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_errno.h"
31 #include "sanitizer_common/sanitizer_stackdepot.h"
32 #include "sanitizer_common/sanitizer_libc.h"
33 #include "sanitizer_common/sanitizer_linux.h"
34 #include "sanitizer_common/sanitizer_tls_get_addr.h"
37 // ACHTUNG! No other system header includes in this file.
38 // Ideally, we should get rid of stdarg.h as well.
40 using namespace __msan;
42 using __sanitizer::memory_order;
43 using __sanitizer::atomic_load;
44 using __sanitizer::atomic_store;
45 using __sanitizer::atomic_uintptr_t;
47 DECLARE_REAL(SIZE_T, strlen, const char *s)
48 DECLARE_REAL(SIZE_T, strnlen, const char *s, SIZE_T maxlen)
49 DECLARE_REAL(void *, memcpy, void *dest, const void *src, uptr n)
50 DECLARE_REAL(void *, memset, void *dest, int c, uptr n)
52 // True if this is a nested interceptor.
53 static THREADLOCAL int in_interceptor_scope;
55 struct InterceptorScope {
56 InterceptorScope() { ++in_interceptor_scope; }
57 ~InterceptorScope() { --in_interceptor_scope; }
60 bool IsInInterceptorScope() {
61 return in_interceptor_scope;
64 static uptr allocated_for_dlsym;
65 static const uptr kDlsymAllocPoolSize = 1024;
66 static uptr alloc_memory_for_dlsym[kDlsymAllocPoolSize];
68 static bool IsInDlsymAllocPool(const void *ptr) {
69 uptr off = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
70 return off < sizeof(alloc_memory_for_dlsym);
73 static void *AllocateFromLocalPool(uptr size_in_bytes) {
74 uptr size_in_words = RoundUpTo(size_in_bytes, kWordSize) / kWordSize;
75 void *mem = (void *)&alloc_memory_for_dlsym[allocated_for_dlsym];
76 allocated_for_dlsym += size_in_words;
77 CHECK_LT(allocated_for_dlsym, kDlsymAllocPoolSize);
81 #define ENSURE_MSAN_INITED() do { \
82 CHECK(!msan_init_is_running); \
88 // Check that [x, x+n) range is unpoisoned.
89 #define CHECK_UNPOISONED_0(x, n) \
91 sptr offset = __msan_test_shadow(x, n); \
92 if (__msan::IsInSymbolizer()) \
94 if (offset >= 0 && __msan::flags()->report_umrs) { \
95 GET_CALLER_PC_BP_SP; \
97 ReportUMRInsideAddressRange(__func__, x, n, offset); \
98 __msan::PrintWarningWithOrigin( \
99 pc, bp, __msan_get_origin((const char *)x + offset)); \
100 if (__msan::flags()->halt_on_error) { \
101 Printf("Exiting\n"); \
107 // Check that [x, x+n) range is unpoisoned unless we are in a nested
109 #define CHECK_UNPOISONED(x, n) \
111 if (!IsInInterceptorScope()) CHECK_UNPOISONED_0(x, n); \
114 #define CHECK_UNPOISONED_STRING_OF_LEN(x, len, n) \
115 CHECK_UNPOISONED((x), \
116 common_flags()->strict_string_checks ? (len) + 1 : (n) )
118 #define CHECK_UNPOISONED_STRING(x, n) \
119 CHECK_UNPOISONED_STRING_OF_LEN((x), internal_strlen(x), (n))
121 #if !SANITIZER_FREEBSD
122 INTERCEPTOR(SIZE_T, fread_unlocked, void *ptr, SIZE_T size, SIZE_T nmemb,
124 ENSURE_MSAN_INITED();
125 SIZE_T res = REAL(fread_unlocked)(ptr, size, nmemb, file);
127 __msan_unpoison(ptr, res *size);
130 #define MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED INTERCEPT_FUNCTION(fread_unlocked)
132 #define MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED
135 INTERCEPTOR(SSIZE_T, readlink, const char *path, char *buf, SIZE_T bufsiz) {
136 ENSURE_MSAN_INITED();
137 CHECK_UNPOISONED_STRING(path, 0)
138 SSIZE_T res = REAL(readlink)(path, buf, bufsiz);
140 __msan_unpoison(buf, res);
144 INTERCEPTOR(void *, mempcpy, void *dest, const void *src, SIZE_T n) {
145 return (char *)__msan_memcpy(dest, src, n) + n;
148 INTERCEPTOR(void *, memccpy, void *dest, const void *src, int c, SIZE_T n) {
149 ENSURE_MSAN_INITED();
150 void *res = REAL(memccpy)(dest, src, c, n);
151 CHECK(!res || (res >= dest && res <= (char *)dest + n));
152 SIZE_T sz = res ? (char *)res - (char *)dest : n;
153 CHECK_UNPOISONED(src, sz);
154 __msan_unpoison(dest, sz);
158 INTERCEPTOR(void *, bcopy, const void *src, void *dest, SIZE_T n) {
159 return __msan_memmove(dest, src, n);
162 INTERCEPTOR(int, posix_memalign, void **memptr, SIZE_T alignment, SIZE_T size) {
163 GET_MALLOC_STACK_TRACE;
165 int res = msan_posix_memalign(memptr, alignment, size, &stack);
167 __msan_unpoison(memptr, sizeof(*memptr));
171 #if !SANITIZER_FREEBSD
172 INTERCEPTOR(void *, memalign, SIZE_T alignment, SIZE_T size) {
173 GET_MALLOC_STACK_TRACE;
174 return msan_memalign(alignment, size, &stack);
176 #define MSAN_MAYBE_INTERCEPT_MEMALIGN INTERCEPT_FUNCTION(memalign)
178 #define MSAN_MAYBE_INTERCEPT_MEMALIGN
181 INTERCEPTOR(void *, aligned_alloc, SIZE_T alignment, SIZE_T size) {
182 GET_MALLOC_STACK_TRACE;
183 return msan_aligned_alloc(alignment, size, &stack);
186 INTERCEPTOR(void *, __libc_memalign, SIZE_T alignment, SIZE_T size) {
187 GET_MALLOC_STACK_TRACE;
188 void *ptr = msan_memalign(alignment, size, &stack);
190 DTLS_on_libc_memalign(ptr, size);
194 INTERCEPTOR(void *, valloc, SIZE_T size) {
195 GET_MALLOC_STACK_TRACE;
196 return msan_valloc(size, &stack);
199 #if !SANITIZER_FREEBSD
200 INTERCEPTOR(void *, pvalloc, SIZE_T size) {
201 GET_MALLOC_STACK_TRACE;
202 return msan_pvalloc(size, &stack);
204 #define MSAN_MAYBE_INTERCEPT_PVALLOC INTERCEPT_FUNCTION(pvalloc)
206 #define MSAN_MAYBE_INTERCEPT_PVALLOC
209 INTERCEPTOR(void, free, void *ptr) {
210 GET_MALLOC_STACK_TRACE;
211 if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
212 MsanDeallocate(&stack, ptr);
215 #if !SANITIZER_FREEBSD
216 INTERCEPTOR(void, cfree, void *ptr) {
217 GET_MALLOC_STACK_TRACE;
218 if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
219 MsanDeallocate(&stack, ptr);
221 #define MSAN_MAYBE_INTERCEPT_CFREE INTERCEPT_FUNCTION(cfree)
223 #define MSAN_MAYBE_INTERCEPT_CFREE
226 INTERCEPTOR(uptr, malloc_usable_size, void *ptr) {
227 return __sanitizer_get_allocated_size(ptr);
230 #if !SANITIZER_FREEBSD
231 // This function actually returns a struct by value, but we can't unpoison a
232 // temporary! The following is equivalent on all supported platforms but
233 // aarch64 (which uses a different register for sret value). We have a test
235 INTERCEPTOR(void, mallinfo, __sanitizer_mallinfo *sret) {
238 asm volatile("mov %0,x8" : "=r" (r8));
239 sret = reinterpret_cast<__sanitizer_mallinfo*>(r8);
241 REAL(memset)(sret, 0, sizeof(*sret));
242 __msan_unpoison(sret, sizeof(*sret));
244 #define MSAN_MAYBE_INTERCEPT_MALLINFO INTERCEPT_FUNCTION(mallinfo)
246 #define MSAN_MAYBE_INTERCEPT_MALLINFO
249 #if !SANITIZER_FREEBSD
250 INTERCEPTOR(int, mallopt, int cmd, int value) {
253 #define MSAN_MAYBE_INTERCEPT_MALLOPT INTERCEPT_FUNCTION(mallopt)
255 #define MSAN_MAYBE_INTERCEPT_MALLOPT
258 #if !SANITIZER_FREEBSD
259 INTERCEPTOR(void, malloc_stats, void) {
260 // FIXME: implement, but don't call REAL(malloc_stats)!
