1 //===-- msan_interceptors.cpp ---------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file is a part of MemorySanitizer.
10 //
11 // Interceptors for standard library functions.
12 //
13 // FIXME: move as many interceptors as possible into
14 // sanitizer_common/sanitizer_common_interceptors.h
15 //===----------------------------------------------------------------------===//
16
17 #include "interception/interception.h"
18 #include "msan.h"
19 #include "msan_chained_origin_depot.h"
20 #include "msan_origin.h"
21 #include "msan_report.h"
22 #include "msan_thread.h"
23 #include "msan_poisoning.h"
24 #include "sanitizer_common/sanitizer_errno_codes.h"
25 #include "sanitizer_common/sanitizer_platform_limits_posix.h"
26 #include "sanitizer_common/sanitizer_platform_limits_netbsd.h"
27 #include "sanitizer_common/sanitizer_allocator.h"
28 #include "sanitizer_common/sanitizer_allocator_interface.h"
29 #include "sanitizer_common/sanitizer_allocator_internal.h"
30 #include "sanitizer_common/sanitizer_atomic.h"
31 #include "sanitizer_common/sanitizer_common.h"
32 #include "sanitizer_common/sanitizer_errno.h"
33 #include "sanitizer_common/sanitizer_stackdepot.h"
34 #include "sanitizer_common/sanitizer_libc.h"
35 #include "sanitizer_common/sanitizer_linux.h"
36 #include "sanitizer_common/sanitizer_tls_get_addr.h"
37 #include "sanitizer_common/sanitizer_vector.h"
38
39 #if SANITIZER_NETBSD
40 #define fstat __fstat50
41 #define gettimeofday __gettimeofday50
42 #define getrusage __getrusage50
43 #define tzset __tzset50
44 #endif
45
46 #include <stdarg.h>
47 // ACHTUNG! No other system header includes in this file.
48 // Ideally, we should get rid of stdarg.h as well.
49
50 using namespace __msan;
51
52 using __sanitizer::memory_order;
53 using __sanitizer::atomic_load;
54 using __sanitizer::atomic_store;
55 using __sanitizer::atomic_uintptr_t;
56
57 DECLARE_REAL(SIZE_T, strlen, const char *s)
58 DECLARE_REAL(SIZE_T, strnlen, const char *s, SIZE_T maxlen)
59 DECLARE_REAL(void *, memcpy, void *dest, const void *src, uptr n)
60 DECLARE_REAL(void *, memset, void *dest, int c, uptr n)
61
62 // True if this is a nested interceptor.
63 static THREADLOCAL int in_interceptor_scope;
64
__msan_scoped_disable_interceptor_checks()65 void __msan_scoped_disable_interceptor_checks() { ++in_interceptor_scope; }
__msan_scoped_enable_interceptor_checks()66 void __msan_scoped_enable_interceptor_checks() { --in_interceptor_scope; }
67
68 struct InterceptorScope {
InterceptorScopeInterceptorScope69 InterceptorScope() { ++in_interceptor_scope; }
~InterceptorScopeInterceptorScope70 ~InterceptorScope() { --in_interceptor_scope; }
71 };
72
IsInInterceptorScope()73 bool IsInInterceptorScope() {
74 return in_interceptor_scope;
75 }
76
77 static uptr allocated_for_dlsym;
78 static const uptr kDlsymAllocPoolSize = 1024;
79 static uptr alloc_memory_for_dlsym[kDlsymAllocPoolSize];
80
IsInDlsymAllocPool(const void * ptr)81 static bool IsInDlsymAllocPool(const void *ptr) {
82 uptr off = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
83 return off < sizeof(alloc_memory_for_dlsym);
84 }
85
AllocateFromLocalPool(uptr size_in_bytes)86 static void *AllocateFromLocalPool(uptr size_in_bytes) {
87 uptr size_in_words = RoundUpTo(size_in_bytes, kWordSize) / kWordSize;
88 void *mem = (void *)&alloc_memory_for_dlsym[allocated_for_dlsym];
89 allocated_for_dlsym += size_in_words;
90 CHECK_LT(allocated_for_dlsym, kDlsymAllocPoolSize);
91 return mem;
92 }
93
94 #define ENSURE_MSAN_INITED() do { \
95 CHECK(!msan_init_is_running); \
96 if (!msan_inited) { \
97 __msan_init(); \
98 } \
99 } while (0)
100
101 // Check that [x, x+n) range is unpoisoned.
102 #define CHECK_UNPOISONED_0(x, n) \
103 do { \
104 sptr __offset = __msan_test_shadow(x, n); \
105 if (__msan::IsInSymbolizer()) break; \
106 if (__offset >= 0 && __msan::flags()->report_umrs) { \
107 GET_CALLER_PC_BP_SP; \
108 (void)sp; \
109 ReportUMRInsideAddressRange(__func__, x, n, __offset); \
110 __msan::PrintWarningWithOrigin( \
111 pc, bp, __msan_get_origin((const char *)x + __offset)); \
112 if (__msan::flags()->halt_on_error) { \
113 Printf("Exiting\n"); \
114 Die(); \
115 } \
116 } \
117 } while (0)
118
119 // Check that [x, x+n) range is unpoisoned unless we are in a nested
120 // interceptor.
121 #define CHECK_UNPOISONED(x, n) \
122 do { \
123 if (!IsInInterceptorScope()) CHECK_UNPOISONED_0(x, n); \
124 } while (0)
125
126 #define CHECK_UNPOISONED_STRING_OF_LEN(x, len, n) \
127 CHECK_UNPOISONED((x), \
128 common_flags()->strict_string_checks ? (len) + 1 : (n) )
129
130 #define CHECK_UNPOISONED_STRING(x, n) \
131 CHECK_UNPOISONED_STRING_OF_LEN((x), internal_strlen(x), (n))
132
133 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(SIZE_T,fread_unlocked,void * ptr,SIZE_T size,SIZE_T nmemb,void * file)134 INTERCEPTOR(SIZE_T, fread_unlocked, void *ptr, SIZE_T size, SIZE_T nmemb,
135 void *file) {
136 ENSURE_MSAN_INITED();
137 SIZE_T res = REAL(fread_unlocked)(ptr, size, nmemb, file);
138 if (res > 0)
139 __msan_unpoison(ptr, res *size);
140 return res;
141 }
142 #define MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED INTERCEPT_FUNCTION(fread_unlocked)
143 #else
144 #define MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED
145 #endif
146
147 #if !SANITIZER_NETBSD
INTERCEPTOR(void *,mempcpy,void * dest,const void * src,SIZE_T n)148 INTERCEPTOR(void *, mempcpy, void *dest, const void *src, SIZE_T n) {
149 return (char *)__msan_memcpy(dest, src, n) + n;
150 }
151 #define MSAN_MAYBE_INTERCEPT_MEMPCPY INTERCEPT_FUNCTION(mempcpy)
152 #else
153 #define MSAN_MAYBE_INTERCEPT_MEMPCPY
154 #endif
155
INTERCEPTOR(void *,memccpy,void * dest,const void * src,int c,SIZE_T n)156 INTERCEPTOR(void *, memccpy, void *dest, const void *src, int c, SIZE_T n) {
157 ENSURE_MSAN_INITED();
158 void *res = REAL(memccpy)(dest, src, c, n);
159 CHECK(!res || (res >= dest && res <= (char *)dest + n));
160 SIZE_T sz = res ? (char *)res - (char *)dest : n;
161 CHECK_UNPOISONED(src, sz);
162 __msan_unpoison(dest, sz);
163 return res;
164 }
165
INTERCEPTOR(void *,bcopy,const void * src,void * dest,SIZE_T n)166 INTERCEPTOR(void *, bcopy, const void *src, void *dest, SIZE_T n) {
167 return __msan_memmove(dest, src, n);
168 }
169
INTERCEPTOR(int,posix_memalign,void ** memptr,SIZE_T alignment,SIZE_T size)170 INTERCEPTOR(int, posix_memalign, void **memptr, SIZE_T alignment, SIZE_T size) {
171 GET_MALLOC_STACK_TRACE;
172 CHECK_NE(memptr, 0);
173 int res = msan_posix_memalign(memptr, alignment, size, &stack);
174 if (!res)
175 __msan_unpoison(memptr, sizeof(*memptr));
176 return res;
177 }
178
179 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(void *,memalign,SIZE_T alignment,SIZE_T size)180 INTERCEPTOR(void *, memalign, SIZE_T alignment, SIZE_T size) {
181 GET_MALLOC_STACK_TRACE;
182 return msan_memalign(alignment, size, &stack);
183 }
184 #define MSAN_MAYBE_INTERCEPT_MEMALIGN INTERCEPT_FUNCTION(memalign)
185 #else
186 #define MSAN_MAYBE_INTERCEPT_MEMALIGN
187 #endif
188
INTERCEPTOR(void *,aligned_alloc,SIZE_T alignment,SIZE_T size)189 INTERCEPTOR(void *, aligned_alloc, SIZE_T alignment, SIZE_T size) {
190 GET_MALLOC_STACK_TRACE;
191 return msan_aligned_alloc(alignment, size, &stack);
192 }
193
194 #if !SANITIZER_NETBSD
INTERCEPTOR(void *,__libc_memalign,SIZE_T alignment,SIZE_T size)195 INTERCEPTOR(void *, __libc_memalign, SIZE_T alignment, SIZE_T size) {
196 GET_MALLOC_STACK_TRACE;
197 void *ptr = msan_memalign(alignment, size, &stack);
198 if (ptr)
199 DTLS_on_libc_memalign(ptr, size);
200 return ptr;
201 }
202 #define MSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN INTERCEPT_FUNCTION(__libc_memalign)
203 #else
204 #define MSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN
205 #endif
206
INTERCEPTOR(void *,valloc,SIZE_T size)207 INTERCEPTOR(void *, valloc, SIZE_T size) {
208 GET_MALLOC_STACK_TRACE;
209 return msan_valloc(size, &stack);
210 }
211
212 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(void *,pvalloc,SIZE_T size)213 INTERCEPTOR(void *, pvalloc, SIZE_T size) {
214 GET_MALLOC_STACK_TRACE;
215 return msan_pvalloc(size, &stack);
216 }
217 #define MSAN_MAYBE_INTERCEPT_PVALLOC INTERCEPT_FUNCTION(pvalloc)
218 #else
219 #define MSAN_MAYBE_INTERCEPT_PVALLOC
220 #endif
221
INTERCEPTOR(void,free,void * ptr)222 INTERCEPTOR(void, free, void *ptr) {
223 GET_MALLOC_STACK_TRACE;
224 if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
225 MsanDeallocate(&stack, ptr);
226 }
227
228 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(void,cfree,void * ptr)229 INTERCEPTOR(void, cfree, void *ptr) {
230 GET_MALLOC_STACK_TRACE;
231 if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
232 MsanDeallocate(&stack, ptr);
233 }
234 #define MSAN_MAYBE_INTERCEPT_CFREE INTERCEPT_FUNCTION(cfree)
235 #else
236 #define MSAN_MAYBE_INTERCEPT_CFREE
237 #endif
238
239 #if !SANITIZER_NETBSD
INTERCEPTOR(uptr,malloc_usable_size,void * ptr)240 INTERCEPTOR(uptr, malloc_usable_size, void *ptr) {
241 return __sanitizer_get_allocated_size(ptr);
242 }
243 #define MSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE \
244 INTERCEPT_FUNCTION(malloc_usable_size)
245 #else
246 #define MSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE
247 #endif
248
249 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
250 // This function actually returns a struct by value, but we can't unpoison a
251 // temporary! The following is equivalent on all supported platforms but
252 // aarch64 (which uses a different register for sret value). We have a test
253 // to confirm that.
