stack_value (ctx, code->stack, type, FALSE);
2113 ctx->exception_types = g_slist_prepend (ctx->exception_types, type);
2114 code->size = 1;
2115 code->flags |= IL_CODE_FLAG_WAS_TARGET;
2116 if (mono_type_is_generic_argument (type))
2117 code->stack->stype |= BOXED_MASK;
2118 }
2119 /* Class lazy loading functions */
2120 static GENERATE_GET_CLASS_WITH_CACHE (ienumerable, "System.Collections.Generic", "IEnumerable`1")
2121 static GENERATE_GET_CLASS_WITH_CACHE (icollection, "System.Collections.Generic", "ICollection`1")
2122 static GENERATE_GET_CLASS_WITH_CACHE (ireadonly_list, "System.Collections.Generic", "IReadOnlyList`1")
2123 static GENERATE_GET_CLASS_WITH_CACHE (ireadonly_collection, "System.Collections.Generic", "IReadOnlyCollection`1")
2124
2125
2126 static MonoClass*
get_ienumerable_class(void)2127 get_ienumerable_class (void)
2128 {
2129 return mono_class_get_ienumerable_class ();
2130 }
2131
2132 static MonoClass*
get_icollection_class(void)2133 get_icollection_class (void)
2134 {
2135 return mono_class_get_icollection_class ();
2136 }
2137
2138 static MonoClass*
get_ireadonlylist_class(void)2139 get_ireadonlylist_class (void)
2140 {
2141 return mono_class_get_ireadonly_list_class ();
2142 }
2143
2144 static MonoClass*
get_ireadonlycollection_class(void)2145 get_ireadonlycollection_class (void)
2146 {
2147 return mono_class_get_ireadonly_collection_class ();
2148 }
2149
2150 static MonoClass*
inflate_class_one_arg(MonoClass * gtype,MonoClass * arg0)2151 inflate_class_one_arg (MonoClass *gtype, MonoClass *arg0)
2152 {
2153 MonoType *args [1];
2154 args [0] = &arg0->byval_arg;
2155
2156 return mono_class_bind_generic_parameters (gtype, 1, args, FALSE);
2157 }
2158
2159 static gboolean
verifier_inflate_and_check_compat(MonoClass * target,MonoClass * gtd,MonoClass * arg)2160 verifier_inflate_and_check_compat (MonoClass *target, MonoClass *gtd, MonoClass *arg)
2161 {
2162 MonoClass *tmp;
2163 if (!(tmp = inflate_class_one_arg (gtd, arg)))
2164 return FALSE;
2165 if (mono_class_is_variant_compatible (target, tmp, TRUE))
2166 return TRUE;
2167 return FALSE;
2168 }
2169
2170 static gboolean
verifier_class_is_assignable_from(MonoClass * target,MonoClass * candidate)2171 verifier_class_is_assignable_from (MonoClass *target, MonoClass *candidate)
2172 {
2173 MonoClass *iface_gtd;
2174
2175 if (target == candidate)
2176 return TRUE;
2177
2178 if (mono_class_has_variant_generic_params (target)) {
2179 if (MONO_CLASS_IS_INTERFACE (target)) {
2180 if (MONO_CLASS_IS_INTERFACE (candidate) && mono_class_is_variant_compatible (target, candidate, TRUE))
2181 return TRUE;
2182
2183 if (candidate->rank == 1) {
2184 if (verifier_inflate_and_check_compat (target, mono_defaults.generic_ilist_class, candidate->element_class))
2185 return TRUE;
2186 if (verifier_inflate_and_check_compat (target, get_icollection_class (), candidate->element_class))
2187 return TRUE;
2188 if (verifier_inflate_and_check_compat (target, get_ienumerable_class (), candidate->element_class))
2189 return TRUE;
2190 if (verifier_inflate_and_check_compat (target, get_ireadonlylist_class (), candidate->element_class))
2191 return TRUE;
2192 if (verifier_inflate_and_check_compat (target, get_ireadonlycollection_class (), candidate->element_class))
2193 return TRUE;
2194 } else {
2195 MonoError error;
2196 int i;
2197 while (candidate && candidate != mono_defaults.object_class) {
2198 mono_class_setup_interfaces (candidate, &error);
2199 if (!mono_error_ok (&error)) {
2200 mono_error_cleanup (&error);
2201 return FALSE;
2202 }
2203
2204 /*klass is a generic variant interface, We need to extract from oklass a list of ifaces which are viable candidates.*/
2205 for (i = 0; i < candidate->interface_offsets_count; ++i) {
2206 MonoClass *iface = candidate->interfaces_packed [i];
2207 if (mono_class_is_variant_compatible (target, iface, TRUE))
2208 return TRUE;
2209 }
2210
2211 for (i = 0; i < candidate->interface_count; ++i) {
2212 MonoClass *iface = candidate->interfaces [i];
2213 if (mono_class_is_variant_compatible (target, iface, TRUE))
2214 return TRUE;
2215 }
2216 candidate = candidate->parent;
2217 }
2218 }
2219 } else if (target->delegate) {
2220 if (mono_class_is_variant_compatible (target, candidate, TRUE))
2221 return TRUE;
2222 }
2223 return FALSE;
2224 }
2225
2226 if (mono_class_is_assignable_from (target, candidate))
2227 return TRUE;
2228
2229 if (!MONO_CLASS_IS_INTERFACE (target) || !mono_class_is_ginst (target) || candidate->rank != 1)
2230 return FALSE;
2231
2232 iface_gtd = mono_class_get_generic_class (target)->container_class;
2233 if (iface_gtd != mono_defaults.generic_ilist_class && iface_gtd != get_icollection_class () && iface_gtd != get_ienumerable_class ())
2234 return FALSE;
2235
2236 target = mono_class_from_mono_type (mono_class_get_generic_class (target)->context.class_inst->type_argv [0]);
2237 candidate = candidate->element_class;
2238
2239 return TRUE;
2240 }
2241
2242 /*Verify if type 'candidate' can be stored in type 'target'.
2243 *
2244 * If strict, check for the underlying type and not the verification stack types
2245 */
2246 static gboolean
verify_type_compatibility_full(VerifyContext * ctx,MonoType * target,MonoType * candidate,gboolean strict)2247 verify_type_compatibility_full (VerifyContext *ctx, MonoType *target, MonoType *candidate, gboolean strict)
2248 {
2249 #define IS_ONE_OF3(T, A, B, C) (T == A || T == B || T == C)
2250 #define IS_ONE_OF2(T, A, B) (T == A || T == B)
2251
2252 MonoType *original_candidate = candidate;
2253 VERIFIER_DEBUG ( printf ("checking type compatibility %s x %s strict %d\n", mono_type_full_name (target), mono_type_full_name (candidate), strict); );
2254
2255 /*only one is byref */
2256 if (candidate->byref ^ target->byref) {
2257 /* converting from native int to byref*/
2258 if (get_stack_type (candidate) == TYPE_NATIVE_INT && target->byref) {
2259 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("using byref native int at 0x%04x", ctx->ip_offset));
2260 return TRUE;
2261 }
2262 return FALSE;
2263 }
2264 strict |= target->byref;
2265 /*From now on we don't care about byref anymore, so it's ok to discard it here*/
2266 candidate = mono_type_get_underlying_type_any (candidate);
2267
2268 handle_enum:
2269 switch (target->type) {
2270 case MONO_TYPE_VOID:
2271 return candidate->type == MONO_TYPE_VOID;
2272 case MONO_TYPE_I1:
2273 case MONO_TYPE_U1:
2274 case MONO_TYPE_BOOLEAN:
2275 if (strict)
2276 return IS_ONE_OF3 (candidate->type, MONO_TYPE_I1, MONO_TYPE_U1, MONO_TYPE_BOOLEAN);
2277 case MONO_TYPE_I2:
2278 case MONO_TYPE_U2:
2279 case MONO_TYPE_CHAR:
2280 if (strict)
2281 return IS_ONE_OF3 (candidate->type, MONO_TYPE_I2, MONO_TYPE_U2, MONO_TYPE_CHAR);
2282 case MONO_TYPE_I4:
2283 case MONO_TYPE_U4: {
2284 gboolean is_native_int = IS_ONE_OF2 (candidate->type, MONO_TYPE_I, MONO_TYPE_U);
2285 gboolean is_int4 = IS_ONE_OF2 (candidate->type, MONO_TYPE_I4, MONO_TYPE_U4);
2286 if (strict)
2287 return is_native_int || is_int4;
2288 return is_native_int || get_stack_type (candidate) == TYPE_I4;
2289 }
2290
2291 case MONO_TYPE_I8:
2292 case MONO_TYPE_U8:
2293 return IS_ONE_OF2 (candidate->type, MONO_TYPE_I8, MONO_TYPE_U8);
2294
2295 case MONO_TYPE_R4:
2296 case MONO_TYPE_R8:
2297 if (strict)
2298 return candidate->type == target->type;
2299 return IS_ONE_OF2 (candidate->type, MONO_TYPE_R4, MONO_TYPE_R8);
2300
2301 case MONO_TYPE_I:
2302 case MONO_TYPE_U: {
2303 gboolean is_native_int = IS_ONE_OF2 (candidate->type, MONO_TYPE_I, MONO_TYPE_U);
2304 gboolean is_int4 = IS_ONE_OF2 (candidate->type, MONO_TYPE_I4, MONO_TYPE_U4);
2305 if (strict)
2306 return is_native_int || is_int4;
2307 return is_native_int || get_stack_type (candidate) == TYPE_I4;
2308 }
2309
2310 case MONO_TYPE_PTR:
2311 if (candidate->type != MONO_TYPE_PTR)
2312 return FALSE;
2313 /* check the underlying type */
2314 return verify_type_compatibility_full (ctx, target->data.type, candidate->data.type, TRUE);
2315
2316 case MONO_TYPE_FNPTR: {
2317 MonoMethodSignature *left, *right;
2318 if (candidate->type != MONO_TYPE_FNPTR)
2319 return FALSE;
2320
2321 left = mono_type_get_signature (target);
2322 right = mono_type_get_signature (candidate);
2323 return mono_metadata_signature_equal (left, right) && left->call_convention == right->call_convention;
2324 }
2325
2326 case MONO_TYPE_GENERICINST: {
2327 MonoClass *target_klass;
2328 MonoClass *candidate_klass;
2329 if (mono_type_is_enum_type (target)) {
2330 target = mono_type_get_underlying_type_any (target);
2331 if (!target)
2332 return FALSE;
2333 goto handle_enum;
2334 }
2335 /*
2336 * VAR / MVAR compatibility must be checked by verify_stack_type_compatibility
2337 * to take boxing status into account.
2338 */
2339 if (mono_type_is_generic_argument (original_candidate))
2340 return FALSE;
2341
2342 target_klass = mono_class_from_mono_type (target);
2343 candidate_klass = mono_class_from_mono_type (candidate);
2344 if (mono_class_is_nullable (target_klass)) {
2345 if (!mono_class_is_nullable (candidate_klass))
2346 return FALSE;
2347 return target_klass == candidate_klass;
2348 }
2349 return verifier_class_is_assignable_from (target_klass, candidate_klass);
2350 }
2351
2352 case MONO_TYPE_STRING:
2353 return candidate->type == MONO_TYPE_STRING;
2354
2355 case MONO_TYPE_CLASS:
2356 /*
2357 * VAR / MVAR compatibility must be checked by verify_stack_type_compatibility
2358 * to take boxing status into account.
2359 */
2360 if (mono_type_is_generic_argument (original_candidate))
2361 return FALSE;
2362
2363 if (candidate->type == MONO_TYPE_VALUETYPE)
2364 return FALSE;
2365
2366 /* If candidate is an enum it should return true for System.Enum and supertypes.
2367 * That's why here we use the original type and not the underlying type.
2368 */
2369 return verifier_class_is_assignable_from (target->data.klass, mono_class_from_mono_type (original_candidate));
2370
2371 case MONO_TYPE_OBJECT:
2372 return MONO_TYPE_IS_REFERENCE (candidate);
2373
2374 case MONO_TYPE_SZARRAY: {
2375 MonoClass *left;
2376 MonoClass *right;
2377 if (candidate->type != MONO_TYPE_SZARRAY)
2378 return FALSE;
2379
2380 left = mono_class_from_mono_type (target);
2381 right = mono_class_from_mono_type (candidate);
2382
2383 return verifier_class_is_assignable_from (left, right);
2384 }
2385
2386 case MONO_TYPE_ARRAY:
2387 if (candidate->type != MONO_TYPE_ARRAY)
2388 return FALSE;
2389 return is_array_type_compatible (target, candidate);
2390
2391 case MONO_TYPE_TYPEDBYREF:
2392 return candidate->type == MONO_TYPE_TYPEDBYREF;
2393
2394 case MONO_TYPE_VALUETYPE: {
2395 MonoClass *target_klass;
2396 MonoClass *candidate_klass;
2397
2398 if (candidate->type == MONO_TYPE_CLASS)
2399 return FALSE;
2400
2401 target_klass = mono_class_from_mono_type (target);
2402 candidate_klass = mono_class_from_mono_type (candidate);
2403 if (target_klass == candidate_klass)
2404 return TRUE;
2405 if (mono_type_is_enum_type (target)) {
2406 target = mono_type_get_underlying_type_any (target);
2407 if (!target)
2408 return FALSE;
2409 goto handle_enum;
2410 }
2411 return FALSE;
2412 }
2413
2414 case MONO_TYPE_VAR:
2415 if (candidate->type != MONO_TYPE_VAR)
2416 return FALSE;
2417 return mono_type_get_generic_param_num (candidate) == mono_type_get_generic_param_num (target);
2418
2419 case MONO_TYPE_MVAR:
2420 if (candidate->type != MONO_TYPE_MVAR)
2421 return FALSE;
2422 return mono_type_get_generic_param_num (candidate) == mono_type_get_generic_param_num (target);
2423
2424 default:
2425 VERIFIER_DEBUG ( printf ("unknown store type %d\n", target->type); );
2426 g_assert_not_reached ();
2427 return FALSE;
2428 }
2429 return 1;
2430 #undef IS_ONE_OF3
2431 #undef IS_ONE_OF2
2432 }
2433
2434 static gboolean
verify_type_compatibility(VerifyContext * ctx,MonoType * target,MonoType * candidate)2435 verify_type_compatibility (VerifyContext *ctx, MonoType *target, MonoType *candidate)
2436 {
2437 return verify_type_compatibility_full (ctx, target, candidate, FALSE);
2438 }
2439
2440 /*
2441 * Returns the generic param bound to the context been verified.
2442 *
2443 */
2444 static MonoGenericParam*
get_generic_param(VerifyContext * ctx,MonoType * param)2445 get_generic_param (VerifyContext *ctx, MonoType *param)
2446 {
2447 guint16 param_num = mono_type_get_generic_param_num (param);
2448 if (param->type == MONO_TYPE_VAR) {
2449 if (!ctx->generic_context->class_inst || ctx->generic_context->class_inst->type_argc <= param_num) {
2450 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid generic type argument %d", param_num));
2451 return NULL;
2452 }
2453 return ctx->generic_context->class_inst->type_argv [param_num]->data.generic_param;
2454 }
2455
2456 /*param must be a MVAR */
2457 if (!ctx->generic_context->method_inst || ctx->generic_context->method_inst->type_argc <= param_num) {
2458 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid generic method argument %d", param_num));
2459 return NULL;
2460 }
2461 return ctx->generic_context->method_inst->type_argv [param_num]->data.generic_param;
2462
2463 }
2464
2465 static gboolean
recursive_boxed_constraint_type_check(VerifyContext * ctx,MonoType * type,MonoClass * constraint_class,int recursion_level)2466 recursive_boxed_constraint_type_check (VerifyContext *ctx, MonoType *type, MonoClass *constraint_class, int recursion_level)
2467 {
2468 MonoType *constraint_type = &constraint_class->byval_arg;
2469 if (recursion_level <= 0)
2470 return FALSE;
2471
2472 if (verify_type_compatibility_full (ctx, type, mono_type_get_type_byval (constraint_type), FALSE))
2473 return TRUE;
2474
2475 if (mono_type_is_generic_argument (constraint_type)) {
2476 MonoGenericParam *param = get_generic_param (ctx, constraint_type);
2477 MonoClass **klass;
2478 if (!param)
2479 return FALSE;
2480 for (klass = mono_generic_param_info (param)->constraints; klass && *klass; ++klass) {
2481 if (recursive_boxed_constraint_type_check (ctx, type, *klass, recursion_level - 1))
2482 return TRUE;
2483 }
2484 }
2485 return FALSE;
2486 }
2487
2488 /**
2489 * is_compatible_boxed_valuetype:
2490 *
2491 * Returns: TRUE if @candidate / @stack is a valid boxed valuetype.
2492 *
2493 * @type The source type. It it tested to be of the proper type.
2494 * @candidate type of the boxed valuetype.
2495 * @stack stack slot of the boxed valuetype, separate from @candidade since one could be changed before calling this function
2496 * @strict if TRUE candidate must be boxed compatible to the target type
2497 *
2498 */
2499 static gboolean
is_compatible_boxed_valuetype(VerifyContext * ctx,MonoType * type,MonoType * candidate,ILStackDesc * stack,gboolean strict)2500 is_compatible_boxed_valuetype (VerifyContext *ctx, MonoType *type, MonoType *candidate, ILStackDesc *stack, gboolean strict)
2501 {
2502 if (!stack_slot_is_boxed_value (stack))
2503 return FALSE;
2504 if (type->byref || candidate->byref)
2505 return FALSE;
2506
2507 if (mono_type_is_generic_argument (candidate)) {
2508 MonoGenericParam *param = get_generic_param (ctx, candidate);
2509 MonoClass **klass;
2510 if (!param)
2511 return FALSE;
2512
2513 for (klass = mono_generic_param_info (param)->constraints; klass && *klass; ++klass) {
2514 /*256 should be enough since there can't be more than 255 generic arguments.*/
2515 if (recursive_boxed_constraint_type_check (ctx, type, *klass, 256))
2516 return TRUE;
2517 }
2518 }
2519
2520 if (mono_type_is_generic_argument (type))
2521 return FALSE;
2522
2523 if (!strict)
2524 return TRUE;
2525
2526 return MONO_TYPE_IS_REFERENCE (type) && verifier_class_is_assignable_from (mono_class_from_mono_type (type), mono_class_from_mono_type (candidate));
2527 }
2528
2529 static int
verify_stack_type_compatibility_full(VerifyContext * ctx,MonoType * type,ILStackDesc * stack,gboolean drop_byref,gboolean valuetype_must_be_boxed)2530 verify_stack_type_compatibility_full (VerifyContext *ctx, MonoType *type, ILStackDesc *stack, gboolean drop_byref, gboolean valuetype_must_be_boxed)
2531 {
2532 MonoType *candidate = mono_type_from_stack_slot (stack);
2533 if (MONO_TYPE_IS_REFERENCE (type) && !type->byref && stack_slot_is_null_literal (stack))
2534 return TRUE;
2535
2536 if (is_compatible_boxed_valuetype (ctx, type, candidate, stack, TRUE))
2537 return TRUE;
2538
2539 if (valuetype_must_be_boxed && !stack_slot_is_boxed_value (stack) && !MONO_TYPE_IS_REFERENCE (candidate))
2540 return FALSE;
2541
2542 if (!valuetype_must_be_boxed && stack_slot_is_boxed_value (stack))
2543 return FALSE;
2544
2545 if (drop_byref)
2546 return verify_type_compatibility_full (ctx, type, mono_type_get_type_byval (candidate), FALSE);
2547
2548 /* Handle how Roslyn emit fixed statements by encoding it as byref */
2549 if (type->byref && candidate->byref && (type->type == MONO_TYPE_I) && !mono_type_is_reference (candidate)) {
2550 if (!IS_STRICT_MODE (ctx))
2551 return TRUE;
2552 }
2553
2554 return verify_type_compatibility_full (ctx, type, candidate, FALSE);
2555 }
2556
2557 static int
verify_stack_type_compatibility(VerifyContext * ctx,MonoType * type,ILStackDesc * stack)2558 verify_stack_type_compatibility (VerifyContext *ctx, MonoType *type, ILStackDesc *stack)
2559 {
2560 return verify_stack_type_compatibility_full (ctx, type, stack, FALSE, FALSE);
2561 }
2562
2563 static gboolean
mono_delegate_type_equal(MonoType * target,MonoType * candidate)2564 mono_delegate_type_equal (MonoType *target, MonoType *candidate)
2565 {
2566 if (candidate->byref ^ target->byref)
2567 return FALSE;
2568
2569 switch (target->type) {
2570 case MONO_TYPE_VOID:
2571 case MONO_TYPE_I1:
2572 case MONO_TYPE_U1:
2573 case MONO_TYPE_BOOLEAN:
2574 case MONO_TYPE_I2:
2575 case MONO_TYPE_U2:
2576 case MONO_TYPE_CHAR:
2577 case MONO_TYPE_I4:
2578 case MONO_TYPE_U4:
2579 case MONO_TYPE_I8:
2580 case MONO_TYPE_U8:
2581 case MONO_TYPE_R4:
2582 case MONO_TYPE_R8:
2583 case MONO_TYPE_I:
2584 case MONO_TYPE_U:
2585 case MONO_TYPE_STRING:
2586 case MONO_TYPE_TYPEDBYREF:
2587 return candidate->type == target->type;
2588
2589 case MONO_TYPE_PTR:
2590 if (candidate->type != MONO_TYPE_PTR)
2591 return FALSE;
2592 return mono_delegate_type_equal (target->data.type, candidate->data.type);
2593
2594 case MONO_TYPE_FNPTR:
2595 if (candidate->type != MONO_TYPE_FNPTR)
2596 return FALSE;
2597 return mono_delegate_signature_equal (mono_type_get_signature (target), mono_type_get_signature (candidate), FALSE);
2598
2599 case MONO_TYPE_GENERICINST: {
2600 MonoClass *target_klass;
2601 MonoClass *candidate_klass;
2602 target_klass = mono_class_from_mono_type (target);
2603 candidate_klass = mono_class_from_mono_type (candidate);
2604 /*FIXME handle nullables and enum*/
2605 return verifier_class_is_assignable_from (target_klass, candidate_klass);
2606 }
2607 case MONO_TYPE_OBJECT:
2608 return MONO_TYPE_IS_REFERENCE (candidate);
2609
2610 case MONO_TYPE_CLASS:
2611 return verifier_class_is_assignable_from(target->data.klass, mono_class_from_mono_type (candidate));
2612
2613 case MONO_TYPE_SZARRAY:
2614 if (candidate->type != MONO_TYPE_SZARRAY)
2615 return FALSE;
2616 return verifier_class_is_assignable_from (mono_class_from_mono_type (target)->element_class, mono_class_from_mono_type (candidate)->element_class);
2617
2618 case MONO_TYPE_ARRAY:
2619 if (candidate->type != MONO_TYPE_ARRAY)
2620 return FALSE;
2621 return is_array_type_compatible (target, candidate);
2622
2623 case MONO_TYPE_VALUETYPE:
2624 /*FIXME handle nullables and enum*/
2625 return mono_class_from_mono_type (candidate) == mono_class_from_mono_type (target);
2626
2627 case MONO_TYPE_VAR:
2628 return candidate->type == MONO_TYPE_VAR && mono_type_get_generic_param_num (target) == mono_type_get_generic_param_num (candidate);
2629 return FALSE;
2630
2631 case MONO_TYPE_MVAR:
2632 return candidate->type == MONO_TYPE_MVAR && mono_type_get_generic_param_num (target) == mono_type_get_generic_param_num (candidate);
2633 return FALSE;
2634
2635 default:
2636 VERIFIER_DEBUG ( printf ("Unknown type %d. Implement me!\n", target->type); );
2637 g_assert_not_reached ();
2638 return FALSE;
2639 }
2640 }
2641
2642 static gboolean
mono_delegate_param_equal(MonoType * delegate,MonoType * method)2643 mono_delegate_param_equal (MonoType *delegate, MonoType *method)
2644 {
2645 if (mono_metadata_type_equal_full (delegate, method, TRUE))
2646 return TRUE;
2647
2648 return mono_delegate_type_equal (method, delegate);
2649 }
2650
2651 static gboolean
mono_delegate_ret_equal(MonoType * delegate,MonoType * method)2652 mono_delegate_ret_equal (MonoType *delegate, MonoType *method)
2653 {
2654 if (mono_metadata_type_equal_full (delegate, method, TRUE))
2655 return TRUE;
2656
2657 return mono_delegate_type_equal (delegate, method);
2658 }
2659
2660 /*
2661 * mono_delegate_signature_equal:
2662 *
2663 * Compare two signatures in the way expected by delegates.
