1 //===-- msan.cc -----------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file is a part of MemorySanitizer.
11 //
12 // MemorySanitizer runtime.
13 //===----------------------------------------------------------------------===//
14
15 #include "msan.h"
16 #include "msan_chained_origin_depot.h"
17 #include "msan_origin.h"
18 #include "msan_report.h"
19 #include "msan_thread.h"
20 #include "msan_poisoning.h"
21 #include "sanitizer_common/sanitizer_atomic.h"
22 #include "sanitizer_common/sanitizer_common.h"
23 #include "sanitizer_common/sanitizer_flags.h"
24 #include "sanitizer_common/sanitizer_flag_parser.h"
25 #include "sanitizer_common/sanitizer_libc.h"
26 #include "sanitizer_common/sanitizer_procmaps.h"
27 #include "sanitizer_common/sanitizer_stacktrace.h"
28 #include "sanitizer_common/sanitizer_symbolizer.h"
29 #include "sanitizer_common/sanitizer_stackdepot.h"
30 #include "ubsan/ubsan_flags.h"
31 #include "ubsan/ubsan_init.h"
32
33 // ACHTUNG! No system header includes in this file.
34
35 using namespace __sanitizer;
36
37 // Globals.
38 static THREADLOCAL int msan_expect_umr = 0;
39 static THREADLOCAL int msan_expected_umr_found = 0;
40
41 // Function argument shadow. Each argument starts at the next available 8-byte
42 // aligned address.
43 SANITIZER_INTERFACE_ATTRIBUTE
44 THREADLOCAL u64 __msan_param_tls[kMsanParamTlsSize / sizeof(u64)];
45
46 // Function argument origin. Each argument starts at the same offset as the
47 // corresponding shadow in (__msan_param_tls). Slightly weird, but changing this
48 // would break compatibility with older prebuilt binaries.
49 SANITIZER_INTERFACE_ATTRIBUTE
50 THREADLOCAL u32 __msan_param_origin_tls[kMsanParamTlsSize / sizeof(u32)];
51
52 SANITIZER_INTERFACE_ATTRIBUTE
53 THREADLOCAL u64 __msan_retval_tls[kMsanRetvalTlsSize / sizeof(u64)];
54
55 SANITIZER_INTERFACE_ATTRIBUTE
56 THREADLOCAL u32 __msan_retval_origin_tls;
57
58 SANITIZER_INTERFACE_ATTRIBUTE
59 ALIGNED(16) THREADLOCAL u64 __msan_va_arg_tls[kMsanParamTlsSize / sizeof(u64)];
60
61 SANITIZER_INTERFACE_ATTRIBUTE
62 ALIGNED(16)
63 THREADLOCAL u32 __msan_va_arg_origin_tls[kMsanParamTlsSize / sizeof(u32)];
64
65 SANITIZER_INTERFACE_ATTRIBUTE
66 THREADLOCAL u64 __msan_va_arg_overflow_size_tls;
67
68 SANITIZER_INTERFACE_ATTRIBUTE
69 THREADLOCAL u32 __msan_origin_tls;
70
71 static THREADLOCAL int is_in_symbolizer;
72
73 extern "C" SANITIZER_WEAK_ATTRIBUTE const int __msan_track_origins;
74
__msan_get_track_origins()75 int __msan_get_track_origins() {
76 return &__msan_track_origins ? __msan_track_origins : 0;
77 }
78
79 extern "C" SANITIZER_WEAK_ATTRIBUTE const int __msan_keep_going;
80
81 namespace __msan {
82
EnterSymbolizer()83 void EnterSymbolizer() { ++is_in_symbolizer; }
ExitSymbolizer()84 void ExitSymbolizer() { --is_in_symbolizer; }
IsInSymbolizer()85 bool IsInSymbolizer() { return is_in_symbolizer; }
86
87 static Flags msan_flags;
88
flags()89 Flags *flags() {
90 return &msan_flags;
91 }
92
93 int msan_inited = 0;
94 bool msan_init_is_running;
95
96 int msan_report_count = 0;
97
98 // Array of stack origins.
99 // FIXME: make it resizable.