INTERCEPTOR(void,mallinfo,__sanitizer_struct_mallinfo * sret)254 INTERCEPTOR(void, mallinfo, __sanitizer_struct_mallinfo *sret) {
255 #ifdef __aarch64__
256 uptr r8;
257 asm volatile("mov %0,x8" : "=r" (r8));
258 sret = reinterpret_cast<__sanitizer_struct_mallinfo*>(r8);
259 #endif
260 REAL(memset)(sret, 0, sizeof(*sret));
261 __msan_unpoison(sret, sizeof(*sret));
262 }
263 #define MSAN_MAYBE_INTERCEPT_MALLINFO INTERCEPT_FUNCTION(mallinfo)
264 #else
265 #define MSAN_MAYBE_INTERCEPT_MALLINFO
266 #endif
267
268 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(int,mallopt,int cmd,int value)269 INTERCEPTOR(int, mallopt, int cmd, int value) {
270 return 0;
271 }
272 #define MSAN_MAYBE_INTERCEPT_MALLOPT INTERCEPT_FUNCTION(mallopt)
273 #else
274 #define MSAN_MAYBE_INTERCEPT_MALLOPT
275 #endif
276
277 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(void,malloc_stats,void)278 INTERCEPTOR(void, malloc_stats, void) {
279 // FIXME: implement, but don't call REAL(malloc_stats)!
280 }
281 #define MSAN_MAYBE_INTERCEPT_MALLOC_STATS INTERCEPT_FUNCTION(malloc_stats)
282 #else
283 #define MSAN_MAYBE_INTERCEPT_MALLOC_STATS
284 #endif
285
INTERCEPTOR(char *,strcpy,char * dest,const char * src)286 INTERCEPTOR(char *, strcpy, char *dest, const char *src) {
287 ENSURE_MSAN_INITED();
288 GET_STORE_STACK_TRACE;
289 SIZE_T n = internal_strlen(src);
290 CHECK_UNPOISONED_STRING(src + n, 0);
291 char *res = REAL(strcpy)(dest, src);
292 CopyShadowAndOrigin(dest, src, n + 1, &stack);
293 return res;
294 }
295
INTERCEPTOR(char *,strncpy,char * dest,const char * src,SIZE_T n)296 INTERCEPTOR(char *, strncpy, char *dest, const char *src, SIZE_T n) {
297 ENSURE_MSAN_INITED();
298 GET_STORE_STACK_TRACE;
299 SIZE_T copy_size = internal_strnlen(src, n);
300 if (copy_size < n)
301 copy_size++; // trailing \0
302 char *res = REAL(strncpy)(dest, src, n);
303 CopyShadowAndOrigin(dest, src, copy_size, &stack);
304 __msan_unpoison(dest + copy_size, n - copy_size);
305 return res;
306 }
307
308 #if !SANITIZER_NETBSD
INTERCEPTOR(char *,stpcpy,char * dest,const char * src)309 INTERCEPTOR(char *, stpcpy, char *dest, const char *src) {
310 ENSURE_MSAN_INITED();
311 GET_STORE_STACK_TRACE;
312 SIZE_T n = internal_strlen(src);
313 CHECK_UNPOISONED_STRING(src + n, 0);
314 char *res = REAL(stpcpy)(dest, src);
315 CopyShadowAndOrigin(dest, src, n + 1, &stack);
316 return res;
317 }
318 #define MSAN_MAYBE_INTERCEPT_STPCPY INTERCEPT_FUNCTION(stpcpy)
319 #else
320 #define MSAN_MAYBE_INTERCEPT_STPCPY
321 #endif
322
INTERCEPTOR(char *,strdup,char * src)323 INTERCEPTOR(char *, strdup, char *src) {
324 ENSURE_MSAN_INITED();
325 GET_STORE_STACK_TRACE;
326 // On FreeBSD strdup() leverages strlen().
327 InterceptorScope interceptor_scope;
328 SIZE_T n = internal_strlen(src);
329 CHECK_UNPOISONED_STRING(src + n, 0);
330 char *res = REAL(strdup)(src);
331 CopyShadowAndOrigin(res, src, n + 1, &stack);
332 return res;
333 }
334
335 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(char *,__strdup,char * src)336 INTERCEPTOR(char *, __strdup, char *src) {
337 ENSURE_MSAN_INITED();
338 GET_STORE_STACK_TRACE;
339 SIZE_T n = internal_strlen(src);
340 CHECK_UNPOISONED_STRING(src + n, 0);
341 char *res = REAL(__strdup)(src);
342 CopyShadowAndOrigin(res, src, n + 1, &stack);
343 return res;
344 }
345 #define MSAN_MAYBE_INTERCEPT___STRDUP INTERCEPT_FUNCTION(__strdup)
346 #else
347 #define MSAN_MAYBE_INTERCEPT___STRDUP
348 #endif
349
350 #if !SANITIZER_NETBSD
INTERCEPTOR(char *,gcvt,double number,SIZE_T ndigit,char * buf)351 INTERCEPTOR(char *, gcvt, double number, SIZE_T ndigit, char *buf) {
352 ENSURE_MSAN_INITED();
353 char *res = REAL(gcvt)(number, ndigit, buf);
354 SIZE_T n = internal_strlen(buf);
355 __msan_unpoison(buf, n + 1);
356 return res;
357 }
358 #define MSAN_MAYBE_INTERCEPT_GCVT INTERCEPT_FUNCTION(gcvt)
359 #else
360 #define MSAN_MAYBE_INTERCEPT_GCVT
361 #endif
362
INTERCEPTOR(char *,strcat,char * dest,const char * src)363 INTERCEPTOR(char *, strcat, char *dest, const char *src) {
364 ENSURE_MSAN_INITED();
365 GET_STORE_STACK_TRACE;
366 SIZE_T src_size = internal_strlen(src);
367 SIZE_T dest_size = internal_strlen(dest);
368 CHECK_UNPOISONED_STRING(src + src_size, 0);
369 CHECK_UNPOISONED_STRING(dest + dest_size, 0);
370 char *res = REAL(strcat)(dest, src);
371 CopyShadowAndOrigin(dest + dest_size, src, src_size + 1, &stack);
372 return res;
373 }
374
INTERCEPTOR(char *,strncat,char * dest,const char * src,SIZE_T n)375 INTERCEPTOR(char *, strncat, char *dest, const char *src, SIZE_T n) {
376 ENSURE_MSAN_INITED();
377 GET_STORE_STACK_TRACE;
378 SIZE_T dest_size = internal_strlen(dest);
379 SIZE_T copy_size = internal_strnlen(src, n);
380 CHECK_UNPOISONED_STRING(dest + dest_size, 0);
381 char *res = REAL(strncat)(dest, src, n);
382 CopyShadowAndOrigin(dest + dest_size, src, copy_size, &stack);
383 __msan_unpoison(dest + dest_size + copy_size, 1); // \0
384 return res;
385 }
386
387 // Hack: always pass nptr and endptr as part of __VA_ARGS_ to avoid having to
388 // deal with empty __VA_ARGS__ in the case of INTERCEPTOR_STRTO.
389 #define INTERCEPTOR_STRTO_BODY(ret_type, func, ...) \
390 ENSURE_MSAN_INITED(); \
391 ret_type res = REAL(func)(__VA_ARGS__); \
392 __msan_unpoison(endptr, sizeof(*endptr)); \
393 return res;
394
395 #define INTERCEPTOR_STRTO(ret_type, func, char_type) \
396 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr) { \
397 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr); \
398 }
399
400 #define INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
401 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
402 int base) { \
403 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base); \
404 }
405
406 #define INTERCEPTOR_STRTO_LOC(ret_type, func, char_type) \
407 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
408 void *loc) { \
409 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, loc); \
410 }
411
412 #define INTERCEPTOR_STRTO_BASE_LOC(ret_type, func, char_type) \
413 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
414 int base, void *loc) { \
415 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base, loc); \
416 }
417
418 #if SANITIZER_NETBSD
419 #define INTERCEPTORS_STRTO(ret_type, func, char_type) \
420 INTERCEPTOR_STRTO(ret_type, func, char_type) \
421 INTERCEPTOR_STRTO_LOC(ret_type, func##_l, char_type)
422
423 #define INTERCEPTORS_STRTO_BASE(ret_type, func, char_type) \
424 INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
425 INTERCEPTOR_STRTO_BASE_LOC(ret_type, func##_l, char_type)
426
427 #else
428 #define INTERCEPTORS_STRTO(ret_type, func, char_type) \
429 INTERCEPTOR_STRTO(ret_type, func, char_type) \
430 INTERCEPTOR_STRTO_LOC(ret_type, func##_l, char_type) \
431 INTERCEPTOR_STRTO_LOC(ret_type, __##func##_l, char_type) \
432 INTERCEPTOR_STRTO_LOC(ret_type, __##func##_internal, char_type)
433
434 #define INTERCEPTORS_STRTO_BASE(ret_type, func, char_type) \
435 INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
436 INTERCEPTOR_STRTO_BASE_LOC(ret_type, func##_l, char_type) \
437 INTERCEPTOR_STRTO_BASE_LOC(ret_type, __##func##_l, char_type) \
438 INTERCEPTOR_STRTO_BASE_LOC(ret_type, __##func##_internal, char_type)
439 #endif
440
INTERCEPTORS_STRTO(double,strtod,char)441 INTERCEPTORS_STRTO(double, strtod, char)
442 INTERCEPTORS_STRTO(float, strtof, char)
443 INTERCEPTORS_STRTO(long double, strtold, char)
444 INTERCEPTORS_STRTO_BASE(long, strtol, char)
445 INTERCEPTORS_STRTO_BASE(long long, strtoll, char)
446 INTERCEPTORS_STRTO_BASE(unsigned long, strtoul, char)
447 INTERCEPTORS_STRTO_BASE(unsigned long long, strtoull, char)
448 INTERCEPTORS_STRTO_BASE(u64, strtouq, char)
449
450 INTERCEPTORS_STRTO(double, wcstod, wchar_t)
451 INTERCEPTORS_STRTO(float, wcstof, wchar_t)
452 INTERCEPTORS_STRTO(long double, wcstold, wchar_t)
453 INTERCEPTORS_STRTO_BASE(long, wcstol, wchar_t)
454 INTERCEPTORS_STRTO_BASE(long long, wcstoll, wchar_t)
455 INTERCEPTORS_STRTO_BASE(unsigned long, wcstoul, wchar_t)
456 INTERCEPTORS_STRTO_BASE(unsigned long long, wcstoull, wchar_t)
457
458 #if SANITIZER_NETBSD
459 #define INTERCEPT_STRTO(func) \
460 INTERCEPT_FUNCTION(func); \
461 INTERCEPT_FUNCTION(func##_l);
462 #else
463 #define INTERCEPT_STRTO(func) \
464 INTERCEPT_FUNCTION(func); \
465 INTERCEPT_FUNCTION(func##_l); \
466 INTERCEPT_FUNCTION(__##func##_l); \
467 INTERCEPT_FUNCTION(__##func##_internal);
468 #endif
469
470
471 // FIXME: support *wprintf in common format interceptors.