2664 *
2665 * This function only exists due to the fact that it should ignore the 'has_this' part of the signature.
2666 *
2667 * FIXME can this function be eliminated and proper metadata functionality be used?
2668 */
2669 static gboolean
mono_delegate_signature_equal(MonoMethodSignature * delegate_sig,MonoMethodSignature * method_sig,gboolean is_static_ldftn)2670 mono_delegate_signature_equal (MonoMethodSignature *delegate_sig, MonoMethodSignature *method_sig, gboolean is_static_ldftn)
2671 {
2672 int i;
2673 int method_offset = is_static_ldftn ? 1 : 0;
2674
2675 if (delegate_sig->param_count + method_offset != method_sig->param_count)
2676 return FALSE;
2677
2678 if (delegate_sig->call_convention != method_sig->call_convention)
2679 return FALSE;
2680
2681 for (i = 0; i < delegate_sig->param_count; i++) {
2682 MonoType *p1 = delegate_sig->params [i];
2683 MonoType *p2 = method_sig->params [i + method_offset];
2684
2685 if (!mono_delegate_param_equal (p1, p2))
2686 return FALSE;
2687 }
2688
2689 if (!mono_delegate_ret_equal (delegate_sig->ret, method_sig->ret))
2690 return FALSE;
2691
2692 return TRUE;
2693 }
2694
2695 gboolean
mono_verifier_is_signature_compatible(MonoMethodSignature * target,MonoMethodSignature * candidate)2696 mono_verifier_is_signature_compatible (MonoMethodSignature *target, MonoMethodSignature *candidate)
2697 {
2698 return mono_delegate_signature_equal (target, candidate, FALSE);
2699 }
2700
2701 /*
2702 * verify_ldftn_delegate:
2703 *
2704 * Verify properties of ldftn based delegates.
2705 */
2706 static void
verify_ldftn_delegate(VerifyContext * ctx,MonoClass * delegate,ILStackDesc * value,ILStackDesc * funptr)2707 verify_ldftn_delegate (VerifyContext *ctx, MonoClass *delegate, ILStackDesc *value, ILStackDesc *funptr)
2708 {
2709 MonoMethod *method = funptr->method;
2710
2711 /*ldftn non-final virtuals only allowed if method is not static,
2712 * the object is a this arg (comes from a ldarg.0), and there is no starg.0.
2713 * This rules doesn't apply if the object on stack is a boxed valuetype.
2714 */
2715 if ((method->flags & METHOD_ATTRIBUTE_VIRTUAL) && !(method->flags & METHOD_ATTRIBUTE_FINAL) && !mono_class_is_sealed (method->klass) && !stack_slot_is_boxed_value (value)) {
2716 /*A stdarg 0 must not happen, we fail here only in fail fast mode to avoid double error reports*/
2717 if (IS_FAIL_FAST_MODE (ctx) && ctx->has_this_store)
2718 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid ldftn with virtual function in method with stdarg 0 at 0x%04x", ctx->ip_offset));
2719
2720 /*current method must not be static*/
2721 if (ctx->method->flags & METHOD_ATTRIBUTE_STATIC)
2722 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid ldftn with virtual function at 0x%04x", ctx->ip_offset));
2723
2724 /*value is the this pointer, loaded using ldarg.0 */
2725 if (!stack_slot_is_this_pointer (value))
2726 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid object argument, it is not the this pointer, to ldftn with virtual method at 0x%04x", ctx->ip_offset));
2727
2728 ctx->code [ctx->ip_offset].flags |= IL_CODE_LDFTN_DELEGATE_NONFINAL_VIRTUAL;
2729 }
2730 }
2731
2732 /*
2733 * verify_delegate_compatibility:
2734 *
2735 * Verify delegate creation sequence.
2736 *
2737 */
2738 static void
verify_delegate_compatibility(VerifyContext * ctx,MonoClass * delegate,ILStackDesc * value,ILStackDesc * funptr)2739 verify_delegate_compatibility (VerifyContext *ctx, MonoClass *delegate, ILStackDesc *value, ILStackDesc *funptr)
2740 {
2741 #define IS_VALID_OPCODE(offset, opcode) (ip [ip_offset - offset] == opcode && (ctx->code [ip_offset - offset].flags & IL_CODE_FLAG_SEEN))
2742 #define IS_LOAD_FUN_PTR(kind) (IS_VALID_OPCODE (6, CEE_PREFIX1) && ip [ip_offset - 5] == kind)
2743
2744 MonoMethod *invoke, *method;
2745 const guint8 *ip = ctx->header->code;
2746 guint32 ip_offset = ctx->ip_offset;
2747 gboolean is_static_ldftn = FALSE, is_first_arg_bound = FALSE;
2748
2749 if (stack_slot_get_type (funptr) != TYPE_PTR || !funptr->method) {
2750 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid function pointer parameter for delegate constructor at 0x%04x", ctx->ip_offset));
2751 return;
2752 }
2753
2754 invoke = mono_get_delegate_invoke (delegate);
2755 method = funptr->method;
2756
2757 if (!method || !mono_method_signature (method)) {
2758 char *name = mono_type_get_full_name (delegate);
2759 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid method on stack to create delegate %s construction at 0x%04x", name, ctx->ip_offset));
2760 g_free (name);
2761 return;
2762 }
2763
2764 if (!invoke || !mono_method_signature (invoke)) {
2765 char *name = mono_type_get_full_name (delegate);
2766 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Delegate type %s with bad Invoke method at 0x%04x", name, ctx->ip_offset));
2767 g_free (name);
2768 return;
2769 }
2770
2771 is_static_ldftn = (ip_offset > 5 && IS_LOAD_FUN_PTR (CEE_LDFTN)) && method->flags & METHOD_ATTRIBUTE_STATIC;
2772
2773 if (is_static_ldftn)
2774 is_first_arg_bound = mono_method_signature (invoke)->param_count + 1 == mono_method_signature (method)->param_count;
2775
2776 if (!mono_delegate_signature_equal (mono_method_signature (invoke), mono_method_signature (method), is_first_arg_bound)) {
2777 char *fun_sig = mono_signature_get_desc (mono_method_signature (method), FALSE);
2778 char *invoke_sig = mono_signature_get_desc (mono_method_signature (invoke), FALSE);
2779 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Function pointer signature '%s' doesn't match delegate's signature '%s' at 0x%04x", fun_sig, invoke_sig, ctx->ip_offset));
2780 g_free (fun_sig);
2781 g_free (invoke_sig);
2782 }
2783
2784 /*
2785 * Delegate code sequences:
2786 * [-6] ldftn token
2787 * newobj ...
2788 *
2789 *
2790 * [-7] dup
2791 * [-6] ldvirtftn token
2792 * newobj ...
2793 *
2794 * ldftn sequence:*/
2795 if (ip_offset > 5 && IS_LOAD_FUN_PTR (CEE_LDFTN)) {
2796 verify_ldftn_delegate (ctx, delegate, value, funptr);
2797 } else if (ip_offset > 6 && IS_VALID_OPCODE (7, CEE_DUP) && IS_LOAD_FUN_PTR (CEE_LDVIRTFTN)) {
2798 ctx->code [ip_offset - 6].flags |= IL_CODE_DELEGATE_SEQUENCE;
2799 }else {
2800 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid code sequence for delegate creation at 0x%04x", ctx->ip_offset));
2801 }
2802 ctx->code [ip_offset].flags |= IL_CODE_DELEGATE_SEQUENCE;
2803
2804 //general tests
2805 if (is_first_arg_bound) {
2806 if (mono_method_signature (method)->param_count == 0 || !verify_stack_type_compatibility_full (ctx, mono_method_signature (method)->params [0], value, FALSE, TRUE))
2807 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("This object not compatible with function pointer for delegate creation at 0x%04x", ctx->ip_offset));
2808 } else {
2809 if (method->flags & METHOD_ATTRIBUTE_STATIC) {
2810 if (!stack_slot_is_null_literal (value))
2811 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Non-null this args used with static function for delegate creation at 0x%04x", ctx->ip_offset));
2812 } else {
2813 if (!verify_stack_type_compatibility_full (ctx, &method->klass->byval_arg, value, FALSE, TRUE) && !stack_slot_is_null_literal (value))
2814 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("This object not compatible with function pointer for delegate creation at 0x%04x", ctx->ip_offset));
2815 }
2816 }
2817
2818 if (stack_slot_get_type (value) != TYPE_COMPLEX)
2819 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid first parameter for delegate creation at 0x%04x", ctx->ip_offset));
2820
2821 #undef IS_VALID_OPCODE
2822 #undef IS_LOAD_FUN_PTR
2823 }
2824
2825 static gboolean
is_this_arg_of_struct_instance_method(unsigned int arg,VerifyContext * ctx)2826 is_this_arg_of_struct_instance_method (unsigned int arg, VerifyContext *ctx)
2827 {
2828 if (arg != 0)
2829 return FALSE;
2830 if (ctx->method->flags & METHOD_ATTRIBUTE_STATIC)
2831 return FALSE;
2832 if (!ctx->method->klass->valuetype)
2833 return FALSE;
2834 return TRUE;
2835 }
2836
2837 /* implement the opcode checks*/
2838 static void
push_arg(VerifyContext * ctx,unsigned int arg,int take_addr)2839 push_arg (VerifyContext *ctx, unsigned int arg, int take_addr)
2840 {
2841 ILStackDesc *top;
2842
2843 if (arg >= ctx->max_args) {
2844 if (take_addr)
2845 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method doesn't have argument %d", arg + 1));
2846 else {
2847 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Method doesn't have argument %d", arg + 1));
2848 if (check_overflow (ctx)) //FIXME: what sane value could we ever push?
2849 stack_push_val (ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
2850 }
2851 } else if (check_overflow (ctx)) {
2852 /*We must let the value be pushed, otherwise we would get an underflow error*/
2853 check_unverifiable_type (ctx, ctx->params [arg]);
2854 if (ctx->params [arg]->byref && take_addr)
2855 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("ByRef of ByRef at 0x%04x", ctx->ip_offset));
2856 top = stack_push (ctx);
2857 if (!set_stack_value (ctx, top, ctx->params [arg], take_addr))
2858 return;
2859
2860 if (arg == 0 && !(ctx->method->flags & METHOD_ATTRIBUTE_STATIC)) {
2861 if (take_addr)
2862 ctx->has_this_store = TRUE;
2863 else
2864 top->stype |= THIS_POINTER_MASK;
2865 if (mono_method_is_constructor (ctx->method) && !ctx->super_ctor_called && !ctx->method->klass->valuetype)
2866 top->stype |= UNINIT_THIS_MASK;
2867 }
2868 if (!take_addr && ctx->params [arg]->byref && !is_this_arg_of_struct_instance_method (arg, ctx))
2869 top->stype |= SAFE_BYREF_MASK;
2870 }
2871 }
2872
2873 static void
push_local(VerifyContext * ctx,guint32 arg,int take_addr)2874 push_local (VerifyContext *ctx, guint32 arg, int take_addr)
2875 {
2876 if (arg >= ctx->num_locals) {
2877 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method doesn't have local %d", arg + 1));
2878 } else if (check_overflow (ctx)) {
2879 /*We must let the value be pushed, otherwise we would get an underflow error*/
2880 check_unverifiable_type (ctx, ctx->locals [arg]);
2881 if (ctx->locals [arg]->byref && take_addr)
2882 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("ByRef of ByRef at 0x%04x", ctx->ip_offset));
2883
2884 ILStackDesc *value = stack_push (ctx);
2885 set_stack_value (ctx, value, ctx->locals [arg], take_addr);
2886 if (local_is_safe_byref (ctx, arg))
2887 value->stype |= SAFE_BYREF_MASK;
2888 }
2889 }
2890
2891 static void
store_arg(VerifyContext * ctx,guint32 arg)2892 store_arg (VerifyContext *ctx, guint32 arg)
2893 {
2894 ILStackDesc *value;
2895
2896 if (arg >= ctx->max_args) {
2897 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Method doesn't have argument %d at 0x%04x", arg + 1, ctx->ip_offset));
2898 if (check_underflow (ctx, 1))
2899 stack_pop (ctx);
2900 return;
2901 }
2902
2903 if (check_underflow (ctx, 1)) {
2904 value = stack_pop (ctx);
2905 if (!verify_stack_type_compatibility (ctx, ctx->params [arg], value)) {
2906 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible type %s in argument store at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
2907 }
2908 }
2909 if (arg == 0 && !(ctx->method->flags & METHOD_ATTRIBUTE_STATIC))
2910 ctx->has_this_store = 1;
2911 }
2912
2913 static void
store_local(VerifyContext * ctx,guint32 arg)2914 store_local (VerifyContext *ctx, guint32 arg)
2915 {
2916 ILStackDesc *value;
2917 if (arg >= ctx->num_locals) {
2918 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method doesn't have local var %d at 0x%04x", arg + 1, ctx->ip_offset));
2919 return;
2920 }
2921
2922 /*TODO verify definite assigment */
2923 if (!check_underflow (ctx, 1))
2924 return;
2925
2926 value = stack_pop (ctx);
2927 if (ctx->locals [arg]->byref) {
2928 if (stack_slot_is_managed_mutability_pointer (value))
2929 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly managed reference when storing on a local variable at 0x%04x", ctx->ip_offset));
2930
2931 if (local_is_safe_byref (ctx, arg) && !stack_slot_is_safe_byref (value))
2932 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot store an unsafe ret byref to a local that was previously stored a save ret byref value at 0x%04x", ctx->ip_offset));
2933
2934 if (stack_slot_is_safe_byref (value) && !local_is_unsafe_byref (ctx, arg))
2935 ctx->locals_verification_state [arg] |= SAFE_BYREF_LOCAL;
2936
2937 if (!stack_slot_is_safe_byref (value))
2938 ctx->locals_verification_state [arg] |= UNSAFE_BYREF_LOCAL;
2939
2940 }
2941 if (!verify_stack_type_compatibility (ctx, ctx->locals [arg], value)) {
2942 char *expected = mono_type_full_name (ctx->locals [arg]);
2943 char *found = stack_slot_full_name (value);
2944 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible type '%s' on stack cannot be stored to local %d with type '%s' at 0x%04x",
2945 found,
2946 arg,
2947 expected,
2948 ctx->ip_offset));
2949 g_free (expected);
2950 g_free (found);
2951 }
2952 }
2953
2954 /*FIXME add and sub needs special care here*/
2955 static void
do_binop(VerifyContext * ctx,unsigned int opcode,const unsigned char table[TYPE_MAX][TYPE_MAX])2956 do_binop (VerifyContext *ctx, unsigned int opcode, const unsigned char table [TYPE_MAX][TYPE_MAX])
2957 {
2958 ILStackDesc *a, *b, *top;
2959 int idxa, idxb, complexMerge = 0;
2960 unsigned char res;
2961
2962 if (!check_underflow (ctx, 2))
2963 return;
2964 b = stack_pop (ctx);
2965 a = stack_pop (ctx);
2966
2967 idxa = stack_slot_get_underlying_type (a);
2968 if (stack_slot_is_managed_pointer (a)) {
2969 idxa = TYPE_PTR;
2970 complexMerge = 1;
2971 }
2972
2973 idxb = stack_slot_get_underlying_type (b);
2974 if (stack_slot_is_managed_pointer (b)) {
2975 idxb = TYPE_PTR;
2976 complexMerge = 2;
2977 }
2978
2979 --idxa;
2980 --idxb;
2981 res = table [idxa][idxb];
2982
2983 VERIFIER_DEBUG ( printf ("binop res %d\n", res); );
2984 VERIFIER_DEBUG ( printf ("idxa %d idxb %d\n", idxa, idxb); );
2985
2986 top = stack_push (ctx);
2987 if (res == TYPE_INV) {
2988 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Binary instruction applyed to ill formed stack (%s x %s)", stack_slot_get_name (a), stack_slot_get_name (b)));
2989 copy_stack_value (top, a);
2990 return;
2991 }
2992
2993 if (res & NON_VERIFIABLE_RESULT) {
2994 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Binary instruction is not verifiable (%s x %s)", stack_slot_get_name (a), stack_slot_get_name (b)));
2995
2996 res = res & ~NON_VERIFIABLE_RESULT;
2997 }
2998
2999 if (complexMerge && res == TYPE_PTR) {
3000 if (complexMerge == 1)
3001 copy_stack_value (top, a);
3002 else if (complexMerge == 2)
3003 copy_stack_value (top, b);
3004 /*
3005 * There is no need to merge the type of two pointers.
3006 * The only valid operation is subtraction, that returns a native
3007 * int as result and can be used with any 2 pointer kinds.
3008 * This is valid acording to Patition III 1.1.4
3009 */
3010 } else
3011 top->stype = res;
3012
3013 }
3014
3015
3016 static void
do_boolean_branch_op(VerifyContext * ctx,int delta)3017 do_boolean_branch_op (VerifyContext *ctx, int delta)
3018 {
3019 int target = ctx->ip_offset + delta;
3020 ILStackDesc *top;
3021
3022 VERIFIER_DEBUG ( printf ("boolean branch offset %d delta %d target %d\n", ctx->ip_offset, delta, target); );
3023
3024 if (target < 0 || target >= ctx->code_size) {
3025 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Boolean branch target out of code at 0x%04x", ctx->ip_offset));
3026 return;
3027 }
3028
3029 switch (is_valid_branch_instruction (ctx->header, ctx->ip_offset, target)) {
3030 case 1:
3031 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
3032 break;
3033 case 2:
3034 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
3035 return;
3036 }
3037
3038 ctx->target = target;
3039
3040 if (!check_underflow (ctx, 1))
3041 return;
3042
3043 top = stack_pop (ctx);
3044 if (!is_valid_bool_arg (top))
3045 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Argument type %s not valid for brtrue/brfalse at 0x%04x", stack_slot_get_name (top), ctx->ip_offset));
3046
3047 check_unmanaged_pointer (ctx, top);
3048 }
3049
3050 static gboolean
stack_slot_is_complex_type_not_reference_type(ILStackDesc * slot)3051 stack_slot_is_complex_type_not_reference_type (ILStackDesc *slot)
3052 {
3053 return stack_slot_get_type (slot) == TYPE_COMPLEX && !MONO_TYPE_IS_REFERENCE (slot->type) && !stack_slot_is_boxed_value (slot);
3054 }
3055
3056 static gboolean
stack_slot_is_reference_value(ILStackDesc * slot)3057 stack_slot_is_reference_value (ILStackDesc *slot)
3058 {
3059 return stack_slot_get_type (slot) == TYPE_COMPLEX && (MONO_TYPE_IS_REFERENCE (slot->type) || stack_slot_is_boxed_value (slot));
3060 }
3061
3062 static void
do_branch_op(VerifyContext * ctx,signed int delta,const unsigned char table[TYPE_MAX][TYPE_MAX])3063 do_branch_op (VerifyContext *ctx, signed int delta, const unsigned char table [TYPE_MAX][TYPE_MAX])
3064 {
3065 ILStackDesc *a, *b;
3066 int idxa, idxb;
3067 unsigned char res;
3068 int target = ctx->ip_offset + delta;
3069
3070 VERIFIER_DEBUG ( printf ("branch offset %d delta %d target %d\n", ctx->ip_offset, delta, target); );
3071
3072 if (target < 0 || target >= ctx->code_size) {
3073 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target out of code at 0x%04x", ctx->ip_offset));
3074 return;
3075 }
3076
3077 switch (is_valid_cmp_branch_instruction (ctx->header, ctx->ip_offset, target)) {
3078 case 1: /*FIXME use constants and not magic numbers.*/
3079 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
3080 break;
3081 case 2:
3082 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
3083 return;
3084 }
3085
3086 ctx->target = target;
3087
3088 if (!check_underflow (ctx, 2))
3089 return;
3090
3091 b = stack_pop (ctx);
3092 a = stack_pop (ctx);
3093
3094 idxa = stack_slot_get_underlying_type (a);
3095 if (stack_slot_is_managed_pointer (a))
3096 idxa = TYPE_PTR;
3097
3098 idxb = stack_slot_get_underlying_type (b);
3099 if (stack_slot_is_managed_pointer (b))
3100 idxb = TYPE_PTR;
3101
3102 if (stack_slot_is_complex_type_not_reference_type (a) || stack_slot_is_complex_type_not_reference_type (b)) {
3103 res = TYPE_INV;
3104 } else {
3105 --idxa;
3106 --idxb;
3107 res = table [idxa][idxb];
3108 }
3109
3110 VERIFIER_DEBUG ( printf ("branch res %d\n", res); );
3111 VERIFIER_DEBUG ( printf ("idxa %d idxb %d\n", idxa, idxb); );
3112
3113 if (res == TYPE_INV) {
3114 CODE_NOT_VERIFIABLE (ctx,
3115 g_strdup_printf ("Compare and Branch instruction applyed to ill formed stack (%s x %s) at 0x%04x", stack_slot_get_name (a), stack_slot_get_name (b), ctx->ip_offset));
3116 } else if (res & NON_VERIFIABLE_RESULT) {
3117 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Compare and Branch instruction is not verifiable (%s x %s) at 0x%04x", stack_slot_get_name (a), stack_slot_get_name (b), ctx->ip_offset));
3118 res = res & ~NON_VERIFIABLE_RESULT;
3119 }
3120 }
3121
3122 static void
do_cmp_op(VerifyContext * ctx,const unsigned char table[TYPE_MAX][TYPE_MAX],guint32 opcode)3123 do_cmp_op (VerifyContext *ctx, const unsigned char table [TYPE_MAX][TYPE_MAX], guint32 opcode)
3124 {
3125 ILStackDesc *a, *b;
3126 int idxa, idxb;
3127 unsigned char res;
3128
3129 if (!check_underflow (ctx, 2))
3130 return;
3131 b = stack_pop (ctx);
3132 a = stack_pop (ctx);
3133
3134 if (opcode == CEE_CGT_UN) {
3135 if ((stack_slot_is_reference_value (a) && stack_slot_is_null_literal (b)) ||
3136 (stack_slot_is_reference_value (b) && stack_slot_is_null_literal (a))) {
3137 stack_push_val (ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
3138 return;
3139 }
3140 }
3141
3142 idxa = stack_slot_get_underlying_type (a);
3143 if (stack_slot_is_managed_pointer (a))
3144 idxa = TYPE_PTR;
3145
3146 idxb = stack_slot_get_underlying_type (b);
3147 if (stack_slot_is_managed_pointer (b))
3148 idxb = TYPE_PTR;
3149
3150 if (stack_slot_is_complex_type_not_reference_type (a) || stack_slot_is_complex_type_not_reference_type (b)) {
3151 res = TYPE_INV;
3152 } else {
3153 --idxa;
3154 --idxb;
3155 res = table [idxa][idxb];
3156 }
3157
3158 if(res == TYPE_INV) {
3159 char *left_type = stack_slot_full_name (a);
3160 char *right_type = stack_slot_full_name (b);
3161 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf("Compare instruction applyed to ill formed stack (%s x %s) at 0x%04x", left_type, right_type, ctx->ip_offset));
3162 g_free (left_type);
3163 g_free (right_type);
3164 } else if (res & NON_VERIFIABLE_RESULT) {
3165 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Compare instruction is not verifiable (%s x %s) at 0x%04x", stack_slot_get_name (a), stack_slot_get_name (b), ctx->ip_offset));
3166 res = res & ~NON_VERIFIABLE_RESULT;
3167 }
3168 stack_push_val (ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
3169 }
3170
3171 static void
do_ret(VerifyContext * ctx)3172 do_ret (VerifyContext *ctx)
3173 {
3174 MonoType *ret = ctx->signature->ret;
3175 VERIFIER_DEBUG ( printf ("checking ret\n"); );
3176 if (ret->type != MONO_TYPE_VOID) {
3177 ILStackDesc *top;
3178 if (!check_underflow (ctx, 1))
3179 return;
3180
3181 top = stack_pop(ctx);
3182
3183 if (!verify_stack_type_compatibility (ctx, ctx->signature->ret, top)) {
3184 char *ret_type = mono_type_full_name (ctx->signature->ret);
3185 char *stack_type = stack_slot_full_name (top);
3186 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible return value on stack with method signature, expected '%s' but got '%s' at 0x%04x", ret_type, stack_type, ctx->ip_offset));
3187 g_free (stack_type);
3188 g_free (ret_type);
3189 return;
3190 }
3191
3192 if (ret->byref && !stack_slot_is_safe_byref (top))
3193 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Method returns byref and return value is not a safe-to-return-byref at 0x%04x", ctx->ip_offset));
3194
3195 if (ret->type == MONO_TYPE_TYPEDBYREF || mono_type_is_value_type (ret, "System", "ArgIterator") || mono_type_is_value_type (ret, "System", "RuntimeArgumentHandle"))
3196 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Method returns byref, TypedReference, ArgIterator or RuntimeArgumentHandle at 0x%04x", ctx->ip_offset));
3197 }
3198
3199 if (ctx->eval.size > 0) {
3200 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Stack not empty (%d) after ret at 0x%04x", ctx->eval.size, ctx->ip_offset));
3201 }
3202 if (in_any_block (ctx->header, ctx->ip_offset))
3203 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("ret cannot escape exception blocks at 0x%04x", ctx->ip_offset));
3204 }
3205
3206 /*
3207 * FIXME we need to fix the case of a non-virtual instance method defined in the parent but call using a token pointing to a subclass.
