1 //===-- msan_interceptors.cc ----------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is a part of MemorySanitizer.
12 // Interceptors for standard library functions.
14 // FIXME: move as many interceptors as possible into
15 // sanitizer_common/sanitizer_common_interceptors.h
16 //===----------------------------------------------------------------------===//
18 #include "interception/interception.h"
20 #include "msan_chained_origin_depot.h"
21 #include "msan_origin.h"
22 #include "msan_thread.h"
23 #include "msan_poisoning.h"
24 #include "sanitizer_common/sanitizer_platform_limits_posix.h"
25 #include "sanitizer_common/sanitizer_allocator.h"
26 #include "sanitizer_common/sanitizer_allocator_interface.h"
27 #include "sanitizer_common/sanitizer_allocator_internal.h"
28 #include "sanitizer_common/sanitizer_atomic.h"
29 #include "sanitizer_common/sanitizer_common.h"
30 #include "sanitizer_common/sanitizer_stackdepot.h"
31 #include "sanitizer_common/sanitizer_libc.h"
32 #include "sanitizer_common/sanitizer_linux.h"
33 #include "sanitizer_common/sanitizer_tls_get_addr.h"
36 // ACHTUNG! No other system header includes in this file.
37 // Ideally, we should get rid of stdarg.h as well.
39 using namespace __msan;
41 using __sanitizer::memory_order;
42 using __sanitizer::atomic_load;
43 using __sanitizer::atomic_store;
44 using __sanitizer::atomic_uintptr_t;
46 DECLARE_REAL(SIZE_T, strlen, const char *s)
47 DECLARE_REAL(SIZE_T, strnlen, const char *s, SIZE_T maxlen)
48 DECLARE_REAL(void *, memcpy, void *dest, const void *src, uptr n)
49 DECLARE_REAL(void *, memset, void *dest, int c, uptr n)
52 #define __errno_location __error
55 // True if this is a nested interceptor.
56 static THREADLOCAL int in_interceptor_scope;
58 extern "C" int *__errno_location(void);
60 struct InterceptorScope {
61 InterceptorScope() { ++in_interceptor_scope; }
62 ~InterceptorScope() { --in_interceptor_scope; }
65 bool IsInInterceptorScope() {
66 return in_interceptor_scope;
69 static uptr allocated_for_dlsym;
70 static const uptr kDlsymAllocPoolSize = 1024;
71 static uptr alloc_memory_for_dlsym[kDlsymAllocPoolSize];
73 static bool IsInDlsymAllocPool(const void *ptr) {
74 uptr off = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
75 return off < sizeof(alloc_memory_for_dlsym);
78 static void *AllocateFromLocalPool(uptr size_in_bytes) {
79 uptr size_in_words = RoundUpTo(size_in_bytes, kWordSize) / kWordSize;
80 void *mem = (void *)&alloc_memory_for_dlsym[allocated_for_dlsym];
81 allocated_for_dlsym += size_in_words;
82 CHECK_LT(allocated_for_dlsym, kDlsymAllocPoolSize);
86 #define ENSURE_MSAN_INITED() do { \
87 CHECK(!msan_init_is_running); \
93 // Check that [x, x+n) range is unpoisoned.
94 #define CHECK_UNPOISONED_0(x, n) \
96 sptr offset = __msan_test_shadow(x, n); \
97 if (__msan::IsInSymbolizer()) \
99 if (offset >= 0 && __msan::flags()->report_umrs) { \
100 GET_CALLER_PC_BP_SP; \
102 ReportUMRInsideAddressRange(__func__, x, n, offset); \
103 __msan::PrintWarningWithOrigin( \
104 pc, bp, __msan_get_origin((const char *)x + offset)); \
105 if (__msan::flags()->halt_on_error) { \
106 Printf("Exiting\n"); \
112 // Check that [x, x+n) range is unpoisoned unless we are in a nested
114 #define CHECK_UNPOISONED(x, n) \
116 if (!IsInInterceptorScope()) CHECK_UNPOISONED_0(x, n); \
119 #define CHECK_UNPOISONED_STRING_OF_LEN(x, len, n) \
120 CHECK_UNPOISONED((x), \
121 common_flags()->strict_string_checks ? (len) + 1 : (n) )
123 #define CHECK_UNPOISONED_STRING(x, n) \
124 CHECK_UNPOISONED_STRING_OF_LEN((x), internal_strlen(x), (n))
126 INTERCEPTOR(SIZE_T, fread, void *ptr, SIZE_T size, SIZE_T nmemb, void *file) {
127 ENSURE_MSAN_INITED();
128 SIZE_T res = REAL(fread)(ptr, size, nmemb, file);
130 __msan_unpoison(ptr, res *size);
134 #if !SANITIZER_FREEBSD
135 INTERCEPTOR(SIZE_T, fread_unlocked, void *ptr, SIZE_T size, SIZE_T nmemb,
137 ENSURE_MSAN_INITED();
138 SIZE_T res = REAL(fread_unlocked)(ptr, size, nmemb, file);
140 __msan_unpoison(ptr, res *size);
143 #define MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED INTERCEPT_FUNCTION(fread_unlocked)
145 #define MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED
148 INTERCEPTOR(SSIZE_T, readlink, const char *path, char *buf, SIZE_T bufsiz) {
149 ENSURE_MSAN_INITED();
150 CHECK_UNPOISONED_STRING(path, 0)
151 SSIZE_T res = REAL(readlink)(path, buf, bufsiz);
153 __msan_unpoison(buf, res);
157 INTERCEPTOR(void *, mempcpy, void *dest, const void *src, SIZE_T n) {
158 return (char *)__msan_memcpy(dest, src, n) + n;
161 INTERCEPTOR(void *, memccpy, void *dest, const void *src, int c, SIZE_T n) {
162 ENSURE_MSAN_INITED();
163 void *res = REAL(memccpy)(dest, src, c, n);
164 CHECK(!res || (res >= dest && res <= (char *)dest + n));
165 SIZE_T sz = res ? (char *)res - (char *)dest : n;
166 CHECK_UNPOISONED(src, sz);
167 __msan_unpoison(dest, sz);
171 INTERCEPTOR(void *, bcopy, const void *src, void *dest, SIZE_T n) {
172 return __msan_memmove(dest, src, n);
175 INTERCEPTOR(int, posix_memalign, void **memptr, SIZE_T alignment, SIZE_T size) {
176 GET_MALLOC_STACK_TRACE;
177 CHECK_EQ(alignment & (alignment - 1), 0);
179 *memptr = MsanReallocate(&stack, nullptr, size, alignment, false);
180 CHECK_NE(*memptr, 0);
181 __msan_unpoison(memptr, sizeof(*memptr));
185 #if !SANITIZER_FREEBSD
186 INTERCEPTOR(void *, memalign, SIZE_T boundary, SIZE_T size) {
187 GET_MALLOC_STACK_TRACE;
188 CHECK_EQ(boundary & (boundary - 1), 0);
189 void *ptr = MsanReallocate(&stack, nullptr, size, boundary, false);
192 #define MSAN_MAYBE_INTERCEPT_MEMALIGN INTERCEPT_FUNCTION(memalign)
194 #define MSAN_MAYBE_INTERCEPT_MEMALIGN
197 INTERCEPTOR(void *, aligned_alloc, SIZE_T boundary, SIZE_T size) {
198 GET_MALLOC_STACK_TRACE;
199 CHECK_EQ(boundary & (boundary - 1), 0);
200 void *ptr = MsanReallocate(&stack, nullptr, size, boundary, false);
204 INTERCEPTOR(void *, __libc_memalign, SIZE_T boundary, SIZE_T size) {
205 GET_MALLOC_STACK_TRACE;
206 CHECK_EQ(boundary & (boundary - 1), 0);
207 void *ptr = MsanReallocate(&stack, nullptr, size, boundary, false);
208 DTLS_on_libc_memalign(ptr, size);
212 INTERCEPTOR(void *, valloc, SIZE_T size) {
213 GET_MALLOC_STACK_TRACE;
214 void *ptr = MsanReallocate(&stack, nullptr, size, GetPageSizeCached(), false);
218 #if !SANITIZER_FREEBSD
219 INTERCEPTOR(void *, pvalloc, SIZE_T size) {
220 GET_MALLOC_STACK_TRACE;
221 uptr PageSize = GetPageSizeCached();
222 size = RoundUpTo(size, PageSize);
224 // pvalloc(0) should allocate one page.