472 INTERCEPTOR(int, vswprintf, void *str, uptr size, void *format, va_list ap) {
473 ENSURE_MSAN_INITED();
474 int res = REAL(vswprintf)(str, size, format, ap);
475 if (res >= 0) {
476 __msan_unpoison(str, 4 * (res + 1));
477 }
478 return res;
479 }
480
INTERCEPTOR(int,swprintf,void * str,uptr size,void * format,...)481 INTERCEPTOR(int, swprintf, void *str, uptr size, void *format, ...) {
482 ENSURE_MSAN_INITED();
483 va_list ap;
484 va_start(ap, format);
485 int res = vswprintf(str, size, format, ap);
486 va_end(ap);
487 return res;
488 }
489
490 #define INTERCEPTOR_STRFTIME_BODY(char_type, ret_type, func, s, ...) \
491 ENSURE_MSAN_INITED(); \
492 InterceptorScope interceptor_scope; \
493 ret_type res = REAL(func)(s, __VA_ARGS__); \
494 if (s) __msan_unpoison(s, sizeof(char_type) * (res + 1)); \
495 return res;
496
INTERCEPTOR(SIZE_T,strftime,char * s,SIZE_T max,const char * format,__sanitizer_tm * tm)497 INTERCEPTOR(SIZE_T, strftime, char *s, SIZE_T max, const char *format,
498 __sanitizer_tm *tm) {
499 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, strftime, s, max, format, tm);
500 }
501
INTERCEPTOR(SIZE_T,strftime_l,char * s,SIZE_T max,const char * format,__sanitizer_tm * tm,void * loc)502 INTERCEPTOR(SIZE_T, strftime_l, char *s, SIZE_T max, const char *format,
503 __sanitizer_tm *tm, void *loc) {
504 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, strftime_l, s, max, format, tm, loc);
505 }
506
507 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(SIZE_T,__strftime_l,char * s,SIZE_T max,const char * format,__sanitizer_tm * tm,void * loc)508 INTERCEPTOR(SIZE_T, __strftime_l, char *s, SIZE_T max, const char *format,
509 __sanitizer_tm *tm, void *loc) {
510 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, __strftime_l, s, max, format, tm,
511 loc);
512 }
513 #define MSAN_MAYBE_INTERCEPT___STRFTIME_L INTERCEPT_FUNCTION(__strftime_l)
514 #else
515 #define MSAN_MAYBE_INTERCEPT___STRFTIME_L
516 #endif
517
INTERCEPTOR(SIZE_T,wcsftime,wchar_t * s,SIZE_T max,const wchar_t * format,__sanitizer_tm * tm)518 INTERCEPTOR(SIZE_T, wcsftime, wchar_t *s, SIZE_T max, const wchar_t *format,
519 __sanitizer_tm *tm) {
520 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, wcsftime, s, max, format, tm);
521 }
522
INTERCEPTOR(SIZE_T,wcsftime_l,wchar_t * s,SIZE_T max,const wchar_t * format,__sanitizer_tm * tm,void * loc)523 INTERCEPTOR(SIZE_T, wcsftime_l, wchar_t *s, SIZE_T max, const wchar_t *format,
524 __sanitizer_tm *tm, void *loc) {
525 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, wcsftime_l, s, max, format, tm,
526 loc);
527 }
528
529 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(SIZE_T,__wcsftime_l,wchar_t * s,SIZE_T max,const wchar_t * format,__sanitizer_tm * tm,void * loc)530 INTERCEPTOR(SIZE_T, __wcsftime_l, wchar_t *s, SIZE_T max, const wchar_t *format,
531 __sanitizer_tm *tm, void *loc) {
532 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, __wcsftime_l, s, max, format, tm,
533 loc);
534 }
535 #define MSAN_MAYBE_INTERCEPT___WCSFTIME_L INTERCEPT_FUNCTION(__wcsftime_l)
536 #else
537 #define MSAN_MAYBE_INTERCEPT___WCSFTIME_L
538 #endif
539
INTERCEPTOR(int,mbtowc,wchar_t * dest,const char * src,SIZE_T n)540 INTERCEPTOR(int, mbtowc, wchar_t *dest, const char *src, SIZE_T n) {
541 ENSURE_MSAN_INITED();
542 int res = REAL(mbtowc)(dest, src, n);
543 if (res != -1 && dest) __msan_unpoison(dest, sizeof(wchar_t));
544 return res;
545 }
546
INTERCEPTOR(SIZE_T,mbrtowc,wchar_t * dest,const char * src,SIZE_T n,void * ps)547 INTERCEPTOR(SIZE_T, mbrtowc, wchar_t *dest, const char *src, SIZE_T n,
548 void *ps) {
549 ENSURE_MSAN_INITED();
550 SIZE_T res = REAL(mbrtowc)(dest, src, n, ps);
551 if (res != (SIZE_T)-1 && dest) __msan_unpoison(dest, sizeof(wchar_t));
552 return res;
553 }
554
555 // wchar_t *wmemcpy(wchar_t *dest, const wchar_t *src, SIZE_T n);
INTERCEPTOR(wchar_t *,wmemcpy,wchar_t * dest,const wchar_t * src,SIZE_T n)556 INTERCEPTOR(wchar_t *, wmemcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
557 ENSURE_MSAN_INITED();
558 GET_STORE_STACK_TRACE;
559 wchar_t *res = REAL(wmemcpy)(dest, src, n);
560 CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
561 return res;
562 }
563
564 #if !SANITIZER_NETBSD
INTERCEPTOR(wchar_t *,wmempcpy,wchar_t * dest,const wchar_t * src,SIZE_T n)565 INTERCEPTOR(wchar_t *, wmempcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
566 ENSURE_MSAN_INITED();
567 GET_STORE_STACK_TRACE;
568 wchar_t *res = REAL(wmempcpy)(dest, src, n);
569 CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
570 return res;
571 }
572 #define MSAN_MAYBE_INTERCEPT_WMEMPCPY INTERCEPT_FUNCTION(wmempcpy)
573 #else
574 #define MSAN_MAYBE_INTERCEPT_WMEMPCPY
575 #endif
576
INTERCEPTOR(wchar_t *,wmemset,wchar_t * s,wchar_t c,SIZE_T n)577 INTERCEPTOR(wchar_t *, wmemset, wchar_t *s, wchar_t c, SIZE_T n) {
578 CHECK(MEM_IS_APP(s));
579 ENSURE_MSAN_INITED();
580 wchar_t *res = REAL(wmemset)(s, c, n);
581 __msan_unpoison(s, n * sizeof(wchar_t));
582 return res;
583 }
584
INTERCEPTOR(wchar_t *,wmemmove,wchar_t * dest,const wchar_t * src,SIZE_T n)585 INTERCEPTOR(wchar_t *, wmemmove, wchar_t *dest, const wchar_t *src, SIZE_T n) {
586 ENSURE_MSAN_INITED();
587 GET_STORE_STACK_TRACE;
588 wchar_t *res = REAL(wmemmove)(dest, src, n);
589 MoveShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
590 return res;
591 }
592
INTERCEPTOR(int,wcscmp,const wchar_t * s1,const wchar_t * s2)593 INTERCEPTOR(int, wcscmp, const wchar_t *s1, const wchar_t *s2) {
594 ENSURE_MSAN_INITED();
595 int res = REAL(wcscmp)(s1, s2);
596 return res;
597 }
598
INTERCEPTOR(int,gettimeofday,void * tv,void * tz)599 INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
600 ENSURE_MSAN_INITED();
601 int res = REAL(gettimeofday)(tv, tz);
602 if (tv)
603 __msan_unpoison(tv, 16);
604 if (tz)
605 __msan_unpoison(tz, 8);
606 return res;
607 }
608
609 #if !SANITIZER_NETBSD
INTERCEPTOR(char *,fcvt,double x,int a,int * b,int * c)610 INTERCEPTOR(char *, fcvt, double x, int a, int *b, int *c) {
611 ENSURE_MSAN_INITED();
612 char *res = REAL(fcvt)(x, a, b, c);
613 __msan_unpoison(b, sizeof(*b));
614 __msan_unpoison(c, sizeof(*c));
615 if (res)
616 __msan_unpoison(res, internal_strlen(res) + 1);
617 return res;
618 }
619 #define MSAN_MAYBE_INTERCEPT_FCVT INTERCEPT_FUNCTION(fcvt)
620 #else
621 #define MSAN_MAYBE_INTERCEPT_FCVT
622 #endif
623
INTERCEPTOR(char *,getenv,char * name)624 INTERCEPTOR(char *, getenv, char *name) {
625 if (msan_init_is_running)
626 return REAL(getenv)(name);
627 ENSURE_MSAN_INITED();
628 char *res = REAL(getenv)(name);
629 if (res)
630 __msan_unpoison(res, internal_strlen(res) + 1);
631 return res;
632 }
633
634 extern char **environ;
635
UnpoisonEnviron()636 static void UnpoisonEnviron() {
637 char **envp = environ;
638 for (; *envp; ++envp) {
639 __msan_unpoison(envp, sizeof(*envp));
640 __msan_unpoison(*envp, internal_strlen(*envp) + 1);
641 }
642 // Trailing NULL pointer.