3208 * This is illegal but mono_get_method_full decoded it.
3209 * TODO handle calling .ctor outside one or calling the .ctor for other class but super
3210 */
3211 static void
do_invoke_method(VerifyContext * ctx,int method_token,gboolean virtual_)3212 do_invoke_method (VerifyContext *ctx, int method_token, gboolean virtual_)
3213 {
3214 MonoError error;
3215 int param_count, i;
3216 MonoMethodSignature *sig;
3217 ILStackDesc *value;
3218 MonoMethod *method;
3219 gboolean virt_check_this = FALSE;
3220 gboolean constrained = ctx->prefix_set & PREFIX_CONSTRAINED;
3221
3222 if (!(method = verifier_load_method (ctx, method_token, virtual_ ? "callvirt" : "call")))
3223 return;
3224
3225 if (virtual_) {
3226 CLEAR_PREFIX (ctx, PREFIX_CONSTRAINED);
3227
3228 if (method->klass->valuetype) // && !constrained ???
3229 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use callvirtual with valuetype method at 0x%04x", ctx->ip_offset));
3230
3231 if ((method->flags & METHOD_ATTRIBUTE_STATIC))
3232 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use callvirtual with static method at 0x%04x", ctx->ip_offset));
3233
3234 } else {
3235 if (method->flags & METHOD_ATTRIBUTE_ABSTRACT)
3236 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use call with an abstract method at 0x%04x", ctx->ip_offset));
3237
3238 if ((method->flags & METHOD_ATTRIBUTE_VIRTUAL) && !(method->flags & METHOD_ATTRIBUTE_FINAL) && !mono_class_is_sealed (method->klass)) {
3239 virt_check_this = TRUE;
3240 ctx->code [ctx->ip_offset].flags |= IL_CODE_CALL_NONFINAL_VIRTUAL;
3241 }
3242 }
3243
3244 if (!(sig = mono_method_get_signature_checked (method, ctx->image, method_token, ctx->generic_context, &error))) {
3245 mono_error_cleanup (&error);
3246 sig = mono_method_get_signature_checked (method, ctx->image, method_token, NULL, &error);
3247 }
3248
3249 if (!sig) {
3250 char *name = mono_type_get_full_name (method->klass);
3251 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Could not resolve signature of %s:%s at 0x%04x due to: %s", name, method->name, ctx->ip_offset, mono_error_get_message (&error)));
3252 mono_error_cleanup (&error);
3253 g_free (name);
3254 return;
3255 }
3256
3257 param_count = sig->param_count + sig->hasthis;
3258 if (!check_underflow (ctx, param_count))
3259 return;
3260
3261 gboolean is_safe_byref_call = TRUE;
3262
3263 for (i = sig->param_count - 1; i >= 0; --i) {
3264 VERIFIER_DEBUG ( printf ("verifying argument %d\n", i); );
3265 value = stack_pop (ctx);
3266 if (!verify_stack_type_compatibility (ctx, sig->params[i], value)) {
3267 char *stack_name = stack_slot_full_name (value);
3268 char *sig_name = mono_type_full_name (sig->params [i]);
3269 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible parameter with function signature: Calling method with signature (%s) but for argument %d there is a (%s) on stack at 0x%04x", sig_name, i, stack_name, ctx->ip_offset));
3270 g_free (stack_name);
3271 g_free (sig_name);
3272 }
3273
3274 if (stack_slot_is_managed_mutability_pointer (value))
3275 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer as argument of %s at 0x%04x", virtual_ ? "callvirt" : "call", ctx->ip_offset));
3276
3277 if ((ctx->prefix_set & PREFIX_TAIL) && stack_slot_is_managed_pointer (value)) {
3278 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Cannot pass a byref argument to a tail %s at 0x%04x", virtual_ ? "callvirt" : "call", ctx->ip_offset));
3279 return;
3280 }
3281 if (stack_slot_is_managed_pointer (value) && !stack_slot_is_safe_byref (value))
3282 is_safe_byref_call = FALSE;
3283 }
3284
3285 if (sig->hasthis) {
3286 MonoType *type = &method->klass->byval_arg;
3287 ILStackDesc copy;
3288
3289 if (mono_method_is_constructor (method) && !method->klass->valuetype) {
3290 if (IS_STRICT_MODE (ctx) && !mono_method_is_constructor (ctx->method))
3291 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot call a constructor outside one at 0x%04x", ctx->ip_offset));
3292 if (IS_STRICT_MODE (ctx) && method->klass != ctx->method->klass->parent && method->klass != ctx->method->klass)
3293 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot call a constructor of a type different from this or super at 0x%04x", ctx->ip_offset));
3294
3295 ctx->super_ctor_called = TRUE;
3296 value = stack_pop_safe (ctx);
3297 if (IS_STRICT_MODE (ctx) && (value->stype & THIS_POINTER_MASK) != THIS_POINTER_MASK)
3298 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid 'this ptr' argument for constructor at 0x%04x", ctx->ip_offset));
3299 if (!(value->stype & UNINIT_THIS_MASK))
3300 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Calling the base constructor on an initialized this pointer at 0x%04x", ctx->ip_offset));
3301 } else {
3302 value = stack_pop (ctx);
3303 }
3304
3305 copy_stack_value (©, value);
3306 //TODO we should extract this to a 'drop_byref_argument' and use everywhere
3307 //Other parts of the code suffer from the same issue of
3308 copy.type = mono_type_get_type_byval (copy.type);
3309 copy.stype &= ~POINTER_MASK;
3310
3311 if (virt_check_this && !stack_slot_is_this_pointer (value) && !(method->klass->valuetype || stack_slot_is_boxed_value (value)))
3312 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use the call opcode with a non-final virtual method on an object different than the 'this' pointer at 0x%04x", ctx->ip_offset));
3313
3314 if (constrained && virtual_) {
3315 if (!stack_slot_is_managed_pointer (value))
3316 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Object is not a managed pointer for a constrained call at 0x%04x", ctx->ip_offset));
3317 if (!mono_metadata_type_equal_full (mono_type_get_type_byval (value->type), mono_type_get_underlying_type (ctx->constrained_type), TRUE))
3318 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Object not compatible with constrained type at 0x%04x", ctx->ip_offset));
3319 copy.stype |= BOXED_MASK;
3320 copy.type = ctx->constrained_type;
3321 } else {
3322 if (stack_slot_is_managed_pointer (value) && !mono_class_from_mono_type (value->type)->valuetype)
3323 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot call a reference type using a managed pointer to the this arg at 0x%04x", ctx->ip_offset));
3324
3325 if (!virtual_ && mono_class_from_mono_type (value->type)->valuetype && !method->klass->valuetype && !stack_slot_is_boxed_value (value))
3326 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot call a valuetype baseclass at 0x%04x", ctx->ip_offset));
3327
3328 if (virtual_ && mono_class_from_mono_type (value->type)->valuetype && !stack_slot_is_boxed_value (value))
3329 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a valuetype with callvirt at 0x%04x", ctx->ip_offset));
3330
3331 if (method->klass->valuetype && (stack_slot_is_boxed_value (value) || !stack_slot_is_managed_pointer (value)))
3332 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a boxed or literal valuetype to call a valuetype method at 0x%04x", ctx->ip_offset));
3333 }
3334 if (!verify_stack_type_compatibility (ctx, type, ©)) {
3335 char *expected = mono_type_full_name (type);
3336 char *effective = stack_slot_full_name (©);
3337 char *method_name = mono_method_full_name (method, TRUE);
3338 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible this argument on stack with method signature expected '%s' but got '%s' for a call to '%s' at 0x%04x",
3339 expected, effective, method_name, ctx->ip_offset));
3340 g_free (method_name);
3341 g_free (effective);
3342 g_free (expected);
3343 }
3344
3345 if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_method_full (ctx->method, method, mono_class_from_mono_type (value->type))) {
3346 char *name = mono_method_full_name (method, TRUE);
3347 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Method %s is not accessible at 0x%04x", name, ctx->ip_offset), MONO_EXCEPTION_METHOD_ACCESS);
3348 g_free (name);
3349 }
3350
3351 } else if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_method_full (ctx->method, method, NULL)) {
3352 char *name = mono_method_full_name (method, TRUE);
3353 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Method %s is not accessible at 0x%04x", name, ctx->ip_offset), MONO_EXCEPTION_METHOD_ACCESS);
3354 g_free (name);
3355 }
3356
3357 if (sig->ret->type != MONO_TYPE_VOID) {
3358 if (!mono_type_is_valid_in_context (ctx, sig->ret))
3359 return;
3360
3361 if (check_overflow (ctx)) {
3362 value = stack_push (ctx);
3363 set_stack_value (ctx, value, sig->ret, FALSE);
3364 if ((ctx->prefix_set & PREFIX_READONLY) && method->klass->rank && !strcmp (method->name, "Address")) {
3365 ctx->prefix_set &= ~PREFIX_READONLY;
3366 value->stype |= CMMP_MASK;
3367 }
3368 if (sig->ret->byref && is_safe_byref_call)
3369 value->stype |= SAFE_BYREF_MASK;
3370 }
3371 }
3372
3373 if ((ctx->prefix_set & PREFIX_TAIL)) {
3374 if (!mono_delegate_ret_equal (mono_method_signature (ctx->method)->ret, sig->ret))
3375 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Tail call with incompatible return type at 0x%04x", ctx->ip_offset));
3376 if (ctx->header->code [ctx->ip_offset + 5] != CEE_RET)
3377 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Tail call not followed by ret at 0x%04x", ctx->ip_offset));
3378 }
3379
3380 }
3381
3382 static void
do_push_static_field(VerifyContext * ctx,int token,gboolean take_addr)3383 do_push_static_field (VerifyContext *ctx, int token, gboolean take_addr)
3384 {
3385 MonoClassField *field;
3386 MonoClass *klass;
3387 if (!check_overflow (ctx))
3388 return;
3389 if (!take_addr)
3390 CLEAR_PREFIX (ctx, PREFIX_VOLATILE);
3391
3392 if (!(field = verifier_load_field (ctx, token, &klass, take_addr ? "ldsflda" : "ldsfld")))
3393 return;
3394
3395 if (!(field->type->attrs & FIELD_ATTRIBUTE_STATIC)) {
3396 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Cannot load non static field at 0x%04x", ctx->ip_offset));
3397 return;
3398 }
3399 /*taking the address of initonly field only works from the static constructor */
3400 if (take_addr && (field->type->attrs & FIELD_ATTRIBUTE_INIT_ONLY) &&
3401 !(field->parent == ctx->method->klass && (ctx->method->flags & (METHOD_ATTRIBUTE_SPECIAL_NAME | METHOD_ATTRIBUTE_STATIC)) && !strcmp (".cctor", ctx->method->name)))
3402 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot take the address of a init-only field at 0x%04x", ctx->ip_offset));
3403
3404 if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_field_full (ctx->method, field, NULL))
3405 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Type at stack is not accessible at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_FIELD_ACCESS);
3406
3407 ILStackDesc *value = stack_push (ctx);
3408 set_stack_value (ctx, value, field->type, take_addr);
3409 if (take_addr)
3410 value->stype |= SAFE_BYREF_MASK;
3411 }
3412
3413 static void
do_store_static_field(VerifyContext * ctx,int token)3414 do_store_static_field (VerifyContext *ctx, int token) {
3415 MonoClassField *field;
3416 MonoClass *klass;
3417 ILStackDesc *value;
3418 CLEAR_PREFIX (ctx, PREFIX_VOLATILE);
3419
3420 if (!check_underflow (ctx, 1))
3421 return;
3422
3423 value = stack_pop (ctx);
3424
3425 if (!(field = verifier_load_field (ctx, token, &klass, "stsfld")))
3426 return;
3427
3428 if (!(field->type->attrs & FIELD_ATTRIBUTE_STATIC)) {
3429 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Cannot store non static field at 0x%04x", ctx->ip_offset));
3430 return;
3431 }
3432
3433 if (field->type->type == MONO_TYPE_TYPEDBYREF) {
3434 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Typedbyref field is an unverfiable type in store static field at 0x%04x", ctx->ip_offset));
3435 return;
3436 }
3437
3438 if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_field_full (ctx->method, field, NULL))
3439 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Type at stack is not accessible at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_FIELD_ACCESS);
3440
3441 if (!verify_stack_type_compatibility (ctx, field->type, value)) {
3442 char *stack_name = stack_slot_full_name (value);
3443 char *field_name = mono_type_full_name (field->type);
3444 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible type in static field store expected '%s' but found '%s' at 0x%04x",
3445 field_name, stack_name, ctx->ip_offset));
3446 g_free (field_name);
3447 g_free (stack_name);
3448 }
3449 }
3450
3451 static gboolean
check_is_valid_type_for_field_ops(VerifyContext * ctx,int token,ILStackDesc * obj,MonoClassField ** ret_field,const char * opcode)3452 check_is_valid_type_for_field_ops (VerifyContext *ctx, int token, ILStackDesc *obj, MonoClassField **ret_field, const char *opcode)
3453 {
3454 MonoClassField *field;
3455 MonoClass *klass;
3456 gboolean is_pointer;
3457
3458 /*must be a reference type, a managed pointer, an unamanaged pointer, or a valuetype*/
3459 if (!(field = verifier_load_field (ctx, token, &klass, opcode)))
3460 return FALSE;
3461
3462 *ret_field = field;
3463 //the value on stack is going to be used as a pointer
3464 is_pointer = stack_slot_get_type (obj) == TYPE_PTR || (stack_slot_get_type (obj) == TYPE_NATIVE_INT && !get_stack_type (&field->parent->byval_arg));
3465
3466 if (field->type->type == MONO_TYPE_TYPEDBYREF) {
3467 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Typedbyref field is an unverfiable type at 0x%04x", ctx->ip_offset));
3468 return FALSE;
3469 }
3470 g_assert (obj->type);
3471
3472 /*The value on the stack must be a subclass of the defining type of the field*/
3473 /* we need to check if we can load the field from the stack value*/
3474 if (is_pointer) {
3475 if (stack_slot_get_underlying_type (obj) == TYPE_NATIVE_INT)
3476 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Native int is not a verifiable type to reference a field at 0x%04x", ctx->ip_offset));
3477
3478 if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_field_full (ctx->method, field, NULL))
3479 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Type at stack is not accessible at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_FIELD_ACCESS);
3480 } else {
3481 if (!field->parent->valuetype && stack_slot_is_managed_pointer (obj))
3482 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type at stack is a managed pointer to a reference type and is not compatible to reference the field at 0x%04x", ctx->ip_offset));
3483
3484 /*a value type can be loaded from a value or a managed pointer, but not a boxed object*/
3485 if (field->parent->valuetype && stack_slot_is_boxed_value (obj))
3486 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type at stack is a boxed valuetype and is not compatible to reference the field at 0x%04x", ctx->ip_offset));
3487
3488 if (!stack_slot_is_null_literal (obj) && !verify_stack_type_compatibility_full (ctx, &field->parent->byval_arg, obj, TRUE, FALSE)) {
3489 char *found = stack_slot_full_name (obj);
3490 char *expected = mono_type_full_name (&field->parent->byval_arg);
3491 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Expected type '%s' but found '%s' referencing the 'this' argument at 0x%04x", expected, found, ctx->ip_offset));
3492 g_free (found);
3493 g_free (expected);
3494 }
3495
3496 if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_field_full (ctx->method, field, mono_class_from_mono_type (obj->type)))
3497 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Type at stack is not accessible at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_FIELD_ACCESS);
3498 }
3499
3500 check_unmanaged_pointer (ctx, obj);
3501 return TRUE;
3502 }
3503
3504 static void
do_push_field(VerifyContext * ctx,int token,gboolean take_addr)3505 do_push_field (VerifyContext *ctx, int token, gboolean take_addr)
3506 {
3507 ILStackDesc *obj;
3508 MonoClassField *field;
3509 gboolean is_safe_byref = FALSE;
3510
3511 if (!take_addr)
3512 CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
3513
3514 if (!check_underflow (ctx, 1))
3515 return;
3516 obj = stack_pop_safe (ctx);
3517
3518 if (!check_is_valid_type_for_field_ops (ctx, token, obj, &field, take_addr ? "ldflda" : "ldfld"))
3519 return;
3520
3521 if (take_addr && field->parent->valuetype && !stack_slot_is_managed_pointer (obj))
3522 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot take the address of a temporary value-type at 0x%04x", ctx->ip_offset));
3523
3524 if (take_addr && (field->type->attrs & FIELD_ATTRIBUTE_INIT_ONLY) &&
3525 !(field->parent == ctx->method->klass && mono_method_is_constructor (ctx->method)))
3526 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot take the address of a init-only field at 0x%04x", ctx->ip_offset));
3527
3528 //must do it here cuz stack_push will return the same slot as obj above
3529 is_safe_byref = take_addr && (stack_slot_is_reference_value (obj) || stack_slot_is_safe_byref (obj));
3530
3531 ILStackDesc *value = stack_push (ctx);
3532 set_stack_value (ctx, value, field->type, take_addr);
3533
3534 if (is_safe_byref)
3535 value->stype |= SAFE_BYREF_MASK;
3536 }
3537
3538 static void
do_store_field(VerifyContext * ctx,int token)3539 do_store_field (VerifyContext *ctx, int token)
3540 {
3541 ILStackDesc *value, *obj;
3542 MonoClassField *field;
3543 CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
3544
3545 if (!check_underflow (ctx, 2))
3546 return;
3547
3548 value = stack_pop (ctx);
3549 obj = stack_pop_safe (ctx);
3550
3551 if (!check_is_valid_type_for_field_ops (ctx, token, obj, &field, "stfld"))
3552 return;
3553
3554 if (!verify_stack_type_compatibility (ctx, field->type, value))
3555 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible type %s in field store at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
3556 }
3557
3558 /*TODO proper handle for Nullable<T>*/
3559 static void
do_box_value(VerifyContext * ctx,int klass_token)3560 do_box_value (VerifyContext *ctx, int klass_token)
3561 {
3562 ILStackDesc *value;
3563 MonoType *type = get_boxable_mono_type (ctx, klass_token, "box");
3564 MonoClass *klass;
3565
3566 if (!type)
3567 return;
3568
3569 if (!check_underflow (ctx, 1))
3570 return;
3571
3572 value = stack_pop (ctx);
3573 /*box is a nop for reference types*/
3574
3575 if (stack_slot_get_underlying_type (value) == TYPE_COMPLEX && MONO_TYPE_IS_REFERENCE (value->type) && MONO_TYPE_IS_REFERENCE (type)) {
3576 stack_push_stack_val (ctx, value)->stype |= BOXED_MASK;
3577 return;
3578 }
3579
3580
3581 if (!verify_stack_type_compatibility (ctx, type, value))
3582 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for boxing operation at 0x%04x", ctx->ip_offset));
3583
3584 klass = mono_class_from_mono_type (type);
3585 if (mono_class_is_nullable (klass))
3586 type = &mono_class_get_nullable_param (klass)->byval_arg;
3587 stack_push_val (ctx, TYPE_COMPLEX | BOXED_MASK, type);
3588 }
3589
3590 static void
do_unbox_value(VerifyContext * ctx,int klass_token)3591 do_unbox_value (VerifyContext *ctx, int klass_token)
3592 {
3593 ILStackDesc *value;
3594 MonoType *type = get_boxable_mono_type (ctx, klass_token, "unbox");
3595
3596 if (!type)
3597 return;
3598
3599 if (!check_underflow (ctx, 1))
3600 return;
3601
3602 if (!mono_class_from_mono_type (type)->valuetype)
3603 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid reference type for unbox at 0x%04x", ctx->ip_offset));
3604
3605 value = stack_pop (ctx);
3606
3607 /*Value should be: a boxed valuetype or a reference type*/
3608 if (!(stack_slot_get_type (value) == TYPE_COMPLEX &&
3609 (stack_slot_is_boxed_value (value) || !mono_class_from_mono_type (value->type)->valuetype)))
3610 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type %s at stack for unbox operation at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
3611
3612 set_stack_value (ctx, value = stack_push (ctx), mono_type_get_type_byref (type), FALSE);
3613 value->stype |= CMMP_MASK;
3614 }
3615
3616 static void
do_unbox_any(VerifyContext * ctx,int klass_token)3617 do_unbox_any (VerifyContext *ctx, int klass_token)
3618 {
3619 ILStackDesc *value;
3620 MonoType *type = get_boxable_mono_type (ctx, klass_token, "unbox.any");
3621
3622 if (!type)
3623 return;
3624
3625 if (!check_underflow (ctx, 1))
3626 return;
3627
3628 value = stack_pop (ctx);
3629
3630 /*Value should be: a boxed valuetype or a reference type*/
3631 if (!(stack_slot_get_type (value) == TYPE_COMPLEX &&
3632 (stack_slot_is_boxed_value (value) || !mono_class_from_mono_type (value->type)->valuetype)))
3633 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type %s at stack for unbox.any operation at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
3634
3635 set_stack_value (ctx, stack_push (ctx), type, FALSE);
3636 }
3637
3638 static void
do_unary_math_op(VerifyContext * ctx,int op)3639 do_unary_math_op (VerifyContext *ctx, int op)
3640 {
3641 ILStackDesc *value;
3642 if (!check_underflow (ctx, 1))
3643 return;
3644 value = stack_pop (ctx);
3645 switch (stack_slot_get_type (value)) {
3646 case TYPE_I4:
3647 case TYPE_I8:
3648 case TYPE_NATIVE_INT:
3649 break;
3650 case TYPE_R8:
3651 if (op == CEE_NEG)
3652 break;
3653 case TYPE_COMPLEX: /*only enums are ok*/
3654 if (mono_type_is_enum_type (value->type))
3655 break;
3656 default:
3657 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for unary not at 0x%04x", ctx->ip_offset));
3658 }
3659 stack_push_stack_val (ctx, value);
3660 }
3661
3662 static void
do_conversion(VerifyContext * ctx,int kind)3663 do_conversion (VerifyContext *ctx, int kind)
3664 {
3665 ILStackDesc *value;
3666 if (!check_underflow (ctx, 1))
3667 return;
3668 value = stack_pop (ctx);
3669
3670 switch (stack_slot_get_type (value)) {
3671 case TYPE_I4:
3672 case TYPE_I8:
3673 case TYPE_NATIVE_INT:
3674 case TYPE_R8:
3675 break;
3676 default:
3677 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type (%s) at stack for conversion operation. Numeric type expected at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
3678 }
3679
3680 switch (kind) {
3681 case TYPE_I4:
3682 stack_push_val (ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
3683 break;
3684 case TYPE_I8:
3685 stack_push_val (ctx,TYPE_I8, &mono_defaults.int64_class->byval_arg);
3686 break;
3687 case TYPE_R8:
3688 stack_push_val (ctx, TYPE_R8, &mono_defaults.double_class->byval_arg);
3689 break;
3690 case TYPE_NATIVE_INT:
3691 stack_push_val (ctx, TYPE_NATIVE_INT, &mono_defaults.int_class->byval_arg);
3692 break;
3693 default:
3694 g_error ("unknown type %02x in conversion", kind);
3695
3696 }
3697 }
3698
3699 static void
do_load_token(VerifyContext * ctx,int token)3700 do_load_token (VerifyContext *ctx, int token)
3701 {
3702 MonoError error;
3703 gpointer handle;
3704 MonoClass *handle_class;
3705 if (!check_overflow (ctx))
3706 return;
3707
3708 if (ctx->method->wrapper_type != MONO_WRAPPER_NONE) {
3709 handle = mono_method_get_wrapper_data (ctx->method, token);