262 #define MSAN_MAYBE_INTERCEPT_MALLOC_STATS INTERCEPT_FUNCTION(malloc_stats)
264 #define MSAN_MAYBE_INTERCEPT_MALLOC_STATS
267 INTERCEPTOR(char *, strcpy, char *dest, const char *src) { // NOLINT
268 ENSURE_MSAN_INITED();
269 GET_STORE_STACK_TRACE;
270 SIZE_T n = REAL(strlen)(src);
271 CHECK_UNPOISONED_STRING(src + n, 0);
272 char *res = REAL(strcpy)(dest, src); // NOLINT
273 CopyShadowAndOrigin(dest, src, n + 1, &stack);
277 INTERCEPTOR(char *, strncpy, char *dest, const char *src, SIZE_T n) { // NOLINT
278 ENSURE_MSAN_INITED();
279 GET_STORE_STACK_TRACE;
280 SIZE_T copy_size = REAL(strnlen)(src, n);
282 copy_size++; // trailing \0
283 char *res = REAL(strncpy)(dest, src, n); // NOLINT
284 CopyShadowAndOrigin(dest, src, copy_size, &stack);
285 __msan_unpoison(dest + copy_size, n - copy_size);
289 INTERCEPTOR(char *, stpcpy, char *dest, const char *src) { // NOLINT
290 ENSURE_MSAN_INITED();
291 GET_STORE_STACK_TRACE;
292 SIZE_T n = REAL(strlen)(src);
293 CHECK_UNPOISONED_STRING(src + n, 0);
294 char *res = REAL(stpcpy)(dest, src); // NOLINT
295 CopyShadowAndOrigin(dest, src, n + 1, &stack);
299 INTERCEPTOR(char *, strdup, char *src) {
300 ENSURE_MSAN_INITED();
301 GET_STORE_STACK_TRACE;
302 // On FreeBSD strdup() leverages strlen().
303 InterceptorScope interceptor_scope;
304 SIZE_T n = REAL(strlen)(src);
305 CHECK_UNPOISONED_STRING(src + n, 0);
306 char *res = REAL(strdup)(src);
307 CopyShadowAndOrigin(res, src, n + 1, &stack);
311 #if !SANITIZER_FREEBSD
312 INTERCEPTOR(char *, __strdup, char *src) {
313 ENSURE_MSAN_INITED();
314 GET_STORE_STACK_TRACE;
315 SIZE_T n = REAL(strlen)(src);
316 CHECK_UNPOISONED_STRING(src + n, 0);
317 char *res = REAL(__strdup)(src);
318 CopyShadowAndOrigin(res, src, n + 1, &stack);
321 #define MSAN_MAYBE_INTERCEPT___STRDUP INTERCEPT_FUNCTION(__strdup)
323 #define MSAN_MAYBE_INTERCEPT___STRDUP
326 INTERCEPTOR(char *, gcvt, double number, SIZE_T ndigit, char *buf) {
327 ENSURE_MSAN_INITED();
328 char *res = REAL(gcvt)(number, ndigit, buf);
329 SIZE_T n = REAL(strlen)(buf);
330 __msan_unpoison(buf, n + 1);
334 INTERCEPTOR(char *, strcat, char *dest, const char *src) { // NOLINT
335 ENSURE_MSAN_INITED();
336 GET_STORE_STACK_TRACE;
337 SIZE_T src_size = REAL(strlen)(src);
338 SIZE_T dest_size = REAL(strlen)(dest);
339 CHECK_UNPOISONED_STRING(src + src_size, 0);
340 CHECK_UNPOISONED_STRING(dest + dest_size, 0);
341 char *res = REAL(strcat)(dest, src); // NOLINT
342 CopyShadowAndOrigin(dest + dest_size, src, src_size + 1, &stack);
346 INTERCEPTOR(char *, strncat, char *dest, const char *src, SIZE_T n) { // NOLINT
347 ENSURE_MSAN_INITED();
348 GET_STORE_STACK_TRACE;
349 SIZE_T dest_size = REAL(strlen)(dest);
350 SIZE_T copy_size = REAL(strnlen)(src, n);
351 CHECK_UNPOISONED_STRING(dest + dest_size, 0);
352 char *res = REAL(strncat)(dest, src, n); // NOLINT
353 CopyShadowAndOrigin(dest + dest_size, src, copy_size, &stack);
354 __msan_unpoison(dest + dest_size + copy_size, 1); // \0
358 // Hack: always pass nptr and endptr as part of __VA_ARGS_ to avoid having to
359 // deal with empty __VA_ARGS__ in the case of INTERCEPTOR_STRTO.
360 #define INTERCEPTOR_STRTO_BODY(ret_type, func, ...) \
361 ENSURE_MSAN_INITED(); \
362 ret_type res = REAL(func)(__VA_ARGS__); \
363 __msan_unpoison(endptr, sizeof(*endptr)); \
366 #define INTERCEPTOR_STRTO(ret_type, func, char_type) \
367 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr) { \
368 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr); \
371 #define INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
372 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
374 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base); \
377 #define INTERCEPTOR_STRTO_LOC(ret_type, func, char_type) \
378 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
380 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, loc); \
383 #define INTERCEPTOR_STRTO_BASE_LOC(ret_type, func, char_type) \
384 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
385 int base, void *loc) { \
386 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base, loc); \
389 #define INTERCEPTORS_STRTO(ret_type, func, char_type) \
390 INTERCEPTOR_STRTO(ret_type, func, char_type) \
391 INTERCEPTOR_STRTO_LOC(ret_type, func##_l, char_type) \
392 INTERCEPTOR_STRTO_LOC(ret_type, __##func##_l, char_type) \
393 INTERCEPTOR_STRTO_LOC(ret_type, __##func##_internal, char_type)
395 #define INTERCEPTORS_STRTO_BASE(ret_type, func, char_type) \
396 INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
397 INTERCEPTOR_STRTO_BASE_LOC(ret_type, func##_l, char_type) \
398 INTERCEPTOR_STRTO_BASE_LOC(ret_type, __##func##_l, char_type) \
399 INTERCEPTOR_STRTO_BASE_LOC(ret_type, __##func##_internal, char_type)
401 INTERCEPTORS_STRTO(double, strtod, char) // NOLINT
402 INTERCEPTORS_STRTO(float, strtof, char) // NOLINT
403 INTERCEPTORS_STRTO(long double, strtold, char) // NOLINT
404 INTERCEPTORS_STRTO_BASE(long, strtol, char) // NOLINT
405 INTERCEPTORS_STRTO_BASE(long long, strtoll, char) // NOLINT
406 INTERCEPTORS_STRTO_BASE(unsigned long, strtoul, char) // NOLINT
407 INTERCEPTORS_STRTO_BASE(unsigned long long, strtoull, char) // NOLINT
409 INTERCEPTORS_STRTO(double, wcstod, wchar_t) // NOLINT
410 INTERCEPTORS_STRTO(float, wcstof, wchar_t) // NOLINT
411 INTERCEPTORS_STRTO(long double, wcstold, wchar_t) // NOLINT
412 INTERCEPTORS_STRTO_BASE(long, wcstol, wchar_t) // NOLINT
413 INTERCEPTORS_STRTO_BASE(long long, wcstoll, wchar_t) // NOLINT
414 INTERCEPTORS_STRTO_BASE(unsigned long, wcstoul, wchar_t) // NOLINT
415 INTERCEPTORS_STRTO_BASE(unsigned long long, wcstoull, wchar_t) // NOLINT
417 #define INTERCEPT_STRTO(func) \
418 INTERCEPT_FUNCTION(func); \
419 INTERCEPT_FUNCTION(func##_l); \
420 INTERCEPT_FUNCTION(__##func##_l); \
421 INTERCEPT_FUNCTION(__##func##_internal);
424 // FIXME: support *wprintf in common format interceptors.