643 __msan_unpoison(envp, sizeof(*envp));
644 }
645
INTERCEPTOR(int,setenv,const char * name,const char * value,int overwrite)646 INTERCEPTOR(int, setenv, const char *name, const char *value, int overwrite) {
647 ENSURE_MSAN_INITED();
648 CHECK_UNPOISONED_STRING(name, 0);
649 int res = REAL(setenv)(name, value, overwrite);
650 if (!res) UnpoisonEnviron();
651 return res;
652 }
653
INTERCEPTOR(int,putenv,char * string)654 INTERCEPTOR(int, putenv, char *string) {
655 ENSURE_MSAN_INITED();
656 int res = REAL(putenv)(string);
657 if (!res) UnpoisonEnviron();
658 return res;
659 }
660
661 #if SANITIZER_FREEBSD || SANITIZER_NETBSD
INTERCEPTOR(int,fstat,int fd,void * buf)662 INTERCEPTOR(int, fstat, int fd, void *buf) {
663 ENSURE_MSAN_INITED();
664 int res = REAL(fstat)(fd, buf);
665 if (!res)
666 __msan_unpoison(buf, __sanitizer::struct_stat_sz);
667 return res;
668 }
669 #define MSAN_MAYBE_INTERCEPT_FSTAT INTERCEPT_FUNCTION(fstat)
670 #else
671 #define MSAN_MAYBE_INTERCEPT_FSTAT
672 #endif
673
674 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(int,__fxstat,int magic,int fd,void * buf)675 INTERCEPTOR(int, __fxstat, int magic, int fd, void *buf) {
676 ENSURE_MSAN_INITED();
677 int res = REAL(__fxstat)(magic, fd, buf);
678 if (!res)
679 __msan_unpoison(buf, __sanitizer::struct_stat_sz);
680 return res;
681 }
682 #define MSAN_MAYBE_INTERCEPT___FXSTAT INTERCEPT_FUNCTION(__fxstat)
683 #else
684 #define MSAN_MAYBE_INTERCEPT___FXSTAT
685 #endif
686
687 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(int,__fxstat64,int magic,int fd,void * buf)688 INTERCEPTOR(int, __fxstat64, int magic, int fd, void *buf) {
689 ENSURE_MSAN_INITED();
690 int res = REAL(__fxstat64)(magic, fd, buf);
691 if (!res)
692 __msan_unpoison(buf, __sanitizer::struct_stat64_sz);
693 return res;
694 }
695 #define MSAN_MAYBE_INTERCEPT___FXSTAT64 INTERCEPT_FUNCTION(__fxstat64)
696 #else
697 #define MSAN_MAYBE_INTERCEPT___FXSTAT64
698 #endif
699
700 #if SANITIZER_FREEBSD || SANITIZER_NETBSD
INTERCEPTOR(int,fstatat,int fd,char * pathname,void * buf,int flags)701 INTERCEPTOR(int, fstatat, int fd, char *pathname, void *buf, int flags) {
702 ENSURE_MSAN_INITED();
703 int res = REAL(fstatat)(fd, pathname, buf, flags);
704 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz);
705 return res;
706 }
707 # define MSAN_INTERCEPT_FSTATAT INTERCEPT_FUNCTION(fstatat)
708 #else
INTERCEPTOR(int,__fxstatat,int magic,int fd,char * pathname,void * buf,int flags)709 INTERCEPTOR(int, __fxstatat, int magic, int fd, char *pathname, void *buf,
710 int flags) {
711 ENSURE_MSAN_INITED();
712 int res = REAL(__fxstatat)(magic, fd, pathname, buf, flags);
713 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz);
714 return res;
715 }
716 # define MSAN_INTERCEPT_FSTATAT INTERCEPT_FUNCTION(__fxstatat)
717 #endif
718
719 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(int,__fxstatat64,int magic,int fd,char * pathname,void * buf,int flags)720 INTERCEPTOR(int, __fxstatat64, int magic, int fd, char *pathname, void *buf,
721 int flags) {
722 ENSURE_MSAN_INITED();
723 int res = REAL(__fxstatat64)(magic, fd, pathname, buf, flags);
724 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat64_sz);
725 return res;
726 }
727 #define MSAN_MAYBE_INTERCEPT___FXSTATAT64 INTERCEPT_FUNCTION(__fxstatat64)
728 #else
729 #define MSAN_MAYBE_INTERCEPT___FXSTATAT64
730 #endif
731
INTERCEPTOR(int,pipe,int pipefd[2])732 INTERCEPTOR(int, pipe, int pipefd[2]) {
733 if (msan_init_is_running)
734 return REAL(pipe)(pipefd);
735 ENSURE_MSAN_INITED();
736 int res = REAL(pipe)(pipefd);
737 if (!res)
738 __msan_unpoison(pipefd, sizeof(int[2]));
739 return res;
740 }
741
INTERCEPTOR(int,pipe2,int pipefd[2],int flags)742 INTERCEPTOR(int, pipe2, int pipefd[2], int flags) {
743 ENSURE_MSAN_INITED();
744 int res = REAL(pipe2)(pipefd, flags);
745 if (!res)
746 __msan_unpoison(pipefd, sizeof(int[2]));
747 return res;
748 }
749
INTERCEPTOR(int,socketpair,int domain,int type,int protocol,int sv[2])750 INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int sv[2]) {
751 ENSURE_MSAN_INITED();
752 int res = REAL(socketpair)(domain, type, protocol, sv);
753 if (!res)
754 __msan_unpoison(sv, sizeof(int[2]));
755 return res;
756 }
757
758 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(char *,fgets_unlocked,char * s,int size,void * stream)759 INTERCEPTOR(char *, fgets_unlocked, char *s, int size, void *stream) {
760 ENSURE_MSAN_INITED();
761 char *res = REAL(fgets_unlocked)(s, size, stream);
762 if (res)
763 __msan_unpoison(s, internal_strlen(s) + 1);
764 return res;
765 }
766 #define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED INTERCEPT_FUNCTION(fgets_unlocked)
767 #else
768 #define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED
769 #endif
770
771 #define INTERCEPTOR_GETRLIMIT_BODY(func, resource, rlim) \
772 if (msan_init_is_running) \
773 return REAL(getrlimit)(resource, rlim); \
774 ENSURE_MSAN_INITED(); \
775 int res = REAL(func)(resource, rlim); \
776 if (!res) \
777 __msan_unpoison(rlim, __sanitizer::struct_rlimit_sz); \
778 return res
779
INTERCEPTOR(int,getrlimit,int resource,void * rlim)780 INTERCEPTOR(int, getrlimit, int resource, void *rlim) {
781 INTERCEPTOR_GETRLIMIT_BODY(getrlimit, resource, rlim);
782 }
783
784 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(int,__getrlimit,int resource,void * rlim)785 INTERCEPTOR(int, __getrlimit, int resource, void *rlim) {
786 INTERCEPTOR_GETRLIMIT_BODY(__getrlimit, resource, rlim);
787 }
788
INTERCEPTOR(int,getrlimit64,int resource,void * rlim)789 INTERCEPTOR(int, getrlimit64, int resource, void *rlim) {
790 if (msan_init_is_running) return REAL(getrlimit64)(resource, rlim);
791 ENSURE_MSAN_INITED();
792 int res = REAL(getrlimit64)(resource, rlim);
793 if (!res) __msan_unpoison(rlim, __sanitizer::struct_rlimit64_sz);
794 return res;
795 }
796
INTERCEPTOR(int,prlimit,int pid,int resource,void * new_rlimit,void * old_rlimit)797 INTERCEPTOR(int, prlimit, int pid, int resource, void *new_rlimit,
798 void *old_rlimit) {
799 if (msan_init_is_running)
800 return REAL(prlimit)(pid, resource, new_rlimit, old_rlimit);
801 ENSURE_MSAN_INITED();
802 CHECK_UNPOISONED(new_rlimit, __sanitizer::struct_rlimit_sz);
803 int res = REAL(prlimit)(pid, resource, new_rlimit, old_rlimit);
804 if (!res) __msan_unpoison(old_rlimit, __sanitizer::struct_rlimit_sz);
805 return res;
806 }
807
INTERCEPTOR(int,prlimit64,int pid,int resource,void * new_rlimit,void * old_rlimit)808 INTERCEPTOR(int, prlimit64, int pid, int resource, void *new_rlimit,
809 void *old_rlimit) {
810 if (msan_init_is_running)
811 return REAL(prlimit64)(pid, resource, new_rlimit, old_rlimit);
812 ENSURE_MSAN_INITED();
813 CHECK_UNPOISONED(new_rlimit, __sanitizer::struct_rlimit64_sz);
814 int res = REAL(prlimit64)(pid, resource, new_rlimit, old_rlimit);
815 if (!res) __msan_unpoison(old_rlimit, __sanitizer::struct_rlimit64_sz);
816 return res;
817 }
818
819 #define MSAN_MAYBE_INTERCEPT___GETRLIMIT INTERCEPT_FUNCTION(__getrlimit)
820 #define MSAN_MAYBE_INTERCEPT_GETRLIMIT64 INTERCEPT_FUNCTION(getrlimit64)
821 #define MSAN_MAYBE_INTERCEPT_PRLIMIT INTERCEPT_FUNCTION(prlimit)
822 #define MSAN_MAYBE_INTERCEPT_PRLIMIT64 INTERCEPT_FUNCTION(prlimit64)
823 #else
824 #define MSAN_MAYBE_INTERCEPT___GETRLIMIT
825 #define MSAN_MAYBE_INTERCEPT_GETRLIMIT64
826 #define MSAN_MAYBE_INTERCEPT_PRLIMIT
827 #define MSAN_MAYBE_INTERCEPT_PRLIMIT64
828 #endif
829
INTERCEPTOR(int,gethostname,char * name,SIZE_T len)830 INTERCEPTOR(int, gethostname, char *name, SIZE_T len) {
831 ENSURE_MSAN_INITED();
832 int res = REAL(gethostname)(name, len);
833 if (!res || (res == -1 && errno == errno_ENAMETOOLONG)) {
834 SIZE_T real_len = internal_strnlen(name, len);
835 if (real_len < len)
836 ++real_len;
837 __msan_unpoison(name, real_len);
838 }
839 return res;
840 }
841
842 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(int,epoll_wait,int epfd,void * events,int maxevents,int timeout)843 INTERCEPTOR(int, epoll_wait, int epfd, void *events, int maxevents,
844 int timeout) {
845 ENSURE_MSAN_INITED();
846 int res = REAL(epoll_wait)(epfd, events, maxevents, timeout);
847 if (res > 0) {
848 __msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res);
849 }
850 return res;
851 }
852 #define MSAN_MAYBE_INTERCEPT_EPOLL_WAIT INTERCEPT_FUNCTION(epoll_wait)
853 #else
854 #define MSAN_MAYBE_INTERCEPT_EPOLL_WAIT
855 #endif
856
857 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(int,epoll_pwait,int epfd,void * events,int maxevents,int timeout,void * sigmask)858 INTERCEPTOR(int, epoll_pwait, int epfd, void *events, int maxevents,
859 int timeout, void *sigmask) {
860 ENSURE_MSAN_INITED();
861 int res = REAL(epoll_pwait)(epfd, events, maxevents, timeout, sigmask);
862 if (res > 0) {
863 __msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res);
864 }
865 return res;
866 }
867 #define MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT INTERCEPT_FUNCTION(epoll_pwait)
868 #else
869 #define MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT
870 #endif
871
INTERCEPTOR(void *,calloc,SIZE_T nmemb,SIZE_T size)872 INTERCEPTOR(void *, calloc, SIZE_T nmemb, SIZE_T size) {
873 GET_MALLOC_STACK_TRACE;
874 if (UNLIKELY(!msan_inited))
875 // Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym.