3710 handle_class = (MonoClass *)mono_method_get_wrapper_data (ctx->method, token + 1);
3711 if (handle_class == mono_defaults.typehandle_class)
3712 handle = &((MonoClass*)handle)->byval_arg;
3713 } else {
3714 switch (token & 0xff000000) {
3715 case MONO_TOKEN_TYPE_DEF:
3716 case MONO_TOKEN_TYPE_REF:
3717 case MONO_TOKEN_TYPE_SPEC:
3718 case MONO_TOKEN_FIELD_DEF:
3719 case MONO_TOKEN_METHOD_DEF:
3720 case MONO_TOKEN_METHOD_SPEC:
3721 case MONO_TOKEN_MEMBER_REF:
3722 if (!token_bounds_check (ctx->image, token)) {
3723 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Table index out of range 0x%x for token %x for ldtoken at 0x%04x", mono_metadata_token_index (token), token, ctx->ip_offset));
3724 return;
3725 }
3726 break;
3727 default:
3728 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid table 0x%x for token 0x%x for ldtoken at 0x%04x", mono_metadata_token_table (token), token, ctx->ip_offset));
3729 return;
3730 }
3731
3732 handle = mono_ldtoken_checked (ctx->image, token, &handle_class, ctx->generic_context, &error);
3733 }
3734
3735 if (!handle) {
3736 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid token 0x%x for ldtoken at 0x%04x due to %s", token, ctx->ip_offset, mono_error_get_message (&error)));
3737 mono_error_cleanup (&error);
3738 return;
3739 }
3740 if (handle_class == mono_defaults.typehandle_class) {
3741 mono_type_is_valid_in_context (ctx, (MonoType*)handle);
3742 } else if (handle_class == mono_defaults.methodhandle_class) {
3743 mono_method_is_valid_in_context (ctx, (MonoMethod*)handle);
3744 } else if (handle_class == mono_defaults.fieldhandle_class) {
3745 mono_type_is_valid_in_context (ctx, &((MonoClassField*)handle)->parent->byval_arg);
3746 } else {
3747 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid ldtoken type %x at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
3748 }
3749 stack_push_val (ctx, TYPE_COMPLEX, mono_class_get_type (handle_class));
3750 }
3751
3752 static void
do_ldobj_value(VerifyContext * ctx,int token)3753 do_ldobj_value (VerifyContext *ctx, int token)
3754 {
3755 ILStackDesc *value;
3756 MonoType *type = get_boxable_mono_type (ctx, token, "ldobj");
3757 CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
3758
3759 if (!type)
3760 return;
3761
3762 if (!check_underflow (ctx, 1))
3763 return;
3764
3765 value = stack_pop (ctx);
3766 if (!stack_slot_is_managed_pointer (value)
3767 && stack_slot_get_type (value) != TYPE_NATIVE_INT
3768 && !(stack_slot_get_type (value) == TYPE_PTR && value->type->type != MONO_TYPE_FNPTR)) {
3769 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid argument %s to ldobj at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
3770 return;
3771 }
3772
3773 if (stack_slot_get_type (value) == TYPE_NATIVE_INT)
3774 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Using native pointer to ldobj at 0x%04x", ctx->ip_offset));
3775
3776 /*We have a byval on the stack, but the comparison must be strict. */
3777 if (!verify_type_compatibility_full (ctx, type, mono_type_get_type_byval (value->type), TRUE))
3778 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for ldojb operation at 0x%04x", ctx->ip_offset));
3779
3780 set_stack_value (ctx, stack_push (ctx), type, FALSE);
3781 }
3782
3783 static void
do_stobj(VerifyContext * ctx,int token)3784 do_stobj (VerifyContext *ctx, int token)
3785 {
3786 ILStackDesc *dest, *src;
3787 MonoType *type = get_boxable_mono_type (ctx, token, "stobj");
3788 CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
3789
3790 if (!type)
3791 return;
3792
3793 if (!check_underflow (ctx, 2))
3794 return;
3795
3796 src = stack_pop (ctx);
3797 dest = stack_pop (ctx);
3798
3799 if (stack_slot_is_managed_mutability_pointer (dest))
3800 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with stobj at 0x%04x", ctx->ip_offset));
3801
3802 if (!stack_slot_is_managed_pointer (dest))
3803 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid destination of stobj operation at 0x%04x", ctx->ip_offset));
3804
3805 if (stack_slot_is_boxed_value (src) && !MONO_TYPE_IS_REFERENCE (src->type) && !MONO_TYPE_IS_REFERENCE (type))
3806 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use stobj with a boxed source value that is not a reference type at 0x%04x", ctx->ip_offset));
3807
3808 if (!verify_stack_type_compatibility (ctx, type, src)) {
3809 char *type_name = mono_type_full_name (type);
3810 char *src_name = stack_slot_full_name (src);
3811 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Token '%s' and source '%s' of stobj don't match ' at 0x%04x", type_name, src_name, ctx->ip_offset));
3812 g_free (type_name);
3813 g_free (src_name);
3814 }
3815
3816 if (!verify_type_compatibility (ctx, mono_type_get_type_byval (dest->type), type))
3817 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Destination and token types of stobj don't match at 0x%04x", ctx->ip_offset));
3818 }
3819
3820 static void
do_cpobj(VerifyContext * ctx,int token)3821 do_cpobj (VerifyContext *ctx, int token)
3822 {
3823 ILStackDesc *dest, *src;
3824 MonoType *type = get_boxable_mono_type (ctx, token, "cpobj");
3825 if (!type)
3826 return;
3827
3828 if (!check_underflow (ctx, 2))
3829 return;
3830
3831 src = stack_pop (ctx);
3832 dest = stack_pop (ctx);
3833
3834 if (!stack_slot_is_managed_pointer (src))
3835 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid source of cpobj operation at 0x%04x", ctx->ip_offset));
3836
3837 if (!stack_slot_is_managed_pointer (dest))
3838 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid destination of cpobj operation at 0x%04x", ctx->ip_offset));
3839
3840 if (stack_slot_is_managed_mutability_pointer (dest))
3841 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with cpobj at 0x%04x", ctx->ip_offset));
3842
3843 if (!verify_type_compatibility (ctx, type, mono_type_get_type_byval (src->type)))
3844 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Token and source types of cpobj don't match at 0x%04x", ctx->ip_offset));
3845
3846 if (!verify_type_compatibility (ctx, mono_type_get_type_byval (dest->type), type))
3847 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Destination and token types of cpobj don't match at 0x%04x", ctx->ip_offset));
3848 }
3849
3850 static void
do_initobj(VerifyContext * ctx,int token)3851 do_initobj (VerifyContext *ctx, int token)
3852 {
3853 ILStackDesc *obj;
3854 MonoType *stack, *type = get_boxable_mono_type (ctx, token, "initobj");
3855 if (!type)
3856 return;
3857
3858 if (!check_underflow (ctx, 1))
3859 return;
3860
3861 obj = stack_pop (ctx);
3862
3863 if (!stack_slot_is_managed_pointer (obj))
3864 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid object address for initobj at 0x%04x", ctx->ip_offset));
3865
3866 if (stack_slot_is_managed_mutability_pointer (obj))
3867 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with initobj at 0x%04x", ctx->ip_offset));
3868
3869 stack = mono_type_get_type_byval (obj->type);
3870 if (MONO_TYPE_IS_REFERENCE (stack)) {
3871 if (!verify_type_compatibility (ctx, stack, type))
3872 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type token of initobj not compatible with value on stack at 0x%04x", ctx->ip_offset));
3873 else if (IS_STRICT_MODE (ctx) && !mono_metadata_type_equal (type, stack))
3874 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type token of initobj not compatible with value on stack at 0x%04x", ctx->ip_offset));
3875 } else if (!verify_type_compatibility (ctx, stack, type)) {
3876 char *expected_name = mono_type_full_name (type);
3877 char *stack_name = mono_type_full_name (stack);
3878
3879 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Initobj %s not compatible with value on stack %s at 0x%04x", expected_name, stack_name, ctx->ip_offset));
3880 g_free (expected_name);
3881 g_free (stack_name);
3882 }
3883 }
3884
3885 static void
do_newobj(VerifyContext * ctx,int token)3886 do_newobj (VerifyContext *ctx, int token)
3887 {
3888 ILStackDesc *value;
3889 int i;
3890 MonoMethodSignature *sig;
3891 MonoMethod *method;
3892 gboolean is_delegate = FALSE;
3893
3894 if (!(method = verifier_load_method (ctx, token, "newobj")))
3895 return;
3896
3897 if (!mono_method_is_constructor (method)) {
3898 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Method from token 0x%08x not a constructor at 0x%04x", token, ctx->ip_offset));
3899 return;
3900 }
3901
3902 if (mono_class_get_flags (method->klass) & (TYPE_ATTRIBUTE_ABSTRACT | TYPE_ATTRIBUTE_INTERFACE))
3903 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Trying to instantiate an abstract or interface type at 0x%04x", ctx->ip_offset));
3904
3905 if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_method_full (ctx->method, method, NULL)) {
3906 char *from = mono_method_full_name (ctx->method, TRUE);
3907 char *to = mono_method_full_name (method, TRUE);
3908 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Constructor %s not visible from %s at 0x%04x", to, from, ctx->ip_offset), MONO_EXCEPTION_METHOD_ACCESS);
3909 g_free (from);
3910 g_free (to);
3911 }
3912
3913 //FIXME use mono_method_get_signature_full
3914 sig = mono_method_signature (method);
3915 if (!sig) {
3916 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid constructor signature to newobj at 0x%04x", ctx->ip_offset));
3917 return;
3918 }
3919
3920 if (!sig->hasthis) {
3921 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid constructor signature missing hasthis at 0x%04x", ctx->ip_offset));
3922 return;
3923 }
3924
3925 if (!check_underflow (ctx, sig->param_count))
3926 return;
3927
3928 is_delegate = method->klass->parent == mono_defaults.multicastdelegate_class;
3929
3930 if (is_delegate) {
3931 ILStackDesc *funptr;
3932 //first arg is object, second arg is fun ptr
3933 if (sig->param_count != 2) {
3934 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid delegate constructor at 0x%04x", ctx->ip_offset));
3935 return;
3936 }
3937 funptr = stack_pop (ctx);
3938 value = stack_pop (ctx);
3939 verify_delegate_compatibility (ctx, method->klass, value, funptr);
3940 } else {
3941 for (i = sig->param_count - 1; i >= 0; --i) {
3942 VERIFIER_DEBUG ( printf ("verifying constructor argument %d\n", i); );
3943 value = stack_pop (ctx);
3944 if (!verify_stack_type_compatibility (ctx, sig->params [i], value)) {
3945 char *stack_name = stack_slot_full_name (value);
3946 char *sig_name = mono_type_full_name (sig->params [i]);
3947 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Incompatible parameter value with constructor signature: %s X %s at 0x%04x", sig_name, stack_name, ctx->ip_offset));
3948 g_free (stack_name);
3949 g_free (sig_name);
3950 }
3951
3952 if (stack_slot_is_managed_mutability_pointer (value))
3953 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer as argument of newobj at 0x%04x", ctx->ip_offset));
3954 }
3955 }
3956
3957 if (check_overflow (ctx))
3958 set_stack_value (ctx, stack_push (ctx), &method->klass->byval_arg, FALSE);
3959 }
3960
3961 static void
do_cast(VerifyContext * ctx,int token,const char * opcode)3962 do_cast (VerifyContext *ctx, int token, const char *opcode) {
3963 ILStackDesc *value;
3964 MonoType *type;
3965 gboolean is_boxed;
3966 gboolean do_box;
3967
3968 if (!check_underflow (ctx, 1))
3969 return;
3970
3971 if (!(type = get_boxable_mono_type (ctx, token, opcode)))
3972 return;
3973
3974 if (type->byref) {
3975 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid %s type at 0x%04x", opcode, ctx->ip_offset));
3976 return;
3977 }
3978
3979 value = stack_pop (ctx);
3980 is_boxed = stack_slot_is_boxed_value (value);
3981
3982 if (stack_slot_is_managed_pointer (value))
3983 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value for %s at 0x%04x", opcode, ctx->ip_offset));
3984 else if (!MONO_TYPE_IS_REFERENCE (value->type) && !is_boxed) {
3985 char *name = stack_slot_full_name (value);
3986 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Expected a reference type on stack for %s but found %s at 0x%04x", opcode, name, ctx->ip_offset));
3987 g_free (name);
3988 }
3989
3990 switch (value->type->type) {
3991 case MONO_TYPE_FNPTR:
3992 case MONO_TYPE_PTR:
3993 case MONO_TYPE_TYPEDBYREF:
3994 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value for %s at 0x%04x", opcode, ctx->ip_offset));
3995 default:
3996 break;
3997 }
3998
3999 do_box = is_boxed || mono_type_is_generic_argument(type) || mono_class_from_mono_type (type)->valuetype;
4000 stack_push_val (ctx, TYPE_COMPLEX | (do_box ? BOXED_MASK : 0), type);
4001 }
4002
4003 static MonoType *
mono_type_from_opcode(int opcode)4004 mono_type_from_opcode (int opcode) {
4005 switch (opcode) {
4006 case CEE_LDIND_I1:
4007 case CEE_LDIND_U1:
4008 case CEE_STIND_I1:
4009 case CEE_LDELEM_I1:
4010 case CEE_LDELEM_U1:
4011 case CEE_STELEM_I1:
4012 return &mono_defaults.sbyte_class->byval_arg;
4013
4014 case CEE_LDIND_I2:
4015 case CEE_LDIND_U2:
4016 case CEE_STIND_I2:
4017 case CEE_LDELEM_I2:
4018 case CEE_LDELEM_U2:
4019 case CEE_STELEM_I2:
4020 return &mono_defaults.int16_class->byval_arg;
4021
4022 case CEE_LDIND_I4:
4023 case CEE_LDIND_U4:
4024 case CEE_STIND_I4:
4025 case CEE_LDELEM_I4:
4026 case CEE_LDELEM_U4:
4027 case CEE_STELEM_I4:
4028 return &mono_defaults.int32_class->byval_arg;
4029
4030 case CEE_LDIND_I8:
4031 case CEE_STIND_I8:
4032 case CEE_LDELEM_I8:
4033 case CEE_STELEM_I8:
4034 return &mono_defaults.int64_class->byval_arg;
4035
4036 case CEE_LDIND_R4:
4037 case CEE_STIND_R4:
4038 case CEE_LDELEM_R4:
4039 case CEE_STELEM_R4:
4040 return &mono_defaults.single_class->byval_arg;
4041
4042 case CEE_LDIND_R8:
4043 case CEE_STIND_R8:
4044 case CEE_LDELEM_R8:
4045 case CEE_STELEM_R8:
4046 return &mono_defaults.double_class->byval_arg;
4047
4048 case CEE_LDIND_I:
4049 case CEE_STIND_I:
4050 case CEE_LDELEM_I:
4051 case CEE_STELEM_I:
4052 return &mono_defaults.int_class->byval_arg;
4053
4054 case CEE_LDIND_REF:
4055 case CEE_STIND_REF:
4056 case CEE_LDELEM_REF:
4057 case CEE_STELEM_REF:
4058 return &mono_defaults.object_class->byval_arg;
4059
4060 default:
4061 g_error ("unknown opcode %02x in mono_type_from_opcode ", opcode);
4062 return NULL;
4063 }
4064 }
4065
4066 static void
do_load_indirect(VerifyContext * ctx,int opcode)4067 do_load_indirect (VerifyContext *ctx, int opcode)
4068 {
4069 ILStackDesc *value;
4070 CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
4071
4072 if (!check_underflow (ctx, 1))
4073 return;
4074
4075 value = stack_pop (ctx);
4076 if (!stack_slot_is_managed_pointer (value)) {
4077 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Load indirect not using a manager pointer at 0x%04x", ctx->ip_offset));
4078 set_stack_value (ctx, stack_push (ctx), mono_type_from_opcode (opcode), FALSE);
4079 return;
4080 }
4081
4082 if (opcode == CEE_LDIND_REF) {
4083 if (stack_slot_get_underlying_type (value) != TYPE_COMPLEX || mono_class_from_mono_type (value->type)->valuetype)
4084 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for ldind_ref expected object byref operation at 0x%04x", ctx->ip_offset));
4085 set_stack_value (ctx, stack_push (ctx), mono_type_get_type_byval (value->type), FALSE);
4086 } else {
4087 if (!verify_type_compatibility_full (ctx, mono_type_from_opcode (opcode), mono_type_get_type_byval (value->type), TRUE))
4088 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type at stack for ldind 0x%x operation at 0x%04x", opcode, ctx->ip_offset));
4089 set_stack_value (ctx, stack_push (ctx), mono_type_from_opcode (opcode), FALSE);
4090 }
4091 }
4092
4093 static void
do_store_indirect(VerifyContext * ctx,int opcode)4094 do_store_indirect (VerifyContext *ctx, int opcode)
4095 {
4096 ILStackDesc *addr, *val;
4097 CLEAR_PREFIX (ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
4098
4099 if (!check_underflow (ctx, 2))
4100 return;
4101
4102 val = stack_pop (ctx);
4103 addr = stack_pop (ctx);
4104
4105 check_unmanaged_pointer (ctx, addr);
4106
4107 if (!stack_slot_is_managed_pointer (addr) && stack_slot_get_type (addr) != TYPE_PTR) {
4108 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid non-pointer argument to stind at 0x%04x", ctx->ip_offset));
4109 return;
4110 }
4111
4112 if (stack_slot_is_managed_mutability_pointer (addr)) {
4113 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with stind at 0x%04x", ctx->ip_offset));
4114 return;
4115 }
4116
4117 if (!verify_type_compatibility_full (ctx, mono_type_from_opcode (opcode), mono_type_get_type_byval (addr->type), TRUE))
4118 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid addr type at stack for stind 0x%x operation at 0x%04x", opcode, ctx->ip_offset));
4119
4120 if (!verify_stack_type_compatibility (ctx, mono_type_from_opcode (opcode), val))
4121 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value type at stack for stind 0x%x operation at 0x%04x", opcode, ctx->ip_offset));
4122 }
4123
4124 static void
do_newarr(VerifyContext * ctx,int token)4125 do_newarr (VerifyContext *ctx, int token)
4126 {
4127 ILStackDesc *value;
4128 MonoType *type = get_boxable_mono_type (ctx, token, "newarr");
4129
4130 if (!type)
4131 return;
4132
4133 if (!check_underflow (ctx, 1))
4134 return;
4135
4136 value = stack_pop (ctx);
4137 if (stack_slot_get_type (value) != TYPE_I4 && stack_slot_get_type (value) != TYPE_NATIVE_INT)
4138 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Array size type on stack (%s) is not a verifiable type at 0x%04x", stack_slot_get_name (value), ctx->ip_offset));
4139
4140 set_stack_value (ctx, stack_push (ctx), mono_class_get_type (mono_array_class_get (mono_class_from_mono_type (type), 1)), FALSE);
4141 }
4142
4143 /*FIXME handle arrays that are not 0-indexed*/
4144 static void
do_ldlen(VerifyContext * ctx)4145 do_ldlen (VerifyContext *ctx)
4146 {
4147 ILStackDesc *value;
4148
4149 if (!check_underflow (ctx, 1))
4150 return;
4151
4152 value = stack_pop (ctx);
4153
4154 if (stack_slot_get_type (value) != TYPE_COMPLEX || value->type->type != MONO_TYPE_SZARRAY)
4155 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type for ldlen at 0x%04x", ctx->ip_offset));
4156
4157 stack_push_val (ctx, TYPE_NATIVE_INT, &mono_defaults.int_class->byval_arg);
4158 }
4159
4160 /*FIXME handle arrays that are not 0-indexed*/
4161 /*FIXME handle readonly prefix and CMMP*/
4162 static void
do_ldelema(VerifyContext * ctx,int klass_token)4163 do_ldelema (VerifyContext *ctx, int klass_token)
4164 {
4165 ILStackDesc *index, *array, *res;
4166 MonoType *type = get_boxable_mono_type (ctx, klass_token, "ldelema");
4167 gboolean valid;
4168
4169 if (!type)
4170 return;
4171
4172 if (!check_underflow (ctx, 2))
4173 return;
4174
4175 index = stack_pop (ctx);
4176 array = stack_pop (ctx);
4177
4178 if (stack_slot_get_type (index) != TYPE_I4 && stack_slot_get_type (index) != TYPE_NATIVE_INT)
4179 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Index type(%s) for ldelema is not an int or a native int at 0x%04x", stack_slot_get_name (index), ctx->ip_offset));
4180
4181 if (!stack_slot_is_null_literal (array)) {
4182 if (stack_slot_get_type (array) != TYPE_COMPLEX || array->type->type != MONO_TYPE_SZARRAY)
4183 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type(%s) for ldelema at 0x%04x", stack_slot_get_name (array), ctx->ip_offset));
4184 else {
4185 if (get_stack_type (type) == TYPE_I4 || get_stack_type (type) == TYPE_NATIVE_INT) {
4186 valid = verify_type_compatibility_full (ctx, type, &array->type->data.klass->byval_arg, TRUE);
4187 } else {
4188 valid = mono_metadata_type_equal (type, &array->type->data.klass->byval_arg);
4189 }
4190 if (!valid)
4191 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type on stack for ldelema at 0x%04x", ctx->ip_offset));
4192 }
4193 }
4194
4195 res = stack_push (ctx);
4196 set_stack_value (ctx, res, type, TRUE);
4197 if (ctx->prefix_set & PREFIX_READONLY) {
4198 ctx->prefix_set &= ~PREFIX_READONLY;
4199 res->stype |= CMMP_MASK;
4200 }
4201
4202 res->stype |= SAFE_BYREF_MASK;
4203 }
4204
4205 /*
4206 * FIXME handle arrays that are not 0-indexed
4207 * FIXME handle readonly prefix and CMMP
4208 */
4209 static void
do_ldelem(VerifyContext * ctx,int opcode,int token)4210 do_ldelem (VerifyContext *ctx, int opcode, int token)
4211 {
4212 #define IS_ONE_OF2(T, A, B) (T == A || T == B)
4213 ILStackDesc *index, *array;
4214 MonoType *type;
4215 if (!check_underflow (ctx, 2))
4216 return;
4217
4218 if (opcode == CEE_LDELEM) {
4219 if (!(type = verifier_load_type (ctx, token, "ldelem.any"))) {
4220 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Type (0x%08x) not found at 0x%04x", token, ctx->ip_offset));
4221 return;
4222 }
4223 } else {
4224 type = mono_type_from_opcode (opcode);
4225 }
4226
4227 index = stack_pop (ctx);
4228 array = stack_pop (ctx);
4229
4230 if (stack_slot_get_type (index) != TYPE_I4 && stack_slot_get_type (index) != TYPE_NATIVE_INT)
4231 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Index type(%s) for ldelem.X is not an int or a native int at 0x%04x", stack_slot_get_name (index), ctx->ip_offset));
4232
4233 if (!stack_slot_is_null_literal (array)) {
4234 if (stack_slot_get_type (array) != TYPE_COMPLEX || array->type->type != MONO_TYPE_SZARRAY)
4235 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type(%s) for ldelem.X at 0x%04x", stack_slot_get_name (array), ctx->ip_offset));
4236 else {
4237 if (opcode == CEE_LDELEM_REF) {
4238 if (array->type->data.klass->valuetype)
4239 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type is not a reference type for ldelem.ref 0x%04x", ctx->ip_offset));
4240 type = &array->type->data.klass->byval_arg;
4241 } else {
4242 MonoType *candidate = &array->type->data.klass->byval_arg;
4243 if (IS_STRICT_MODE (ctx)) {
4244 MonoType *underlying_type = mono_type_get_underlying_type_any (type);
4245 MonoType *underlying_candidate = mono_type_get_underlying_type_any (candidate);
4246 if ((IS_ONE_OF2 (underlying_type->type, MONO_TYPE_I4, MONO_TYPE_U4) && IS_ONE_OF2 (underlying_candidate->type, MONO_TYPE_I, MONO_TYPE_U)) ||
4247 (IS_ONE_OF2 (underlying_candidate->type, MONO_TYPE_I4, MONO_TYPE_U4) && IS_ONE_OF2 (underlying_type->type, MONO_TYPE_I, MONO_TYPE_U)))
4248 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type on stack for ldelem.X at 0x%04x", ctx->ip_offset));
4249 }
4250 if (!verify_type_compatibility_full (ctx, type, candidate, TRUE))
4251 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type on stack for ldelem.X at 0x%04x", ctx->ip_offset));
4252 }
4253 }
4254 }
4255
4256 set_stack_value (ctx, stack_push (ctx), type, FALSE);
4257 #undef IS_ONE_OF2
4258 }
4259
4260 /*
4261 * FIXME handle arrays that are not 0-indexed
4262 */
4263 static void
do_stelem(VerifyContext * ctx,int opcode,int token)4264 do_stelem (VerifyContext *ctx, int opcode, int token)
4265 {
4266 ILStackDesc *index, *array, *value;
4267 MonoType *type;
4268 if (!check_underflow (ctx, 3))
4269 return;
4270