425 INTERCEPTOR(int, vswprintf, void *str, uptr size, void *format, va_list ap) {
426 ENSURE_MSAN_INITED();
427 int res = REAL(vswprintf)(str, size, format, ap);
429 __msan_unpoison(str, 4 * (res + 1));
434 INTERCEPTOR(int, swprintf, void *str, uptr size, void *format, ...) {
435 ENSURE_MSAN_INITED();
437 va_start(ap, format);
438 int res = vswprintf(str, size, format, ap);
443 INTERCEPTOR(SIZE_T, strxfrm, char *dest, const char *src, SIZE_T n) {
444 ENSURE_MSAN_INITED();
445 CHECK_UNPOISONED(src, REAL(strlen)(src) + 1);
446 SIZE_T res = REAL(strxfrm)(dest, src, n);
447 if (res < n) __msan_unpoison(dest, res + 1);
451 INTERCEPTOR(SIZE_T, strxfrm_l, char *dest, const char *src, SIZE_T n,
453 ENSURE_MSAN_INITED();
454 CHECK_UNPOISONED(src, REAL(strlen)(src) + 1);
455 SIZE_T res = REAL(strxfrm_l)(dest, src, n, loc);
456 if (res < n) __msan_unpoison(dest, res + 1);
460 #define INTERCEPTOR_STRFTIME_BODY(char_type, ret_type, func, s, ...) \
461 ENSURE_MSAN_INITED(); \
462 ret_type res = REAL(func)(s, __VA_ARGS__); \
463 if (s) __msan_unpoison(s, sizeof(char_type) * (res + 1)); \
466 INTERCEPTOR(SIZE_T, strftime, char *s, SIZE_T max, const char *format,
467 __sanitizer_tm *tm) {
468 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, strftime, s, max, format, tm);
471 INTERCEPTOR(SIZE_T, strftime_l, char *s, SIZE_T max, const char *format,
472 __sanitizer_tm *tm, void *loc) {
473 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, strftime_l, s, max, format, tm, loc);
476 #if !SANITIZER_FREEBSD
477 INTERCEPTOR(SIZE_T, __strftime_l, char *s, SIZE_T max, const char *format,
478 __sanitizer_tm *tm, void *loc) {
479 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, __strftime_l, s, max, format, tm,
482 #define MSAN_MAYBE_INTERCEPT___STRFTIME_L INTERCEPT_FUNCTION(__strftime_l)
484 #define MSAN_MAYBE_INTERCEPT___STRFTIME_L
487 INTERCEPTOR(SIZE_T, wcsftime, wchar_t *s, SIZE_T max, const wchar_t *format,
488 __sanitizer_tm *tm) {
489 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, wcsftime, s, max, format, tm);
492 INTERCEPTOR(SIZE_T, wcsftime_l, wchar_t *s, SIZE_T max, const wchar_t *format,
493 __sanitizer_tm *tm, void *loc) {
494 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, wcsftime_l, s, max, format, tm,
498 #if !SANITIZER_FREEBSD
499 INTERCEPTOR(SIZE_T, __wcsftime_l, wchar_t *s, SIZE_T max, const wchar_t *format,
500 __sanitizer_tm *tm, void *loc) {
501 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, __wcsftime_l, s, max, format, tm,
504 #define MSAN_MAYBE_INTERCEPT___WCSFTIME_L INTERCEPT_FUNCTION(__wcsftime_l)
506 #define MSAN_MAYBE_INTERCEPT___WCSFTIME_L
509 INTERCEPTOR(int, mbtowc, wchar_t *dest, const char *src, SIZE_T n) {
510 ENSURE_MSAN_INITED();
511 int res = REAL(mbtowc)(dest, src, n);
512 if (res != -1 && dest) __msan_unpoison(dest, sizeof(wchar_t));
516 INTERCEPTOR(int, mbrtowc, wchar_t *dest, const char *src, SIZE_T n, void *ps) {
517 ENSURE_MSAN_INITED();
518 SIZE_T res = REAL(mbrtowc)(dest, src, n, ps);
519 if (res != (SIZE_T)-1 && dest) __msan_unpoison(dest, sizeof(wchar_t));
523 // wchar_t *wmemcpy(wchar_t *dest, const wchar_t *src, SIZE_T n);
524 INTERCEPTOR(wchar_t *, wmemcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
525 ENSURE_MSAN_INITED();
526 GET_STORE_STACK_TRACE;
527 wchar_t *res = REAL(wmemcpy)(dest, src, n);
528 CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
532 INTERCEPTOR(wchar_t *, wmempcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
533 ENSURE_MSAN_INITED();
534 GET_STORE_STACK_TRACE;
535 wchar_t *res = REAL(wmempcpy)(dest, src, n);
536 CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
540 INTERCEPTOR(wchar_t *, wmemset, wchar_t *s, wchar_t c, SIZE_T n) {
541 CHECK(MEM_IS_APP(s));
542 ENSURE_MSAN_INITED();
543 wchar_t *res = REAL(wmemset)(s, c, n);
544 __msan_unpoison(s, n * sizeof(wchar_t));
548 INTERCEPTOR(wchar_t *, wmemmove, wchar_t *dest, const wchar_t *src, SIZE_T n) {
549 ENSURE_MSAN_INITED();
550 GET_STORE_STACK_TRACE;
551 wchar_t *res = REAL(wmemmove)(dest, src, n);
552 MoveShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
556 INTERCEPTOR(int, wcscmp, const wchar_t *s1, const wchar_t *s2) {
557 ENSURE_MSAN_INITED();
558 int res = REAL(wcscmp)(s1, s2);
562 INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
563 ENSURE_MSAN_INITED();
564 int res = REAL(gettimeofday)(tv, tz);
566 __msan_unpoison(tv, 16);
568 __msan_unpoison(tz, 8);
572 INTERCEPTOR(char *, fcvt, double x, int a, int *b, int *c) {
573 ENSURE_MSAN_INITED();
574 char *res = REAL(fcvt)(x, a, b, c);
575 __msan_unpoison(b, sizeof(*b));
576 __msan_unpoison(c, sizeof(*c));
577 if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
581 INTERCEPTOR(char *, getenv, char *name) {
582 if (msan_init_is_running)
583 return REAL(getenv)(name);
584 ENSURE_MSAN_INITED();
585 char *res = REAL(getenv)(name);
586 if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
590 extern char **environ;
592 static void UnpoisonEnviron() {
593 char **envp = environ;
594 for (; *envp; ++envp) {
595 __msan_unpoison(envp, sizeof(*envp));
596 __msan_unpoison(*envp, REAL(strlen)(*envp) + 1);
598 // Trailing NULL pointer.