100 static const uptr kNumStackOriginDescrs = 1024 * 1024;
101 static const char *StackOriginDescr[kNumStackOriginDescrs];
102 static uptr StackOriginPC[kNumStackOriginDescrs];
103 static atomic_uint32_t NumStackOriginDescrs;
104
SetDefaults()105 void Flags::SetDefaults() {
106 #define MSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
107 #include "msan_flags.inc"
108 #undef MSAN_FLAG
109 }
110
111 // keep_going is an old name for halt_on_error,
112 // and it has inverse meaning.
113 class FlagHandlerKeepGoing : public FlagHandlerBase {
114 bool *halt_on_error_;
115
116 public:
FlagHandlerKeepGoing(bool * halt_on_error)117 explicit FlagHandlerKeepGoing(bool *halt_on_error)
118 : halt_on_error_(halt_on_error) {}
Parse(const char * value)119 bool Parse(const char *value) final {
120 bool tmp;
121 FlagHandler<bool> h(&tmp);
122 if (!h.Parse(value)) return false;
123 *halt_on_error_ = !tmp;
124 return true;
125 }
126 };
127
RegisterMsanFlags(FlagParser * parser,Flags * f)128 static void RegisterMsanFlags(FlagParser *parser, Flags *f) {
129 #define MSAN_FLAG(Type, Name, DefaultValue, Description) \
130 RegisterFlag(parser, #Name, Description, &f->Name);
131 #include "msan_flags.inc"
132 #undef MSAN_FLAG
133
134 FlagHandlerKeepGoing *fh_keep_going = new (FlagParser::Alloc) // NOLINT
135 FlagHandlerKeepGoing(&f->halt_on_error);
136 parser->RegisterHandler("keep_going", fh_keep_going,
137 "deprecated, use halt_on_error");
138 }
139
InitializeFlags()140 static void InitializeFlags() {
141 SetCommonFlagsDefaults();
142 {
143 CommonFlags cf;
144 cf.CopyFrom(*common_flags());
145 cf.external_symbolizer_path = GetEnv("MSAN_SYMBOLIZER_PATH");
146 cf.malloc_context_size = 20;
147 cf.handle_ioctl = true;
148 // FIXME: test and enable.
149 cf.check_printf = false;
150 cf.intercept_tls_get_addr = true;
151 cf.exitcode = 77;
152 OverrideCommonFlags(cf);
153 }
154
155 Flags *f = flags();
156 f->SetDefaults();
157
158 FlagParser parser;
159 RegisterMsanFlags(&parser, f);
160 RegisterCommonFlags(&parser);
161
162 #if MSAN_CONTAINS_UBSAN
163 __ubsan::Flags *uf = __ubsan::flags();
164 uf->SetDefaults();
165
166 FlagParser ubsan_parser;
167 __ubsan::RegisterUbsanFlags(&ubsan_parser, uf);
168 RegisterCommonFlags(&ubsan_parser);
169 #endif
170
171 // Override from user-specified string.
172 if (__msan_default_options)
173 parser.ParseString(__msan_default_options());
174 #if MSAN_CONTAINS_UBSAN
175 const char *ubsan_default_options = __ubsan::MaybeCallUbsanDefaultOptions();
176 ubsan_parser.ParseString(ubsan_default_options);
177 #endif
178
179 const char *msan_options = GetEnv("MSAN_OPTIONS");
180 parser.ParseString(msan_options);
181 #if MSAN_CONTAINS_UBSAN
182 ubsan_parser.ParseString(GetEnv("UBSAN_OPTIONS"));
183 #endif
184 VPrintf(1, "MSAN_OPTIONS: %s\n", msan_options ? msan_options : "<empty>");
185
186 InitializeCommonFlags();
187
188 if (Verbosity()) ReportUnrecognizedFlags();
189
190 if (common_flags()->help) parser.PrintFlagDescriptions();
191
192 // Check if deprecated exit_code MSan flag is set.
193 if (f->exit_code != -1) {
194 if (Verbosity())
195 Printf("MSAN_OPTIONS=exit_code is deprecated! "
196 "Please use MSAN_OPTIONS=exitcode instead.\n");
197 CommonFlags cf;
198 cf.CopyFrom(*common_flags());
199 cf.exitcode = f->exit_code;
200 OverrideCommonFlags(cf);
201 }
202
203 // Check flag values:
204 if (f->origin_history_size < 0 ||
205 f->origin_history_size > Origin::kMaxDepth) {
206 Printf(
207 "Origin history size invalid: %d. Must be 0 (unlimited) or in [1, %d] "
208 "range.\n",
209 f->origin_history_size, Origin::kMaxDepth);
210 Die();
211 }
212 // Limiting to kStackDepotMaxUseCount / 2 to avoid overflow in
213 // StackDepotHandle::inc_use_count_unsafe.