4271 if (opcode == CEE_STELEM) {
4272 if (!(type = verifier_load_type (ctx, token, "stelem.any"))) {
4273 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Type (0x%08x) not found at 0x%04x", token, ctx->ip_offset));
4274 return;
4275 }
4276 } else {
4277 type = mono_type_from_opcode (opcode);
4278 }
4279
4280 value = stack_pop (ctx);
4281 index = stack_pop (ctx);
4282 array = stack_pop (ctx);
4283
4284 if (stack_slot_get_type (index) != TYPE_I4 && stack_slot_get_type (index) != TYPE_NATIVE_INT)
4285 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Index type(%s) for stdelem.X is not an int or a native int at 0x%04x", stack_slot_get_name (index), ctx->ip_offset));
4286
4287 if (!stack_slot_is_null_literal (array)) {
4288 if (stack_slot_get_type (array) != TYPE_COMPLEX || array->type->type != MONO_TYPE_SZARRAY) {
4289 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type(%s) for stelem.X at 0x%04x", stack_slot_get_name (array), ctx->ip_offset));
4290 } else {
4291 if (opcode == CEE_STELEM_REF) {
4292 if (array->type->data.klass->valuetype)
4293 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type is not a reference type for stelem.ref 0x%04x", ctx->ip_offset));
4294 } else if (!verify_type_compatibility_full (ctx, &array->type->data.klass->byval_arg, type, TRUE)) {
4295 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid array type on stack for stdelem.X at 0x%04x", ctx->ip_offset));
4296 }
4297 }
4298 }
4299 if (opcode == CEE_STELEM_REF) {
4300 if (!stack_slot_is_boxed_value (value) && mono_class_from_mono_type (value->type)->valuetype)
4301 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value is not a reference type for stelem.ref 0x%04x", ctx->ip_offset));
4302 } else if (opcode != CEE_STELEM_REF) {
4303 if (!verify_stack_type_compatibility (ctx, type, value))
4304 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid value on stack for stdelem.X at 0x%04x", ctx->ip_offset));
4305
4306 if (stack_slot_is_boxed_value (value) && !MONO_TYPE_IS_REFERENCE (value->type) && !MONO_TYPE_IS_REFERENCE (type))
4307 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use stobj with a boxed source value that is not a reference type at 0x%04x", ctx->ip_offset));
4308
4309 }
4310 }
4311
4312 static void
do_throw(VerifyContext * ctx)4313 do_throw (VerifyContext *ctx)
4314 {
4315 ILStackDesc *exception;
4316 if (!check_underflow (ctx, 1))
4317 return;
4318 exception = stack_pop (ctx);
4319
4320 if (!stack_slot_is_null_literal (exception) && !(stack_slot_get_type (exception) == TYPE_COMPLEX && !mono_class_from_mono_type (exception->type)->valuetype))
4321 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type on stack for throw, expected reference type at 0x%04x", ctx->ip_offset));
4322
4323 if (mono_type_is_generic_argument (exception->type) && !stack_slot_is_boxed_value (exception)) {
4324 char *name = mono_type_full_name (exception->type);
4325 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid type on stack for throw, expected reference type but found unboxed %s at 0x%04x ", name, ctx->ip_offset));
4326 g_free (name);
4327 }
4328 /*The stack is left empty after a throw*/
4329 ctx->eval.size = 0;
4330 }
4331
4332
4333 static void
do_endfilter(VerifyContext * ctx)4334 do_endfilter (VerifyContext *ctx)
4335 {
4336 MonoExceptionClause *clause;
4337
4338 if (IS_STRICT_MODE (ctx)) {
4339 if (ctx->eval.size != 1)
4340 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Stack size must have one item for endfilter at 0x%04x", ctx->ip_offset));
4341
4342 if (ctx->eval.size >= 1 && stack_slot_get_type (stack_pop (ctx)) != TYPE_I4)
4343 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Stack item type is not an int32 for endfilter at 0x%04x", ctx->ip_offset));
4344 }
4345
4346 if ((clause = is_correct_endfilter (ctx, ctx->ip_offset))) {
4347 if (IS_STRICT_MODE (ctx)) {
4348 if (ctx->ip_offset != clause->handler_offset - 2)
4349 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("endfilter is not the last instruction of the filter clause at 0x%04x", ctx->ip_offset));
4350 } else {
4351 if ((ctx->ip_offset != clause->handler_offset - 2) && !MONO_OFFSET_IN_HANDLER (clause, ctx->ip_offset))
4352 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("endfilter is not the last instruction of the filter clause at 0x%04x", ctx->ip_offset));
4353 }
4354 } else {
4355 if (IS_STRICT_MODE (ctx) && !is_unverifiable_endfilter (ctx, ctx->ip_offset))
4356 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("endfilter outside filter clause at 0x%04x", ctx->ip_offset));
4357 else
4358 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("endfilter outside filter clause at 0x%04x", ctx->ip_offset));
4359 }
4360
4361 ctx->eval.size = 0;
4362 }
4363
4364 static void
do_leave(VerifyContext * ctx,int delta)4365 do_leave (VerifyContext *ctx, int delta)
4366 {
4367 int target = ((gint32)ctx->ip_offset) + delta;
4368 if (target >= ctx->code_size || target < 0)
4369 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target out of code at 0x%04x", ctx->ip_offset));
4370
4371 if (!is_correct_leave (ctx->header, ctx->ip_offset, target))
4372 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Leave not allowed in finally block at 0x%04x", ctx->ip_offset));
4373 ctx->eval.size = 0;
4374 ctx->target = target;
4375 }
4376
4377 /*
4378 * do_static_branch:
4379 *
4380 * Verify br and br.s opcodes.
4381 */
4382 static void
do_static_branch(VerifyContext * ctx,int delta)4383 do_static_branch (VerifyContext *ctx, int delta)
4384 {
4385 int target = ctx->ip_offset + delta;
4386 if (target < 0 || target >= ctx->code_size) {
4387 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("branch target out of code at 0x%04x", ctx->ip_offset));
4388 return;
4389 }
4390
4391 switch (is_valid_branch_instruction (ctx->header, ctx->ip_offset, target)) {
4392 case 1:
4393 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
4394 break;
4395 case 2:
4396 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Branch target escapes out of exception block at 0x%04x", ctx->ip_offset));
4397 break;
4398 }
4399
4400 ctx->target = target;
4401 }
4402
4403 static void
do_switch(VerifyContext * ctx,int count,const unsigned char * data)4404 do_switch (VerifyContext *ctx, int count, const unsigned char *data)
4405 {
4406 int i, base = ctx->ip_offset + 5 + count * 4;
4407 ILStackDesc *value;
4408
4409 if (!check_underflow (ctx, 1))
4410 return;
4411
4412 value = stack_pop (ctx);
4413
4414 if (stack_slot_get_type (value) != TYPE_I4 && stack_slot_get_type (value) != TYPE_NATIVE_INT)
4415 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid argument to switch at 0x%04x", ctx->ip_offset));
4416
4417 for (i = 0; i < count; ++i) {
4418 int target = base + read32 (data + i * 4);
4419
4420 if (target < 0 || target >= ctx->code_size) {
4421 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Switch target %x out of code at 0x%04x", i, ctx->ip_offset));
4422 return;
4423 }
4424
4425 switch (is_valid_branch_instruction (ctx->header, ctx->ip_offset, target)) {
4426 case 1:
4427 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Switch target %x escapes out of exception block at 0x%04x", i, ctx->ip_offset));
4428 break;
4429 case 2:
4430 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Switch target %x escapes out of exception block at 0x%04x", i, ctx->ip_offset));
4431 return;
4432 }
4433 merge_stacks (ctx, &ctx->eval, &ctx->code [target], FALSE, TRUE);
4434 }
4435 }
4436
4437 static void
do_load_function_ptr(VerifyContext * ctx,guint32 token,gboolean virtual_)4438 do_load_function_ptr (VerifyContext *ctx, guint32 token, gboolean virtual_)
4439 {
4440 ILStackDesc *top;
4441 MonoMethod *method;
4442
4443 if (virtual_ && !check_underflow (ctx, 1))
4444 return;
4445
4446 if (!virtual_ && !check_overflow (ctx))
4447 return;
4448
4449 if (ctx->method->wrapper_type != MONO_WRAPPER_NONE) {
4450 method = (MonoMethod *)mono_method_get_wrapper_data (ctx->method, (guint32)token);
4451 if (!method) {
4452 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid token %x for ldftn at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
4453 return;
4454 }
4455 } else {
4456 if (!IS_METHOD_DEF_OR_REF_OR_SPEC (token) || !token_bounds_check (ctx->image, token)) {
4457 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid token %x for ldftn at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
4458 return;
4459 }
4460
4461 if (!(method = verifier_load_method (ctx, token, virtual_ ? "ldvirtfrn" : "ldftn")))
4462 return;
4463 }
4464
4465 if (mono_method_is_constructor (method))
4466 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use ldftn with a constructor at 0x%04x", ctx->ip_offset));
4467
4468 if (virtual_) {
4469 ILStackDesc *top = stack_pop (ctx);
4470
4471 if (stack_slot_get_type (top) != TYPE_COMPLEX || top->type->type == MONO_TYPE_VALUETYPE)
4472 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Invalid argument to ldvirtftn at 0x%04x", ctx->ip_offset));
4473
4474 if (method->flags & METHOD_ATTRIBUTE_STATIC)
4475 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use ldvirtftn with a constructor at 0x%04x", ctx->ip_offset));
4476
4477 if (!verify_stack_type_compatibility (ctx, &method->klass->byval_arg, top))
4478 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Unexpected object for ldvirtftn at 0x%04x", ctx->ip_offset));
4479 }
4480
4481 if (!IS_SKIP_VISIBILITY (ctx) && !mono_method_can_access_method_full (ctx->method, method, NULL))
4482 CODE_NOT_VERIFIABLE2 (ctx, g_strdup_printf ("Loaded method is not visible for ldftn/ldvirtftn at 0x%04x", ctx->ip_offset), MONO_EXCEPTION_METHOD_ACCESS);
4483
4484 top = stack_push_val(ctx, TYPE_PTR, mono_type_create_fnptr_from_mono_method (ctx, method));
4485 top->method = method;
4486 }
4487
4488 static void
do_sizeof(VerifyContext * ctx,int token)4489 do_sizeof (VerifyContext *ctx, int token)
4490 {
4491 MonoType *type;
4492
4493 if (!(type = verifier_load_type (ctx, token, "sizeof")))
4494 return;
4495
4496 if (type->byref && type->type != MONO_TYPE_TYPEDBYREF) {
4497 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid use of byref type at 0x%04x", ctx->ip_offset));
4498 return;
4499 }
4500
4501 if (type->type == MONO_TYPE_VOID) {
4502 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Invalid use of void type at 0x%04x", ctx->ip_offset));
4503 return;
4504 }
4505
4506 if (check_overflow (ctx))
4507 set_stack_value (ctx, stack_push (ctx), &mono_defaults.uint32_class->byval_arg, FALSE);
4508 }
4509
4510 /* Stack top can be of any type, the runtime doesn't care and treat everything as an int. */
4511 static void
do_localloc(VerifyContext * ctx)4512 do_localloc (VerifyContext *ctx)
4513 {
4514 if (ctx->eval.size != 1) {
4515 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Stack must have only size item in localloc at 0x%04x", ctx->ip_offset));
4516 return;
4517 }
4518
4519 if (in_any_exception_block (ctx->header, ctx->ip_offset)) {
4520 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Stack must have only size item in localloc at 0x%04x", ctx->ip_offset));
4521 return;
4522 }
4523
4524 /*TODO verify top type*/
4525 /* top = */ stack_pop (ctx);
4526
4527 set_stack_value (ctx, stack_push (ctx), &mono_defaults.int_class->byval_arg, FALSE);
4528 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Instruction localloc in never verifiable at 0x%04x", ctx->ip_offset));
4529 }
4530
4531 static void
do_ldstr(VerifyContext * ctx,guint32 token)4532 do_ldstr (VerifyContext *ctx, guint32 token)
4533 {
4534 GSList *error = NULL;
4535 if (ctx->method->wrapper_type == MONO_WRAPPER_NONE && !image_is_dynamic (ctx->image)) {
4536 if (mono_metadata_token_code (token) != MONO_TOKEN_STRING) {
4537 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid string token %x at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
4538 return;
4539 }
4540
4541 if (!mono_verifier_verify_string_signature (ctx->image, mono_metadata_token_index (token), &error)) {
4542 if (error)
4543 ctx->list = g_slist_concat (ctx->list, error);
4544 ADD_VERIFY_ERROR2 (ctx, g_strdup_printf ("Invalid string index %x at 0x%04x", token, ctx->ip_offset), MONO_EXCEPTION_BAD_IMAGE);
4545 return;
4546 }
4547 }
4548
4549 if (check_overflow (ctx))
4550 stack_push_val (ctx, TYPE_COMPLEX, &mono_defaults.string_class->byval_arg);
4551 }
4552
4553 static void
do_refanyval(VerifyContext * ctx,int token)4554 do_refanyval (VerifyContext *ctx, int token)
4555 {
4556 ILStackDesc *top;
4557 MonoType *type;
4558 if (!check_underflow (ctx, 1))
4559 return;
4560
4561 if (!(type = get_boxable_mono_type (ctx, token, "refanyval")))
4562 return;
4563
4564 top = stack_pop (ctx);
4565
4566 if (top->stype != TYPE_PTR || top->type->type != MONO_TYPE_TYPEDBYREF)
4567 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Expected a typedref as argument for refanyval, but found %s at 0x%04x", stack_slot_get_name (top), ctx->ip_offset));
4568
4569 set_stack_value (ctx, stack_push (ctx), type, TRUE);
4570 }
4571
4572 static void
do_refanytype(VerifyContext * ctx)4573 do_refanytype (VerifyContext *ctx)
4574 {
4575 ILStackDesc *top;
4576
4577 if (!check_underflow (ctx, 1))
4578 return;
4579
4580 top = stack_pop (ctx);
4581
4582 if (top->stype != TYPE_PTR || top->type->type != MONO_TYPE_TYPEDBYREF)
4583 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Expected a typedref as argument for refanytype, but found %s at 0x%04x", stack_slot_get_name (top), ctx->ip_offset));
4584
4585 set_stack_value (ctx, stack_push (ctx), &mono_defaults.typehandle_class->byval_arg, FALSE);
4586
4587 }
4588
4589 static void
do_mkrefany(VerifyContext * ctx,int token)4590 do_mkrefany (VerifyContext *ctx, int token)
4591 {
4592 ILStackDesc *top;
4593 MonoType *type;
4594 if (!check_underflow (ctx, 1))
4595 return;
4596
4597 if (!(type = get_boxable_mono_type (ctx, token, "refanyval")))
4598 return;
4599
4600 top = stack_pop (ctx);
4601
4602 if (stack_slot_is_managed_mutability_pointer (top))
4603 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot use a readonly pointer with mkrefany at 0x%04x", ctx->ip_offset));
4604
4605 if (!stack_slot_is_managed_pointer (top)) {
4606 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Expected a managed pointer for mkrefany, but found %s at 0x%04x", stack_slot_get_name (top), ctx->ip_offset));
4607 }else {
4608 MonoType *stack_type = mono_type_get_type_byval (top->type);
4609 if (MONO_TYPE_IS_REFERENCE (type) && !mono_metadata_type_equal (type, stack_type))
4610 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type not compatible for mkrefany at 0x%04x", ctx->ip_offset));
4611
4612 if (!MONO_TYPE_IS_REFERENCE (type) && !verify_type_compatibility_full (ctx, type, stack_type, TRUE))
4613 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Type not compatible for mkrefany at 0x%04x", ctx->ip_offset));
4614 }
4615
4616 set_stack_value (ctx, stack_push (ctx), &mono_defaults.typed_reference_class->byval_arg, FALSE);
4617 }
4618
4619 static void
do_ckfinite(VerifyContext * ctx)4620 do_ckfinite (VerifyContext *ctx)
4621 {
4622 ILStackDesc *top;
4623 if (!check_underflow (ctx, 1))
4624 return;
4625
4626 top = stack_pop (ctx);
4627
4628 if (stack_slot_get_underlying_type (top) != TYPE_R8)
4629 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Expected float32 or float64 on stack for ckfinit but found %s at 0x%04x", stack_slot_get_name (top), ctx->ip_offset));
4630 stack_push_stack_val (ctx, top);
4631 }
4632 /*
4633 * merge_stacks:
4634 * Merge the stacks and perform compat checks. The merge check if types of @from are mergeable with type of @to
4635 *
4636 * @from holds new values for a given control path
4637 * @to holds the current values of a given control path
4638 *
4639 * TODO we can eliminate the from argument as all callers pass &ctx->eval
4640 */
4641 static void
merge_stacks(VerifyContext * ctx,ILCodeDesc * from,ILCodeDesc * to,gboolean start,gboolean external)4642 merge_stacks (VerifyContext *ctx, ILCodeDesc *from, ILCodeDesc *to, gboolean start, gboolean external)
4643 {
4644 MonoError error;
4645 int i, j;
4646 stack_init (ctx, to);
4647
4648 if (start) {
4649 if (to->flags == IL_CODE_FLAG_NOT_PROCESSED)
4650 from->size = 0;
4651 else
4652 stack_copy (&ctx->eval, to);
4653 goto end_verify;
4654 } else if (!(to->flags & IL_CODE_STACK_MERGED)) {
4655 stack_copy (to, &ctx->eval);
4656 goto end_verify;
4657 }
4658 VERIFIER_DEBUG ( printf ("performing stack merge %d x %d\n", from->size, to->size); );
4659
4660 if (from->size != to->size) {
4661 VERIFIER_DEBUG ( printf ("different stack sizes %d x %d at 0x%04x\n", from->size, to->size, ctx->ip_offset); );
4662 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Could not merge stacks, different sizes (%d x %d) at 0x%04x", from->size, to->size, ctx->ip_offset));
4663 goto end_verify;
4664 }
4665
4666 //FIXME we need to preserve CMMP attributes
4667 //FIXME we must take null literals into consideration.
4668 for (i = 0; i < from->size; ++i) {
4669 ILStackDesc *new_slot = from->stack + i;
4670 ILStackDesc *old_slot = to->stack + i;
4671 MonoType *new_type = mono_type_from_stack_slot (new_slot);
4672 MonoType *old_type = mono_type_from_stack_slot (old_slot);
4673 MonoClass *old_class = mono_class_from_mono_type (old_type);
4674 MonoClass *new_class = mono_class_from_mono_type (new_type);
4675 MonoClass *match_class = NULL;
4676
4677 // check for safe byref before the next steps override new_slot
4678 if (stack_slot_is_safe_byref (old_slot) ^ stack_slot_is_safe_byref (new_slot)) {
4679 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot merge stack at depth %d byref types are safe byref incompatible at %0x04x ", i, ctx->ip_offset));
4680 goto end_verify;
4681 }
4682
4683 // S := T then U = S (new value is compatible with current value, keep current)
4684 if (verify_stack_type_compatibility (ctx, old_type, new_slot)) {
4685 copy_stack_value (new_slot, old_slot);
4686 continue;
4687 }
4688
4689 // T := S then U = T (old value is compatible with current value, use new)
4690 if (verify_stack_type_compatibility (ctx, new_type, old_slot)) {
4691 copy_stack_value (old_slot, new_slot);
4692 continue;
4693 }
4694
4695 /*Both slots are the same boxed valuetype. Simply copy it.*/
4696 if (stack_slot_is_boxed_value (old_slot) &&
4697 stack_slot_is_boxed_value (new_slot) &&
4698 mono_metadata_type_equal (old_type, new_type)) {
4699 copy_stack_value (new_slot, old_slot);
4700 continue;
4701 }
4702
4703 if (mono_type_is_generic_argument (old_type) || mono_type_is_generic_argument (new_type)) {
4704 char *old_name = stack_slot_full_name (old_slot);
4705 char *new_name = stack_slot_full_name (new_slot);
4706 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Could not merge stack at depth %d, types not compatible: %s X %s at 0x%04x", i, old_name, new_name, ctx->ip_offset));
4707 g_free (old_name);
4708 g_free (new_name);
4709 goto end_verify;
4710 }
4711
4712 //both are reference types, use closest common super type
4713 if (!mono_class_from_mono_type (old_type)->valuetype
4714 && !mono_class_from_mono_type (new_type)->valuetype
4715 && !stack_slot_is_managed_pointer (old_slot)
4716 && !stack_slot_is_managed_pointer (new_slot)) {
4717
4718 mono_class_setup_supertypes (old_class);
4719 mono_class_setup_supertypes (new_class);
4720
4721 for (j = MIN (old_class->idepth, new_class->idepth) - 1; j > 0; --j) {
4722 if (mono_metadata_type_equal (&old_class->supertypes [j]->byval_arg, &new_class->supertypes [j]->byval_arg)) {
4723 match_class = old_class->supertypes [j];
4724 goto match_found;
4725 }
4726 }
4727
4728 mono_class_setup_interfaces (old_class, &error);
4729 if (!mono_error_ok (&error)) {
4730 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot merge stacks due to a TypeLoadException %s at 0x%04x", mono_error_get_message (&error), ctx->ip_offset));
4731 mono_error_cleanup (&error);
4732 goto end_verify;
4733 }
4734 mono_class_setup_interfaces (new_class, &error);
4735 if (!mono_error_ok (&error)) {
4736 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Cannot merge stacks due to a TypeLoadException %s at 0x%04x", mono_error_get_message (&error), ctx->ip_offset));
4737 mono_error_cleanup (&error);
4738 goto end_verify;
4739 }
4740
4741 /* if old class is an interface that new class implements */
4742 if (mono_class_is_interface (old_class)) {
4743 if (verifier_class_is_assignable_from (old_class, new_class)) {
4744 match_class = old_class;
4745 goto match_found;
4746 }
4747 for (j = 0; j < old_class->interface_count; ++j) {
4748 if (verifier_class_is_assignable_from (old_class->interfaces [j], new_class)) {
4749 match_class = old_class->interfaces [j];
4750 goto match_found;
4751 }
4752 }
4753 }
4754
4755 if (mono_class_is_interface (new_class)) {
4756 if (verifier_class_is_assignable_from (new_class, old_class)) {
4757 match_class = new_class;
4758 goto match_found;
4759 }
4760 for (j = 0; j < new_class->interface_count; ++j) {
4761 if (verifier_class_is_assignable_from (new_class->interfaces [j], old_class)) {
4762 match_class = new_class->interfaces [j];
4763 goto match_found;
4764 }
4765 }
4766 }
4767
4768 //No decent super type found, use object
4769 match_class = mono_defaults.object_class;
4770 goto match_found;
4771 } else if (is_compatible_boxed_valuetype (ctx,old_type, new_type, new_slot, FALSE) || is_compatible_boxed_valuetype (ctx, new_type, old_type, old_slot, FALSE)) {
4772 match_class = mono_defaults.object_class;
4773 goto match_found;
4774 }
4775
4776 {
4777 char *old_name = stack_slot_full_name (old_slot);
4778 char *new_name = stack_slot_full_name (new_slot);
4779 CODE_NOT_VERIFIABLE (ctx, g_strdup_printf ("Could not merge stack at depth %d, types not compatible: %s X %s at 0x%04x", i, old_name, new_name, ctx->ip_offset));
4780 g_free (old_name);
4781 g_free (new_name);
4782 }
4783 set_stack_value (ctx, old_slot, &new_class->byval_arg, stack_slot_is_managed_pointer (old_slot));
4784 goto end_verify;
4785
4786 match_found:
4787 g_assert (match_class);
4788 set_stack_value (ctx, old_slot, &match_class->byval_arg, stack_slot_is_managed_pointer (old_slot));
4789 set_stack_value (ctx, new_slot, &match_class->byval_arg, stack_slot_is_managed_pointer (old_slot));
4790 continue;
4791 }
4792
4793 end_verify:
4794 if (external)
4795 to->flags |= IL_CODE_FLAG_WAS_TARGET;
4796 to->flags |= IL_CODE_STACK_MERGED;
4797 }
4798
4799 #define HANDLER_START(clause) ((clause)->flags == MONO_EXCEPTION_CLAUSE_FILTER ? (clause)->data.filter_offset : clause->handler_offset)
4800 #define IS_CATCH_OR_FILTER(clause) ((clause)->flags == MONO_EXCEPTION_CLAUSE_FILTER || (clause)->flags == MONO_EXCEPTION_CLAUSE_NONE)
4801
4802 /**
4803 * is_clause_in_range :
4804 *
4805 * Returns TRUE if either the protected block or the handler of @clause is in the @start - @end range.