227 void *ptr = MsanReallocate(&stack, nullptr, size, PageSize, false);
230 #define MSAN_MAYBE_INTERCEPT_PVALLOC INTERCEPT_FUNCTION(pvalloc)
232 #define MSAN_MAYBE_INTERCEPT_PVALLOC
235 INTERCEPTOR(void, free, void *ptr) {
236 GET_MALLOC_STACK_TRACE;
237 if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
238 MsanDeallocate(&stack, ptr);
241 #if !SANITIZER_FREEBSD
242 INTERCEPTOR(void, cfree, void *ptr) {
243 GET_MALLOC_STACK_TRACE;
244 if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
245 MsanDeallocate(&stack, ptr);
247 #define MSAN_MAYBE_INTERCEPT_CFREE INTERCEPT_FUNCTION(cfree)
249 #define MSAN_MAYBE_INTERCEPT_CFREE
252 INTERCEPTOR(uptr, malloc_usable_size, void *ptr) {
253 return __sanitizer_get_allocated_size(ptr);
256 #if !SANITIZER_FREEBSD
257 // This function actually returns a struct by value, but we can't unpoison a
258 // temporary! The following is equivalent on all supported platforms but
259 // aarch64 (which uses a different register for sret value). We have a test
261 INTERCEPTOR(void, mallinfo, __sanitizer_mallinfo *sret) {
264 asm volatile("mov %0,x8" : "=r" (r8));
265 sret = reinterpret_cast<__sanitizer_mallinfo*>(r8);
267 REAL(memset)(sret, 0, sizeof(*sret));
268 __msan_unpoison(sret, sizeof(*sret));
270 #define MSAN_MAYBE_INTERCEPT_MALLINFO INTERCEPT_FUNCTION(mallinfo)
272 #define MSAN_MAYBE_INTERCEPT_MALLINFO
275 #if !SANITIZER_FREEBSD
276 INTERCEPTOR(int, mallopt, int cmd, int value) {
279 #define MSAN_MAYBE_INTERCEPT_MALLOPT INTERCEPT_FUNCTION(mallopt)
281 #define MSAN_MAYBE_INTERCEPT_MALLOPT
284 #if !SANITIZER_FREEBSD
285 INTERCEPTOR(void, malloc_stats, void) {
286 // FIXME: implement, but don't call REAL(malloc_stats)!
288 #define MSAN_MAYBE_INTERCEPT_MALLOC_STATS INTERCEPT_FUNCTION(malloc_stats)
290 #define MSAN_MAYBE_INTERCEPT_MALLOC_STATS
293 INTERCEPTOR(char *, strcpy, char *dest, const char *src) { // NOLINT
294 ENSURE_MSAN_INITED();
295 GET_STORE_STACK_TRACE;
296 SIZE_T n = REAL(strlen)(src);
297 CHECK_UNPOISONED_STRING(src + n, 0);
298 char *res = REAL(strcpy)(dest, src); // NOLINT
299 CopyShadowAndOrigin(dest, src, n + 1, &stack);
303 INTERCEPTOR(char *, strncpy, char *dest, const char *src, SIZE_T n) { // NOLINT
304 ENSURE_MSAN_INITED();
305 GET_STORE_STACK_TRACE;
306 SIZE_T copy_size = REAL(strnlen)(src, n);
308 copy_size++; // trailing \0
309 char *res = REAL(strncpy)(dest, src, n); // NOLINT
310 CopyShadowAndOrigin(dest, src, copy_size, &stack);
311 __msan_unpoison(dest + copy_size, n - copy_size);
315 INTERCEPTOR(char *, stpcpy, char *dest, const char *src) { // NOLINT
316 ENSURE_MSAN_INITED();
317 GET_STORE_STACK_TRACE;
318 SIZE_T n = REAL(strlen)(src);
319 CHECK_UNPOISONED_STRING(src + n, 0);
320 char *res = REAL(stpcpy)(dest, src); // NOLINT
321 CopyShadowAndOrigin(dest, src, n + 1, &stack);
325 INTERCEPTOR(char *, strdup, char *src) {
326 ENSURE_MSAN_INITED();
327 GET_STORE_STACK_TRACE;
328 // On FreeBSD strdup() leverages strlen().
329 InterceptorScope interceptor_scope;
330 SIZE_T n = REAL(strlen)(src);
331 CHECK_UNPOISONED_STRING(src + n, 0);
332 char *res = REAL(strdup)(src);
333 CopyShadowAndOrigin(res, src, n + 1, &stack);
337 #if !SANITIZER_FREEBSD
338 INTERCEPTOR(char *, __strdup, char *src) {
339 ENSURE_MSAN_INITED();
340 GET_STORE_STACK_TRACE;
341 SIZE_T n = REAL(strlen)(src);
342 CHECK_UNPOISONED_STRING(src + n, 0);
343 char *res = REAL(__strdup)(src);
344 CopyShadowAndOrigin(res, src, n + 1, &stack);
347 #define MSAN_MAYBE_INTERCEPT___STRDUP INTERCEPT_FUNCTION(__strdup)
349 #define MSAN_MAYBE_INTERCEPT___STRDUP
352 INTERCEPTOR(char *, strndup, char *src, SIZE_T n) {
353 ENSURE_MSAN_INITED();
354 GET_STORE_STACK_TRACE;
355 // On FreeBSD strndup() leverages strnlen().
356 InterceptorScope interceptor_scope;
357 SIZE_T copy_size = REAL(strnlen)(src, n);
358 char *res = REAL(strndup)(src, n);
359 CopyShadowAndOrigin(res, src, copy_size, &stack);
360 __msan_unpoison(res + copy_size, 1); // \0
364 #if !SANITIZER_FREEBSD
365 INTERCEPTOR(char *, __strndup, char *src, SIZE_T n) {
366 ENSURE_MSAN_INITED();
367 GET_STORE_STACK_TRACE;
368 SIZE_T copy_size = REAL(strnlen)(src, n);
369 char *res = REAL(__strndup)(src, n);
370 CopyShadowAndOrigin(res, src, copy_size, &stack);
371 __msan_unpoison(res + copy_size, 1); // \0
374 #define MSAN_MAYBE_INTERCEPT___STRNDUP INTERCEPT_FUNCTION(__strndup)
376 #define MSAN_MAYBE_INTERCEPT___STRNDUP
379 INTERCEPTOR(char *, gcvt, double number, SIZE_T ndigit, char *buf) {
380 ENSURE_MSAN_INITED();
381 char *res = REAL(gcvt)(number, ndigit, buf);
382 SIZE_T n = REAL(strlen)(buf);
383 __msan_unpoison(buf, n + 1);
387 INTERCEPTOR(char *, strcat, char *dest, const char *src) { // NOLINT
388 ENSURE_MSAN_INITED();
389 GET_STORE_STACK_TRACE;
390 SIZE_T src_size = REAL(strlen)(src);
391 SIZE_T dest_size = REAL(strlen)(dest);
392 CHECK_UNPOISONED_STRING(src + src_size, 0);
393 CHECK_UNPOISONED_STRING(dest + dest_size, 0);
394 char *res = REAL(strcat)(dest, src); // NOLINT
395 CopyShadowAndOrigin(dest + dest_size, src, src_size + 1, &stack);
399 INTERCEPTOR(char *, strncat, char *dest, const char *src, SIZE_T n) { // NOLINT
400 ENSURE_MSAN_INITED();
401 GET_STORE_STACK_TRACE;
402 SIZE_T dest_size = REAL(strlen)(dest);
403 SIZE_T copy_size = REAL(strnlen)(src, n);
404 CHECK_UNPOISONED_STRING(dest + dest_size, 0);
405 char *res = REAL(strncat)(dest, src, n); // NOLINT
406 CopyShadowAndOrigin(dest + dest_size, src, copy_size, &stack);
407 __msan_unpoison(dest + dest_size + copy_size, 1); // \0
411 // Hack: always pass nptr and endptr as part of __VA_ARGS_ to avoid having to
412 // deal with empty __VA_ARGS__ in the case of INTERCEPTOR_STRTO.