599 __msan_unpoison(envp, sizeof(*envp));
602 INTERCEPTOR(int, setenv, const char *name, const char *value, int overwrite) {
603 ENSURE_MSAN_INITED();
604 CHECK_UNPOISONED_STRING(name, 0)
605 int res = REAL(setenv)(name, value, overwrite);
606 if (!res) UnpoisonEnviron();
610 INTERCEPTOR(int, putenv, char *string) {
611 ENSURE_MSAN_INITED();
612 int res = REAL(putenv)(string);
613 if (!res) UnpoisonEnviron();
617 #if !SANITIZER_FREEBSD
618 INTERCEPTOR(int, __fxstat, int magic, int fd, void *buf) {
619 ENSURE_MSAN_INITED();
620 int res = REAL(__fxstat)(magic, fd, buf);
622 __msan_unpoison(buf, __sanitizer::struct_stat_sz);
625 #define MSAN_MAYBE_INTERCEPT___FXSTAT INTERCEPT_FUNCTION(__fxstat)
627 #define MSAN_MAYBE_INTERCEPT___FXSTAT
630 #if !SANITIZER_FREEBSD
631 INTERCEPTOR(int, __fxstat64, int magic, int fd, void *buf) {
632 ENSURE_MSAN_INITED();
633 int res = REAL(__fxstat64)(magic, fd, buf);
635 __msan_unpoison(buf, __sanitizer::struct_stat64_sz);
638 #define MSAN_MAYBE_INTERCEPT___FXSTAT64 INTERCEPT_FUNCTION(__fxstat64)
640 #define MSAN_MAYBE_INTERCEPT___FXSTAT64
643 #if SANITIZER_FREEBSD
644 INTERCEPTOR(int, fstatat, int fd, char *pathname, void *buf, int flags) {
645 ENSURE_MSAN_INITED();
646 int res = REAL(fstatat)(fd, pathname, buf, flags);
647 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz);
650 # define MSAN_INTERCEPT_FSTATAT INTERCEPT_FUNCTION(fstatat)
652 INTERCEPTOR(int, __fxstatat, int magic, int fd, char *pathname, void *buf,
654 ENSURE_MSAN_INITED();
655 int res = REAL(__fxstatat)(magic, fd, pathname, buf, flags);
656 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz);
659 # define MSAN_INTERCEPT_FSTATAT INTERCEPT_FUNCTION(__fxstatat)
662 #if !SANITIZER_FREEBSD
663 INTERCEPTOR(int, __fxstatat64, int magic, int fd, char *pathname, void *buf,
665 ENSURE_MSAN_INITED();
666 int res = REAL(__fxstatat64)(magic, fd, pathname, buf, flags);
667 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat64_sz);
670 #define MSAN_MAYBE_INTERCEPT___FXSTATAT64 INTERCEPT_FUNCTION(__fxstatat64)
672 #define MSAN_MAYBE_INTERCEPT___FXSTATAT64
675 INTERCEPTOR(int, pipe, int pipefd[2]) {
676 if (msan_init_is_running)
677 return REAL(pipe)(pipefd);
678 ENSURE_MSAN_INITED();
679 int res = REAL(pipe)(pipefd);
681 __msan_unpoison(pipefd, sizeof(int[2]));
685 INTERCEPTOR(int, pipe2, int pipefd[2], int flags) {
686 ENSURE_MSAN_INITED();
687 int res = REAL(pipe2)(pipefd, flags);
689 __msan_unpoison(pipefd, sizeof(int[2]));
693 INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int sv[2]) {
694 ENSURE_MSAN_INITED();
695 int res = REAL(socketpair)(domain, type, protocol, sv);
697 __msan_unpoison(sv, sizeof(int[2]));
701 INTERCEPTOR(char *, fgets, char *s, int size, void *stream) {
702 ENSURE_MSAN_INITED();
703 char *res = REAL(fgets)(s, size, stream);
705 __msan_unpoison(s, REAL(strlen)(s) + 1);
709 #if !SANITIZER_FREEBSD
710 INTERCEPTOR(char *, fgets_unlocked, char *s, int size, void *stream) {
711 ENSURE_MSAN_INITED();
712 char *res = REAL(fgets_unlocked)(s, size, stream);
714 __msan_unpoison(s, REAL(strlen)(s) + 1);
717 #define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED INTERCEPT_FUNCTION(fgets_unlocked)
719 #define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED
722 INTERCEPTOR(int, getrlimit, int resource, void *rlim) {
723 if (msan_init_is_running)
724 return REAL(getrlimit)(resource, rlim);
725 ENSURE_MSAN_INITED();
726 int res = REAL(getrlimit)(resource, rlim);
728 __msan_unpoison(rlim, __sanitizer::struct_rlimit_sz);
732 #if !SANITIZER_FREEBSD
733 INTERCEPTOR(int, getrlimit64, int resource, void *rlim) {
734 if (msan_init_is_running) return REAL(getrlimit64)(resource, rlim);
735 ENSURE_MSAN_INITED();
736 int res = REAL(getrlimit64)(resource, rlim);
737 if (!res) __msan_unpoison(rlim, __sanitizer::struct_rlimit64_sz);
741 INTERCEPTOR(int, prlimit, int pid, int resource, void *new_rlimit,
743 if (msan_init_is_running)
744 return REAL(prlimit)(pid, resource, new_rlimit, old_rlimit);
745 ENSURE_MSAN_INITED();
746 CHECK_UNPOISONED(new_rlimit, __sanitizer::struct_rlimit_sz);
747 int res = REAL(prlimit)(pid, resource, new_rlimit, old_rlimit);
748 if (!res) __msan_unpoison(old_rlimit, __sanitizer::struct_rlimit_sz);
752 INTERCEPTOR(int, prlimit64, int pid, int resource, void *new_rlimit,
754 if (msan_init_is_running)
755 return REAL(prlimit64)(pid, resource, new_rlimit, old_rlimit);
756 ENSURE_MSAN_INITED();
757 CHECK_UNPOISONED(new_rlimit, __sanitizer::struct_rlimit64_sz);
758 int res = REAL(prlimit64)(pid, resource, new_rlimit, old_rlimit);
759 if (!res) __msan_unpoison(old_rlimit, __sanitizer::struct_rlimit64_sz);
763 #define MSAN_MAYBE_INTERCEPT_GETRLIMIT64 INTERCEPT_FUNCTION(getrlimit64)
764 #define MSAN_MAYBE_INTERCEPT_PRLIMIT INTERCEPT_FUNCTION(prlimit)
765 #define MSAN_MAYBE_INTERCEPT_PRLIMIT64 INTERCEPT_FUNCTION(prlimit64)
767 #define MSAN_MAYBE_INTERCEPT_GETRLIMIT64
768 #define MSAN_MAYBE_INTERCEPT_PRLIMIT
769 #define MSAN_MAYBE_INTERCEPT_PRLIMIT64
772 #if SANITIZER_FREEBSD
773 // FreeBSD's <sys/utsname.h> define uname() as
774 // static __inline int uname(struct utsname *name) {
775 // return __xuname(SYS_NMLN, (void*)name);
777 INTERCEPTOR(int, __xuname, int size, void *utsname) {
778 ENSURE_MSAN_INITED();
779 int res = REAL(__xuname)(size, utsname);
781 __msan_unpoison(utsname, __sanitizer::struct_utsname_sz);
784 #define MSAN_INTERCEPT_UNAME INTERCEPT_FUNCTION(__xuname)
786 INTERCEPTOR(int, uname, struct utsname *utsname) {
787 ENSURE_MSAN_INITED();
788 int res = REAL(uname)(utsname);
790 __msan_unpoison(utsname, __sanitizer::struct_utsname_sz);
793 #define MSAN_INTERCEPT_UNAME INTERCEPT_FUNCTION(uname)
796 INTERCEPTOR(int, gethostname, char *name, SIZE_T len) {
797 ENSURE_MSAN_INITED();
798 int res = REAL(gethostname)(name, len);
800 SIZE_T real_len = REAL(strnlen)(name, len);
803 __msan_unpoison(name, real_len);
808 #if !SANITIZER_FREEBSD
809 INTERCEPTOR(int, epoll_wait, int epfd, void *events, int maxevents,
811 ENSURE_MSAN_INITED();
812 int res = REAL(epoll_wait)(epfd, events, maxevents, timeout);
814 __msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res);
818 #define MSAN_MAYBE_INTERCEPT_EPOLL_WAIT INTERCEPT_FUNCTION(epoll_wait)
820 #define MSAN_MAYBE_INTERCEPT_EPOLL_WAIT
823 #if !SANITIZER_FREEBSD
824 INTERCEPTOR(int, epoll_pwait, int epfd, void *events, int maxevents,
825 int timeout, void *sigmask) {
826 ENSURE_MSAN_INITED();
827 int res = REAL(epoll_pwait)(epfd, events, maxevents, timeout, sigmask);
829 __msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res);
833 #define MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT INTERCEPT_FUNCTION(epoll_pwait)
835 #define MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT
838 INTERCEPTOR(void *, calloc, SIZE_T nmemb, SIZE_T size) {
839 GET_MALLOC_STACK_TRACE;
840 if (UNLIKELY(!msan_inited))
841 // Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym.