4806 */
4807 static gboolean
is_clause_in_range(MonoExceptionClause * clause,guint32 start,guint32 end)4808 is_clause_in_range (MonoExceptionClause *clause, guint32 start, guint32 end)
4809 {
4810 if (clause->try_offset >= start && clause->try_offset < end)
4811 return TRUE;
4812 if (HANDLER_START (clause) >= start && HANDLER_START (clause) < end)
4813 return TRUE;
4814 return FALSE;
4815 }
4816
4817 /**
4818 * is_clause_inside_range :
4819 *
4820 * Returns TRUE if @clause lies completely inside the @start - @end range.
4821 */
4822 static gboolean
is_clause_inside_range(MonoExceptionClause * clause,guint32 start,guint32 end)4823 is_clause_inside_range (MonoExceptionClause *clause, guint32 start, guint32 end)
4824 {
4825 if (clause->try_offset < start || (clause->try_offset + clause->try_len) > end)
4826 return FALSE;
4827 if (HANDLER_START (clause) < start || (clause->handler_offset + clause->handler_len) > end)
4828 return FALSE;
4829 return TRUE;
4830 }
4831
4832 /**
4833 * is_clause_nested :
4834 *
4835 * Returns TRUE if @nested is nested in @clause.
4836 */
4837 static gboolean
is_clause_nested(MonoExceptionClause * clause,MonoExceptionClause * nested)4838 is_clause_nested (MonoExceptionClause *clause, MonoExceptionClause *nested)
4839 {
4840 if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER && is_clause_inside_range (nested, clause->data.filter_offset, clause->handler_offset))
4841 return TRUE;
4842 return is_clause_inside_range (nested, clause->try_offset, clause->try_offset + clause->try_len) ||
4843 is_clause_inside_range (nested, clause->handler_offset, clause->handler_offset + clause->handler_len);
4844 }
4845
4846 /* Test the relationship between 2 exception clauses. Follow P.1 12.4.2.7 of ECMA
4847 * the each pair of exception must have the following properties:
4848 * - one is fully nested on another (the outer must not be a filter clause) (the nested one must come earlier)
4849 * - completely disjoin (none of the 3 regions of each entry overlap with the other 3)
4850 * - mutual protection (protected block is EXACT the same, handlers are disjoin and all handler are catch or all handler are filter)
4851 */
4852 static void
verify_clause_relationship(VerifyContext * ctx,MonoExceptionClause * clause,MonoExceptionClause * to_test)4853 verify_clause_relationship (VerifyContext *ctx, MonoExceptionClause *clause, MonoExceptionClause *to_test)
4854 {
4855 /*clause is nested*/
4856 if (to_test->flags == MONO_EXCEPTION_CLAUSE_FILTER && is_clause_inside_range (clause, to_test->data.filter_offset, to_test->handler_offset)) {
4857 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Exception clause inside filter"));
4858 return;
4859 }
4860
4861 /*wrong nesting order.*/
4862 if (is_clause_nested (clause, to_test)) {
4863 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Nested exception clause appears after enclosing clause"));
4864 return;
4865 }
4866
4867 /*mutual protection*/
4868 if (clause->try_offset == to_test->try_offset && clause->try_len == to_test->try_len) {
4869 /*handlers are not disjoint*/
4870 if (is_clause_in_range (to_test, HANDLER_START (clause), clause->handler_offset + clause->handler_len)) {
4871 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Exception handlers overlap"));
4872 return;
4873 }
4874 /* handlers are not catch or filter */
4875 if (!IS_CATCH_OR_FILTER (clause) || !IS_CATCH_OR_FILTER (to_test)) {
4876 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Exception clauses with shared protected block are neither catch or filter"));
4877 return;
4878 }
4879 /*OK*/
4880 return;
4881 }
4882
4883 /*not completelly disjoint*/
4884 if ((is_clause_in_range (to_test, clause->try_offset, clause->try_offset + clause->try_len) ||
4885 is_clause_in_range (to_test, HANDLER_START (clause), clause->handler_offset + clause->handler_len)) && !is_clause_nested (to_test, clause))
4886 ADD_VERIFY_ERROR (ctx, g_strdup_printf ("Exception clauses overlap"));
4887 }
4888
4889 #define code_bounds_check(size) \
4890 if (ADDP_IS_GREATER_OR_OVF (ip, size, end)) {\
4891 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Code overrun starting with 0x%x at 0x%04x", *ip, ctx.ip_offset)); \
4892 break; \
4893 } \
4894
4895 static gboolean
mono_opcode_is_prefix(int op)4896 mono_opcode_is_prefix (int op)
4897 {
4898 switch (op) {
4899 case MONO_CEE_UNALIGNED_:
4900 case MONO_CEE_VOLATILE_:
4901 case MONO_CEE_TAIL_:
4902 case MONO_CEE_CONSTRAINED_:
4903 case MONO_CEE_READONLY_:
4904 return TRUE;
4905 }
4906 return FALSE;
4907 }
4908
4909 /*
4910 * FIXME: need to distinguish between valid and verifiable.
4911 * Need to keep track of types on the stack.
4912 */
4913
4914 /**
4915 * mono_method_verify:
4916 * Verify types for opcodes.
4917 */
4918 GSList*
mono_method_verify(MonoMethod * method,int level)4919 mono_method_verify (MonoMethod *method, int level)
4920 {
4921 MonoError error;
4922 const unsigned char *ip, *code_start;
4923 const unsigned char *end;
4924 MonoSimpleBasicBlock *bb = NULL, *original_bb = NULL;
4925
4926 int i, n, need_merge = 0, start = 0;
4927 guint ip_offset = 0, prefix = 0;
4928 MonoGenericContext *generic_context = NULL;
4929 MonoImage *image;
4930 VerifyContext ctx;
4931 GSList *tmp;
4932 VERIFIER_DEBUG ( printf ("Verify IL for method %s %s %s\n", method->klass->name_space, method->klass->name, method->name); );
4933
4934 init_verifier_stats ();
4935
4936 if (method->iflags & (METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL | METHOD_IMPL_ATTRIBUTE_RUNTIME) ||
4937 (method->flags & (METHOD_ATTRIBUTE_PINVOKE_IMPL | METHOD_ATTRIBUTE_ABSTRACT))) {
4938 return NULL;
4939 }
4940
4941 memset (&ctx, 0, sizeof (VerifyContext));
4942
4943 //FIXME use mono_method_get_signature_full
4944 ctx.signature = mono_method_signature (method);
4945 if (!ctx.signature) {
4946 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Could not decode method signature"));
4947
4948 finish_collect_stats ();
4949 return ctx.list;
4950 }
4951 if (!method->is_generic && !mono_class_is_gtd (method->klass) && ctx.signature->has_type_parameters) {
4952 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Method and signature don't match in terms of genericity"));
4953 finish_collect_stats ();
4954 return ctx.list;
4955 }
4956
4957 ctx.header = mono_method_get_header_checked (method, &error);
4958 if (!ctx.header) {
4959 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Could not decode method header due to %s", mono_error_get_message (&error)));
4960 mono_error_cleanup (&error);
4961 finish_collect_stats ();
4962 return ctx.list;
4963 }
4964 ctx.method = method;
4965 code_start = ip = ctx.header->code;
4966 end = ip + ctx.header->code_size;
4967 ctx.image = image = method->klass->image;
4968
4969
4970 ctx.max_args = ctx.signature->param_count + ctx.signature->hasthis;
4971 ctx.max_stack = ctx.header->max_stack;
4972 ctx.verifiable = ctx.valid = 1;
4973 ctx.level = level;
4974
4975 ctx.code = g_new (ILCodeDesc, ctx.header->code_size);
4976 ctx.code_size = ctx.header->code_size;
4977 _MEM_ALLOC (sizeof (ILCodeDesc) * ctx.header->code_size);
4978
4979 memset(ctx.code, 0, sizeof (ILCodeDesc) * ctx.header->code_size);
4980
4981 ctx.num_locals = ctx.header->num_locals;
4982 ctx.locals = (MonoType **)g_memdup (ctx.header->locals, sizeof (MonoType*) * ctx.header->num_locals);
4983 _MEM_ALLOC (sizeof (MonoType*) * ctx.header->num_locals);
4984 ctx.locals_verification_state = g_new0 (char, ctx.num_locals);
4985
4986 if (ctx.num_locals > 0 && !ctx.header->init_locals)
4987 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Method with locals variable but without init locals set"));
4988
4989 ctx.params = g_new (MonoType*, ctx.max_args);
4990 _MEM_ALLOC (sizeof (MonoType*) * ctx.max_args);
4991
4992 if (ctx.signature->hasthis)
4993 ctx.params [0] = method->klass->valuetype ? &method->klass->this_arg : &method->klass->byval_arg;
4994 memcpy (ctx.params + ctx.signature->hasthis, ctx.signature->params, sizeof (MonoType *) * ctx.signature->param_count);
4995
4996 if (ctx.signature->is_inflated)
4997 ctx.generic_context = generic_context = mono_method_get_context (method);
4998
4999 if (!generic_context && (mono_class_is_gtd (method->klass) || method->is_generic)) {
5000 if (method->is_generic)
5001 ctx.generic_context = generic_context = &(mono_method_get_generic_container (method)->context);
5002 else
5003 ctx.generic_context = generic_context = &mono_class_get_generic_container (method->klass)->context;
5004 }
5005
5006 for (i = 0; i < ctx.num_locals; ++i) {
5007 MonoType *uninflated = ctx.locals [i];
5008 ctx.locals [i] = mono_class_inflate_generic_type_checked (ctx.locals [i], ctx.generic_context, &error);
5009 if (!mono_error_ok (&error)) {
5010 char *name = mono_type_full_name (ctx.locals [i] ? ctx.locals [i] : uninflated);
5011 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid local %d of type %s", i, name));
5012 g_free (name);
5013 mono_error_cleanup (&error);
5014 /* we must not free (in cleanup) what was not yet allocated (but only copied) */
5015 ctx.num_locals = i;
5016 ctx.max_args = 0;
5017 goto cleanup;
5018 }
5019 }
5020 for (i = 0; i < ctx.max_args; ++i) {
5021 MonoType *uninflated = ctx.params [i];
5022 ctx.params [i] = mono_class_inflate_generic_type_checked (ctx.params [i], ctx.generic_context, &error);
5023 if (!mono_error_ok (&error)) {
5024 char *name = mono_type_full_name (ctx.params [i] ? ctx.params [i] : uninflated);
5025 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid parameter %d of type %s", i, name));
5026 g_free (name);
5027 mono_error_cleanup (&error);
5028 /* we must not free (in cleanup) what was not yet allocated (but only copied) */
5029 ctx.max_args = i;
5030 goto cleanup;
5031 }
5032 }
5033 stack_init (&ctx, &ctx.eval);
5034
5035 for (i = 0; i < ctx.num_locals; ++i) {
5036 if (!mono_type_is_valid_in_context (&ctx, ctx.locals [i]))
5037 break;
5038 if (get_stack_type (ctx.locals [i]) == TYPE_INV) {
5039 char *name = mono_type_full_name (ctx.locals [i]);
5040 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid local %i of type %s", i, name));
5041 g_free (name);
5042 break;
5043 }
5044
5045 }
5046
5047 for (i = 0; i < ctx.max_args; ++i) {
5048 if (!mono_type_is_valid_in_context (&ctx, ctx.params [i]))
5049 break;
5050
5051 if (get_stack_type (ctx.params [i]) == TYPE_INV) {
5052 char *name = mono_type_full_name (ctx.params [i]);
5053 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid parameter %i of type %s", i, name));
5054 g_free (name);
5055 break;
5056 }
5057 }
5058
5059 if (!ctx.valid)
5060 goto cleanup;
5061
5062 for (i = 0; i < ctx.header->num_clauses && ctx.valid; ++i) {
5063 MonoExceptionClause *clause = ctx.header->clauses + i;
5064 VERIFIER_DEBUG (printf ("clause try %x len %x filter at %x handler at %x len %x\n", clause->try_offset, clause->try_len, clause->data.filter_offset, clause->handler_offset, clause->handler_len); );
5065
5066 if (clause->try_offset > ctx.code_size || ADD_IS_GREATER_OR_OVF (clause->try_offset, clause->try_len, ctx.code_size))
5067 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("try clause out of bounds at 0x%04x", clause->try_offset));
5068
5069 if (clause->try_len <= 0)
5070 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("try clause len <= 0 at 0x%04x", clause->try_offset));
5071
5072 if (clause->handler_offset > ctx.code_size || ADD_IS_GREATER_OR_OVF (clause->handler_offset, clause->handler_len, ctx.code_size))
5073 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("handler clause out of bounds at 0x%04x", clause->try_offset));
5074
5075 if (clause->handler_len <= 0)
5076 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("handler clause len <= 0 at 0x%04x", clause->try_offset));
5077
5078 if (clause->try_offset < clause->handler_offset && ADD_IS_GREATER_OR_OVF (clause->try_offset, clause->try_len, HANDLER_START (clause)))
5079 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("try block (at 0x%04x) includes handler block (at 0x%04x)", clause->try_offset, clause->handler_offset));
5080
5081 if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
5082 if (clause->data.filter_offset > ctx.code_size)
5083 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("filter clause out of bounds at 0x%04x", clause->try_offset));
5084
5085 if (clause->data.filter_offset >= clause->handler_offset)
5086 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("filter clause must come before the handler clause at 0x%04x", clause->data.filter_offset));
5087 }
5088
5089 for (n = i + 1; n < ctx.header->num_clauses && ctx.valid; ++n)
5090 verify_clause_relationship (&ctx, clause, ctx.header->clauses + n);
5091
5092 if (!ctx.valid)
5093 break;
5094
5095 ctx.code [clause->try_offset].flags |= IL_CODE_FLAG_WAS_TARGET;
5096 if (clause->try_offset + clause->try_len < ctx.code_size)
5097 ctx.code [clause->try_offset + clause->try_len].flags |= IL_CODE_FLAG_WAS_TARGET;
5098 if (clause->handler_offset + clause->handler_len < ctx.code_size)
5099 ctx.code [clause->handler_offset + clause->handler_len].flags |= IL_CODE_FLAG_WAS_TARGET;
5100
5101 if (clause->flags == MONO_EXCEPTION_CLAUSE_NONE) {
5102 if (!clause->data.catch_class) {
5103 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Catch clause %d with invalid type", i));
5104 break;
5105 }
5106 if (!mono_type_is_valid_in_context (&ctx, &clause->data.catch_class->byval_arg))
5107 break;
5108
5109 init_stack_with_value_at_exception_boundary (&ctx, ctx.code + clause->handler_offset, clause->data.catch_class);
5110 }
5111 else if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
5112 init_stack_with_value_at_exception_boundary (&ctx, ctx.code + clause->data.filter_offset, mono_defaults.exception_class);
5113 init_stack_with_value_at_exception_boundary (&ctx, ctx.code + clause->handler_offset, mono_defaults.exception_class);
5114 }
5115 }
5116
5117 if (!ctx.valid)
5118 goto cleanup;
5119
5120 original_bb = bb = mono_basic_block_split (method, &error, ctx.header);
5121 if (!mono_error_ok (&error)) {
5122 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid branch target: %s", mono_error_get_message (&error)));
5123 mono_error_cleanup (&error);
5124 goto cleanup;
5125 }
5126 g_assert (bb);
5127
5128 while (ip < end && ctx.valid) {
5129 int op_size;
5130 ip_offset = (guint) (ip - code_start);
5131 {
5132 const unsigned char *ip_copy = ip;
5133 int op;
5134
5135 if (ip_offset > bb->end) {
5136 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Branch or EH block at [0x%04x] targets middle instruction at 0x%04x", bb->end, ip_offset));
5137 goto cleanup;
5138 }
5139
5140 if (ip_offset == bb->end)
5141 bb = bb->next;
5142
5143 op_size = mono_opcode_value_and_size (&ip_copy, end, &op);
5144 if (op_size == -1) {
5145 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction %x at 0x%04x", *ip, ip_offset));
5146 goto cleanup;
5147 }
5148
5149 if (ADD_IS_GREATER_OR_OVF (ip_offset, op_size, bb->end)) {
5150 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Branch or EH block targets middle of instruction at 0x%04x", ip_offset));
5151 goto cleanup;
5152 }
5153
5154 /*Last Instruction*/
5155 if (ip_offset + op_size == bb->end && mono_opcode_is_prefix (op)) {
5156 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Branch or EH block targets between prefix '%s' and instruction at 0x%04x", mono_opcode_name (op), ip_offset));
5157 goto cleanup;
5158 }
5159 }
5160
5161 ctx.ip_offset = ip_offset = (guint) (ip - code_start);
5162
5163 /*We need to check against fallthrou in and out of protected blocks.
5164 * For fallout we check the once a protected block ends, if the start flag is not set.