214 if (f->origin_history_per_stack_limit < 0 ||
215 f->origin_history_per_stack_limit > kStackDepotMaxUseCount / 2) {
216 Printf(
217 "Origin per-stack limit invalid: %d. Must be 0 (unlimited) or in [1, "
218 "%d] range.\n",
219 f->origin_history_per_stack_limit, kStackDepotMaxUseCount / 2);
220 Die();
221 }
222 if (f->store_context_size < 1) f->store_context_size = 1;
223 }
224
GetStackTrace(BufferedStackTrace * stack,uptr max_s,uptr pc,uptr bp,void * context,bool request_fast_unwind)225 void GetStackTrace(BufferedStackTrace *stack, uptr max_s, uptr pc, uptr bp,
226 void *context, bool request_fast_unwind) {
227 MsanThread *t = GetCurrentThread();
228 if (!t || !StackTrace::WillUseFastUnwind(request_fast_unwind)) {
229 // Block reports from our interceptors during _Unwind_Backtrace.
230 SymbolizerScope sym_scope;
231 return stack->Unwind(max_s, pc, bp, context, 0, 0, request_fast_unwind);
232 }
233 stack->Unwind(max_s, pc, bp, context, t->stack_top(), t->stack_bottom(),
234 request_fast_unwind);
235 }
236
PrintWarning(uptr pc,uptr bp)237 void PrintWarning(uptr pc, uptr bp) {
238 PrintWarningWithOrigin(pc, bp, __msan_origin_tls);
239 }
240
PrintWarningWithOrigin(uptr pc,uptr bp,u32 origin)241 void PrintWarningWithOrigin(uptr pc, uptr bp, u32 origin) {
242 if (msan_expect_umr) {
243 // Printf("Expected UMR\n");
244 __msan_origin_tls = origin;
245 msan_expected_umr_found = 1;
246 return;
247 }
248
249 ++msan_report_count;
250
251 GET_FATAL_STACK_TRACE_PC_BP(pc, bp);
252
253 u32 report_origin =
254 (__msan_get_track_origins() && Origin::isValidId(origin)) ? origin : 0;
255 ReportUMR(&stack, report_origin);
256
257 if (__msan_get_track_origins() && !Origin::isValidId(origin)) {
258 Printf(
259 " ORIGIN: invalid (%x). Might be a bug in MemorySanitizer origin "
260 "tracking.\n This could still be a bug in your code, too!\n",
261 origin);
262 }
263 }
264
UnpoisonParam(uptr n)265 void UnpoisonParam(uptr n) {
266 internal_memset(__msan_param_tls, 0, n * sizeof(*__msan_param_tls));
267 }
268
269 // Backup MSan runtime TLS state.
270 // Implementation must be async-signal-safe.
271 // Instances of this class may live on the signal handler stack, and data size
272 // may be an issue.
Backup()273 void ScopedThreadLocalStateBackup::Backup() {
274 va_arg_overflow_size_tls = __msan_va_arg_overflow_size_tls;
275 }
276
Restore()277 void ScopedThreadLocalStateBackup::Restore() {
278 // A lame implementation that only keeps essential state and resets the rest.