413 #define INTERCEPTOR_STRTO_BODY(ret_type, func, ...) \
414 ENSURE_MSAN_INITED(); \
415 ret_type res = REAL(func)(__VA_ARGS__); \
416 __msan_unpoison(endptr, sizeof(*endptr)); \
419 #define INTERCEPTOR_STRTO(ret_type, func, char_type) \
420 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr) { \
421 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr); \
424 #define INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
425 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
427 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base); \
430 #define INTERCEPTOR_STRTO_LOC(ret_type, func, char_type) \
431 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
433 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, loc); \
436 #define INTERCEPTOR_STRTO_BASE_LOC(ret_type, func, char_type) \
437 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
438 int base, void *loc) { \
439 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base, loc); \
442 #define INTERCEPTORS_STRTO(ret_type, func, char_type) \
443 INTERCEPTOR_STRTO(ret_type, func, char_type) \
444 INTERCEPTOR_STRTO_LOC(ret_type, func##_l, char_type) \
445 INTERCEPTOR_STRTO_LOC(ret_type, __##func##_l, char_type) \
446 INTERCEPTOR_STRTO_LOC(ret_type, __##func##_internal, char_type)
448 #define INTERCEPTORS_STRTO_BASE(ret_type, func, char_type) \
449 INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
450 INTERCEPTOR_STRTO_BASE_LOC(ret_type, func##_l, char_type) \
451 INTERCEPTOR_STRTO_BASE_LOC(ret_type, __##func##_l, char_type) \
452 INTERCEPTOR_STRTO_BASE_LOC(ret_type, __##func##_internal, char_type)
454 INTERCEPTORS_STRTO(double, strtod, char) // NOLINT
455 INTERCEPTORS_STRTO(float, strtof, char) // NOLINT
456 INTERCEPTORS_STRTO(long double, strtold, char) // NOLINT
457 INTERCEPTORS_STRTO_BASE(long, strtol, char) // NOLINT
458 INTERCEPTORS_STRTO_BASE(long long, strtoll, char) // NOLINT
459 INTERCEPTORS_STRTO_BASE(unsigned long, strtoul, char) // NOLINT
460 INTERCEPTORS_STRTO_BASE(unsigned long long, strtoull, char) // NOLINT
462 INTERCEPTORS_STRTO(double, wcstod, wchar_t) // NOLINT
463 INTERCEPTORS_STRTO(float, wcstof, wchar_t) // NOLINT
464 INTERCEPTORS_STRTO(long double, wcstold, wchar_t) // NOLINT
465 INTERCEPTORS_STRTO_BASE(long, wcstol, wchar_t) // NOLINT
466 INTERCEPTORS_STRTO_BASE(long long, wcstoll, wchar_t) // NOLINT
467 INTERCEPTORS_STRTO_BASE(unsigned long, wcstoul, wchar_t) // NOLINT
468 INTERCEPTORS_STRTO_BASE(unsigned long long, wcstoull, wchar_t) // NOLINT
470 #define INTERCEPT_STRTO(func) \
471 INTERCEPT_FUNCTION(func); \
472 INTERCEPT_FUNCTION(func##_l); \
473 INTERCEPT_FUNCTION(__##func##_l); \
474 INTERCEPT_FUNCTION(__##func##_internal);
477 // FIXME: support *wprintf in common format interceptors.
478 INTERCEPTOR(int, vswprintf, void *str, uptr size, void *format, va_list ap) {
479 ENSURE_MSAN_INITED();
480 int res = REAL(vswprintf)(str, size, format, ap);
482 __msan_unpoison(str, 4 * (res + 1));
487 INTERCEPTOR(int, swprintf, void *str, uptr size, void *format, ...) {
488 ENSURE_MSAN_INITED();
490 va_start(ap, format);
491 int res = vswprintf(str, size, format, ap);
496 INTERCEPTOR(SIZE_T, strxfrm, char *dest, const char *src, SIZE_T n) {
497 ENSURE_MSAN_INITED();
498 CHECK_UNPOISONED(src, REAL(strlen)(src) + 1);
499 SIZE_T res = REAL(strxfrm)(dest, src, n);
500 if (res < n) __msan_unpoison(dest, res + 1);
504 INTERCEPTOR(SIZE_T, strxfrm_l, char *dest, const char *src, SIZE_T n,
506 ENSURE_MSAN_INITED();
507 CHECK_UNPOISONED(src, REAL(strlen)(src) + 1);
508 SIZE_T res = REAL(strxfrm_l)(dest, src, n, loc);
509 if (res < n) __msan_unpoison(dest, res + 1);
513 #define INTERCEPTOR_STRFTIME_BODY(char_type, ret_type, func, s, ...) \
514 ENSURE_MSAN_INITED(); \
515 ret_type res = REAL(func)(s, __VA_ARGS__); \
516 if (s) __msan_unpoison(s, sizeof(char_type) * (res + 1)); \
519 INTERCEPTOR(SIZE_T, strftime, char *s, SIZE_T max, const char *format,
520 __sanitizer_tm *tm) {
521 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, strftime, s, max, format, tm);
524 INTERCEPTOR(SIZE_T, strftime_l, char *s, SIZE_T max, const char *format,
525 __sanitizer_tm *tm, void *loc) {
526 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, strftime_l, s, max, format, tm, loc);
529 #if !SANITIZER_FREEBSD
530 INTERCEPTOR(SIZE_T, __strftime_l, char *s, SIZE_T max, const char *format,
531 __sanitizer_tm *tm, void *loc) {
532 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, __strftime_l, s, max, format, tm,
535 #define MSAN_MAYBE_INTERCEPT___STRFTIME_L INTERCEPT_FUNCTION(__strftime_l)
537 #define MSAN_MAYBE_INTERCEPT___STRFTIME_L
540 INTERCEPTOR(SIZE_T, wcsftime, wchar_t *s, SIZE_T max, const wchar_t *format,
541 __sanitizer_tm *tm) {
542 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, wcsftime, s, max, format, tm);
545 INTERCEPTOR(SIZE_T, wcsftime_l, wchar_t *s, SIZE_T max, const wchar_t *format,
546 __sanitizer_tm *tm, void *loc) {
547 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, wcsftime_l, s, max, format, tm,
551 #if !SANITIZER_FREEBSD
552 INTERCEPTOR(SIZE_T, __wcsftime_l, wchar_t *s, SIZE_T max, const wchar_t *format,
553 __sanitizer_tm *tm, void *loc) {
554 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, __wcsftime_l, s, max, format, tm,
557 #define MSAN_MAYBE_INTERCEPT___WCSFTIME_L INTERCEPT_FUNCTION(__wcsftime_l)
559 #define MSAN_MAYBE_INTERCEPT___WCSFTIME_L
562 INTERCEPTOR(int, mbtowc, wchar_t *dest, const char *src, SIZE_T n) {
563 ENSURE_MSAN_INITED();
564 int res = REAL(mbtowc)(dest, src, n);
565 if (res != -1 && dest) __msan_unpoison(dest, sizeof(wchar_t));
569 INTERCEPTOR(int, mbrtowc, wchar_t *dest, const char *src, SIZE_T n, void *ps) {
570 ENSURE_MSAN_INITED();
571 SIZE_T res = REAL(mbrtowc)(dest, src, n, ps);
572 if (res != (SIZE_T)-1 && dest) __msan_unpoison(dest, sizeof(wchar_t));
576 INTERCEPTOR(SIZE_T, wcslen, const wchar_t *s) {
577 ENSURE_MSAN_INITED();
578 SIZE_T res = REAL(wcslen)(s);
579 CHECK_UNPOISONED(s, sizeof(wchar_t) * (res + 1));
583 // wchar_t *wcschr(const wchar_t *wcs, wchar_t wc);
584 INTERCEPTOR(wchar_t *, wcschr, void *s, wchar_t wc, void *ps) {
585 ENSURE_MSAN_INITED();