5165 * Likewise for fallthru in, we check if ip is the start of a protected block and start is not set
5166 * TODO convert these checks to be done using flags and not this loop
5167 */
5168 for (i = 0; i < ctx.header->num_clauses && ctx.valid; ++i) {
5169 MonoExceptionClause *clause = ctx.header->clauses + i;
5170
5171 if ((clause->try_offset + clause->try_len == ip_offset) && start == 0) {
5172 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("fallthru off try block at 0x%04x", ip_offset));
5173 start = 1;
5174 }
5175
5176 if ((clause->handler_offset + clause->handler_len == ip_offset) && start == 0) {
5177 if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER)
5178 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("fallout of handler block at 0x%04x", ip_offset));
5179 else
5180 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("fallout of handler block at 0x%04x", ip_offset));
5181 start = 1;
5182 }
5183
5184 if (clause->flags == MONO_EXCEPTION_CLAUSE_FILTER && clause->handler_offset == ip_offset && start == 0) {
5185 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("fallout of filter block at 0x%04x", ip_offset));
5186 start = 1;
5187 }
5188
5189 if (clause->handler_offset == ip_offset && start == 0) {
5190 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("fallthru handler block at 0x%04x", ip_offset));
5191 start = 1;
5192 }
5193
5194 if (clause->try_offset == ip_offset && ctx.eval.size > 0 && start == 0) {
5195 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Try to enter try block with a non-empty stack at 0x%04x", ip_offset));
5196 start = 1;
5197 }
5198 }
5199
5200 /*This must be done after fallthru detection otherwise it won't happen.*/
5201 if (bb->dead) {
5202 /*FIXME remove this once we move all bad branch checking code to use BB only*/
5203 ctx.code [ip_offset].flags |= IL_CODE_FLAG_SEEN;
5204 ip += op_size;
5205 continue;
5206 }
5207
5208 if (!ctx.valid)
5209 break;
5210
5211 if (need_merge) {
5212 VERIFIER_DEBUG ( printf ("extra merge needed! 0x%04x \n", ctx.target); );
5213 merge_stacks (&ctx, &ctx.eval, &ctx.code [ctx.target], FALSE, TRUE);
5214 need_merge = 0;
5215 }
5216 merge_stacks (&ctx, &ctx.eval, &ctx.code[ip_offset], start, FALSE);
5217 start = 0;
5218
5219 /*TODO we can fast detect a forward branch or exception block targeting code after prefix, we should fail fast*/
5220 #ifdef MONO_VERIFIER_DEBUG
5221 {
5222 char *discode;
5223 discode = mono_disasm_code_one (NULL, method, ip, NULL);
5224 discode [strlen (discode) - 1] = 0; /* no \n */
5225 g_print ("[%d] %-29s (%d)\n", ip_offset, discode, ctx.eval.size);
5226 g_free (discode);
5227 }
5228 dump_stack_state (&ctx.code [ip_offset]);
5229 dump_stack_state (&ctx.eval);
5230 #endif
5231
5232 switch (*ip) {
5233 case CEE_NOP:
5234 case CEE_BREAK:
5235 ++ip;
5236 break;
5237
5238 case CEE_LDARG_0:
5239 case CEE_LDARG_1:
5240 case CEE_LDARG_2:
5241 case CEE_LDARG_3:
5242 push_arg (&ctx, *ip - CEE_LDARG_0, FALSE);
5243 ++ip;
5244 break;
5245
5246 case CEE_LDARG_S:
5247 case CEE_LDARGA_S:
5248 code_bounds_check (2);
5249 push_arg (&ctx, ip [1], *ip == CEE_LDARGA_S);
5250 ip += 2;
5251 break;
5252
5253 case CEE_ADD_OVF_UN:
5254 do_binop (&ctx, *ip, add_ovf_un_table);
5255 ++ip;
5256 break;
5257
5258 case CEE_SUB_OVF_UN:
5259 do_binop (&ctx, *ip, sub_ovf_un_table);
5260 ++ip;
5261 break;
5262
5263 case CEE_ADD_OVF:
5264 case CEE_SUB_OVF:
5265 case CEE_MUL_OVF:
5266 case CEE_MUL_OVF_UN:
5267 do_binop (&ctx, *ip, bin_ovf_table);
5268 ++ip;
5269 break;
5270
5271 case CEE_ADD:
5272 do_binop (&ctx, *ip, add_table);
5273 ++ip;
5274 break;
5275
5276 case CEE_SUB:
5277 do_binop (&ctx, *ip, sub_table);
5278 ++ip;
5279 break;
5280
5281 case CEE_MUL:
5282 case CEE_DIV:
5283 case CEE_REM:
5284 do_binop (&ctx, *ip, bin_op_table);
5285 ++ip;
5286 break;
5287
5288 case CEE_AND:
5289 case CEE_DIV_UN:
5290 case CEE_OR:
5291 case CEE_REM_UN:
5292 case CEE_XOR:
5293 do_binop (&ctx, *ip, int_bin_op_table);
5294 ++ip;
5295 break;
5296
5297 case CEE_SHL:
5298 case CEE_SHR:
5299 case CEE_SHR_UN:
5300 do_binop (&ctx, *ip, shift_op_table);
5301 ++ip;
5302 break;
5303
5304 case CEE_POP:
5305 if (!check_underflow (&ctx, 1))
5306 break;
5307 stack_pop_safe (&ctx);
5308 ++ip;
5309 break;
5310
5311 case CEE_RET:
5312 do_ret (&ctx);
5313 ++ip;
5314 start = 1;
5315 break;
5316
5317 case CEE_LDLOC_0:
5318 case CEE_LDLOC_1:
5319 case CEE_LDLOC_2:
5320 case CEE_LDLOC_3:
5321 /*TODO support definite assignment verification? */
5322 push_local (&ctx, *ip - CEE_LDLOC_0, FALSE);
5323 ++ip;
5324 break;
5325
5326 case CEE_STLOC_0:
5327 case CEE_STLOC_1:
5328 case CEE_STLOC_2:
5329 case CEE_STLOC_3:
5330 store_local (&ctx, *ip - CEE_STLOC_0);
5331 ++ip;
5332 break;
5333
5334 case CEE_STLOC_S:
5335 code_bounds_check (2);
5336 store_local (&ctx, ip [1]);
5337 ip += 2;
5338 break;
5339
5340 case CEE_STARG_S:
5341 code_bounds_check (2);
5342 store_arg (&ctx, ip [1]);
5343 ip += 2;
5344 break;
5345
5346 case CEE_LDC_I4_M1:
5347 case CEE_LDC_I4_0:
5348 case CEE_LDC_I4_1:
5349 case CEE_LDC_I4_2:
5350 case CEE_LDC_I4_3:
5351 case CEE_LDC_I4_4:
5352 case CEE_LDC_I4_5:
5353 case CEE_LDC_I4_6:
5354 case CEE_LDC_I4_7:
5355 case CEE_LDC_I4_8:
5356 if (check_overflow (&ctx))
5357 stack_push_val (&ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
5358 ++ip;
5359 break;
5360
5361 case CEE_LDC_I4_S:
5362 code_bounds_check (2);
5363 if (check_overflow (&ctx))
5364 stack_push_val (&ctx, TYPE_I4, &mono_defaults.int32_class->byval_arg);
5365 ip += 2;
5366 break;
5367
5368 case CEE_LDC_I4:
5369 code_bounds_check (5);
5370 if (check_overflow (&ctx))
5371 stack_push_val (&ctx,TYPE_I4, &mono_defaults.int32_class->byval_arg);
5372 ip += 5;
5373 break;
5374
5375 case CEE_LDC_I8:
5376 code_bounds_check (9);
5377 if (check_overflow (&ctx))
5378 stack_push_val (&ctx,TYPE_I8, &mono_defaults.int64_class->byval_arg);
5379 ip += 9;
5380 break;
5381
5382 case CEE_LDC_R4:
5383 code_bounds_check (5);
5384 if (check_overflow (&ctx))
5385 stack_push_val (&ctx, TYPE_R8, &mono_defaults.double_class->byval_arg);
5386 ip += 5;
5387 break;
5388
5389 case CEE_LDC_R8:
5390 code_bounds_check (9);
5391 if (check_overflow (&ctx))
5392 stack_push_val (&ctx, TYPE_R8, &mono_defaults.double_class->byval_arg);
5393 ip += 9;
5394 break;
5395
5396 case CEE_LDNULL:
5397 if (check_overflow (&ctx))
5398 stack_push_val (&ctx, TYPE_COMPLEX | NULL_LITERAL_MASK, &mono_defaults.object_class->byval_arg);
5399 ++ip;
5400 break;
5401
5402 case CEE_BEQ_S:
5403 case CEE_BNE_UN_S:
5404 code_bounds_check (2);
5405 do_branch_op (&ctx, (signed char)ip [1] + 2, cmp_br_eq_op);
5406 ip += 2;
5407 need_merge = 1;
5408 break;
5409
5410 case CEE_BGE_S:
5411 case CEE_BGT_S:
5412 case CEE_BLE_S:
5413 case CEE_BLT_S:
5414 case CEE_BGE_UN_S:
5415 case CEE_BGT_UN_S:
5416 case CEE_BLE_UN_S:
5417 case CEE_BLT_UN_S:
5418 code_bounds_check (2);
5419 do_branch_op (&ctx, (signed char)ip [1] + 2, cmp_br_op);
5420 ip += 2;
5421 need_merge = 1;
5422 break;
5423
5424 case CEE_BEQ:
5425 case CEE_BNE_UN:
5426 code_bounds_check (5);
5427 do_branch_op (&ctx, (gint32)read32 (ip + 1) + 5, cmp_br_eq_op);
5428 ip += 5;
5429 need_merge = 1;
5430 break;
5431
5432 case CEE_BGE:
5433 case CEE_BGT:
5434 case CEE_BLE:
5435 case CEE_BLT:
5436 case CEE_BGE_UN:
5437 case CEE_BGT_UN:
5438 case CEE_BLE_UN:
5439 case CEE_BLT_UN:
5440 code_bounds_check (5);
5441 do_branch_op (&ctx, (gint32)read32 (ip + 1) + 5, cmp_br_op);
5442 ip += 5;
5443 need_merge = 1;
5444 break;
5445
5446 case CEE_LDLOC_S:
5447 case CEE_LDLOCA_S:
5448 code_bounds_check (2);
5449 push_local (&ctx, ip[1], *ip == CEE_LDLOCA_S);
5450 ip += 2;
5451 break;
5452
5453 case CEE_UNUSED99:
5454 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Use of the `unused' opcode"));
5455 ++ip;
5456 break;
5457
5458 case CEE_DUP: {
5459 ILStackDesc *top;
5460 if (!check_underflow (&ctx, 1))
5461 break;
5462 if (!check_overflow (&ctx))
5463 break;
5464 top = stack_push (&ctx);
5465 copy_stack_value (top, stack_peek (&ctx, 1));
5466 ++ip;
5467 break;
5468 }
5469
5470 case CEE_JMP:
5471 code_bounds_check (5);
5472 if (ctx.eval.size)
5473 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Eval stack must be empty in jmp at 0x%04x", ip_offset));
5474 /* token = read32 (ip + 1); */
5475 if (in_any_block (ctx.header, ip_offset))
5476 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("jmp cannot escape exception blocks at 0x%04x", ip_offset));
5477
5478 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Intruction jmp is not verifiable at 0x%04x", ctx.ip_offset));
5479 /*
5480 * FIXME: check signature, retval, arguments etc.
5481 */
5482 ip += 5;
5483 break;
5484 case CEE_CALL:
5485 case CEE_CALLVIRT:
5486 code_bounds_check (5);
5487 do_invoke_method (&ctx, read32 (ip + 1), *ip == CEE_CALLVIRT);
5488 ip += 5;
5489 break;
5490
5491 case CEE_CALLI:
5492 code_bounds_check (5);
5493 /* token = read32 (ip + 1); */
5494 /*
5495 * FIXME: check signature, retval, arguments etc.
5496 * FIXME: check requirements for tail call
5497 */
5498 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Intruction calli is not verifiable at 0x%04x", ctx.ip_offset));
5499 ip += 5;
5500 break;
5501 case CEE_BR_S:
5502 code_bounds_check (2);
5503 do_static_branch (&ctx, (signed char)ip [1] + 2);
5504 need_merge = 1;
5505 ip += 2;
5506 start = 1;
5507 break;
5508
5509 case CEE_BRFALSE_S:
5510 case CEE_BRTRUE_S:
5511 code_bounds_check (2);
5512 do_boolean_branch_op (&ctx, (signed char)ip [1] + 2);
5513 ip += 2;
5514 need_merge = 1;
5515 break;
5516
5517 case CEE_BR:
5518 code_bounds_check (5);
5519 do_static_branch (&ctx, (gint32)read32 (ip + 1) + 5);
5520 need_merge = 1;
5521 ip += 5;
5522 start = 1;
5523 break;
5524
5525 case CEE_BRFALSE:
5526 case CEE_BRTRUE:
5527 code_bounds_check (5);
5528 do_boolean_branch_op (&ctx, (gint32)read32 (ip + 1) + 5);
5529 ip += 5;
5530 need_merge = 1;
5531 break;
5532
5533 case CEE_SWITCH: {
5534 guint32 entries;
5535 code_bounds_check (5);
5536 entries = read32 (ip + 1);
5537
5538 if (entries > 0xFFFFFFFFU / sizeof (guint32))
5539 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Too many switch entries %x at 0x%04x", entries, ctx.ip_offset));
5540
5541 ip += 5;
5542 code_bounds_check (sizeof (guint32) * entries);
5543
5544 do_switch (&ctx, entries, ip);
5545 ip += sizeof (guint32) * entries;
5546 break;
5547 }
5548 case CEE_LDIND_I1:
5549 case CEE_LDIND_U1:
5550 case CEE_LDIND_I2:
5551 case CEE_LDIND_U2:
5552 case CEE_LDIND_I4:
5553 case CEE_LDIND_U4:
5554 case CEE_LDIND_I8:
5555 case CEE_LDIND_I:
5556 case CEE_LDIND_R4:
5557 case CEE_LDIND_R8:
5558 case CEE_LDIND_REF:
5559 do_load_indirect (&ctx, *ip);
5560 ++ip;
5561 break;
5562
5563 case CEE_STIND_REF:
5564 case CEE_STIND_I1:
5565 case CEE_STIND_I2:
5566 case CEE_STIND_I4:
5567 case CEE_STIND_I8:
5568 case CEE_STIND_R4:
5569 case CEE_STIND_R8:
5570 case CEE_STIND_I:
5571 do_store_indirect (&ctx, *ip);
5572 ++ip;
5573 break;
5574
5575 case CEE_NOT:
5576 case CEE_NEG:
5577 do_unary_math_op (&ctx, *ip);
5578 ++ip;
5579 break;
5580
5581 case CEE_CONV_I1:
5582 case CEE_CONV_I2:
5583 case CEE_CONV_I4:
5584 case CEE_CONV_U1:
5585 case CEE_CONV_U2:
5586 case CEE_CONV_U4:
5587 do_conversion (&ctx, TYPE_I4);
5588 ++ip;
5589 break;
5590
5591 case CEE_CONV_I8:
5592 case CEE_CONV_U8:
5593 do_conversion (&ctx, TYPE_I8);
5594 ++ip;
5595 break;
5596
5597 case CEE_CONV_R4:
5598 case CEE_CONV_R8:
5599 case CEE_CONV_R_UN:
5600 do_conversion (&ctx, TYPE_R8);
5601 ++ip;
5602 break;
5603
5604 case CEE_CONV_I:
5605 case CEE_CONV_U:
5606 do_conversion (&ctx, TYPE_NATIVE_INT);
5607 ++ip;
5608 break;
5609
5610 case CEE_CPOBJ:
5611 code_bounds_check (5);
5612 do_cpobj (&ctx, read32 (ip + 1));
5613 ip += 5;
5614 break;
5615
5616 case CEE_LDOBJ:
5617 code_bounds_check (5);
5618 do_ldobj_value (&ctx, read32 (ip + 1));
5619 ip += 5;
5620 break;
5621
5622 case CEE_LDSTR:
5623 code_bounds_check (5);
5624 do_ldstr (&ctx, read32 (ip + 1));
5625 ip += 5;
5626 break;
5627
5628 case CEE_NEWOBJ:
5629 code_bounds_check (5);
5630 do_newobj (&ctx, read32 (ip + 1));
5631 ip += 5;
5632 break;
5633
5634 case CEE_CASTCLASS:
5635 case CEE_ISINST:
5636 code_bounds_check (5);
5637 do_cast (&ctx, read32 (ip + 1), *ip == CEE_CASTCLASS ? "castclass" : "isinst");
5638 ip += 5;
5639 break;
5640
5641 case CEE_UNUSED58:
5642 case CEE_UNUSED1:
5643 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Use of the `unused' opcode"));
5644 ++ip;
5645 break;
5646
5647 case CEE_UNBOX:
5648 code_bounds_check (5);
5649 do_unbox_value (&ctx, read32 (ip + 1));
5650 ip += 5;
5651 break;
5652
5653 case CEE_THROW:
5654 do_throw (&ctx);
5655 start = 1;
5656 ++ip;
5657 break;
5658
5659 case CEE_LDFLD:
5660 case CEE_LDFLDA:
5661 code_bounds_check (5);
5662 do_push_field (&ctx, read32 (ip + 1), *ip == CEE_LDFLDA);
5663 ip += 5;
5664 break;
5665
5666 case CEE_LDSFLD:
5667 case CEE_LDSFLDA:
5668 code_bounds_check (5);
5669 do_push_static_field (&ctx, read32 (ip + 1), *ip == CEE_LDSFLDA);
5670 ip += 5;
5671 break;
5672
5673 case CEE_STFLD:
5674 code_bounds_check (5);
5675 do_store_field (&ctx, read32 (ip + 1));
5676 ip += 5;
5677 break;
5678
5679 case CEE_STSFLD:
5680 code_bounds_check (5);
5681 do_store_static_field (&ctx, read32 (ip + 1));
5682 ip += 5;
5683 break;
5684
5685 case CEE_STOBJ:
5686 code_bounds_check (5);
5687 do_stobj (&ctx, read32 (ip + 1));
5688 ip += 5;
5689 break;
5690
5691 case CEE_CONV_OVF_I1_UN:
5692 case CEE_CONV_OVF_I2_UN:
5693 case CEE_CONV_OVF_I4_UN:
5694 case CEE_CONV_OVF_U1_UN:
5695 case CEE_CONV_OVF_U2_UN:
5696 case CEE_CONV_OVF_U4_UN:
5697 do_conversion (&ctx, TYPE_I4);
5698 ++ip;
5699 break;
5700
5701 case CEE_CONV_OVF_I8_UN:
5702 case CEE_CONV_OVF_U8_UN:
5703 do_conversion (&ctx, TYPE_I8);
5704 ++ip;
5705 break;
5706
5707 case CEE_CONV_OVF_I_UN:
5708 case CEE_CONV_OVF_U_UN:
5709 do_conversion (&ctx, TYPE_NATIVE_INT);
5710 ++ip;
5711 break;
5712
5713 case CEE_BOX:
5714 code_bounds_check (5);
5715 do_box_value (&ctx, read32 (ip + 1));
5716 ip += 5;
5717 break;
5718
5719 case CEE_NEWARR:
5720 code_bounds_check (5);
5721 do_newarr (&ctx, read32 (ip + 1));
5722 ip += 5;
5723 break;
5724
5725 case CEE_LDLEN:
5726 do_ldlen (&ctx);
5727 ++ip;
5728 break;
5729
5730 case CEE_LDELEMA:
5731 code_bounds_check (5);
5732 do_ldelema (&ctx, read32 (ip + 1));
5733 ip += 5;
5734 break;
5735
5736 case CEE_LDELEM_I1:
5737 case CEE_LDELEM_U1:
5738 case CEE_LDELEM_I2:
5739 case CEE_LDELEM_U2:
5740 case CEE_LDELEM_I4:
5741 case CEE_LDELEM_U4:
5742 case CEE_LDELEM_I8:
5743 case CEE_LDELEM_I:
5744 case CEE_LDELEM_R4:
5745 case CEE_LDELEM_R8:
5746 case CEE_LDELEM_REF:
5747 do_ldelem (&ctx, *ip, 0);
5748 ++ip;
5749 break;
5750
5751 case CEE_STELEM_I:
5752 case CEE_STELEM_I1:
5753 case CEE_STELEM_I2:
5754 case CEE_STELEM_I4:
5755 case CEE_STELEM_I8:
5756 case CEE_STELEM_R4:
5757 case CEE_STELEM_R8:
5758 case CEE_STELEM_REF:
5759 do_stelem (&ctx, *ip, 0);
5760 ++ip;
5761 break;
5762
5763 case CEE_LDELEM:
5764 code_bounds_check (5);
5765 do_ldelem (&ctx, *ip, read32 (ip + 1));
5766 ip += 5;
5767 break;
5768
5769 case CEE_STELEM:
5770 code_bounds_check (5);
5771 do_stelem (&ctx, *ip, read32 (ip + 1));
5772 ip += 5;
5773 break;
5774
5775 case CEE_UNBOX_ANY:
5776 code_bounds_check (5);
5777 do_unbox_any (&ctx, read32 (ip + 1));
5778 ip += 5;
5779 break;
5780
5781 case CEE_CONV_OVF_I1:
5782 case CEE_CONV_OVF_U1:
5783 case CEE_CONV_OVF_I2:
5784 case CEE_CONV_OVF_U2:
5785 case CEE_CONV_OVF_I4:
5786 case CEE_CONV_OVF_U4:
5787 do_conversion (&ctx, TYPE_I4);
5788 ++ip;
5789 break;
5790
5791 case CEE_CONV_OVF_I8:
5792 case CEE_CONV_OVF_U8:
5793 do_conversion (&ctx, TYPE_I8);
5794 ++ip;
5795 break;
5796
5797 case CEE_CONV_OVF_I:
5798 case CEE_CONV_OVF_U:
5799 do_conversion (&ctx, TYPE_NATIVE_INT);
5800 ++ip;
5801 break;
5802
5803 case CEE_REFANYVAL:
5804 code_bounds_check (5);
5805 do_refanyval (&ctx, read32 (ip + 1));
5806 ip += 5;
5807 break;
5808
5809 case CEE_CKFINITE:
5810 do_ckfinite (&ctx);
5811 ++ip;
5812 break;
5813
5814 case CEE_MKREFANY:
5815 code_bounds_check (5);
5816 do_mkrefany (&ctx, read32 (ip + 1));
5817 ip += 5;
5818 break;
5819
5820 case CEE_LDTOKEN:
5821 code_bounds_check (5);
5822 do_load_token (&ctx, read32 (ip + 1));
5823 ip += 5;
5824 break;
5825
5826 case CEE_ENDFINALLY:
5827 if (!is_correct_endfinally (ctx.header, ip_offset))
5828 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("endfinally must be used inside a finally/fault handler at 0x%04x", ctx.ip_offset));
5829 ctx.eval.size = 0;
5830 start = 1;
5831 ++ip;
5832 break;
5833
5834 case CEE_LEAVE:
5835 code_bounds_check (5);
5836 do_leave (&ctx, read32 (ip + 1) + 5);
5837 ip += 5;
5838 start = 1;
5839 need_merge = 1;
5840 break;
5841
5842 case CEE_LEAVE_S:
5843 code_bounds_check (2);
5844 do_leave (&ctx, (signed char)ip [1] + 2);
5845 ip += 2;
5846 start = 1;
5847 need_merge = 1;
5848 break;
5849
5850 case CEE_PREFIX1:
5851 code_bounds_check (2);
5852 ++ip;
5853 switch (*ip) {
5854 case CEE_STLOC:
5855 code_bounds_check (3);
5856 store_local (&ctx, read16 (ip + 1));
5857 ip += 3;
5858 break;
5859
5860 case CEE_CEQ:
5861 do_cmp_op (&ctx, cmp_br_eq_op, *ip);
5862 ++ip;
5863 break;
5864
5865 case CEE_CGT:
5866 case CEE_CGT_UN:
5867 case CEE_CLT:
5868 case CEE_CLT_UN:
5869 do_cmp_op (&ctx, cmp_br_op, *ip);
5870 ++ip;
5871 break;
5872
5873 case CEE_STARG:
5874 code_bounds_check (3);
5875 store_arg (&ctx, read16 (ip + 1) );
5876 ip += 3;
5877 break;
5878
5879
5880 case CEE_ARGLIST:
5881 if (!check_overflow (&ctx))
5882 break;
5883 if (ctx.signature->call_convention != MONO_CALL_VARARG)
5884 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Cannot use arglist on method without VARGARG calling convention at 0x%04x", ctx.ip_offset));
5885 set_stack_value (&ctx, stack_push (&ctx), &mono_defaults.argumenthandle_class->byval_arg, FALSE);
5886 ++ip;
5887 break;
5888
5889 case CEE_LDFTN:
5890 code_bounds_check (5);
5891 do_load_function_ptr (&ctx, read32 (ip + 1), FALSE);
5892 ip += 5;
5893 break;
5894
5895 case CEE_LDVIRTFTN:
5896 code_bounds_check (5);
5897 do_load_function_ptr (&ctx, read32 (ip + 1), TRUE);
5898 ip += 5;
5899 break;
5900
5901 case CEE_LDARG:
5902 case CEE_LDARGA:
5903 code_bounds_check (3);
5904 push_arg (&ctx, read16 (ip + 1), *ip == CEE_LDARGA);
5905 ip += 3;
5906 break;
5907
5908 case CEE_LDLOC:
5909 case CEE_LDLOCA:
5910 code_bounds_check (3);
5911 push_local (&ctx, read16 (ip + 1), *ip == CEE_LDLOCA);
5912 ip += 3;
5913 break;
5914
5915 case CEE_LOCALLOC:
5916 do_localloc (&ctx);
5917 ++ip;
5918 break;
5919
5920 case CEE_UNUSED56:
5921 case CEE_UNUSED57:
5922 case CEE_UNUSED70:
5923 case CEE_UNUSED:
5924 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Use of the `unused' opcode"));
5925 ++ip;
5926 break;
5927 case CEE_ENDFILTER:
5928 do_endfilter (&ctx);
5929 start = 1;
5930 ++ip;
5931 break;
5932 case CEE_UNALIGNED_:
5933 code_bounds_check (2);
5934 prefix |= PREFIX_UNALIGNED;
5935 ip += 2;
5936 break;
5937 case CEE_VOLATILE_:
5938 prefix |= PREFIX_VOLATILE;
5939 ++ip;
5940 break;
5941 case CEE_TAIL_:
5942 prefix |= PREFIX_TAIL;
5943 ++ip;
5944 if (ip < end && (*ip != CEE_CALL && *ip != CEE_CALLI && *ip != CEE_CALLVIRT))
5945 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("tail prefix must be used only with call opcodes at 0x%04x", ip_offset));
5946 break;
5947
5948 case CEE_INITOBJ:
5949 code_bounds_check (5);
5950 do_initobj (&ctx, read32 (ip + 1));
5951 ip += 5;
5952 break;
5953
5954 case CEE_CONSTRAINED_:
5955 code_bounds_check (5);
5956 ctx.constrained_type = get_boxable_mono_type (&ctx, read32 (ip + 1), "constrained.");
5957 prefix |= PREFIX_CONSTRAINED;
5958 ip += 5;
5959 break;
5960
5961 case CEE_READONLY_:
5962 prefix |= PREFIX_READONLY;
5963 ip++;
5964 break;
5965
5966 case CEE_CPBLK:
5967 CLEAR_PREFIX (&ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
5968 if (!check_underflow (&ctx, 3))
5969 break;
5970 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Instruction cpblk is not verifiable at 0x%04x", ctx.ip_offset));
5971 ip++;
5972 break;
5973
5974 case CEE_INITBLK:
5975 CLEAR_PREFIX (&ctx, PREFIX_UNALIGNED | PREFIX_VOLATILE);
5976 if (!check_underflow (&ctx, 3))
5977 break;
5978 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Instruction initblk is not verifiable at 0x%04x", ctx.ip_offset));
5979 ip++;
5980 break;
5981
5982 case CEE_NO_:
5983 ip += 2;
5984 break;
5985 case CEE_RETHROW:
5986 if (!is_correct_rethrow (ctx.header, ip_offset))
5987 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("rethrow must be used inside a catch handler at 0x%04x", ctx.ip_offset));
5988 ctx.eval.size = 0;
5989 start = 1;
5990 ++ip;
5991 break;
5992
5993 case CEE_SIZEOF:
5994 code_bounds_check (5);
5995 do_sizeof (&ctx, read32 (ip + 1));
5996 ip += 5;
5997 break;
5998
5999 case CEE_REFANYTYPE:
6000 do_refanytype (&ctx);
6001 ++ip;
6002 break;
6003
6004 default:
6005 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction FE %x at 0x%04x", *ip, ctx.ip_offset));
6006 ++ip;
6007 }
6008 break;
6009
6010 default:
6011 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction %x at 0x%04x", *ip, ctx.ip_offset));
6012 ++ip;
6013 }
6014
6015 /*TODO we can fast detect a forward branch or exception block targeting code after prefix, we should fail fast*/
6016 if (prefix) {
6017 if (!ctx.prefix_set) //first prefix
6018 ctx.code [ctx.ip_offset].flags |= IL_CODE_FLAG_SEEN;
6019 ctx.prefix_set |= prefix;
6020 ctx.has_flags = TRUE;
6021 prefix = 0;
6022 } else {
6023 if (!ctx.has_flags)
6024 ctx.code [ctx.ip_offset].flags |= IL_CODE_FLAG_SEEN;
6025
6026 if (ctx.prefix_set & PREFIX_CONSTRAINED)
6027 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction after constrained prefix at 0x%04x", ctx.ip_offset));
6028 if (ctx.prefix_set & PREFIX_READONLY)
6029 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction after readonly prefix at 0x%04x", ctx.ip_offset));
6030 if (ctx.prefix_set & PREFIX_VOLATILE)
6031 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction after volatile prefix at 0x%04x", ctx.ip_offset));
6032 if (ctx.prefix_set & PREFIX_UNALIGNED)
6033 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Invalid instruction after unaligned prefix at 0x%04x", ctx.ip_offset));
6034 ctx.prefix_set = prefix = 0;
6035 ctx.has_flags = FALSE;
6036 }
6037 }
6038 /*
6039 * if ip != end we overflowed: mark as error.