279 __msan_va_arg_overflow_size_tls = va_arg_overflow_size_tls;
280
281 internal_memset(__msan_param_tls, 0, sizeof(__msan_param_tls));
282 internal_memset(__msan_retval_tls, 0, sizeof(__msan_retval_tls));
283 internal_memset(__msan_va_arg_tls, 0, sizeof(__msan_va_arg_tls));
284 internal_memset(__msan_va_arg_origin_tls, 0,
285 sizeof(__msan_va_arg_origin_tls));
286
287 if (__msan_get_track_origins()) {
288 internal_memset(&__msan_retval_origin_tls, 0,
289 sizeof(__msan_retval_origin_tls));
290 internal_memset(__msan_param_origin_tls, 0,
291 sizeof(__msan_param_origin_tls));
292 }
293 }
294
UnpoisonThreadLocalState()295 void UnpoisonThreadLocalState() {
296 }
297
GetStackOriginDescr(u32 id,uptr * pc)298 const char *GetStackOriginDescr(u32 id, uptr *pc) {
299 CHECK_LT(id, kNumStackOriginDescrs);
300 if (pc) *pc = StackOriginPC[id];
301 return StackOriginDescr[id];
302 }
303
ChainOrigin(u32 id,StackTrace * stack)304 u32 ChainOrigin(u32 id, StackTrace *stack) {
305 MsanThread *t = GetCurrentThread();
306 if (t && t->InSignalHandler())
307 return id;
308
309 Origin o = Origin::FromRawId(id);
310 stack->tag = StackTrace::TAG_UNKNOWN;
311 Origin chained = Origin::CreateChainedOrigin(o, stack);
312 return chained.raw_id();
313 }
314
315 } // namespace __msan
316
317 // Interface.
318
319 using namespace __msan;
320
321 #define MSAN_MAYBE_WARNING(type, size) \
322 void __msan_maybe_warning_##size(type s, u32 o) { \
323 GET_CALLER_PC_BP_SP; \
324 (void) sp; \
325 if (UNLIKELY(s)) { \
326 PrintWarningWithOrigin(pc, bp, o); \
327 if (__msan::flags()->halt_on_error) { \
328 Printf("Exiting\n"); \
329 Die(); \
330 } \
331 } \
332 }
333
334 MSAN_MAYBE_WARNING(u8, 1)
335 MSAN_MAYBE_WARNING(u16, 2)
336 MSAN_MAYBE_WARNING(u32, 4)
337 MSAN_MAYBE_WARNING(u64, 8)
338
339 #define MSAN_MAYBE_STORE_ORIGIN(type, size) \
340 void __msan_maybe_store_origin_##size(type s, void *p, u32 o) { \
341 if (UNLIKELY(s)) { \
342 if (__msan_get_track_origins() > 1) { \
343 GET_CALLER_PC_BP_SP; \
344 (void) sp; \
345 GET_STORE_STACK_TRACE_PC_BP(pc, bp); \
346 o = ChainOrigin(o, &stack); \
347 } \
348 *(u32 *)MEM_TO_ORIGIN((uptr)p & ~3UL) = o; \
349 } \
350 }
351
352 MSAN_MAYBE_STORE_ORIGIN(u8, 1)
353 MSAN_MAYBE_STORE_ORIGIN(u16, 2)
354 MSAN_MAYBE_STORE_ORIGIN(u32, 4)
355 MSAN_MAYBE_STORE_ORIGIN(u64, 8)
356
__msan_warning()357 void __msan_warning() {
358 GET_CALLER_PC_BP_SP;
359 (void)sp;
360 PrintWarning(pc, bp);
361 if (__msan::flags()->halt_on_error) {
362 if (__msan::flags()->print_stats)
363 ReportStats();
364 Printf("Exiting\n");
365 Die();
366 }
367 }
368
__msan_warning_noreturn()369 void __msan_warning_noreturn() {
370 GET_CALLER_PC_BP_SP;
371 (void)sp;
372 PrintWarning(pc, bp);
373 if (__msan::flags()->print_stats)
374 ReportStats();
375 Printf("Exiting\n");
376 Die();
377 }
378
OnStackUnwind(const SignalContext & sig,const void *,BufferedStackTrace * stack)379 static void OnStackUnwind(const SignalContext &sig, const void *,
380 BufferedStackTrace *stack) {
381 GetStackTrace(stack, kStackTraceMax, sig.pc, sig.bp, sig.context,
382 common_flags()->fast_unwind_on_fatal);
383 }
384
MsanOnDeadlySignal(int signo,void * siginfo,void * context)385 static void MsanOnDeadlySignal(int signo, void *siginfo, void *context) {
386 HandleDeadlySignal(siginfo, context, GetTid(), &OnStackUnwind, nullptr);
387 }
388
MsanCheckFailed(const char * file,int line,const char * cond,u64 v1,u64 v2)389 static void MsanCheckFailed(const char *file, int line, const char *cond,
390 u64 v1, u64 v2) {
391 Report("MemorySanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n", file,
392 line, cond, (uptr)v1, (uptr)v2);
393 PRINT_CURRENT_STACK_CHECK();
394 Die();
395 }
396
__msan_init()397 void __msan_init() {
398 CHECK(!msan_init_is_running);
399 if (msan_inited) return;
400 msan_init_is_running = 1;
401 SanitizerToolName = "MemorySanitizer";
402
403 AvoidCVE_2016_2143();
404
405 CacheBinaryName();
406 CheckASLR();
407 InitializeFlags();
408
409 // Install tool-specific callbacks in sanitizer_common.