586 wchar_t *res = REAL(wcschr)(s, wc, ps);
590 // wchar_t *wcscpy(wchar_t *dest, const wchar_t *src);
591 INTERCEPTOR(wchar_t *, wcscpy, wchar_t *dest, const wchar_t *src) {
592 ENSURE_MSAN_INITED();
593 GET_STORE_STACK_TRACE;
594 wchar_t *res = REAL(wcscpy)(dest, src);
595 CopyShadowAndOrigin(dest, src, sizeof(wchar_t) * (REAL(wcslen)(src) + 1),
600 // wchar_t *wmemcpy(wchar_t *dest, const wchar_t *src, SIZE_T n);
601 INTERCEPTOR(wchar_t *, wmemcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
602 ENSURE_MSAN_INITED();
603 GET_STORE_STACK_TRACE;
604 wchar_t *res = REAL(wmemcpy)(dest, src, n);
605 CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
609 INTERCEPTOR(wchar_t *, wmempcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
610 ENSURE_MSAN_INITED();
611 GET_STORE_STACK_TRACE;
612 wchar_t *res = REAL(wmempcpy)(dest, src, n);
613 CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
617 INTERCEPTOR(wchar_t *, wmemset, wchar_t *s, wchar_t c, SIZE_T n) {
618 CHECK(MEM_IS_APP(s));
619 ENSURE_MSAN_INITED();
620 wchar_t *res = REAL(wmemset)(s, c, n);
621 __msan_unpoison(s, n * sizeof(wchar_t));
625 INTERCEPTOR(wchar_t *, wmemmove, wchar_t *dest, const wchar_t *src, SIZE_T n) {
626 ENSURE_MSAN_INITED();
627 GET_STORE_STACK_TRACE;
628 wchar_t *res = REAL(wmemmove)(dest, src, n);
629 MoveShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
633 INTERCEPTOR(int, wcscmp, const wchar_t *s1, const wchar_t *s2) {
634 ENSURE_MSAN_INITED();
635 int res = REAL(wcscmp)(s1, s2);
639 INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
640 ENSURE_MSAN_INITED();
641 int res = REAL(gettimeofday)(tv, tz);
643 __msan_unpoison(tv, 16);
645 __msan_unpoison(tz, 8);
649 INTERCEPTOR(char *, fcvt, double x, int a, int *b, int *c) {
650 ENSURE_MSAN_INITED();
651 char *res = REAL(fcvt)(x, a, b, c);
652 __msan_unpoison(b, sizeof(*b));
653 __msan_unpoison(c, sizeof(*c));
654 if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
658 INTERCEPTOR(char *, getenv, char *name) {
659 if (msan_init_is_running)
660 return REAL(getenv)(name);
661 ENSURE_MSAN_INITED();
662 char *res = REAL(getenv)(name);
663 if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
667 extern char **environ;
669 static void UnpoisonEnviron() {
670 char **envp = environ;
671 for (; *envp; ++envp) {
672 __msan_unpoison(envp, sizeof(*envp));
673 __msan_unpoison(*envp, REAL(strlen)(*envp) + 1);
675 // Trailing NULL pointer.
676 __msan_unpoison(envp, sizeof(*envp));
679 INTERCEPTOR(int, setenv, const char *name, const char *value, int overwrite) {
680 ENSURE_MSAN_INITED();
681 CHECK_UNPOISONED_STRING(name, 0)
682 int res = REAL(setenv)(name, value, overwrite);
683 if (!res) UnpoisonEnviron();
687 INTERCEPTOR(int, putenv, char *string) {
688 ENSURE_MSAN_INITED();
689 int res = REAL(putenv)(string);
690 if (!res) UnpoisonEnviron();
694 #if !SANITIZER_FREEBSD
695 INTERCEPTOR(int, __fxstat, int magic, int fd, void *buf) {
696 ENSURE_MSAN_INITED();
697 int res = REAL(__fxstat)(magic, fd, buf);
699 __msan_unpoison(buf, __sanitizer::struct_stat_sz);
702 #define MSAN_MAYBE_INTERCEPT___FXSTAT INTERCEPT_FUNCTION(__fxstat)
704 #define MSAN_MAYBE_INTERCEPT___FXSTAT
707 #if !SANITIZER_FREEBSD
708 INTERCEPTOR(int, __fxstat64, int magic, int fd, void *buf) {
709 ENSURE_MSAN_INITED();
710 int res = REAL(__fxstat64)(magic, fd, buf);
712 __msan_unpoison(buf, __sanitizer::struct_stat64_sz);
715 #define MSAN_MAYBE_INTERCEPT___FXSTAT64 INTERCEPT_FUNCTION(__fxstat64)
717 #define MSAN_MAYBE_INTERCEPT___FXSTAT64
720 #if SANITIZER_FREEBSD
721 INTERCEPTOR(int, fstatat, int fd, char *pathname, void *buf, int flags) {
722 ENSURE_MSAN_INITED();
723 int res = REAL(fstatat)(fd, pathname, buf, flags);
724 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz);
727 # define MSAN_INTERCEPT_FSTATAT INTERCEPT_FUNCTION(fstatat)
729 INTERCEPTOR(int, __fxstatat, int magic, int fd, char *pathname, void *buf,
731 ENSURE_MSAN_INITED();
732 int res = REAL(__fxstatat)(magic, fd, pathname, buf, flags);
733 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz);
736 # define MSAN_INTERCEPT_FSTATAT INTERCEPT_FUNCTION(__fxstatat)
739 #if !SANITIZER_FREEBSD
740 INTERCEPTOR(int, __fxstatat64, int magic, int fd, char *pathname, void *buf,
742 ENSURE_MSAN_INITED();
743 int res = REAL(__fxstatat64)(magic, fd, pathname, buf, flags);
744 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat64_sz);
747 #define MSAN_MAYBE_INTERCEPT___FXSTATAT64 INTERCEPT_FUNCTION(__fxstatat64)
749 #define MSAN_MAYBE_INTERCEPT___FXSTATAT64
752 INTERCEPTOR(int, pipe, int pipefd[2]) {
753 if (msan_init_is_running)
754 return REAL(pipe)(pipefd);
755 ENSURE_MSAN_INITED();
756 int res = REAL(pipe)(pipefd);
758 __msan_unpoison(pipefd, sizeof(int[2]));
762 INTERCEPTOR(int, pipe2, int pipefd[2], int flags) {
763 ENSURE_MSAN_INITED();
764 int res = REAL(pipe2)(pipefd, flags);
766 __msan_unpoison(pipefd, sizeof(int[2]));
770 INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int sv[2]) {
771 ENSURE_MSAN_INITED();
772 int res = REAL(socketpair)(domain, type, protocol, sv);
774 __msan_unpoison(sv, sizeof(int[2]));
778 INTERCEPTOR(char *, fgets, char *s, int size, void *stream) {
779 ENSURE_MSAN_INITED();
780 char *res = REAL(fgets)(s, size, stream);
782 __msan_unpoison(s, REAL(strlen)(s) + 1);
786 #if !SANITIZER_FREEBSD
787 INTERCEPTOR(char *, fgets_unlocked, char *s, int size, void *stream) {
788 ENSURE_MSAN_INITED();
789 char *res = REAL(fgets_unlocked)(s, size, stream);
791 __msan_unpoison(s, REAL(strlen)(s) + 1);
794 #define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED INTERCEPT_FUNCTION(fgets_unlocked)
796 #define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED
799 INTERCEPTOR(int, getrlimit, int resource, void *rlim) {
800 if (msan_init_is_running)
801 return REAL(getrlimit)(resource, rlim);
802 ENSURE_MSAN_INITED();
803 int res = REAL(getrlimit)(resource, rlim);
805 __msan_unpoison(rlim, __sanitizer::struct_rlimit_sz);
809 #if !SANITIZER_FREEBSD
810 INTERCEPTOR(int, getrlimit64, int resource, void *rlim) {
811 if (msan_init_is_running) return REAL(getrlimit64)(resource, rlim);
812 ENSURE_MSAN_INITED();
813 int res = REAL(getrlimit64)(resource, rlim);