842 return AllocateFromLocalPool(nmemb * size);
843 return msan_calloc(nmemb, size, &stack);
846 INTERCEPTOR(void *, realloc, void *ptr, SIZE_T size) {
847 GET_MALLOC_STACK_TRACE;
848 if (UNLIKELY(IsInDlsymAllocPool(ptr))) {
849 uptr offset = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
850 uptr copy_size = Min(size, kDlsymAllocPoolSize - offset);
852 if (UNLIKELY(!msan_inited)) {
853 new_ptr = AllocateFromLocalPool(copy_size);
856 new_ptr = msan_malloc(copy_size, &stack);
858 internal_memcpy(new_ptr, ptr, copy_size);
861 return msan_realloc(ptr, size, &stack);
864 INTERCEPTOR(void *, malloc, SIZE_T size) {
865 GET_MALLOC_STACK_TRACE;
866 if (UNLIKELY(!msan_inited))
867 // Hack: dlsym calls malloc before REAL(malloc) is retrieved from dlsym.
868 return AllocateFromLocalPool(size);
869 return msan_malloc(size, &stack);
872 void __msan_allocated_memory(const void *data, uptr size) {
873 GET_MALLOC_STACK_TRACE;
874 if (flags()->poison_in_malloc) {
875 stack.tag = STACK_TRACE_TAG_POISON;
876 PoisonMemory(data, size, &stack);
880 void __msan_copy_shadow(void *dest, const void *src, uptr n) {
881 GET_STORE_STACK_TRACE;
882 MoveShadowAndOrigin(dest, src, n, &stack);
885 void __sanitizer_dtor_callback(const void *data, uptr size) {
886 GET_MALLOC_STACK_TRACE;
887 if (flags()->poison_in_dtor) {
888 stack.tag = STACK_TRACE_TAG_POISON;
889 PoisonMemory(data, size, &stack);
893 INTERCEPTOR(void *, mmap, void *addr, SIZE_T length, int prot, int flags,
894 int fd, OFF_T offset) {
895 if (msan_init_is_running)
896 return REAL(mmap)(addr, length, prot, flags, fd, offset);
897 ENSURE_MSAN_INITED();
898 if (addr && !MEM_IS_APP(addr)) {
899 if (flags & map_fixed) {
900 errno = errno_EINVAL;
906 void *res = REAL(mmap)(addr, length, prot, flags, fd, offset);
907 if (res != (void*)-1)
908 __msan_unpoison(res, RoundUpTo(length, GetPageSize()));
912 #if !SANITIZER_FREEBSD
913 INTERCEPTOR(void *, mmap64, void *addr, SIZE_T length, int prot, int flags,
914 int fd, OFF64_T offset) {
915 ENSURE_MSAN_INITED();
916 if (addr && !MEM_IS_APP(addr)) {
917 if (flags & map_fixed) {
918 errno = errno_EINVAL;
924 void *res = REAL(mmap64)(addr, length, prot, flags, fd, offset);
925 if (res != (void*)-1)
926 __msan_unpoison(res, RoundUpTo(length, GetPageSize()));
929 #define MSAN_MAYBE_INTERCEPT_MMAP64 INTERCEPT_FUNCTION(mmap64)
931 #define MSAN_MAYBE_INTERCEPT_MMAP64
934 INTERCEPTOR(int, getrusage, int who, void *usage) {
935 ENSURE_MSAN_INITED();
936 int res = REAL(getrusage)(who, usage);
938 __msan_unpoison(usage, __sanitizer::struct_rusage_sz);
943 class SignalHandlerScope {
945 SignalHandlerScope() {
946 if (MsanThread *t = GetCurrentThread())
947 t->EnterSignalHandler();
949 ~SignalHandlerScope() {
950 if (MsanThread *t = GetCurrentThread())
951 t->LeaveSignalHandler();
955 // sigactions_mu guarantees atomicity of sigaction() and signal() calls.
956 // Access to sigactions[] is gone with relaxed atomics to avoid data race with
957 // the signal handler.
958 const int kMaxSignals = 1024;
959 static atomic_uintptr_t sigactions[kMaxSignals];
960 static StaticSpinMutex sigactions_mu;
962 static void SignalHandler(int signo) {
963 SignalHandlerScope signal_handler_scope;
964 ScopedThreadLocalStateBackup stlsb;
967 typedef void (*signal_cb)(int x);
969 (signal_cb)atomic_load(&sigactions[signo], memory_order_relaxed);
973 static void SignalAction(int signo, void *si, void *uc) {
974 SignalHandlerScope signal_handler_scope;
975 ScopedThreadLocalStateBackup stlsb;
977 __msan_unpoison(si, sizeof(__sanitizer_sigaction));
978 __msan_unpoison(uc, __sanitizer::ucontext_t_sz);
980 typedef void (*sigaction_cb)(int, void *, void *);
982 (sigaction_cb)atomic_load(&sigactions[signo], memory_order_relaxed);
986 INTERCEPTOR(int, sigaction, int signo, const __sanitizer_sigaction *act,
987 __sanitizer_sigaction *oldact) {
988 ENSURE_MSAN_INITED();
989 // FIXME: check that *act is unpoisoned.
990 // That requires intercepting all of sigemptyset, sigfillset, etc.