410 SetCheckFailedCallback(MsanCheckFailed);
411
412 __sanitizer_set_report_path(common_flags()->log_path);
413
414 InitializeInterceptors();
415 InitTlsSize();
416 InstallDeadlySignalHandlers(MsanOnDeadlySignal);
417 InstallAtExitHandler(); // Needs __cxa_atexit interceptor.
418
419 DisableCoreDumperIfNecessary();
420 if (StackSizeIsUnlimited()) {
421 VPrintf(1, "Unlimited stack, doing reexec\n");
422 // A reasonably large stack size. It is bigger than the usual 8Mb, because,
423 // well, the program could have been run with unlimited stack for a reason.
424 SetStackSizeLimitInBytes(32 * 1024 * 1024);
425 ReExec();
426 }
427
428 __msan_clear_on_return();
429 if (__msan_get_track_origins())
430 VPrintf(1, "msan_track_origins\n");
431 if (!InitShadow(__msan_get_track_origins())) {
432 Printf("FATAL: MemorySanitizer can not mmap the shadow memory.\n");
433 Printf("FATAL: Make sure to compile with -fPIE and to link with -pie.\n");
434 Printf("FATAL: Disabling ASLR is known to cause this error.\n");
435 Printf("FATAL: If running under GDB, try "
436 "'set disable-randomization off'.\n");
437 DumpProcessMap();
438 Die();
439 }
440
441 Symbolizer::GetOrInit()->AddHooks(EnterSymbolizer, ExitSymbolizer);
442
443 InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
444
445 MsanTSDInit(MsanTSDDtor);
446
447 MsanAllocatorInit();
448
449 MsanThread *main_thread = MsanThread::Create(nullptr, nullptr);
450 SetCurrentThread(main_thread);
451 main_thread->ThreadStart();
452
453 #if MSAN_CONTAINS_UBSAN
454 __ubsan::InitAsPlugin();
455 #endif
456
457 VPrintf(1, "MemorySanitizer init done\n");
458
459 msan_init_is_running = 0;
460 msan_inited = 1;
461 }
462
__msan_set_keep_going(int keep_going)463 void __msan_set_keep_going(int keep_going) {
464 flags()->halt_on_error = !keep_going;
465 }
466
__msan_set_expect_umr(int expect_umr)467 void __msan_set_expect_umr(int expect_umr) {
468 if (expect_umr) {
469 msan_expected_umr_found = 0;
470 } else if (!msan_expected_umr_found) {
471 GET_CALLER_PC_BP_SP;
472 (void)sp;
473 GET_FATAL_STACK_TRACE_PC_BP(pc, bp);
474 ReportExpectedUMRNotFound(&stack);
475 Die();
476 }
477 msan_expect_umr = expect_umr;
478 }
479
__msan_print_shadow(const void * x,uptr size)480 void __msan_print_shadow(const void *x, uptr size) {
481 if (!MEM_IS_APP(x)) {
482 Printf("Not a valid application address: %p\n", x);
483 return;
484 }
485
486 DescribeMemoryRange(x, size);
487 }
488
__msan_dump_shadow(const void * x,uptr size)489 void __msan_dump_shadow(const void *x, uptr size) {
490 if (!MEM_IS_APP(x)) {
491 Printf("Not a valid application address: %p\n", x);
492 return;
493 }
494
495 unsigned char *s = (unsigned char*)MEM_TO_SHADOW(x);
496 for (uptr i = 0; i < size; i++)
497 Printf("%x%x ", s[i] >> 4, s[i] & 0xf);
498 Printf("\n");
499 }
500
__msan_test_shadow(const void * x,uptr size)501 sptr __msan_test_shadow(const void *x, uptr size) {
502 if (!MEM_IS_APP(x)) return -1;