814 if (!res) __msan_unpoison(rlim, __sanitizer::struct_rlimit64_sz);
818 INTERCEPTOR(int, prlimit, int pid, int resource, void *new_rlimit,
820 if (msan_init_is_running)
821 return REAL(prlimit)(pid, resource, new_rlimit, old_rlimit);
822 ENSURE_MSAN_INITED();
823 CHECK_UNPOISONED(new_rlimit, __sanitizer::struct_rlimit_sz);
824 int res = REAL(prlimit)(pid, resource, new_rlimit, old_rlimit);
825 if (!res) __msan_unpoison(old_rlimit, __sanitizer::struct_rlimit_sz);
829 INTERCEPTOR(int, prlimit64, int pid, int resource, void *new_rlimit,
831 if (msan_init_is_running)
832 return REAL(prlimit64)(pid, resource, new_rlimit, old_rlimit);
833 ENSURE_MSAN_INITED();
834 CHECK_UNPOISONED(new_rlimit, __sanitizer::struct_rlimit64_sz);
835 int res = REAL(prlimit64)(pid, resource, new_rlimit, old_rlimit);
836 if (!res) __msan_unpoison(old_rlimit, __sanitizer::struct_rlimit64_sz);
840 #define MSAN_MAYBE_INTERCEPT_GETRLIMIT64 INTERCEPT_FUNCTION(getrlimit64)
841 #define MSAN_MAYBE_INTERCEPT_PRLIMIT INTERCEPT_FUNCTION(prlimit)
842 #define MSAN_MAYBE_INTERCEPT_PRLIMIT64 INTERCEPT_FUNCTION(prlimit64)
844 #define MSAN_MAYBE_INTERCEPT_GETRLIMIT64
845 #define MSAN_MAYBE_INTERCEPT_PRLIMIT
846 #define MSAN_MAYBE_INTERCEPT_PRLIMIT64
849 #if SANITIZER_FREEBSD
850 // FreeBSD's <sys/utsname.h> define uname() as
851 // static __inline int uname(struct utsname *name) {
852 // return __xuname(SYS_NMLN, (void*)name);
854 INTERCEPTOR(int, __xuname, int size, void *utsname) {
855 ENSURE_MSAN_INITED();
856 int res = REAL(__xuname)(size, utsname);
858 __msan_unpoison(utsname, __sanitizer::struct_utsname_sz);
861 #define MSAN_INTERCEPT_UNAME INTERCEPT_FUNCTION(__xuname)
863 INTERCEPTOR(int, uname, struct utsname *utsname) {
864 ENSURE_MSAN_INITED();
865 int res = REAL(uname)(utsname);
867 __msan_unpoison(utsname, __sanitizer::struct_utsname_sz);
870 #define MSAN_INTERCEPT_UNAME INTERCEPT_FUNCTION(uname)
873 INTERCEPTOR(int, gethostname, char *name, SIZE_T len) {
874 ENSURE_MSAN_INITED();
875 int res = REAL(gethostname)(name, len);
877 SIZE_T real_len = REAL(strnlen)(name, len);
880 __msan_unpoison(name, real_len);
885 #if !SANITIZER_FREEBSD
886 INTERCEPTOR(int, epoll_wait, int epfd, void *events, int maxevents,
888 ENSURE_MSAN_INITED();
889 int res = REAL(epoll_wait)(epfd, events, maxevents, timeout);
891 __msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res);
895 #define MSAN_MAYBE_INTERCEPT_EPOLL_WAIT INTERCEPT_FUNCTION(epoll_wait)
897 #define MSAN_MAYBE_INTERCEPT_EPOLL_WAIT
900 #if !SANITIZER_FREEBSD
901 INTERCEPTOR(int, epoll_pwait, int epfd, void *events, int maxevents,
902 int timeout, void *sigmask) {
903 ENSURE_MSAN_INITED();
904 int res = REAL(epoll_pwait)(epfd, events, maxevents, timeout, sigmask);
906 __msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res);
910 #define MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT INTERCEPT_FUNCTION(epoll_pwait)
912 #define MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT
915 INTERCEPTOR(void *, calloc, SIZE_T nmemb, SIZE_T size) {
916 GET_MALLOC_STACK_TRACE;
917 if (UNLIKELY(!msan_inited))
918 // Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym.
919 return AllocateFromLocalPool(nmemb * size);
920 return MsanCalloc(&stack, nmemb, size);
923 INTERCEPTOR(void *, realloc, void *ptr, SIZE_T size) {
924 GET_MALLOC_STACK_TRACE;
925 if (UNLIKELY(IsInDlsymAllocPool(ptr))) {
926 uptr offset = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
927 uptr copy_size = Min(size, kDlsymAllocPoolSize - offset);
929 if (UNLIKELY(!msan_inited)) {
930 new_ptr = AllocateFromLocalPool(copy_size);
933 new_ptr = MsanReallocate(&stack, nullptr, copy_size, sizeof(u64), false);
935 internal_memcpy(new_ptr, ptr, copy_size);
938 return MsanReallocate(&stack, ptr, size, sizeof(u64), false);
941 INTERCEPTOR(void *, malloc, SIZE_T size) {
942 GET_MALLOC_STACK_TRACE;
943 if (UNLIKELY(!msan_inited))
944 // Hack: dlsym calls malloc before REAL(malloc) is retrieved from dlsym.
945 return AllocateFromLocalPool(size);
946 return MsanReallocate(&stack, nullptr, size, sizeof(u64), false);
949 void __msan_allocated_memory(const void *data, uptr size) {
950 GET_MALLOC_STACK_TRACE;
951 if (flags()->poison_in_malloc) {
952 stack.tag = STACK_TRACE_TAG_POISON;
953 PoisonMemory(data, size, &stack);
957 void __msan_copy_shadow(void *dest, const void *src, uptr n) {
958 GET_STORE_STACK_TRACE;
959 MoveShadowAndOrigin(dest, src, n, &stack);
962 void __sanitizer_dtor_callback(const void *data, uptr size) {
963 GET_MALLOC_STACK_TRACE;
964 if (flags()->poison_in_dtor) {
965 stack.tag = STACK_TRACE_TAG_POISON;
966 PoisonMemory(data, size, &stack);
970 INTERCEPTOR(void *, mmap, void *addr, SIZE_T length, int prot, int flags,
971 int fd, OFF_T offset) {
972 if (msan_init_is_running)
973 return REAL(mmap)(addr, length, prot, flags, fd, offset);
974 ENSURE_MSAN_INITED();
975 if (addr && !MEM_IS_APP(addr)) {
976 if (flags & map_fixed) {
977 *__errno_location() = errno_EINVAL;
983 void *res = REAL(mmap)(addr, length, prot, flags, fd, offset);
984 if (res != (void*)-1)
985 __msan_unpoison(res, RoundUpTo(length, GetPageSize()));
989 #if !SANITIZER_FREEBSD
990 INTERCEPTOR(void *, mmap64, void *addr, SIZE_T length, int prot, int flags,
991 int fd, OFF64_T offset) {
992 ENSURE_MSAN_INITED();
993 if (addr && !MEM_IS_APP(addr)) {
994 if (flags & map_fixed) {
995 *__errno_location() = errno_EINVAL;
1001 void *res = REAL(mmap64)(addr, length, prot, flags, fd, offset);
1002 if (res != (void*)-1)
1003 __msan_unpoison(res, RoundUpTo(length, GetPageSize()));
1006 #define MSAN_MAYBE_INTERCEPT_MMAP64 INTERCEPT_FUNCTION(mmap64)
1008 #define MSAN_MAYBE_INTERCEPT_MMAP64
1011 INTERCEPTOR(int, getrusage, int who, void *usage) {
1012 ENSURE_MSAN_INITED();
1013 int res = REAL(getrusage)(who, usage);
1015 __msan_unpoison(usage, __sanitizer::struct_rusage_sz);
1020 class SignalHandlerScope {
1022 SignalHandlerScope() {
1023 if (MsanThread *t = GetCurrentThread())
1024 t->EnterSignalHandler();
1026 ~SignalHandlerScope() {
1027 if (MsanThread *t = GetCurrentThread())
1028 t->LeaveSignalHandler();
1032 // sigactions_mu guarantees atomicity of sigaction() and signal() calls.