876 return AllocateFromLocalPool(nmemb * size);
877 return msan_calloc(nmemb, size, &stack);
878 }
879
INTERCEPTOR(void *,realloc,void * ptr,SIZE_T size)880 INTERCEPTOR(void *, realloc, void *ptr, SIZE_T size) {
881 GET_MALLOC_STACK_TRACE;
882 if (UNLIKELY(IsInDlsymAllocPool(ptr))) {
883 uptr offset = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
884 uptr copy_size = Min(size, kDlsymAllocPoolSize - offset);
885 void *new_ptr;
886 if (UNLIKELY(!msan_inited)) {
887 new_ptr = AllocateFromLocalPool(copy_size);
888 } else {
889 copy_size = size;
890 new_ptr = msan_malloc(copy_size, &stack);
891 }
892 internal_memcpy(new_ptr, ptr, copy_size);
893 return new_ptr;
894 }
895 return msan_realloc(ptr, size, &stack);
896 }
897
INTERCEPTOR(void *,reallocarray,void * ptr,SIZE_T nmemb,SIZE_T size)898 INTERCEPTOR(void *, reallocarray, void *ptr, SIZE_T nmemb, SIZE_T size) {
899 GET_MALLOC_STACK_TRACE;
900 return msan_reallocarray(ptr, nmemb, size, &stack);
901 }
902
INTERCEPTOR(void *,malloc,SIZE_T size)903 INTERCEPTOR(void *, malloc, SIZE_T size) {
904 GET_MALLOC_STACK_TRACE;
905 if (UNLIKELY(!msan_inited))
906 // Hack: dlsym calls malloc before REAL(malloc) is retrieved from dlsym.
907 return AllocateFromLocalPool(size);
908 return msan_malloc(size, &stack);
909 }
910
__msan_allocated_memory(const void * data,uptr size)911 void __msan_allocated_memory(const void *data, uptr size) {
912 GET_MALLOC_STACK_TRACE;
913 if (flags()->poison_in_malloc) {
914 stack.tag = STACK_TRACE_TAG_POISON;
915 PoisonMemory(data, size, &stack);
916 }
917 }
918
__msan_copy_shadow(void * dest,const void * src,uptr n)919 void __msan_copy_shadow(void *dest, const void *src, uptr n) {
920 GET_STORE_STACK_TRACE;
921 MoveShadowAndOrigin(dest, src, n, &stack);
922 }
923
__sanitizer_dtor_callback(const void * data,uptr size)924 void __sanitizer_dtor_callback(const void *data, uptr size) {
925 GET_MALLOC_STACK_TRACE;
926 if (flags()->poison_in_dtor) {
927 stack.tag = STACK_TRACE_TAG_POISON;
928 PoisonMemory(data, size, &stack);
929 }
930 }
931
932 template <class Mmap>
mmap_interceptor(Mmap real_mmap,void * addr,SIZE_T length,int prot,int flags,int fd,OFF64_T offset)933 static void *mmap_interceptor(Mmap real_mmap, void *addr, SIZE_T length,
934 int prot, int flags, int fd, OFF64_T offset) {
935 SIZE_T rounded_length = RoundUpTo(length, GetPageSize());
936 void *end_addr = (char *)addr + (rounded_length - 1);
937 if (addr && (!MEM_IS_APP(addr) || !MEM_IS_APP(end_addr))) {
938 if (flags & map_fixed) {
939 errno = errno_EINVAL;
940 return (void *)-1;
941 } else {
942 addr = nullptr;
943 }
944 }
945 void *res = real_mmap(addr, length, prot, flags, fd, offset);
946 if (res != (void *)-1) {
947 void *end_res = (char *)res + (rounded_length - 1);
948 if (MEM_IS_APP(res) && MEM_IS_APP(end_res)) {
949 __msan_unpoison(res, rounded_length);
950 } else {
951 // Application has attempted to map more memory than is supported by
952 // MSAN. Act as if we ran out of memory.
953 internal_munmap(res, length);
954 errno = errno_ENOMEM;
955 return (void *)-1;
956 }
957 }
958 return res;
959 }
960
INTERCEPTOR(int,getrusage,int who,void * usage)961 INTERCEPTOR(int, getrusage, int who, void *usage) {
962 ENSURE_MSAN_INITED();
963 int res = REAL(getrusage)(who, usage);
964 if (res == 0) {
965 __msan_unpoison(usage, __sanitizer::struct_rusage_sz);
966 }
967 return res;
968 }
969
970 class SignalHandlerScope {
971 public:
SignalHandlerScope()972 SignalHandlerScope() {
973 if (MsanThread *t = GetCurrentThread())
974 t->EnterSignalHandler();
975 }
~SignalHandlerScope()976 ~SignalHandlerScope() {
977 if (MsanThread *t = GetCurrentThread())
978 t->LeaveSignalHandler();
979 }
980 };
981
982 // sigactions_mu guarantees atomicity of sigaction() and signal() calls.
983 // Access to sigactions[] is gone with relaxed atomics to avoid data race with
984 // the signal handler.
985 const int kMaxSignals = 1024;
986 static atomic_uintptr_t sigactions[kMaxSignals];
987 static StaticSpinMutex sigactions_mu;
988
SignalHandler(int signo)989 static void SignalHandler(int signo) {
990 SignalHandlerScope signal_handler_scope;
991 ScopedThreadLocalStateBackup stlsb;
992 UnpoisonParam(1);
993
994 typedef void (*signal_cb)(int x);
995 signal_cb cb =
996 (signal_cb)atomic_load(&sigactions[signo], memory_order_relaxed);
997 cb(signo);
998 }
999
SignalAction(int signo,void * si,void * uc)1000 static void SignalAction(int signo, void *si, void *uc) {
1001 SignalHandlerScope signal_handler_scope;
1002 ScopedThreadLocalStateBackup stlsb;
1003 UnpoisonParam(3);
1004 __msan_unpoison(si, sizeof(__sanitizer_sigaction));
1005 __msan_unpoison(uc, __sanitizer::ucontext_t_sz);
1006
1007 typedef void (*sigaction_cb)(int, void *, void *);
1008 sigaction_cb cb =
1009 (sigaction_cb)atomic_load(&sigactions[signo], memory_order_relaxed);
1010 cb(signo, si, uc);
1011 }
1012
read_sigaction(const __sanitizer_sigaction * act)1013 static void read_sigaction(const __sanitizer_sigaction *act) {
1014 CHECK_UNPOISONED(&act->sa_flags, sizeof(act->sa_flags));
1015 if (act->sa_flags & __sanitizer::sa_siginfo)
1016 CHECK_UNPOISONED(&act->sigaction, sizeof(act->sigaction));
1017 else
1018 CHECK_UNPOISONED(&act->handler, sizeof(act->handler));
1019 CHECK_UNPOISONED(&act->sa_mask, sizeof(act->sa_mask));
1020 }
1021
1022 extern "C" int pthread_attr_init(void *attr);
1023 extern "C" int pthread_attr_destroy(void *attr);
1024
MsanThreadStartFunc(void * arg)1025 static void *MsanThreadStartFunc(void *arg) {
1026 MsanThread *t = (MsanThread *)arg;
1027 SetCurrentThread(t);
1028 return t->ThreadStart();
1029 }
1030
INTERCEPTOR(int,pthread_create,void * th,void * attr,void * (* callback)(void *),void * param)1031 INTERCEPTOR(int, pthread_create, void *th, void *attr, void *(*callback)(void*),
1032 void * param) {
1033 ENSURE_MSAN_INITED(); // for GetTlsSize()
1034 __sanitizer_pthread_attr_t myattr;
1035 if (!attr) {
1036 pthread_attr_init(&myattr);
1037 attr = &myattr;
1038 }
1039
1040 AdjustStackSize(attr);
1041
1042 MsanThread *t = MsanThread::Create(callback, param);
1043
1044 int res = REAL(pthread_create)(th, attr, MsanThreadStartFunc, t);
1045
1046 if (attr == &myattr)
1047 pthread_attr_destroy(&myattr);
1048 if (!res) {
1049 __msan_unpoison(th, __sanitizer::pthread_t_sz);
1050 }
1051 return res;
1052 }
1053
INTERCEPTOR(int,pthread_key_create,__sanitizer_pthread_key_t * key,void (* dtor)(void * value))1054 INTERCEPTOR(int, pthread_key_create, __sanitizer_pthread_key_t *key,
1055 void (*dtor)(void *value)) {
1056 if (msan_init_is_running) return REAL(pthread_key_create)(key, dtor);
1057 ENSURE_MSAN_INITED();
1058 int res = REAL(pthread_key_create)(key, dtor);
1059 if (!res && key)
1060 __msan_unpoison(key, sizeof(*key));
1061 return res;
1062 }
1063
1064 #if SANITIZER_NETBSD
1065 INTERCEPTOR(int, __libc_thr_keycreate, __sanitizer_pthread_key_t *m,
1066 void (*dtor)(void *value))
1067 ALIAS(WRAPPER_NAME(pthread_key_create));
1068 #endif
1069
INTERCEPTOR(int,pthread_join,void * th,void ** retval)1070 INTERCEPTOR(int, pthread_join, void *th, void **retval) {
1071 ENSURE_MSAN_INITED();
1072 int res = REAL(pthread_join)(th, retval);
1073 if (!res && retval)
1074 __msan_unpoison(retval, sizeof(*retval));
1075 return res;
1076 }
1077
1078 extern char *tzname[2];
1079
INTERCEPTOR(void,tzset,int fake)1080 INTERCEPTOR(void, tzset, int fake) {
1081 ENSURE_MSAN_INITED();
1082 InterceptorScope interceptor_scope;
1083 REAL(tzset)(fake);
1084 if (tzname[0])
1085 __msan_unpoison(tzname[0], internal_strlen(tzname[0]) + 1);
1086 if (tzname[1])
1087 __msan_unpoison(tzname[1], internal_strlen(tzname[1]) + 1);
1088 return;
1089 }
1090
1091 struct MSanAtExitRecord {
1092 void (*func)(void *arg);
1093 void *arg;
1094 };
1095
1096 struct InterceptorContext {
1097 Mutex atexit_mu;
1098 Vector<struct MSanAtExitRecord *> AtExitStack;
1099
InterceptorContextInterceptorContext1100 InterceptorContext()
1101 : AtExitStack() {
1102 }
1103 };
1104
1105 static ALIGNED(64) char interceptor_placeholder[sizeof(InterceptorContext)];
interceptor_ctx()1106 InterceptorContext *interceptor_ctx() {
1107 return reinterpret_cast<InterceptorContext*>(&interceptor_placeholder[0]);
1108 }
1109
MSanAtExitWrapper()1110 void MSanAtExitWrapper() {
1111 MSanAtExitRecord *r;
1112 {
1113 Lock l(&interceptor_ctx()->atexit_mu);
1114
1115 uptr element = interceptor_ctx()->AtExitStack.Size() - 1;
1116 r = interceptor_ctx()->AtExitStack[element];
1117 interceptor_ctx()->AtExitStack.PopBack();
1118 }
1119
1120 UnpoisonParam(1);
1121 ((void(*)())r->func)();
1122 InternalFree(r);
1123 }
1124
MSanCxaAtExitWrapper(void * arg)1125 void MSanCxaAtExitWrapper(void *arg) {
1126 UnpoisonParam(1);
1127 MSanAtExitRecord *r = (MSanAtExitRecord *)arg;
1128 // libc before 2.27 had race which caused occasional double handler execution
1129 // https://sourceware.org/ml/libc-alpha/2017-08/msg01204.html
1130 if (!r->func)
1131 return;
1132 r->func(r->arg);
1133 r->func = nullptr;
1134 }
1135
1136 static int setup_at_exit_wrapper(void(*f)(), void *arg, void *dso);
1137
1138 // Unpoison argument shadow for C++ module destructors.