503 unsigned char *s = (unsigned char *)MEM_TO_SHADOW((uptr)x);
504 for (uptr i = 0; i < size; ++i)
505 if (s[i])
506 return i;
507 return -1;
508 }
509
__msan_check_mem_is_initialized(const void * x,uptr size)510 void __msan_check_mem_is_initialized(const void *x, uptr size) {
511 if (!__msan::flags()->report_umrs) return;
512 sptr offset = __msan_test_shadow(x, size);
513 if (offset < 0)
514 return;
515
516 GET_CALLER_PC_BP_SP;
517 (void)sp;
518 ReportUMRInsideAddressRange(__func__, x, size, offset);
519 __msan::PrintWarningWithOrigin(pc, bp,
520 __msan_get_origin(((const char *)x) + offset));
521 if (__msan::flags()->halt_on_error) {
522 Printf("Exiting\n");
523 Die();
524 }
525 }
526
__msan_set_poison_in_malloc(int do_poison)527 int __msan_set_poison_in_malloc(int do_poison) {
528 int old = flags()->poison_in_malloc;
529 flags()->poison_in_malloc = do_poison;
530 return old;
531 }
532
__msan_has_dynamic_component()533 int __msan_has_dynamic_component() { return false; }
534
535 NOINLINE
__msan_clear_on_return()536 void __msan_clear_on_return() {
537 __msan_param_tls[0] = 0;
538 }
539
__msan_partial_poison(const void * data,void * shadow,uptr size)540 void __msan_partial_poison(const void* data, void* shadow, uptr size) {
541 internal_memcpy((void*)MEM_TO_SHADOW((uptr)data), shadow, size);
542 }
543
__msan_load_unpoisoned(const void * src,uptr size,void * dst)544 void __msan_load_unpoisoned(const void *src, uptr size, void *dst) {
545 internal_memcpy(dst, src, size);
546 __msan_unpoison(dst, size);
547 }
548
__msan_set_origin(const void * a,uptr size,u32 origin)549 void __msan_set_origin(const void *a, uptr size, u32 origin) {
550 if (__msan_get_track_origins()) SetOrigin(a, size, origin);
551 }
552
553 // 'descr' is created at compile time and contains '----' in the beginning.
554 // When we see descr for the first time we replace '----' with a uniq id
555 // and set the origin to (id | (31-th bit)).
__msan_set_alloca_origin(void * a,uptr size,char * descr)556 void __msan_set_alloca_origin(void *a, uptr size, char *descr) {
557 __msan_set_alloca_origin4(a, size, descr, 0);
558 }
559
__msan_set_alloca_origin4(void * a,uptr size,char * descr,uptr pc)560 void __msan_set_alloca_origin4(void *a, uptr size, char *descr, uptr pc) {
561 static const u32 dash = '-';
562 static const u32 first_timer =
563 dash + (dash << 8) + (dash << 16) + (dash << 24);
564 u32 *id_ptr = (u32*)descr;
565 bool print = false; // internal_strstr(descr + 4, "AllocaTOTest") != 0;
566 u32 id = *id_ptr;
567 if (id == first_timer) {
568 u32 idx = atomic_fetch_add(&NumStackOriginDescrs, 1, memory_order_relaxed);
569 CHECK_LT(idx, kNumStackOriginDescrs);
570 StackOriginDescr[idx] = descr + 4;
571 #if SANITIZER_PPC64V1
572 // On PowerPC64 ELFv1, the address of a function actually points to a
573 // three-doubleword data structure with the first field containing
574 // the address of the function's code.