1033 // Access to sigactions[] is gone with relaxed atomics to avoid data race with
1034 // the signal handler.
1035 const int kMaxSignals = 1024;
1036 static atomic_uintptr_t sigactions[kMaxSignals];
1037 static StaticSpinMutex sigactions_mu;
1039 static void SignalHandler(int signo) {
1040 SignalHandlerScope signal_handler_scope;
1041 ScopedThreadLocalStateBackup stlsb;
1044 typedef void (*signal_cb)(int x);
1046 (signal_cb)atomic_load(&sigactions[signo], memory_order_relaxed);
1050 static void SignalAction(int signo, void *si, void *uc) {
1051 SignalHandlerScope signal_handler_scope;
1052 ScopedThreadLocalStateBackup stlsb;
1054 __msan_unpoison(si, sizeof(__sanitizer_sigaction));
1055 __msan_unpoison(uc, __sanitizer::ucontext_t_sz);
1057 typedef void (*sigaction_cb)(int, void *, void *);
1059 (sigaction_cb)atomic_load(&sigactions[signo], memory_order_relaxed);
1063 INTERCEPTOR(int, sigaction, int signo, const __sanitizer_sigaction *act,
1064 __sanitizer_sigaction *oldact) {
1065 ENSURE_MSAN_INITED();
1066 // FIXME: check that *act is unpoisoned.
1067 // That requires intercepting all of sigemptyset, sigfillset, etc.
1069 if (flags()->wrap_signals) {
1070 SpinMutexLock lock(&sigactions_mu);
1071 CHECK_LT(signo, kMaxSignals);
1072 uptr old_cb = atomic_load(&sigactions[signo], memory_order_relaxed);
1073 __sanitizer_sigaction new_act;
1074 __sanitizer_sigaction *pnew_act = act ? &new_act : nullptr;
1076 REAL(memcpy)(pnew_act, act, sizeof(__sanitizer_sigaction));
1077 uptr cb = (uptr)pnew_act->sigaction;
1078 uptr new_cb = (pnew_act->sa_flags & __sanitizer::sa_siginfo)
1079 ? (uptr)SignalAction
1080 : (uptr)SignalHandler;
1081 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
1082 atomic_store(&sigactions[signo], cb, memory_order_relaxed);
1083 pnew_act->sigaction = (void (*)(int, void *, void *))new_cb;
1086 res = REAL(sigaction)(signo, pnew_act, oldact);
1087 if (res == 0 && oldact) {
1088 uptr cb = (uptr)oldact->sigaction;
1089 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
1090 oldact->sigaction = (void (*)(int, void *, void *))old_cb;
1094 res = REAL(sigaction)(signo, act, oldact);
1097 if (res == 0 && oldact) {
1098 __msan_unpoison(oldact, sizeof(__sanitizer_sigaction));
1103 INTERCEPTOR(int, signal, int signo, uptr cb) {
1104 ENSURE_MSAN_INITED();
1105 if (flags()->wrap_signals) {
1106 CHECK_LT(signo, kMaxSignals);
1107 SpinMutexLock lock(&sigactions_mu);
1108 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
1109 atomic_store(&sigactions[signo], cb, memory_order_relaxed);
1110 cb = (uptr) SignalHandler;
1112 return REAL(signal)(signo, cb);
1114 return REAL(signal)(signo, cb);
1118 extern "C" int pthread_attr_init(void *attr);
1119 extern "C" int pthread_attr_destroy(void *attr);
1121 static void *MsanThreadStartFunc(void *arg) {
1122 MsanThread *t = (MsanThread *)arg;
1123 SetCurrentThread(t);
1124 return t->ThreadStart();
1127 INTERCEPTOR(int, pthread_create, void *th, void *attr, void *(*callback)(void*),
1129 ENSURE_MSAN_INITED(); // for GetTlsSize()
1130 __sanitizer_pthread_attr_t myattr;
1132 pthread_attr_init(&myattr);
1136 AdjustStackSize(attr);
1138 MsanThread *t = MsanThread::Create(callback, param);
1140 int res = REAL(pthread_create)(th, attr, MsanThreadStartFunc, t);
1142 if (attr == &myattr)
1143 pthread_attr_destroy(&myattr);
1145 __msan_unpoison(th, __sanitizer::pthread_t_sz);
1150 INTERCEPTOR(int, pthread_key_create, __sanitizer_pthread_key_t *key,
1151 void (*dtor)(void *value)) {
1152 if (msan_init_is_running) return REAL(pthread_key_create)(key, dtor);
1153 ENSURE_MSAN_INITED();
1154 int res = REAL(pthread_key_create)(key, dtor);
1156 __msan_unpoison(key, sizeof(*key));
1160 INTERCEPTOR(int, pthread_join, void *th, void **retval) {
1161 ENSURE_MSAN_INITED();
1162 int res = REAL(pthread_join)(th, retval);
1164 __msan_unpoison(retval, sizeof(*retval));
1168 extern char *tzname[2];
1170 INTERCEPTOR(void, tzset, int fake) {
1171 ENSURE_MSAN_INITED();
1174 __msan_unpoison(tzname[0], REAL(strlen)(tzname[0]) + 1);
1176 __msan_unpoison(tzname[1], REAL(strlen)(tzname[1]) + 1);
1180 struct MSanAtExitRecord {
1181 void (*func)(void *arg);
1185 void MSanAtExitWrapper(void *arg) {
1187 MSanAtExitRecord *r = (MSanAtExitRecord *)arg;
1192 // Unpoison argument shadow for C++ module destructors.
1193 INTERCEPTOR(int, __cxa_atexit, void (*func)(void *), void *arg,
1195 if (msan_init_is_running) return REAL(__cxa_atexit)(func, arg, dso_handle);
1196 ENSURE_MSAN_INITED();
1197 MSanAtExitRecord *r =
1198 (MSanAtExitRecord *)InternalAlloc(sizeof(MSanAtExitRecord));
1201 return REAL(__cxa_atexit)(MSanAtExitWrapper, r, dso_handle);
1204 DECLARE_REAL(int, shmctl, int shmid, int cmd, void *buf)
1206 INTERCEPTOR(void *, shmat, int shmid, const void *shmaddr, int shmflg) {
1207 ENSURE_MSAN_INITED();
1208 void *p = REAL(shmat)(shmid, shmaddr, shmflg);
1209 if (p != (void *)-1) {
1210 __sanitizer_shmid_ds ds;
1211 int res = REAL(shmctl)(shmid, shmctl_ipc_stat, &ds);
1213 __msan_unpoison(p, ds.shm_segsz);
1219 static void BeforeFork() {
1220 StackDepotLockAll();
1221 ChainedOriginDepotLockAll();
1224 static void AfterFork() {
1225 ChainedOriginDepotUnlockAll();
1226 StackDepotUnlockAll();
1229 INTERCEPTOR(int, fork, void) {
1230 ENSURE_MSAN_INITED();
1232 int pid = REAL(fork)();
1237 INTERCEPTOR(int, openpty, int *amaster, int *aslave, char *name,
1238 const void *termp, const void *winp) {
1239 ENSURE_MSAN_INITED();
1240 InterceptorScope interceptor_scope;
1241 int res = REAL(openpty)(amaster, aslave, name, termp, winp);
1243 __msan_unpoison(amaster, sizeof(*amaster));
1244 __msan_unpoison(aslave, sizeof(*aslave));
1249 INTERCEPTOR(int, forkpty, int *amaster, char *name, const void *termp,
1251 ENSURE_MSAN_INITED();
1252 InterceptorScope interceptor_scope;
1253 int res = REAL(forkpty)(amaster, name, termp, winp);
1255 __msan_unpoison(amaster, sizeof(*amaster));
1259 struct MSanInterceptorContext {
1260 bool in_interceptor_scope;
1266 // FIXME: ask frontend whether we need to return failure.