INTERCEPTOR(int,__cxa_atexit,void (* func)(void *),void * arg,void * dso_handle)1139 INTERCEPTOR(int, __cxa_atexit, void (*func)(void *), void *arg,
1140 void *dso_handle) {
1141 if (msan_init_is_running) return REAL(__cxa_atexit)(func, arg, dso_handle);
1142 return setup_at_exit_wrapper((void(*)())func, arg, dso_handle);
1143 }
1144
1145 // Unpoison argument shadow for C++ module destructors.
INTERCEPTOR(int,atexit,void (* func)())1146 INTERCEPTOR(int, atexit, void (*func)()) {
1147 // Avoid calling real atexit as it is unreachable on at least on Linux.
1148 if (msan_init_is_running)
1149 return REAL(__cxa_atexit)((void (*)(void *a))func, 0, 0);
1150 return setup_at_exit_wrapper((void(*)())func, 0, 0);
1151 }
1152
setup_at_exit_wrapper(void (* f)(),void * arg,void * dso)1153 static int setup_at_exit_wrapper(void(*f)(), void *arg, void *dso) {
1154 ENSURE_MSAN_INITED();
1155 MSanAtExitRecord *r =
1156 (MSanAtExitRecord *)InternalAlloc(sizeof(MSanAtExitRecord));
1157 r->func = (void(*)(void *a))f;
1158 r->arg = arg;
1159 int res;
1160 if (!dso) {
1161 // NetBSD does not preserve the 2nd argument if dso is equal to 0
1162 // Store ctx in a local stack-like structure
1163
1164 Lock l(&interceptor_ctx()->atexit_mu);
1165
1166 res = REAL(__cxa_atexit)((void (*)(void *a))MSanAtExitWrapper, 0, 0);
1167 if (!res) {
1168 interceptor_ctx()->AtExitStack.PushBack(r);
1169 }
1170 } else {
1171 res = REAL(__cxa_atexit)(MSanCxaAtExitWrapper, r, dso);
1172 }
1173 return res;
1174 }
1175
BeforeFork()1176 static void BeforeFork() {
1177 StackDepotLockAll();
1178 ChainedOriginDepotLockAll();
1179 }
1180
AfterFork()1181 static void AfterFork() {
1182 ChainedOriginDepotUnlockAll();
1183 StackDepotUnlockAll();
1184 }
1185
INTERCEPTOR(int,fork,void)1186 INTERCEPTOR(int, fork, void) {
1187 ENSURE_MSAN_INITED();
1188 BeforeFork();
1189 int pid = REAL(fork)();
1190 AfterFork();
1191 return pid;
1192 }
1193
1194 // NetBSD ships with openpty(3) in -lutil, that needs to be prebuilt explicitly
1195 // with MSan.
1196 #if SANITIZER_LINUX
INTERCEPTOR(int,openpty,int * aparent,int * aworker,char * name,const void * termp,const void * winp)1197 INTERCEPTOR(int, openpty, int *aparent, int *aworker, char *name,
1198 const void *termp, const void *winp) {
1199 ENSURE_MSAN_INITED();
1200 InterceptorScope interceptor_scope;
1201 int res = REAL(openpty)(aparent, aworker, name, termp, winp);
1202 if (!res) {
1203 __msan_unpoison(aparent, sizeof(*aparent));
1204 __msan_unpoison(aworker, sizeof(*aworker));
1205 }
1206 return res;
1207 }
1208 #define MSAN_MAYBE_INTERCEPT_OPENPTY INTERCEPT_FUNCTION(openpty)
1209 #else
1210 #define MSAN_MAYBE_INTERCEPT_OPENPTY
1211 #endif
1212
1213 // NetBSD ships with forkpty(3) in -lutil, that needs to be prebuilt explicitly
1214 // with MSan.
1215 #if SANITIZER_LINUX
INTERCEPTOR(int,forkpty,int * aparent,char * name,const void * termp,const void * winp)1216 INTERCEPTOR(int, forkpty, int *aparent, char *name, const void *termp,
1217 const void *winp) {
1218 ENSURE_MSAN_INITED();
1219 InterceptorScope interceptor_scope;
1220 int res = REAL(forkpty)(aparent, name, termp, winp);
1221 if (res != -1)
1222 __msan_unpoison(aparent, sizeof(*aparent));
1223 return res;
1224 }
1225 #define MSAN_MAYBE_INTERCEPT_FORKPTY INTERCEPT_FUNCTION(forkpty)
1226 #else
1227 #define MSAN_MAYBE_INTERCEPT_FORKPTY
1228 #endif
1229
1230 struct MSanInterceptorContext {
1231 bool in_interceptor_scope;
1232 };
1233
1234 namespace __msan {
1235
OnExit()1236 int OnExit() {
1237 // FIXME: ask frontend whether we need to return failure.
1238 return 0;
1239 }
1240
1241 } // namespace __msan
1242
1243 // A version of CHECK_UNPOISONED using a saved scope value. Used in common
1244 // interceptors.
1245 #define CHECK_UNPOISONED_CTX(ctx, x, n) \
1246 do { \
1247 if (!((MSanInterceptorContext *)ctx)->in_interceptor_scope) \
1248 CHECK_UNPOISONED_0(x, n); \
1249 } while (0)
1250
1251 #define MSAN_INTERCEPT_FUNC(name) \
1252 do { \
1253 if (!INTERCEPT_FUNCTION(name)) \
1254 VReport(1, "MemorySanitizer: failed to intercept '%s'\n", #name); \
1255 } while (0)
1256
1257 #define MSAN_INTERCEPT_FUNC_VER(name, ver) \
1258 do { \
1259 if (!INTERCEPT_FUNCTION_VER(name, ver)) \
1260 VReport(1, "MemorySanitizer: failed to intercept '%s@@%s'\n", #name, \
1261 ver); \
1262 } while (0)
1263 #define MSAN_INTERCEPT_FUNC_VER_UNVERSIONED_FALLBACK(name, ver) \
1264 do { \
1265 if (!INTERCEPT_FUNCTION_VER(name, ver) && !INTERCEPT_FUNCTION(name)) \
1266 VReport(1, "MemorySanitizer: failed to intercept '%s@@%s' or '%s'\n", \
1267 #name, ver, #name); \
1268 } while (0)
1269
1270 #define COMMON_INTERCEPT_FUNCTION(name) MSAN_INTERCEPT_FUNC(name)
1271 #define COMMON_INTERCEPT_FUNCTION_VER(name, ver) \
1272 MSAN_INTERCEPT_FUNC_VER(name, ver)
1273 #define COMMON_INTERCEPT_FUNCTION_VER_UNVERSIONED_FALLBACK(name, ver) \
1274 MSAN_INTERCEPT_FUNC_VER_UNVERSIONED_FALLBACK(name, ver)
1275 #define COMMON_INTERCEPTOR_UNPOISON_PARAM(count) \
1276 UnpoisonParam(count)
1277 #define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \
1278 __msan_unpoison(ptr, size)
1279 #define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \
1280 CHECK_UNPOISONED_CTX(ctx, ptr, size)
1281 #define COMMON_INTERCEPTOR_INITIALIZE_RANGE(ptr, size) \
1282 __msan_unpoison(ptr, size)
1283 #define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \
1284 if (msan_init_is_running) \
1285 return REAL(func)(__VA_ARGS__); \
1286 ENSURE_MSAN_INITED(); \
1287 MSanInterceptorContext msan_ctx = {IsInInterceptorScope()}; \
1288 ctx = (void *)&msan_ctx; \
1289 (void)ctx; \
1290 InterceptorScope interceptor_scope; \
1291 __msan_unpoison(__errno_location(), sizeof(int));
1292 #define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
1293 do { \
1294 } while (false)
1295 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
1296 do { \
1297 } while (false)
1298 #define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
1299 do { \
1300 } while (false)
1301 #define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
1302 do { \
1303 } while (false)
1304 #define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
1305 do { \
1306 } while (false) // FIXME
1307 #define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \
1308 do { \
1309 } while (false) // FIXME
1310 #define COMMON_INTERCEPTOR_BLOCK_REAL(name) REAL(name)
1311 #define COMMON_INTERCEPTOR_ON_EXIT(ctx) OnExit()
1312 #define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) \
1313 do { \
1314 link_map *map = GET_LINK_MAP_BY_DLOPEN_HANDLE((handle)); \
1315 if (filename && map) \
1316 ForEachMappedRegion(map, __msan_unpoison); \
1317 } while (false)
1318
1319 #define COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED (!msan_inited)
1320
1321 #define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \
1322 if (MsanThread *t = GetCurrentThread()) { \
1323 *begin = t->tls_begin(); \
1324 *end = t->tls_end(); \
1325 } else { \
1326 *begin = *end = 0; \
1327 }
1328
1329 #define COMMON_INTERCEPTOR_MEMSET_IMPL(ctx, block, c, size) \
1330 { \
1331 (void)ctx; \
1332 return __msan_memset(block, c, size); \
1333 }
1334 #define COMMON_INTERCEPTOR_MEMMOVE_IMPL(ctx, to, from, size) \
1335 { \
1336 (void)ctx; \
1337 return __msan_memmove(to, from, size); \
1338 }
1339 #define COMMON_INTERCEPTOR_MEMCPY_IMPL(ctx, to, from, size) \
1340 { \
1341 (void)ctx; \
1342 return __msan_memcpy(to, from, size); \
1343 }
1344
1345 #define COMMON_INTERCEPTOR_COPY_STRING(ctx, to, from, size) \
1346 do { \
1347 GET_STORE_STACK_TRACE; \
1348 CopyShadowAndOrigin(to, from, size, &stack); \