575 if (pc)
576 pc = *reinterpret_cast<uptr*>(pc);
577 #endif
578 StackOriginPC[idx] = pc;
579 id = Origin::CreateStackOrigin(idx).raw_id();
580 *id_ptr = id;
581 if (print)
582 Printf("First time: idx=%d id=%d %s %p \n", idx, id, descr + 4, pc);
583 }
584 if (print)
585 Printf("__msan_set_alloca_origin: descr=%s id=%x\n", descr + 4, id);
586 __msan_set_origin(a, size, id);
587 }
588
__msan_chain_origin(u32 id)589 u32 __msan_chain_origin(u32 id) {
590 GET_CALLER_PC_BP_SP;
591 (void)sp;
592 GET_STORE_STACK_TRACE_PC_BP(pc, bp);
593 return ChainOrigin(id, &stack);
594 }
595
__msan_get_origin(const void * a)596 u32 __msan_get_origin(const void *a) {
597 if (!__msan_get_track_origins()) return 0;
598 uptr x = (uptr)a;
599 uptr aligned = x & ~3ULL;
600 uptr origin_ptr = MEM_TO_ORIGIN(aligned);
601 return *(u32*)origin_ptr;
602 }
603
__msan_origin_is_descendant_or_same(u32 this_id,u32 prev_id)604 int __msan_origin_is_descendant_or_same(u32 this_id, u32 prev_id) {
605 Origin o = Origin::FromRawId(this_id);
606 while (o.raw_id() != prev_id && o.isChainedOrigin())
607 o = o.getNextChainedOrigin(nullptr);
608 return o.raw_id() == prev_id;
609 }
610
__msan_get_umr_origin()611 u32 __msan_get_umr_origin() {
612 return __msan_origin_tls;
613 }
614
__sanitizer_unaligned_load16(const uu16 * p)615 u16 __sanitizer_unaligned_load16(const uu16 *p) {
616 *(uu16 *)&__msan_retval_tls[0] = *(uu16 *)MEM_TO_SHADOW((uptr)p);
617 if (__msan_get_track_origins())
618 __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
619 return *p;
620 }
__sanitizer_unaligned_load32(const uu32 * p)621 u32 __sanitizer_unaligned_load32(const uu32 *p) {
622 *(uu32 *)&__msan_retval_tls[0] = *(uu32 *)MEM_TO_SHADOW((uptr)p);
623 if (__msan_get_track_origins())
624 __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
625 return *p;
626 }
__sanitizer_unaligned_load64(const uu64 * p)627 u64 __sanitizer_unaligned_load64(const uu64 *p) {
628 __msan_retval_tls[0] = *(uu64 *)MEM_TO_SHADOW((uptr)p);
629 if (__msan_get_track_origins())
630 __msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
631 return *p;
632 }
__sanitizer_unaligned_store16(uu16 * p,u16 x)633 void __sanitizer_unaligned_store16(uu16 *p, u16 x) {
634 u16 s = *(uu16 *)&__msan_param_tls[1];
635 *(uu16 *)MEM_TO_SHADOW((uptr)p) = s;
636 if (s && __msan_get_track_origins())
637 if (uu32 o = __msan_param_origin_tls[2])
638 SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o);
639 *p = x;
640 }
__sanitizer_unaligned_store32(uu32 * p,u32 x)641 void __sanitizer_unaligned_store32(uu32 *p, u32 x) {
642 u32 s = *(uu32 *)&__msan_param_tls[1];
643 *(uu32 *)MEM_TO_SHADOW((uptr)p) = s;
644 if (s && __msan_get_track_origins())
645 if (uu32 o = __msan_param_origin_tls[2])
646 SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o);
647 *p = x;
648 }
__sanitizer_unaligned_store64(uu64 * p,u64 x)649 void __sanitizer_unaligned_store64(uu64 *p, u64 x) {
650 u64 s = __msan_param_tls[1];
651 *(uu64 *)MEM_TO_SHADOW((uptr)p) = s;
652 if (s && __msan_get_track_origins())
653 if (uu32 o = __msan_param_origin_tls[2])
654 SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o);
655 *p = x;
656 }
657
__msan_set_death_callback(void (* callback)(void))658 void __msan_set_death_callback(void (*callback)(void)) {
659 SetUserDieCallback(callback);
660 }
661
662 #if !SANITIZER_SUPPORTS_WEAK_HOOKS
663 extern "C" {
664 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
__msan_default_options()665 const char* __msan_default_options() { return ""; }
666 } // extern "C"
667 #endif
668
669 extern "C" {
670 SANITIZER_INTERFACE_ATTRIBUTE
__sanitizer_print_stack_trace()671 void __sanitizer_print_stack_trace() {
672 GET_FATAL_STACK_TRACE_PC_BP(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME());
673 stack.Print();
674 }
675 } // extern "C"
676