1270 } // namespace __msan
1272 // A version of CHECK_UNPOISONED using a saved scope value. Used in common
1274 #define CHECK_UNPOISONED_CTX(ctx, x, n) \
1276 if (!((MSanInterceptorContext *)ctx)->in_interceptor_scope) \
1277 CHECK_UNPOISONED_0(x, n); \
1280 #define MSAN_INTERCEPT_FUNC(name) \
1282 if ((!INTERCEPT_FUNCTION(name) || !REAL(name))) \
1283 VReport(1, "MemorySanitizer: failed to intercept '" #name "'\n"); \
1286 #define MSAN_INTERCEPT_FUNC_VER(name, ver) \
1288 if ((!INTERCEPT_FUNCTION_VER(name, ver) || !REAL(name))) \
1290 1, "MemorySanitizer: failed to intercept '" #name "@@" #ver "'\n"); \
1293 #define COMMON_INTERCEPT_FUNCTION(name) MSAN_INTERCEPT_FUNC(name)
1294 #define COMMON_INTERCEPT_FUNCTION_VER(name, ver) \
1295 MSAN_INTERCEPT_FUNC_VER(name, ver)
1296 #define COMMON_INTERCEPTOR_UNPOISON_PARAM(count) \
1297 UnpoisonParam(count)
1298 #define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \
1299 __msan_unpoison(ptr, size)
1300 #define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \
1301 CHECK_UNPOISONED_CTX(ctx, ptr, size)
1302 #define COMMON_INTERCEPTOR_INITIALIZE_RANGE(ptr, size) \
1303 __msan_unpoison(ptr, size)
1304 #define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \
1305 if (msan_init_is_running) return REAL(func)(__VA_ARGS__); \
1306 ENSURE_MSAN_INITED(); \
1307 MSanInterceptorContext msan_ctx = {IsInInterceptorScope()}; \
1308 ctx = (void *)&msan_ctx; \
1310 InterceptorScope interceptor_scope; \
1311 __msan_unpoison(__errno_location(), sizeof(int)); /* NOLINT */
1312 #define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
1315 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
1318 #define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
1321 #define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
1324 #define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
1326 } while (false) // FIXME
1327 #define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \
1329 } while (false) // FIXME
1330 #define COMMON_INTERCEPTOR_BLOCK_REAL(name) REAL(name)
1331 #define COMMON_INTERCEPTOR_ON_EXIT(ctx) OnExit()
1332 #define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) \
1334 link_map *map = GET_LINK_MAP_BY_DLOPEN_HANDLE((handle)); \
1335 if (filename && map) \
1336 ForEachMappedRegion(map, __msan_unpoison); \
1339 #define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \
1340 if (MsanThread *t = GetCurrentThread()) { \
1341 *begin = t->tls_begin(); \
1342 *end = t->tls_end(); \
1344 *begin = *end = 0; \
1347 #define COMMON_INTERCEPTOR_MEMSET_IMPL(ctx, block, c, size) \
1350 return __msan_memset(block, c, size); \
1352 #define COMMON_INTERCEPTOR_MEMMOVE_IMPL(ctx, to, from, size) \
1355 return __msan_memmove(to, from, size); \
1357 #define COMMON_INTERCEPTOR_MEMCPY_IMPL(ctx, to, from, size) \
1360 return __msan_memcpy(to, from, size); \
1363 #include "sanitizer_common/sanitizer_platform_interceptors.h"
1364 #include "sanitizer_common/sanitizer_common_interceptors.inc"
1366 #define COMMON_SYSCALL_PRE_READ_RANGE(p, s) CHECK_UNPOISONED(p, s)
1367 #define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
1370 #define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
1373 #define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) __msan_unpoison(p, s)
1374 #include "sanitizer_common/sanitizer_common_syscalls.inc"
1383 INTERCEPTOR(int, dladdr, void *addr, dlinfo *info) {
1385 COMMON_INTERCEPTOR_ENTER(ctx, dladdr, addr, info);
1386 int res = REAL(dladdr)(addr, info);
1388 __msan_unpoison(info, sizeof(*info));
1389 if (info->dli_fname)
1390 __msan_unpoison(info->dli_fname, REAL(strlen)(info->dli_fname) + 1);
1391 if (info->dli_sname)
1392 __msan_unpoison(info->dli_sname, REAL(strlen)(info->dli_sname) + 1);
1397 INTERCEPTOR(char *, dlerror, int fake) {
1399 COMMON_INTERCEPTOR_ENTER(ctx, dlerror, fake);
1400 char *res = REAL(dlerror)(fake);
1401 if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
1405 typedef int (*dl_iterate_phdr_cb)(__sanitizer_dl_phdr_info *info, SIZE_T size,
1407 struct dl_iterate_phdr_data {
1408 dl_iterate_phdr_cb callback;
1412 static int msan_dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size,
1415 __msan_unpoison(info, size);
1416 if (info->dlpi_phdr && info->dlpi_phnum)
1417 __msan_unpoison(info->dlpi_phdr, struct_ElfW_Phdr_sz * info->dlpi_phnum);
1418 if (info->dlpi_name)
1419 __msan_unpoison(info->dlpi_name, REAL(strlen)(info->dlpi_name) + 1);
1421 dl_iterate_phdr_data *cbdata = (dl_iterate_phdr_data *)data;
1423 return cbdata->callback(info, size, cbdata->data);
1426 INTERCEPTOR(int, dl_iterate_phdr, dl_iterate_phdr_cb callback, void *data) {
1428 COMMON_INTERCEPTOR_ENTER(ctx, dl_iterate_phdr, callback, data);
1429 dl_iterate_phdr_data cbdata;
1430 cbdata.callback = callback;
1432 int res = REAL(dl_iterate_phdr)(msan_dl_iterate_phdr_cb, (void *)&cbdata);
1436 // These interface functions reside here so that they can use
1437 // REAL(memset), etc.