1349 __msan_unpoison(to + size, 1); \
1350 } while (false)
1351
1352 #define COMMON_INTERCEPTOR_MMAP_IMPL(ctx, mmap, addr, length, prot, flags, fd, \
1353 offset) \
1354 do { \
1355 return mmap_interceptor(REAL(mmap), addr, sz, prot, flags, fd, off); \
1356 } while (false)
1357
1358 #include "sanitizer_common/sanitizer_platform_interceptors.h"
1359 #include "sanitizer_common/sanitizer_common_interceptors.inc"
1360
1361 static uptr signal_impl(int signo, uptr cb);
1362 static int sigaction_impl(int signo, const __sanitizer_sigaction *act,
1363 __sanitizer_sigaction *oldact);
1364
1365 #define SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signo, act, oldact) \
1366 { return sigaction_impl(signo, act, oldact); }
1367
1368 #define SIGNAL_INTERCEPTOR_SIGNAL_IMPL(func, signo, handler) \
1369 { \
1370 handler = signal_impl(signo, handler); \
1371 InterceptorScope interceptor_scope; \
1372 return REAL(func)(signo, handler); \
1373 }
1374
1375 #include "sanitizer_common/sanitizer_signal_interceptors.inc"
1376
sigaction_impl(int signo,const __sanitizer_sigaction * act,__sanitizer_sigaction * oldact)1377 static int sigaction_impl(int signo, const __sanitizer_sigaction *act,
1378 __sanitizer_sigaction *oldact) {
1379 ENSURE_MSAN_INITED();
1380 if (signo <= 0 || signo >= kMaxSignals) {
1381 errno = errno_EINVAL;
1382 return -1;
1383 }
1384 if (act) read_sigaction(act);
1385 int res;
1386 if (flags()->wrap_signals) {
1387 SpinMutexLock lock(&sigactions_mu);
1388 uptr old_cb = atomic_load(&sigactions[signo], memory_order_relaxed);
1389 __sanitizer_sigaction new_act;
1390 __sanitizer_sigaction *pnew_act = act ? &new_act : nullptr;
1391 if (act) {
1392 REAL(memcpy)(pnew_act, act, sizeof(__sanitizer_sigaction));
1393 uptr cb = (uptr)pnew_act->sigaction;
1394 uptr new_cb = (pnew_act->sa_flags & __sanitizer::sa_siginfo)
1395 ? (uptr)SignalAction
1396 : (uptr)SignalHandler;
1397 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
1398 atomic_store(&sigactions[signo], cb, memory_order_relaxed);
1399 pnew_act->sigaction = (decltype(pnew_act->sigaction))new_cb;
1400 }
1401 }
1402 res = REAL(SIGACTION_SYMNAME)(signo, pnew_act, oldact);
1403 if (res == 0 && oldact) {
1404 uptr cb = (uptr)oldact->sigaction;
1405 if (cb == (uptr)SignalAction || cb == (uptr)SignalHandler) {
1406 oldact->sigaction = (decltype(oldact->sigaction))old_cb;
1407 }
1408 }
1409 } else {
1410 res = REAL(SIGACTION_SYMNAME)(signo, act, oldact);
1411 }
1412
1413 if (res == 0 && oldact) {
1414 __msan_unpoison(oldact, sizeof(__sanitizer_sigaction));
1415 }
1416 return res;
1417 }
1418
signal_impl(int signo,uptr cb)1419 static uptr signal_impl(int signo, uptr cb) {
1420 ENSURE_MSAN_INITED();
1421 if (signo <= 0 || signo >= kMaxSignals) {
1422 errno = errno_EINVAL;
1423 return -1;
1424 }
1425 if (flags()->wrap_signals) {
1426 SpinMutexLock lock(&sigactions_mu);
1427 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
1428 atomic_store(&sigactions[signo], cb, memory_order_relaxed);
1429 cb = (uptr)&SignalHandler;
1430 }
1431 }
1432 return cb;
1433 }
1434
1435 #define COMMON_SYSCALL_PRE_READ_RANGE(p, s) CHECK_UNPOISONED(p, s)
1436 #define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
1437 do { \
1438 } while (false)
1439 #define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
1440 do { \
1441 } while (false)
1442 #define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) __msan_unpoison(p, s)
1443 #include "sanitizer_common/sanitizer_common_syscalls.inc"
1444 #include "sanitizer_common/sanitizer_syscalls_netbsd.inc"
1445
1446 struct dlinfo {
1447 char *dli_fname;
1448 void *dli_fbase;
1449 char *dli_sname;
1450 void *dli_saddr;
1451 };
1452
INTERCEPTOR(int,dladdr,void * addr,dlinfo * info)1453 INTERCEPTOR(int, dladdr, void *addr, dlinfo *info) {
1454 void *ctx;
1455 COMMON_INTERCEPTOR_ENTER(ctx, dladdr, addr, info);
1456 int res = REAL(dladdr)(addr, info);
1457 if (res != 0) {
1458 __msan_unpoison(info, sizeof(*info));
1459 if (info->dli_fname)
1460 __msan_unpoison(info->dli_fname, internal_strlen(info->dli_fname) + 1);
1461 if (info->dli_sname)
1462 __msan_unpoison(info->dli_sname, internal_strlen(info->dli_sname) + 1);
1463 }
1464 return res;
1465 }
1466
INTERCEPTOR(char *,dlerror,int fake)1467 INTERCEPTOR(char *, dlerror, int fake) {
1468 void *ctx;
1469 COMMON_INTERCEPTOR_ENTER(ctx, dlerror, fake);
1470 char *res = REAL(dlerror)(fake);
1471 if (res)
1472 __msan_unpoison(res, internal_strlen(res) + 1);
1473 return res;
1474 }
1475
1476 typedef int (*dl_iterate_phdr_cb)(__sanitizer_dl_phdr_info *info, SIZE_T size,
1477 void *data);
1478 struct dl_iterate_phdr_data {
1479 dl_iterate_phdr_cb callback;
1480 void *data;
1481 };
1482
msan_dl_iterate_phdr_cb(__sanitizer_dl_phdr_info * info,SIZE_T size,void * data)1483 static int msan_dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size,
1484 void *data) {
1485 if (info) {
1486 __msan_unpoison(info, size);
1487 if (info->dlpi_phdr && info->dlpi_phnum)
1488 __msan_unpoison(info->dlpi_phdr, struct_ElfW_Phdr_sz * info->dlpi_phnum);
1489 if (info->dlpi_name)
1490 __msan_unpoison(info->dlpi_name, internal_strlen(info->dlpi_name) + 1);
1491 }
1492 dl_iterate_phdr_data *cbdata = (dl_iterate_phdr_data *)data;
1493 UnpoisonParam(3);
1494 return cbdata->callback(info, size, cbdata->data);
1495 }
1496
INTERCEPTOR(void *,shmat,int shmid,const void * shmaddr,int shmflg)1497 INTERCEPTOR(void *, shmat, int shmid, const void *shmaddr, int shmflg) {
1498 ENSURE_MSAN_INITED();
1499 void *p = REAL(shmat)(shmid, shmaddr, shmflg);
1500 if (p != (void *)-1) {
1501 __sanitizer_shmid_ds ds;
1502 int res = REAL(shmctl)(shmid, shmctl_ipc_stat, &ds);
1503 if (!res) {
1504 __msan_unpoison(p, ds.shm_segsz);
1505 }
1506 }
1507 return p;
1508 }
1509
INTERCEPTOR(int,dl_iterate_phdr,dl_iterate_phdr_cb callback,void * data)1510 INTERCEPTOR(int, dl_iterate_phdr, dl_iterate_phdr_cb callback, void *data) {
1511 void *ctx;
1512 COMMON_INTERCEPTOR_ENTER(ctx, dl_iterate_phdr, callback, data);
1513 dl_iterate_phdr_data cbdata;
1514 cbdata.callback = callback;
1515 cbdata.data = data;
1516 int res = REAL(dl_iterate_phdr)(msan_dl_iterate_phdr_cb, (void *)&cbdata);
1517 return res;
1518 }
1519
1520 // wchar_t *wcschr(const wchar_t *wcs, wchar_t wc);
INTERCEPTOR(wchar_t *,wcschr,void * s,wchar_t wc,void * ps)1521 INTERCEPTOR(wchar_t *, wcschr, void *s, wchar_t wc, void *ps) {
1522 ENSURE_MSAN_INITED();
1523 wchar_t *res = REAL(wcschr)(s, wc, ps);
1524 return res;
1525 }
1526
1527 // wchar_t *wcscpy(wchar_t *dest, const wchar_t *src);
INTERCEPTOR(wchar_t *,wcscpy,wchar_t * dest,const wchar_t * src)1528 INTERCEPTOR(wchar_t *, wcscpy, wchar_t *dest, const wchar_t *src) {
1529 ENSURE_MSAN_INITED();
1530 GET_STORE_STACK_TRACE;
1531 wchar_t *res = REAL(wcscpy)(dest, src);
1532 CopyShadowAndOrigin(dest, src, sizeof(wchar_t) * (internal_wcslen(src) + 1),
1533 &stack);
1534 return res;
1535 }
1536
INTERCEPTOR(wchar_t *,wcsncpy,wchar_t * dest,const wchar_t * src,SIZE_T n)1537 INTERCEPTOR(wchar_t *, wcsncpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
1538 ENSURE_MSAN_INITED();
1539 GET_STORE_STACK_TRACE;
1540 SIZE_T copy_size = internal_wcsnlen(src, n);
1541 if (copy_size < n) copy_size++; // trailing \0
1542 wchar_t *res = REAL(wcsncpy)(dest, src, n);
1543 CopyShadowAndOrigin(dest, src, copy_size * sizeof(wchar_t), &stack);
1544 __msan_unpoison(dest + copy_size, (n - copy_size) * sizeof(wchar_t));
1545 return res;
1546 }
1547
1548 // These interface functions reside here so that they can use
1549 // REAL(memset), etc.