992 if (flags()->wrap_signals) {
993 SpinMutexLock lock(&sigactions_mu);
994 CHECK_LT(signo, kMaxSignals);
995 uptr old_cb = atomic_load(&sigactions[signo], memory_order_relaxed);
996 __sanitizer_sigaction new_act;
997 __sanitizer_sigaction *pnew_act = act ? &new_act : nullptr;
999 REAL(memcpy)(pnew_act, act, sizeof(__sanitizer_sigaction));
1000 uptr cb = (uptr)pnew_act->sigaction;
1001 uptr new_cb = (pnew_act->sa_flags & __sanitizer::sa_siginfo)
1002 ? (uptr)SignalAction
1003 : (uptr)SignalHandler;
1004 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
1005 atomic_store(&sigactions[signo], cb, memory_order_relaxed);
1006 pnew_act->sigaction = (void (*)(int, void *, void *))new_cb;
1009 res = REAL(sigaction)(signo, pnew_act, oldact);
1010 if (res == 0 && oldact) {
1011 uptr cb = (uptr)oldact->sigaction;
1012 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
1013 oldact->sigaction = (void (*)(int, void *, void *))old_cb;
1017 res = REAL(sigaction)(signo, act, oldact);
1020 if (res == 0 && oldact) {
1021 __msan_unpoison(oldact, sizeof(__sanitizer_sigaction));
1026 INTERCEPTOR(int, signal, int signo, uptr cb) {
1027 ENSURE_MSAN_INITED();
1028 if (flags()->wrap_signals) {
1029 CHECK_LT(signo, kMaxSignals);
1030 SpinMutexLock lock(&sigactions_mu);
1031 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
1032 atomic_store(&sigactions[signo], cb, memory_order_relaxed);
1033 cb = (uptr) SignalHandler;
1035 return REAL(signal)(signo, cb);
1037 return REAL(signal)(signo, cb);
1041 extern "C" int pthread_attr_init(void *attr);
1042 extern "C" int pthread_attr_destroy(void *attr);
1044 static void *MsanThreadStartFunc(void *arg) {
1045 MsanThread *t = (MsanThread *)arg;
1046 SetCurrentThread(t);
1047 return t->ThreadStart();
1050 INTERCEPTOR(int, pthread_create, void *th, void *attr, void *(*callback)(void*),
1052 ENSURE_MSAN_INITED(); // for GetTlsSize()
1053 __sanitizer_pthread_attr_t myattr;
1055 pthread_attr_init(&myattr);
1059 AdjustStackSize(attr);
1061 MsanThread *t = MsanThread::Create(callback, param);
1063 int res = REAL(pthread_create)(th, attr, MsanThreadStartFunc, t);
1065 if (attr == &myattr)
1066 pthread_attr_destroy(&myattr);
1068 __msan_unpoison(th, __sanitizer::pthread_t_sz);
1073 INTERCEPTOR(int, pthread_key_create, __sanitizer_pthread_key_t *key,
1074 void (*dtor)(void *value)) {
1075 if (msan_init_is_running) return REAL(pthread_key_create)(key, dtor);
1076 ENSURE_MSAN_INITED();
1077 int res = REAL(pthread_key_create)(key, dtor);
1079 __msan_unpoison(key, sizeof(*key));
1083 INTERCEPTOR(int, pthread_join, void *th, void **retval) {
1084 ENSURE_MSAN_INITED();
1085 int res = REAL(pthread_join)(th, retval);
1087 __msan_unpoison(retval, sizeof(*retval));
1091 extern char *tzname[2];
1093 INTERCEPTOR(void, tzset, int fake) {
1094 ENSURE_MSAN_INITED();
1097 __msan_unpoison(tzname[0], REAL(strlen)(tzname[0]) + 1);
1099 __msan_unpoison(tzname[1], REAL(strlen)(tzname[1]) + 1);
1103 struct MSanAtExitRecord {
1104 void (*func)(void *arg);
1108 void MSanAtExitWrapper(void *arg) {
1110 MSanAtExitRecord *r = (MSanAtExitRecord *)arg;
1115 // Unpoison argument shadow for C++ module destructors.
1116 INTERCEPTOR(int, __cxa_atexit, void (*func)(void *), void *arg,
1118 if (msan_init_is_running) return REAL(__cxa_atexit)(func, arg, dso_handle);
1119 ENSURE_MSAN_INITED();
1120 MSanAtExitRecord *r =
1121 (MSanAtExitRecord *)InternalAlloc(sizeof(MSanAtExitRecord));
1124 return REAL(__cxa_atexit)(MSanAtExitWrapper, r, dso_handle);
1127 DECLARE_REAL(int, shmctl, int shmid, int cmd, void *buf)
1129 INTERCEPTOR(void *, shmat, int shmid, const void *shmaddr, int shmflg) {
1130 ENSURE_MSAN_INITED();
1131 void *p = REAL(shmat)(shmid, shmaddr, shmflg);
1132 if (p != (void *)-1) {
1133 __sanitizer_shmid_ds ds;
1134 int res = REAL(shmctl)(shmid, shmctl_ipc_stat, &ds);
1136 __msan_unpoison(p, ds.shm_segsz);
1142 static void BeforeFork() {
1143 StackDepotLockAll();
1144 ChainedOriginDepotLockAll();
1147 static void AfterFork() {
1148 ChainedOriginDepotUnlockAll();
1149 StackDepotUnlockAll();
1152 INTERCEPTOR(int, fork, void) {
1153 ENSURE_MSAN_INITED();
1155 int pid = REAL(fork)();
1160 INTERCEPTOR(int, openpty, int *amaster, int *aslave, char *name,
1161 const void *termp, const void *winp) {
1162 ENSURE_MSAN_INITED();
1163 InterceptorScope interceptor_scope;
1164 int res = REAL(openpty)(amaster, aslave, name, termp, winp);
1166 __msan_unpoison(amaster, sizeof(*amaster));
1167 __msan_unpoison(aslave, sizeof(*aslave));
1172 INTERCEPTOR(int, forkpty, int *amaster, char *name, const void *termp,
1174 ENSURE_MSAN_INITED();
1175 InterceptorScope interceptor_scope;
1176 int res = REAL(forkpty)(amaster, name, termp, winp);
1178 __msan_unpoison(amaster, sizeof(*amaster));
1182 struct MSanInterceptorContext {
1183 bool in_interceptor_scope;
1189 // FIXME: ask frontend whether we need to return failure.