1438 void __msan_unpoison(const void *a, uptr size) {
1439 if (!MEM_IS_APP(a)) return;
1440 SetShadow(a, size, 0);
1443 void __msan_poison(const void *a, uptr size) {
1444 if (!MEM_IS_APP(a)) return;
1445 SetShadow(a, size, __msan::flags()->poison_heap_with_zeroes ? 0 : -1);
1448 void __msan_poison_stack(void *a, uptr size) {
1449 if (!MEM_IS_APP(a)) return;
1450 SetShadow(a, size, __msan::flags()->poison_stack_with_zeroes ? 0 : -1);
1453 void __msan_clear_and_unpoison(void *a, uptr size) {
1454 REAL(memset)(a, 0, size);
1455 SetShadow(a, size, 0);
1458 void *__msan_memcpy(void *dest, const void *src, SIZE_T n) {
1459 if (!msan_inited) return internal_memcpy(dest, src, n);
1460 if (msan_init_is_running || __msan::IsInSymbolizer())
1461 return REAL(memcpy)(dest, src, n);
1462 ENSURE_MSAN_INITED();
1463 GET_STORE_STACK_TRACE;
1464 void *res = REAL(memcpy)(dest, src, n);
1465 CopyShadowAndOrigin(dest, src, n, &stack);
1469 void *__msan_memset(void *s, int c, SIZE_T n) {
1470 if (!msan_inited) return internal_memset(s, c, n);
1471 if (msan_init_is_running) return REAL(memset)(s, c, n);
1472 ENSURE_MSAN_INITED();
1473 void *res = REAL(memset)(s, c, n);
1474 __msan_unpoison(s, n);
1478 void *__msan_memmove(void *dest, const void *src, SIZE_T n) {
1479 if (!msan_inited) return internal_memmove(dest, src, n);
1480 if (msan_init_is_running) return REAL(memmove)(dest, src, n);
1481 ENSURE_MSAN_INITED();
1482 GET_STORE_STACK_TRACE;
1483 void *res = REAL(memmove)(dest, src, n);
1484 MoveShadowAndOrigin(dest, src, n, &stack);
1488 void __msan_unpoison_string(const char* s) {
1489 if (!MEM_IS_APP(s)) return;
1490 __msan_unpoison(s, REAL(strlen)(s) + 1);
1495 void InitializeInterceptors() {
1496 static int inited = 0;
1497 CHECK_EQ(inited, 0);
1498 InitializeCommonInterceptors();
1500 INTERCEPT_FUNCTION(mmap);
1501 MSAN_MAYBE_INTERCEPT_MMAP64;
1502 INTERCEPT_FUNCTION(posix_memalign);
1503 MSAN_MAYBE_INTERCEPT_MEMALIGN;
1504 INTERCEPT_FUNCTION(__libc_memalign);
1505 INTERCEPT_FUNCTION(valloc);
1506 MSAN_MAYBE_INTERCEPT_PVALLOC;
1507 INTERCEPT_FUNCTION(malloc);
1508 INTERCEPT_FUNCTION(calloc);
1509 INTERCEPT_FUNCTION(realloc);
1510 INTERCEPT_FUNCTION(free);
1511 MSAN_MAYBE_INTERCEPT_CFREE;
1512 INTERCEPT_FUNCTION(malloc_usable_size);
1513 MSAN_MAYBE_INTERCEPT_MALLINFO;
1514 MSAN_MAYBE_INTERCEPT_MALLOPT;
1515 MSAN_MAYBE_INTERCEPT_MALLOC_STATS;
1516 INTERCEPT_FUNCTION(fread);
1517 MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED;
1518 INTERCEPT_FUNCTION(readlink);
1519 INTERCEPT_FUNCTION(memccpy);
1520 INTERCEPT_FUNCTION(mempcpy);
1521 INTERCEPT_FUNCTION(bcopy);
1522 INTERCEPT_FUNCTION(wmemset);
1523 INTERCEPT_FUNCTION(wmemcpy);
1524 INTERCEPT_FUNCTION(wmempcpy);
1525 INTERCEPT_FUNCTION(wmemmove);
1526 INTERCEPT_FUNCTION(strcpy); // NOLINT
1527 INTERCEPT_FUNCTION(stpcpy); // NOLINT
1528 INTERCEPT_FUNCTION(strdup);
1529 MSAN_MAYBE_INTERCEPT___STRDUP;
1530 INTERCEPT_FUNCTION(strndup);
1531 MSAN_MAYBE_INTERCEPT___STRNDUP;
1532 INTERCEPT_FUNCTION(strncpy); // NOLINT
1533 INTERCEPT_FUNCTION(gcvt);
1534 INTERCEPT_FUNCTION(strcat); // NOLINT
1535 INTERCEPT_FUNCTION(strncat); // NOLINT
1536 INTERCEPT_STRTO(strtod);
1537 INTERCEPT_STRTO(strtof);
1538 INTERCEPT_STRTO(strtold);
1539 INTERCEPT_STRTO(strtol);
1540 INTERCEPT_STRTO(strtoul);
1541 INTERCEPT_STRTO(strtoll);
1542 INTERCEPT_STRTO(strtoull);
1543 INTERCEPT_STRTO(wcstod);
1544 INTERCEPT_STRTO(wcstof);
1545 INTERCEPT_STRTO(wcstold);
1546 INTERCEPT_STRTO(wcstol);
1547 INTERCEPT_STRTO(wcstoul);
1548 INTERCEPT_STRTO(wcstoll);
1549 INTERCEPT_STRTO(wcstoull);
1550 #ifdef SANITIZER_NLDBL_VERSION
1551 INTERCEPT_FUNCTION_VER(vswprintf, SANITIZER_NLDBL_VERSION);
1552 INTERCEPT_FUNCTION_VER(swprintf, SANITIZER_NLDBL_VERSION);
1554 INTERCEPT_FUNCTION(vswprintf);
1555 INTERCEPT_FUNCTION(swprintf);
1557 INTERCEPT_FUNCTION(strxfrm);
1558 INTERCEPT_FUNCTION(strxfrm_l);
1559 INTERCEPT_FUNCTION(strftime);
1560 INTERCEPT_FUNCTION(strftime_l);
1561 MSAN_MAYBE_INTERCEPT___STRFTIME_L;
1562 INTERCEPT_FUNCTION(wcsftime);
1563 INTERCEPT_FUNCTION(wcsftime_l);
1564 MSAN_MAYBE_INTERCEPT___WCSFTIME_L;
1565 INTERCEPT_FUNCTION(mbtowc);
1566 INTERCEPT_FUNCTION(mbrtowc);
1567 INTERCEPT_FUNCTION(wcslen);
1568 INTERCEPT_FUNCTION(wcschr);
1569 INTERCEPT_FUNCTION(wcscpy);
1570 INTERCEPT_FUNCTION(wcscmp);
1571 INTERCEPT_FUNCTION(getenv);
1572 INTERCEPT_FUNCTION(setenv);
1573 INTERCEPT_FUNCTION(putenv);
1574 INTERCEPT_FUNCTION(gettimeofday);
1575 INTERCEPT_FUNCTION(fcvt);
1576 MSAN_MAYBE_INTERCEPT___FXSTAT;
1577 MSAN_INTERCEPT_FSTATAT;
1578 MSAN_MAYBE_INTERCEPT___FXSTAT64;
1579 MSAN_MAYBE_INTERCEPT___FXSTATAT64;
1580 INTERCEPT_FUNCTION(pipe);
1581 INTERCEPT_FUNCTION(pipe2);
1582 INTERCEPT_FUNCTION(socketpair);
1583 INTERCEPT_FUNCTION(fgets);
1584 MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED;
1585 INTERCEPT_FUNCTION(getrlimit);
1586 MSAN_MAYBE_INTERCEPT_GETRLIMIT64;
1587 MSAN_MAYBE_INTERCEPT_PRLIMIT;
1588 MSAN_MAYBE_INTERCEPT_PRLIMIT64;
1589 MSAN_INTERCEPT_UNAME;
1590 INTERCEPT_FUNCTION(gethostname);
1591 MSAN_MAYBE_INTERCEPT_EPOLL_WAIT;
1592 MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT;
1593 INTERCEPT_FUNCTION(dladdr);
1594 INTERCEPT_FUNCTION(dlerror);
1595 INTERCEPT_FUNCTION(dl_iterate_phdr);
1596 INTERCEPT_FUNCTION(getrusage);
1597 INTERCEPT_FUNCTION(sigaction);
1598 INTERCEPT_FUNCTION(signal);
1599 #if defined(__mips__)
1600 INTERCEPT_FUNCTION_VER(pthread_create, "GLIBC_2.2");
1602 INTERCEPT_FUNCTION(pthread_create);
1604 INTERCEPT_FUNCTION(pthread_key_create);
1605 INTERCEPT_FUNCTION(pthread_join);
1606 INTERCEPT_FUNCTION(tzset);
1607 INTERCEPT_FUNCTION(__cxa_atexit);
1608 INTERCEPT_FUNCTION(shmat);
1609 INTERCEPT_FUNCTION(fork);
1610 INTERCEPT_FUNCTION(openpty);
1611 INTERCEPT_FUNCTION(forkpty);
1615 } // namespace __msan