6040 */
6041 if ((ip != end || !start) && ctx.verifiable && !ctx.list) {
6042 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Run ahead of method code at 0x%04x", ip_offset));
6043 }
6044
6045 /*We should guard against the last decoded opcode, otherwise we might add errors that doesn't make sense.*/
6046 for (i = 0; i < ctx.code_size && i < ip_offset; ++i) {
6047 if (ctx.code [i].flags & IL_CODE_FLAG_WAS_TARGET) {
6048 if (!(ctx.code [i].flags & IL_CODE_FLAG_SEEN))
6049 ADD_VERIFY_ERROR (&ctx, g_strdup_printf ("Branch or exception block target middle of instruction at 0x%04x", i));
6050
6051 if (ctx.code [i].flags & IL_CODE_DELEGATE_SEQUENCE)
6052 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Branch to delegate code sequence at 0x%04x", i));
6053 }
6054 if ((ctx.code [i].flags & IL_CODE_LDFTN_DELEGATE_NONFINAL_VIRTUAL) && ctx.has_this_store)
6055 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Invalid ldftn with virtual function in method with stdarg 0 at 0x%04x", i));
6056
6057 if ((ctx.code [i].flags & IL_CODE_CALL_NONFINAL_VIRTUAL) && ctx.has_this_store)
6058 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Invalid call to a non-final virtual function in method with stdarg.0 or ldarga.0 at 0x%04x", i));
6059 }
6060
6061 if (mono_method_is_constructor (ctx.method) && !ctx.super_ctor_called && !ctx.method->klass->valuetype && ctx.method->klass != mono_defaults.object_class) {
6062 char *method_name = mono_method_full_name (ctx.method, TRUE);
6063 char *type = mono_type_get_full_name (ctx.method->klass);
6064 if (ctx.method->klass->parent && mono_class_has_failure (ctx.method->klass->parent))
6065 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Constructor %s for type %s not calling base type ctor due to a TypeLoadException on base type.", method_name, type));
6066 else
6067 CODE_NOT_VERIFIABLE (&ctx, g_strdup_printf ("Constructor %s for type %s not calling base type ctor.", method_name, type));
6068 g_free (method_name);
6069 g_free (type);
6070 }
6071
6072 cleanup:
6073 if (ctx.code) {
6074 for (i = 0; i < ctx.header->code_size; ++i) {
6075 if (ctx.code [i].stack)
6076 g_free (ctx.code [i].stack);
6077 }
6078 }
6079
6080 for (tmp = ctx.funptrs; tmp; tmp = tmp->next)
6081 g_free (tmp->data);
6082 g_slist_free (ctx.funptrs);
6083
6084 for (tmp = ctx.exception_types; tmp; tmp = tmp->next)
6085 mono_metadata_free_type ((MonoType *)tmp->data);
6086 g_slist_free (ctx.exception_types);
6087
6088 for (i = 0; i < ctx.num_locals; ++i) {
6089 if (ctx.locals [i])
6090 mono_metadata_free_type (ctx.locals [i]);
6091 }
6092 for (i = 0; i < ctx.max_args; ++i) {
6093 if (ctx.params [i])
6094 mono_metadata_free_type (ctx.params [i]);
6095 }
6096
6097 if (ctx.eval.stack)
6098 g_free (ctx.eval.stack);
6099 if (ctx.code)
6100 g_free (ctx.code);
6101 g_free (ctx.locals);
6102 g_free (ctx.locals_verification_state);
6103 g_free (ctx.params);
6104 mono_basic_block_free (original_bb);
6105 mono_metadata_free_mh (ctx.header);
6106
6107 finish_collect_stats ();
6108 return ctx.list;
6109 }
6110
6111 char*
mono_verify_corlib()6112 mono_verify_corlib ()
6113 {
6114 /* This is a public API function so cannot be removed */
6115 return NULL;
6116 }
6117
6118 /**
6119 * mono_verifier_is_enabled_for_method:
6120 * \param method the method to probe
6121 * \returns TRUE if \p method needs to be verified.
6122 */
6123 gboolean
mono_verifier_is_enabled_for_method(MonoMethod * method)6124 mono_verifier_is_enabled_for_method (MonoMethod *method)
6125 {
6126 return mono_verifier_is_enabled_for_class (method->klass) && (method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD);
6127 }
6128
6129 /**
6130 * mono_verifier_is_enabled_for_class:
6131 * \param klass The \c MonoClass to probe
6132 * \returns TRUE if \p klass need to be verified.
6133 */
6134 gboolean
mono_verifier_is_enabled_for_class(MonoClass * klass)6135 mono_verifier_is_enabled_for_class (MonoClass *klass)
6136 {
6137 return verify_all || (verifier_mode > MONO_VERIFIER_MODE_OFF && !(klass->image->assembly && klass->image->assembly->in_gac) && klass->image != mono_defaults.corlib);
6138 }
6139
6140 gboolean
mono_verifier_is_enabled_for_image(MonoImage * image)6141 mono_verifier_is_enabled_for_image (MonoImage *image)
6142 {
6143 return verify_all || verifier_mode > MONO_VERIFIER_MODE_OFF;
6144 }
6145
6146 /*
6147 * Dynamic methods are not considered full trust since if the user is trusted and need to
6148 * generate unsafe code, make the method skip verification - this is a known good way to do it.
6149 */
6150 gboolean
mono_verifier_is_method_full_trust(MonoMethod * method)6151 mono_verifier_is_method_full_trust (MonoMethod *method)
6152 {
6153 return mono_verifier_is_class_full_trust (method->klass) && !method_is_dynamic (method);
6154 }
6155
6156 /*
6157 * Returns if @klass is under full trust or not.
6158 *
6159 * TODO This code doesn't take CAS into account.
6160 *
6161 * Under verify_all all user code must be verifiable if no security option was set
6162 *
6163 */
6164 gboolean
mono_verifier_is_class_full_trust(MonoClass * klass)6165 mono_verifier_is_class_full_trust (MonoClass *klass)
6166 {
6167 /* under CoreCLR code is trusted if it is part of the "platform" otherwise all code inside the GAC is trusted */
6168 gboolean trusted_location = !mono_security_core_clr_enabled () ?
6169 (klass->image->assembly && klass->image->assembly->in_gac) : mono_security_core_clr_is_platform_image (klass->image);
6170
6171 if (verify_all && verifier_mode == MONO_VERIFIER_MODE_OFF)
6172 return trusted_location || klass->image == mono_defaults.corlib;
6173 return verifier_mode < MONO_VERIFIER_MODE_VERIFIABLE || trusted_location || klass->image == mono_defaults.corlib;
6174 }
6175
6176 GSList*
mono_method_verify_with_current_settings(MonoMethod * method,gboolean skip_visibility,gboolean is_fulltrust)6177 mono_method_verify_with_current_settings (MonoMethod *method, gboolean skip_visibility, gboolean is_fulltrust)
6178 {
6179 return mono_method_verify (method,
6180 (verifier_mode != MONO_VERIFIER_MODE_STRICT ? MONO_VERIFY_NON_STRICT: 0)
6181 | (!is_fulltrust && !mono_verifier_is_method_full_trust (method) ? MONO_VERIFY_FAIL_FAST : 0)
6182 | (skip_visibility ? MONO_VERIFY_SKIP_VISIBILITY : 0));
6183 }
6184
6185 static int
get_field_end(MonoClassField * field)6186 get_field_end (MonoClassField *field)
6187 {
6188 int align;
6189 int size = mono_type_size (field->type, &align);
6190 if (size == 0)
6191 size = 4; /*FIXME Is this a safe bet?*/
6192 return size + field->offset;
6193 }
6194
6195 static gboolean
verify_class_for_overlapping_reference_fields(MonoClass * klass)6196 verify_class_for_overlapping_reference_fields (MonoClass *klass)
6197 {
6198 int i = 0, j;
6199 gpointer iter = NULL;
6200 MonoClassField *field;
6201 gboolean is_fulltrust = mono_verifier_is_class_full_trust (klass);
6202 /*We can't skip types with !has_references since this is calculated after we have run.*/
6203 if (!mono_class_is_explicit_layout (klass))
6204 return TRUE;
6205
6206
6207 /*We must check for stuff overlapping reference fields.
6208 The outer loop uses mono_class_get_fields to ensure that MonoClass:fields get inited.
6209 */
6210 while ((field = mono_class_get_fields (klass, &iter))) {
6211 int fieldEnd = get_field_end (field);
6212 gboolean is_valuetype = !MONO_TYPE_IS_REFERENCE (field->type);
6213 ++i;
6214
6215 if (mono_field_is_deleted (field) || (field->type->attrs & FIELD_ATTRIBUTE_STATIC))
6216 continue;
6217
6218 int fcount = mono_class_get_field_count (klass);
6219 for (j = i; j < fcount; ++j) {
6220 MonoClassField *other = &klass->fields [j];
6221 int otherEnd = get_field_end (other);
6222 if (mono_field_is_deleted (other) || (is_valuetype && !MONO_TYPE_IS_REFERENCE (other->type)) || (other->type->attrs & FIELD_ATTRIBUTE_STATIC))
6223 continue;
6224
6225 if (!is_valuetype && MONO_TYPE_IS_REFERENCE (other->type) && field->offset == other->offset && is_fulltrust)
6226 continue;
6227
6228 if ((otherEnd > field->offset && otherEnd <= fieldEnd) || (other->offset >= field->offset && other->offset < fieldEnd))
6229 return FALSE;
6230 }
6231 }
6232 return TRUE;
6233 }
6234
6235 static guint
field_hash(gconstpointer key)6236 field_hash (gconstpointer key)
6237 {
6238 const MonoClassField *field = (const MonoClassField *)key;
6239 return g_str_hash (field->name) ^ mono_metadata_type_hash (field->type); /**/
6240 }
6241
6242 static gboolean
field_equals(gconstpointer _a,gconstpointer _b)6243 field_equals (gconstpointer _a, gconstpointer _b)
6244 {
6245 const MonoClassField *a = (const MonoClassField *)_a;
6246 const MonoClassField *b = (const MonoClassField *)_b;
6247 return !strcmp (a->name, b->name) && mono_metadata_type_equal (a->type, b->type);
6248 }
6249
6250
6251 static gboolean
verify_class_fields(MonoClass * klass)6252 verify_class_fields (MonoClass *klass)
6253 {
6254 gpointer iter = NULL;
6255 MonoClassField *field;
6256 MonoGenericContext *context = mono_class_get_context (klass);
6257 GHashTable *unique_fields = g_hash_table_new_full (&field_hash, &field_equals, NULL, NULL);
6258 if (mono_class_is_gtd (klass))
6259 context = &mono_class_get_generic_container (klass)->context;
6260
6261 while ((field = mono_class_get_fields (klass, &iter)) != NULL) {
6262 if (!mono_type_is_valid_type_in_context (field->type, context)) {
6263 g_hash_table_destroy (unique_fields);
6264 return FALSE;
6265 }
6266 if (g_hash_table_lookup (unique_fields, field)) {
6267 g_hash_table_destroy (unique_fields);
6268 return FALSE;
6269 }
6270 g_hash_table_insert (unique_fields, field, field);
6271 }
6272 g_hash_table_destroy (unique_fields);
6273 return TRUE;
6274 }
6275
6276 static gboolean
verify_interfaces(MonoClass * klass)6277 verify_interfaces (MonoClass *klass)
6278 {
6279 int i;
6280 for (i = 0; i < klass->interface_count; ++i) {
6281 MonoClass *iface = klass->interfaces [i];
6282 if (!mono_class_get_flags (iface))
6283 return FALSE;
6284 }
6285 return TRUE;
6286 }
6287
6288 static gboolean
verify_valuetype_layout_with_target(MonoClass * klass,MonoClass * target_class)6289 verify_valuetype_layout_with_target (MonoClass *klass, MonoClass *target_class)
6290 {
6291 int type;
6292 gpointer iter = NULL;
6293 MonoClassField *field;
6294 MonoClass *field_class;
6295
6296 if (!klass->valuetype)
6297 return TRUE;
6298
6299 type = klass->byval_arg.type;
6300 /*primitive type fields are not properly decoded*/
6301 if ((type >= MONO_TYPE_BOOLEAN && type <= MONO_TYPE_R8) || (type >= MONO_TYPE_I && type <= MONO_TYPE_U))
6302 return TRUE;
6303
6304 while ((field = mono_class_get_fields (klass, &iter)) != NULL) {
6305 if (!field->type)
6306 return FALSE;
6307
6308 if (field->type->attrs & (FIELD_ATTRIBUTE_STATIC | FIELD_ATTRIBUTE_HAS_FIELD_RVA))
6309 continue;
6310
6311 field_class = mono_class_get_generic_type_definition (mono_class_from_mono_type (field->type));
6312
6313 if (field_class == target_class || klass == field_class || !verify_valuetype_layout_with_target (field_class, target_class))
6314 return FALSE;
6315 }
6316
6317 return TRUE;
6318 }
6319
6320 static gboolean
verify_valuetype_layout(MonoClass * klass)6321 verify_valuetype_layout (MonoClass *klass)
6322 {
6323 gboolean res;
6324 res = verify_valuetype_layout_with_target (klass, klass);
6325 return res;
6326 }
6327
6328 static gboolean
recursive_mark_constraint_args(MonoBitSet * used_args,MonoGenericContainer * gc,MonoType * type)6329 recursive_mark_constraint_args (MonoBitSet *used_args, MonoGenericContainer *gc, MonoType *type)
6330 {
6331 int idx;
6332 MonoClass **constraints;
6333 MonoGenericParamInfo *param_info;
6334
6335 g_assert (mono_type_is_generic_argument (type));
6336
6337 idx = mono_type_get_generic_param_num (type);
6338 if (mono_bitset_test_fast (used_args, idx))
6339 return FALSE;
6340
6341 mono_bitset_set_fast (used_args, idx);
6342 param_info = mono_generic_container_get_param_info (gc, idx);
6343
6344 if (!param_info->constraints)
6345 return TRUE;
6346
6347 for (constraints = param_info->constraints; *constraints; ++constraints) {
6348 MonoClass *ctr = *constraints;
6349 MonoType *constraint_type = &ctr->byval_arg;
6350
6351 if (mono_type_is_generic_argument (constraint_type) && !recursive_mark_constraint_args (used_args, gc, constraint_type))
6352 return FALSE;
6353 }
6354 return TRUE;
6355 }
6356
6357 static gboolean
verify_generic_parameters(MonoClass * klass)6358 verify_generic_parameters (MonoClass *klass)
6359 {
6360 int i;
6361 MonoGenericContainer *gc = mono_class_get_generic_container (klass);
6362 MonoBitSet *used_args = mono_bitset_new (gc->type_argc, 0);
6363
6364 for (i = 0; i < gc->type_argc; ++i) {
6365 MonoGenericParamInfo *param_info = mono_generic_container_get_param_info (gc, i);
6366 MonoClass **constraints;
6367
6368 if (!param_info->constraints)
6369 continue;
6370
6371 mono_bitset_clear_all (used_args);
6372 mono_bitset_set_fast (used_args, i);
6373
6374 for (constraints = param_info->constraints; *constraints; ++constraints) {
6375 MonoClass *ctr = *constraints;
6376 MonoType *constraint_type = &ctr->byval_arg;
6377
6378 if (!mono_class_can_access_class (klass, ctr))
6379 goto fail;
6380
6381 if (!mono_type_is_valid_type_in_context (constraint_type, &gc->context))
6382 goto fail;
6383
6384 if (mono_type_is_generic_argument (constraint_type) && !recursive_mark_constraint_args (used_args, gc, constraint_type))
6385 goto fail;
6386 if (mono_class_is_ginst (ctr) && !mono_class_is_valid_generic_instantiation (NULL, ctr))
6387 goto fail;
6388 }
6389 }
6390 mono_bitset_free (used_args);
6391 return TRUE;
6392
6393 fail:
6394 mono_bitset_free (used_args);
6395 return FALSE;
6396 }
6397
6398 /*
6399 * Check if the class is verifiable.
6400 *
6401 * Right now there are no conditions that make a class a valid but not verifiable. Both overlapping reference
6402 * field and invalid generic instantiation are fatal errors.
6403 *
6404 * This method must be safe to be called from mono_class_init and all code must be carefull about that.
6405 *
6406 */
6407 gboolean
mono_verifier_verify_class(MonoClass * klass)6408 mono_verifier_verify_class (MonoClass *klass)
6409 {
6410 /*Neither <Module>, object or ifaces have parent.*/
6411 if (!klass->parent &&
6412 klass != mono_defaults.object_class &&
6413 !MONO_CLASS_IS_INTERFACE (klass) &&
6414 (!image_is_dynamic (klass->image) && klass->type_token != 0x2000001)) /*<Module> is the first type in the assembly*/
6415 return FALSE;
6416 if (klass->parent) {
6417 if (MONO_CLASS_IS_INTERFACE (klass->parent))
6418 return FALSE;
6419 if (!mono_class_is_ginst (klass) && mono_class_is_gtd (klass->parent))
6420 return FALSE;
6421 if (mono_class_is_ginst (klass->parent) && !mono_class_is_ginst (klass)) {
6422 MonoGenericContext *context = mono_class_get_context (klass);
6423 if (mono_class_is_gtd (klass))
6424 context = &mono_class_get_generic_container (klass)->context;
6425 if (!mono_type_is_valid_type_in_context (&klass->parent->byval_arg, context))
6426 return FALSE;
6427 }
6428 }
6429 if (mono_class_is_gtd (klass) && (mono_class_is_explicit_layout (klass)))
6430 return FALSE;
6431 if (mono_class_is_gtd (klass) && !verify_generic_parameters (klass))
6432 return FALSE;
6433 if (!verify_class_for_overlapping_reference_fields (klass))
6434 return FALSE;
6435 if (mono_class_is_ginst (klass) && !mono_class_is_valid_generic_instantiation (NULL, klass))
6436 return FALSE;
6437 if (!mono_class_is_ginst (klass) && !verify_class_fields (klass))
6438 return FALSE;
6439 if (klass->valuetype && !verify_valuetype_layout (klass))
6440 return FALSE;
6441 if (!verify_interfaces (klass))
6442 return FALSE;
6443 return TRUE;
6444 }
6445
6446 gboolean
mono_verifier_class_is_valid_generic_instantiation(MonoClass * klass)6447 mono_verifier_class_is_valid_generic_instantiation (MonoClass *klass)
6448 {
6449 return mono_class_is_valid_generic_instantiation (NULL, klass);
6450 }
6451
6452 gboolean
mono_verifier_is_method_valid_generic_instantiation(MonoMethod * method)6453 mono_verifier_is_method_valid_generic_instantiation (MonoMethod *method)
6454 {
6455 if (!method->is_inflated)
6456 return TRUE;
6457 return mono_method_is_valid_generic_instantiation (NULL, method);
6458 }
6459
6460 #else
6461
6462 gboolean
mono_verifier_verify_class(MonoClass * klass)6463 mono_verifier_verify_class (MonoClass *klass)
6464 {
6465 /* The verifier was disabled at compile time */
6466 return TRUE;
6467 }
6468
6469 GSList*
mono_method_verify_with_current_settings(MonoMethod * method,gboolean skip_visibility,gboolean is_fulltrust)6470 mono_method_verify_with_current_settings (MonoMethod *method, gboolean skip_visibility, gboolean is_fulltrust)
6471 {
6472 /* The verifier was disabled at compile time */
6473 return NULL;
6474 }
6475
6476 gboolean
mono_verifier_is_class_full_trust(MonoClass * klass)6477 mono_verifier_is_class_full_trust (MonoClass *klass)
6478 {
6479 /* The verifier was disabled at compile time */
6480 return TRUE;
6481 }
6482
6483 gboolean
mono_verifier_is_method_full_trust(MonoMethod * method)6484 mono_verifier_is_method_full_trust (MonoMethod *method)
6485 {
6486 /* The verifier was disabled at compile time */
6487 return TRUE;
6488 }
6489
6490 gboolean
mono_verifier_is_enabled_for_image(MonoImage * image)6491 mono_verifier_is_enabled_for_image (MonoImage *image)
6492 {
6493 /* The verifier was disabled at compile time */
6494 return FALSE;
6495 }
6496
6497 gboolean
mono_verifier_is_enabled_for_class(MonoClass * klass)6498 mono_verifier_is_enabled_for_class (MonoClass *klass)
6499 {
6500 /* The verifier was disabled at compile time */
6501 return FALSE;
6502 }
6503
6504 gboolean
mono_verifier_is_enabled_for_method(MonoMethod * method)6505 mono_verifier_is_enabled_for_method (MonoMethod *method)
6506 {
6507 /* The verifier was disabled at compile time */
6508 return FALSE;
6509 }
6510
6511 GSList*
mono_method_verify(MonoMethod * method,int level)6512 mono_method_verify (MonoMethod *method, int level)
6513 {
6514 /* The verifier was disabled at compile time */
6515 return NULL;
6516 }
6517
6518 void
mono_free_verify_list(GSList * list)6519 mono_free_verify_list (GSList *list)
6520 {
6521 /* The verifier was disabled at compile time */
6522 /* will always be null if verifier is disabled */
6523 }
6524
6525 gboolean
mono_verifier_class_is_valid_generic_instantiation(MonoClass * klass)6526 mono_verifier_class_is_valid_generic_instantiation (MonoClass *klass)
6527 {
6528 return TRUE;
6529 }
6530
6531 gboolean
mono_verifier_is_method_valid_generic_instantiation(MonoMethod * method)6532 mono_verifier_is_method_valid_generic_instantiation (MonoMethod *method)
6533 {
6534 return TRUE;
6535 }
6536
6537
6538
6539 #endif
6540