1193 } // namespace __msan
1195 // A version of CHECK_UNPOISONED using a saved scope value. Used in common
1197 #define CHECK_UNPOISONED_CTX(ctx, x, n) \
1199 if (!((MSanInterceptorContext *)ctx)->in_interceptor_scope) \
1200 CHECK_UNPOISONED_0(x, n); \
1203 #define MSAN_INTERCEPT_FUNC(name) \
1205 if ((!INTERCEPT_FUNCTION(name) || !REAL(name))) \
1206 VReport(1, "MemorySanitizer: failed to intercept '" #name "'\n"); \
1209 #define MSAN_INTERCEPT_FUNC_VER(name, ver) \
1211 if ((!INTERCEPT_FUNCTION_VER(name, ver) || !REAL(name))) \
1213 1, "MemorySanitizer: failed to intercept '" #name "@@" #ver "'\n"); \
1216 #define COMMON_INTERCEPT_FUNCTION(name) MSAN_INTERCEPT_FUNC(name)
1217 #define COMMON_INTERCEPT_FUNCTION_VER(name, ver) \
1218 MSAN_INTERCEPT_FUNC_VER(name, ver)
1219 #define COMMON_INTERCEPTOR_UNPOISON_PARAM(count) \
1220 UnpoisonParam(count)
1221 #define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \
1222 __msan_unpoison(ptr, size)
1223 #define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \
1224 CHECK_UNPOISONED_CTX(ctx, ptr, size)
1225 #define COMMON_INTERCEPTOR_INITIALIZE_RANGE(ptr, size) \
1226 __msan_unpoison(ptr, size)
1227 #define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \
1228 if (msan_init_is_running) return REAL(func)(__VA_ARGS__); \
1229 ENSURE_MSAN_INITED(); \
1230 MSanInterceptorContext msan_ctx = {IsInInterceptorScope()}; \
1231 ctx = (void *)&msan_ctx; \
1233 InterceptorScope interceptor_scope; \
1234 __msan_unpoison(__errno_location(), sizeof(int)); /* NOLINT */
1235 #define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
1238 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
1241 #define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
1244 #define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
1247 #define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
1249 } while (false) // FIXME
1250 #define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \
1252 } while (false) // FIXME
1253 #define COMMON_INTERCEPTOR_BLOCK_REAL(name) REAL(name)
1254 #define COMMON_INTERCEPTOR_ON_EXIT(ctx) OnExit()
1255 #define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) \
1257 link_map *map = GET_LINK_MAP_BY_DLOPEN_HANDLE((handle)); \
1258 if (filename && map) \
1259 ForEachMappedRegion(map, __msan_unpoison); \
1262 #define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \
1263 if (MsanThread *t = GetCurrentThread()) { \
1264 *begin = t->tls_begin(); \
1265 *end = t->tls_end(); \
1267 *begin = *end = 0; \
1270 #define COMMON_INTERCEPTOR_MEMSET_IMPL(ctx, block, c, size) \
1273 return __msan_memset(block, c, size); \
1275 #define COMMON_INTERCEPTOR_MEMMOVE_IMPL(ctx, to, from, size) \
1278 return __msan_memmove(to, from, size); \
1280 #define COMMON_INTERCEPTOR_MEMCPY_IMPL(ctx, to, from, size) \
1283 return __msan_memcpy(to, from, size); \
1286 #define COMMON_INTERCEPTOR_COPY_STRING(ctx, to, from, size) \
1288 GET_STORE_STACK_TRACE; \
1289 CopyShadowAndOrigin(to, from, size, &stack); \
1290 __msan_unpoison(to + size, 1); \
1293 #include "sanitizer_common/sanitizer_platform_interceptors.h"
1294 #include "sanitizer_common/sanitizer_common_interceptors.inc"
1296 #define COMMON_SYSCALL_PRE_READ_RANGE(p, s) CHECK_UNPOISONED(p, s)
1297 #define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
1300 #define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
1303 #define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) __msan_unpoison(p, s)
1304 #include "sanitizer_common/sanitizer_common_syscalls.inc"
1313 INTERCEPTOR(int, dladdr, void *addr, dlinfo *info) {
1315 COMMON_INTERCEPTOR_ENTER(ctx, dladdr, addr, info);
1316 int res = REAL(dladdr)(addr, info);
1318 __msan_unpoison(info, sizeof(*info));
1319 if (info->dli_fname)
1320 __msan_unpoison(info->dli_fname, REAL(strlen)(info->dli_fname) + 1);
1321 if (info->dli_sname)
1322 __msan_unpoison(info->dli_sname, REAL(strlen)(info->dli_sname) + 1);
1327 INTERCEPTOR(char *, dlerror, int fake) {
1329 COMMON_INTERCEPTOR_ENTER(ctx, dlerror, fake);
1330 char *res = REAL(dlerror)(fake);
1331 if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
1335 typedef int (*dl_iterate_phdr_cb)(__sanitizer_dl_phdr_info *info, SIZE_T size,
1337 struct dl_iterate_phdr_data {
1338 dl_iterate_phdr_cb callback;
1342 static int msan_dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size,
1345 __msan_unpoison(info, size);
1346 if (info->dlpi_phdr && info->dlpi_phnum)
1347 __msan_unpoison(info->dlpi_phdr, struct_ElfW_Phdr_sz * info->dlpi_phnum);
1348 if (info->dlpi_name)
1349 __msan_unpoison(info->dlpi_name, REAL(strlen)(info->dlpi_name) + 1);
1351 dl_iterate_phdr_data *cbdata = (dl_iterate_phdr_data *)data;
1353 return cbdata->callback(info, size, cbdata->data);
1356 INTERCEPTOR(int, dl_iterate_phdr, dl_iterate_phdr_cb callback, void *data) {
1358 COMMON_INTERCEPTOR_ENTER(ctx, dl_iterate_phdr, callback, data);
1359 dl_iterate_phdr_data cbdata;
1360 cbdata.callback = callback;
1362 int res = REAL(dl_iterate_phdr)(msan_dl_iterate_phdr_cb, (void *)&cbdata);
1366 // wchar_t *wcschr(const wchar_t *wcs, wchar_t wc);
1367 INTERCEPTOR(wchar_t *, wcschr, void *s, wchar_t wc, void *ps) {
1368 ENSURE_MSAN_INITED();
1369 wchar_t *res = REAL(wcschr)(s, wc, ps);
1373 // wchar_t *wcscpy(wchar_t *dest, const wchar_t *src);
1374 INTERCEPTOR(wchar_t *, wcscpy, wchar_t *dest, const wchar_t *src) {
1375 ENSURE_MSAN_INITED();
1376 GET_STORE_STACK_TRACE;
1377 wchar_t *res = REAL(wcscpy)(dest, src);
1378 CopyShadowAndOrigin(dest, src, sizeof(wchar_t) * (REAL(wcslen)(src) + 1),
1383 INTERCEPTOR(wchar_t *, wcsncpy, wchar_t *dest, const wchar_t *src,
1384 SIZE_T n) { // NOLINT
1385 ENSURE_MSAN_INITED();
1386 GET_STORE_STACK_TRACE;
1387 SIZE_T copy_size = REAL(wcsnlen)(src, n);
1388 if (copy_size < n) copy_size++; // trailing \0
1389 wchar_t *res = REAL(wcsncpy)(dest, src, n); // NOLINT
1390 CopyShadowAndOrigin(dest, src, copy_size * sizeof(wchar_t), &stack);
1391 __msan_unpoison(dest + copy_size, (n - copy_size) * sizeof(wchar_t));
1395 // These interface functions reside here so that they can use
1396 // REAL(memset), etc.