__msan_unpoison(const void * a,uptr size)1550 void __msan_unpoison(const void *a, uptr size) {
1551 if (!MEM_IS_APP(a)) return;
1552 SetShadow(a, size, 0);
1553 }
1554
__msan_poison(const void * a,uptr size)1555 void __msan_poison(const void *a, uptr size) {
1556 if (!MEM_IS_APP(a)) return;
1557 SetShadow(a, size, __msan::flags()->poison_heap_with_zeroes ? 0 : -1);
1558 }
1559
__msan_poison_stack(void * a,uptr size)1560 void __msan_poison_stack(void *a, uptr size) {
1561 if (!MEM_IS_APP(a)) return;
1562 SetShadow(a, size, __msan::flags()->poison_stack_with_zeroes ? 0 : -1);
1563 }
1564
__msan_unpoison_param(uptr n)1565 void __msan_unpoison_param(uptr n) { UnpoisonParam(n); }
1566
__msan_clear_and_unpoison(void * a,uptr size)1567 void __msan_clear_and_unpoison(void *a, uptr size) {
1568 REAL(memset)(a, 0, size);
1569 SetShadow(a, size, 0);
1570 }
1571
__msan_memcpy(void * dest,const void * src,SIZE_T n)1572 void *__msan_memcpy(void *dest, const void *src, SIZE_T n) {
1573 if (!msan_inited) return internal_memcpy(dest, src, n);
1574 if (msan_init_is_running || __msan::IsInSymbolizer())
1575 return REAL(memcpy)(dest, src, n);
1576 ENSURE_MSAN_INITED();
1577 GET_STORE_STACK_TRACE;
1578 void *res = REAL(memcpy)(dest, src, n);
1579 CopyShadowAndOrigin(dest, src, n, &stack);
1580 return res;
1581 }
1582
__msan_memset(void * s,int c,SIZE_T n)1583 void *__msan_memset(void *s, int c, SIZE_T n) {
1584 if (!msan_inited) return internal_memset(s, c, n);
1585 if (msan_init_is_running) return REAL(memset)(s, c, n);
1586 ENSURE_MSAN_INITED();
1587 void *res = REAL(memset)(s, c, n);
1588 __msan_unpoison(s, n);
1589 return res;
1590 }
1591
__msan_memmove(void * dest,const void * src,SIZE_T n)1592 void *__msan_memmove(void *dest, const void *src, SIZE_T n) {
1593 if (!msan_inited) return internal_memmove(dest, src, n);
1594 if (msan_init_is_running) return REAL(memmove)(dest, src, n);
1595 ENSURE_MSAN_INITED();
1596 GET_STORE_STACK_TRACE;
1597 void *res = REAL(memmove)(dest, src, n);
1598 MoveShadowAndOrigin(dest, src, n, &stack);
1599 return res;
1600 }
1601
__msan_unpoison_string(const char * s)1602 void __msan_unpoison_string(const char* s) {
1603 if (!MEM_IS_APP(s)) return;
1604 __msan_unpoison(s, internal_strlen(s) + 1);
1605 }
1606
1607 namespace __msan {
1608
InitializeInterceptors()1609 void InitializeInterceptors() {
1610 static int inited = 0;
1611 CHECK_EQ(inited, 0);
1612
1613 new(interceptor_ctx()) InterceptorContext();
1614
1615 InitializeCommonInterceptors();
1616 InitializeSignalInterceptors();
1617
1618 INTERCEPT_FUNCTION(posix_memalign);
1619 MSAN_MAYBE_INTERCEPT_MEMALIGN;
1620 MSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN;
1621 INTERCEPT_FUNCTION(valloc);
1622 MSAN_MAYBE_INTERCEPT_PVALLOC;
1623 INTERCEPT_FUNCTION(malloc);
1624 INTERCEPT_FUNCTION(calloc);
1625 INTERCEPT_FUNCTION(realloc);
1626 INTERCEPT_FUNCTION(reallocarray);
1627 INTERCEPT_FUNCTION(free);
1628 MSAN_MAYBE_INTERCEPT_CFREE;
1629 MSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE;
1630 MSAN_MAYBE_INTERCEPT_MALLINFO;
1631 MSAN_MAYBE_INTERCEPT_MALLOPT;
1632 MSAN_MAYBE_INTERCEPT_MALLOC_STATS;
1633 INTERCEPT_FUNCTION(fread);
1634 MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED;
1635 INTERCEPT_FUNCTION(memccpy);
1636 MSAN_MAYBE_INTERCEPT_MEMPCPY;
1637 INTERCEPT_FUNCTION(bcopy);
1638 INTERCEPT_FUNCTION(wmemset);
1639 INTERCEPT_FUNCTION(wmemcpy);
1640 MSAN_MAYBE_INTERCEPT_WMEMPCPY;
1641 INTERCEPT_FUNCTION(wmemmove);
1642 INTERCEPT_FUNCTION(strcpy);
1643 MSAN_MAYBE_INTERCEPT_STPCPY;
1644 INTERCEPT_FUNCTION(strdup);
1645 MSAN_MAYBE_INTERCEPT___STRDUP;
1646 INTERCEPT_FUNCTION(strncpy);
1647 MSAN_MAYBE_INTERCEPT_GCVT;
1648 INTERCEPT_FUNCTION(strcat);
1649 INTERCEPT_FUNCTION(strncat);
1650 INTERCEPT_STRTO(strtod);
1651 INTERCEPT_STRTO(strtof);
1652 INTERCEPT_STRTO(strtold);
1653 INTERCEPT_STRTO(strtol);
1654 INTERCEPT_STRTO(strtoul);
1655 INTERCEPT_STRTO(strtoll);
1656 INTERCEPT_STRTO(strtoull);
1657 INTERCEPT_STRTO(strtouq);
1658 INTERCEPT_STRTO(wcstod);
1659 INTERCEPT_STRTO(wcstof);
1660 INTERCEPT_STRTO(wcstold);
1661 INTERCEPT_STRTO(wcstol);
1662 INTERCEPT_STRTO(wcstoul);
1663 INTERCEPT_STRTO(wcstoll);
1664 INTERCEPT_STRTO(wcstoull);
1665 #ifdef SANITIZER_NLDBL_VERSION
1666 INTERCEPT_FUNCTION_VER(vswprintf, SANITIZER_NLDBL_VERSION);
1667 INTERCEPT_FUNCTION_VER(swprintf, SANITIZER_NLDBL_VERSION);
1668 #else
1669 INTERCEPT_FUNCTION(vswprintf);
1670 INTERCEPT_FUNCTION(swprintf);
1671 #endif
1672 INTERCEPT_FUNCTION(strftime);
1673 INTERCEPT_FUNCTION(strftime_l);
1674 MSAN_MAYBE_INTERCEPT___STRFTIME_L;
1675 INTERCEPT_FUNCTION(wcsftime);
1676 INTERCEPT_FUNCTION(wcsftime_l);
1677 MSAN_MAYBE_INTERCEPT___WCSFTIME_L;
1678 INTERCEPT_FUNCTION(mbtowc);
1679 INTERCEPT_FUNCTION(mbrtowc);
1680 INTERCEPT_FUNCTION(wcslen);
1681 INTERCEPT_FUNCTION(wcsnlen);
1682 INTERCEPT_FUNCTION(wcschr);
1683 INTERCEPT_FUNCTION(wcscpy);
1684 INTERCEPT_FUNCTION(wcsncpy);
1685 INTERCEPT_FUNCTION(wcscmp);
1686 INTERCEPT_FUNCTION(getenv);
1687 INTERCEPT_FUNCTION(setenv);
1688 INTERCEPT_FUNCTION(putenv);
1689 INTERCEPT_FUNCTION(gettimeofday);
1690 MSAN_MAYBE_INTERCEPT_FCVT;
1691 MSAN_MAYBE_INTERCEPT_FSTAT;
1692 MSAN_MAYBE_INTERCEPT___FXSTAT;
1693 MSAN_INTERCEPT_FSTATAT;
1694 MSAN_MAYBE_INTERCEPT___FXSTAT64;
1695 MSAN_MAYBE_INTERCEPT___FXSTATAT64;
1696 INTERCEPT_FUNCTION(pipe);
1697 INTERCEPT_FUNCTION(pipe2);
1698 INTERCEPT_FUNCTION(socketpair);
1699 MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED;
1700 INTERCEPT_FUNCTION(getrlimit);
1701 MSAN_MAYBE_INTERCEPT___GETRLIMIT;
1702 MSAN_MAYBE_INTERCEPT_GETRLIMIT64;
1703 MSAN_MAYBE_INTERCEPT_PRLIMIT;
1704 MSAN_MAYBE_INTERCEPT_PRLIMIT64;
1705 INTERCEPT_FUNCTION(gethostname);
1706 MSAN_MAYBE_INTERCEPT_EPOLL_WAIT;
1707 MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT;
1708 INTERCEPT_FUNCTION(dladdr);
1709 INTERCEPT_FUNCTION(dlerror);
1710 INTERCEPT_FUNCTION(dl_iterate_phdr);
1711 INTERCEPT_FUNCTION(getrusage);
1712 #if defined(__mips__)
1713 INTERCEPT_FUNCTION_VER(pthread_create, "GLIBC_2.2");
1714 #else
1715 INTERCEPT_FUNCTION(pthread_create);
1716 #endif
1717 INTERCEPT_FUNCTION(pthread_key_create);
1718
1719 #if SANITIZER_NETBSD
1720 INTERCEPT_FUNCTION(__libc_thr_keycreate);
1721 #endif
1722
1723 INTERCEPT_FUNCTION(pthread_join);
1724 INTERCEPT_FUNCTION(tzset);
1725 INTERCEPT_FUNCTION(atexit);
1726 INTERCEPT_FUNCTION(__cxa_atexit);
1727 INTERCEPT_FUNCTION(shmat);
1728 INTERCEPT_FUNCTION(fork);
1729 MSAN_MAYBE_INTERCEPT_OPENPTY;
1730 MSAN_MAYBE_INTERCEPT_FORKPTY;
1731
1732 inited = 1;
1733 }
1734 } // namespace __msan
1735