1397 void __msan_unpoison(const void *a, uptr size) {
1398 if (!MEM_IS_APP(a)) return;
1399 SetShadow(a, size, 0);
1402 void __msan_poison(const void *a, uptr size) {
1403 if (!MEM_IS_APP(a)) return;
1404 SetShadow(a, size, __msan::flags()->poison_heap_with_zeroes ? 0 : -1);
1407 void __msan_poison_stack(void *a, uptr size) {
1408 if (!MEM_IS_APP(a)) return;
1409 SetShadow(a, size, __msan::flags()->poison_stack_with_zeroes ? 0 : -1);
1412 void __msan_clear_and_unpoison(void *a, uptr size) {
1413 REAL(memset)(a, 0, size);
1414 SetShadow(a, size, 0);
1417 void *__msan_memcpy(void *dest, const void *src, SIZE_T n) {
1418 if (!msan_inited) return internal_memcpy(dest, src, n);
1419 if (msan_init_is_running || __msan::IsInSymbolizer())
1420 return REAL(memcpy)(dest, src, n);
1421 ENSURE_MSAN_INITED();
1422 GET_STORE_STACK_TRACE;
1423 void *res = REAL(memcpy)(dest, src, n);
1424 CopyShadowAndOrigin(dest, src, n, &stack);
1428 void *__msan_memset(void *s, int c, SIZE_T n) {
1429 if (!msan_inited) return internal_memset(s, c, n);
1430 if (msan_init_is_running) return REAL(memset)(s, c, n);
1431 ENSURE_MSAN_INITED();
1432 void *res = REAL(memset)(s, c, n);
1433 __msan_unpoison(s, n);
1437 void *__msan_memmove(void *dest, const void *src, SIZE_T n) {
1438 if (!msan_inited) return internal_memmove(dest, src, n);
1439 if (msan_init_is_running) return REAL(memmove)(dest, src, n);
1440 ENSURE_MSAN_INITED();
1441 GET_STORE_STACK_TRACE;
1442 void *res = REAL(memmove)(dest, src, n);
1443 MoveShadowAndOrigin(dest, src, n, &stack);
1447 void __msan_unpoison_string(const char* s) {
1448 if (!MEM_IS_APP(s)) return;
1449 __msan_unpoison(s, REAL(strlen)(s) + 1);
1454 void InitializeInterceptors() {
1455 static int inited = 0;
1456 CHECK_EQ(inited, 0);
1457 InitializeCommonInterceptors();
1459 INTERCEPT_FUNCTION(mmap);
1460 MSAN_MAYBE_INTERCEPT_MMAP64;
1461 INTERCEPT_FUNCTION(posix_memalign);
1462 MSAN_MAYBE_INTERCEPT_MEMALIGN;
1463 INTERCEPT_FUNCTION(__libc_memalign);
1464 INTERCEPT_FUNCTION(valloc);
1465 MSAN_MAYBE_INTERCEPT_PVALLOC;
1466 INTERCEPT_FUNCTION(malloc);
1467 INTERCEPT_FUNCTION(calloc);
1468 INTERCEPT_FUNCTION(realloc);
1469 INTERCEPT_FUNCTION(free);
1470 MSAN_MAYBE_INTERCEPT_CFREE;
1471 INTERCEPT_FUNCTION(malloc_usable_size);
1472 MSAN_MAYBE_INTERCEPT_MALLINFO;
1473 MSAN_MAYBE_INTERCEPT_MALLOPT;
1474 MSAN_MAYBE_INTERCEPT_MALLOC_STATS;
1475 INTERCEPT_FUNCTION(fread);
1476 MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED;
1477 INTERCEPT_FUNCTION(readlink);
1478 INTERCEPT_FUNCTION(memccpy);
1479 INTERCEPT_FUNCTION(mempcpy);
1480 INTERCEPT_FUNCTION(bcopy);
1481 INTERCEPT_FUNCTION(wmemset);
1482 INTERCEPT_FUNCTION(wmemcpy);
1483 INTERCEPT_FUNCTION(wmempcpy);
1484 INTERCEPT_FUNCTION(wmemmove);
1485 INTERCEPT_FUNCTION(strcpy); // NOLINT
1486 INTERCEPT_FUNCTION(stpcpy); // NOLINT
1487 INTERCEPT_FUNCTION(strdup);
1488 MSAN_MAYBE_INTERCEPT___STRDUP;
1489 INTERCEPT_FUNCTION(strncpy); // NOLINT
1490 INTERCEPT_FUNCTION(gcvt);
1491 INTERCEPT_FUNCTION(strcat); // NOLINT
1492 INTERCEPT_FUNCTION(strncat); // NOLINT
1493 INTERCEPT_STRTO(strtod);
1494 INTERCEPT_STRTO(strtof);
1495 INTERCEPT_STRTO(strtold);
1496 INTERCEPT_STRTO(strtol);
1497 INTERCEPT_STRTO(strtoul);
1498 INTERCEPT_STRTO(strtoll);
1499 INTERCEPT_STRTO(strtoull);
1500 INTERCEPT_STRTO(wcstod);
1501 INTERCEPT_STRTO(wcstof);
1502 INTERCEPT_STRTO(wcstold);
1503 INTERCEPT_STRTO(wcstol);
1504 INTERCEPT_STRTO(wcstoul);
1505 INTERCEPT_STRTO(wcstoll);
1506 INTERCEPT_STRTO(wcstoull);
1507 #ifdef SANITIZER_NLDBL_VERSION
1508 INTERCEPT_FUNCTION_VER(vswprintf, SANITIZER_NLDBL_VERSION);
1509 INTERCEPT_FUNCTION_VER(swprintf, SANITIZER_NLDBL_VERSION);
1511 INTERCEPT_FUNCTION(vswprintf);
1512 INTERCEPT_FUNCTION(swprintf);
1514 INTERCEPT_FUNCTION(strxfrm);
1515 INTERCEPT_FUNCTION(strxfrm_l);
1516 INTERCEPT_FUNCTION(strftime);
1517 INTERCEPT_FUNCTION(strftime_l);
1518 MSAN_MAYBE_INTERCEPT___STRFTIME_L;
1519 INTERCEPT_FUNCTION(wcsftime);
1520 INTERCEPT_FUNCTION(wcsftime_l);
1521 MSAN_MAYBE_INTERCEPT___WCSFTIME_L;
1522 INTERCEPT_FUNCTION(mbtowc);
1523 INTERCEPT_FUNCTION(mbrtowc);
1524 INTERCEPT_FUNCTION(wcslen);
1525 INTERCEPT_FUNCTION(wcsnlen);
1526 INTERCEPT_FUNCTION(wcschr);
1527 INTERCEPT_FUNCTION(wcscpy);
1528 INTERCEPT_FUNCTION(wcsncpy);
1529 INTERCEPT_FUNCTION(wcscmp);
1530 INTERCEPT_FUNCTION(getenv);
1531 INTERCEPT_FUNCTION(setenv);
1532 INTERCEPT_FUNCTION(putenv);
1533 INTERCEPT_FUNCTION(gettimeofday);
1534 INTERCEPT_FUNCTION(fcvt);
1535 MSAN_MAYBE_INTERCEPT___FXSTAT;
1536 MSAN_INTERCEPT_FSTATAT;
1537 MSAN_MAYBE_INTERCEPT___FXSTAT64;
1538 MSAN_MAYBE_INTERCEPT___FXSTATAT64;
1539 INTERCEPT_FUNCTION(pipe);
1540 INTERCEPT_FUNCTION(pipe2);
1541 INTERCEPT_FUNCTION(socketpair);
1542 INTERCEPT_FUNCTION(fgets);
1543 MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED;
1544 INTERCEPT_FUNCTION(getrlimit);
1545 MSAN_MAYBE_INTERCEPT_GETRLIMIT64;
1546 MSAN_MAYBE_INTERCEPT_PRLIMIT;
1547 MSAN_MAYBE_INTERCEPT_PRLIMIT64;
1548 MSAN_INTERCEPT_UNAME;
1549 INTERCEPT_FUNCTION(gethostname);
1550 MSAN_MAYBE_INTERCEPT_EPOLL_WAIT;
1551 MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT;
1552 INTERCEPT_FUNCTION(dladdr);
1553 INTERCEPT_FUNCTION(dlerror);
1554 INTERCEPT_FUNCTION(dl_iterate_phdr);
1555 INTERCEPT_FUNCTION(getrusage);
1556 INTERCEPT_FUNCTION(sigaction);
1557 INTERCEPT_FUNCTION(signal);
1558 #if defined(__mips__)
1559 INTERCEPT_FUNCTION_VER(pthread_create, "GLIBC_2.2");
1561 INTERCEPT_FUNCTION(pthread_create);
1563 INTERCEPT_FUNCTION(pthread_key_create);
1564 INTERCEPT_FUNCTION(pthread_join);
1565 INTERCEPT_FUNCTION(tzset);
1566 INTERCEPT_FUNCTION(__cxa_atexit);
1567 INTERCEPT_FUNCTION(shmat);
1568 INTERCEPT_FUNCTION(fork);
1569 INTERCEPT_FUNCTION(openpty);
1570 INTERCEPT_FUNCTION(forkpty);
1574 } // namespace __msan