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_platform_limits_netbsd.h"
26 #include "sanitizer_common/sanitizer_allocator.h"
27 #include "sanitizer_common/sanitizer_allocator_interface.h"
28 #include "sanitizer_common/sanitizer_allocator_internal.h"
29 #include "sanitizer_common/sanitizer_atomic.h"
30 #include "sanitizer_common/sanitizer_common.h"
31 #include "sanitizer_common/sanitizer_errno.h"
32 #include "sanitizer_common/sanitizer_stackdepot.h"
33 #include "sanitizer_common/sanitizer_libc.h"
34 #include "sanitizer_common/sanitizer_linux.h"
35 #include "sanitizer_common/sanitizer_tls_get_addr.h"
38 #define gettimeofday __gettimeofday50
39 #define getrusage __getrusage50
43 // ACHTUNG! No other system header includes in this file.
44 // Ideally, we should get rid of stdarg.h as well.
46 using namespace __msan;
48 using __sanitizer::memory_order;
49 using __sanitizer::atomic_load;
50 using __sanitizer::atomic_store;
51 using __sanitizer::atomic_uintptr_t;
53 DECLARE_REAL(SIZE_T, strlen, const char *s)
54 DECLARE_REAL(SIZE_T, strnlen, const char *s, SIZE_T maxlen)
55 DECLARE_REAL(void *, memcpy, void *dest, const void *src, uptr n)
56 DECLARE_REAL(void *, memset, void *dest, int c, uptr n)
58 // True if this is a nested interceptor.
59 static THREADLOCAL int in_interceptor_scope;
61 struct InterceptorScope {
62 InterceptorScope() { ++in_interceptor_scope; }
63 ~InterceptorScope() { --in_interceptor_scope; }
66 bool IsInInterceptorScope() {
67 return in_interceptor_scope;
70 static uptr allocated_for_dlsym;
71 static const uptr kDlsymAllocPoolSize = 1024;
72 static uptr alloc_memory_for_dlsym[kDlsymAllocPoolSize];
74 static bool IsInDlsymAllocPool(const void *ptr) {
75 uptr off = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
76 return off < sizeof(alloc_memory_for_dlsym);
79 static void *AllocateFromLocalPool(uptr size_in_bytes) {
80 uptr size_in_words = RoundUpTo(size_in_bytes, kWordSize) / kWordSize;
81 void *mem = (void *)&alloc_memory_for_dlsym[allocated_for_dlsym];
82 allocated_for_dlsym += size_in_words;
83 CHECK_LT(allocated_for_dlsym, kDlsymAllocPoolSize);
87 #define ENSURE_MSAN_INITED() do { \
88 CHECK(!msan_init_is_running); \
94 // Check that [x, x+n) range is unpoisoned.
95 #define CHECK_UNPOISONED_0(x, n) \
97 sptr __offset = __msan_test_shadow(x, n); \
98 if (__msan::IsInSymbolizer()) break; \
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 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
127 INTERCEPTOR(SIZE_T, fread_unlocked, void *ptr, SIZE_T size, SIZE_T nmemb,
129 ENSURE_MSAN_INITED();
130 SIZE_T res = REAL(fread_unlocked)(ptr, size, nmemb, file);
132 __msan_unpoison(ptr, res *size);
135 #define MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED INTERCEPT_FUNCTION(fread_unlocked)
137 #define MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED
140 INTERCEPTOR(SSIZE_T, readlink, const char *path, char *buf, SIZE_T bufsiz) {
141 ENSURE_MSAN_INITED();
142 CHECK_UNPOISONED_STRING(path, 0);
143 SSIZE_T res = REAL(readlink)(path, buf, bufsiz);
145 __msan_unpoison(buf, res);
149 #if !SANITIZER_NETBSD
150 INTERCEPTOR(void *, mempcpy, void *dest, const void *src, SIZE_T n) {
151 return (char *)__msan_memcpy(dest, src, n) + n;
153 #define MSAN_MAYBE_INTERCEPT_MEMPCPY INTERCEPT_FUNCTION(mempcpy)
155 #define MSAN_MAYBE_INTERCEPT_MEMPCPY
158 INTERCEPTOR(void *, memccpy, void *dest, const void *src, int c, SIZE_T n) {
159 ENSURE_MSAN_INITED();
160 void *res = REAL(memccpy)(dest, src, c, n);
161 CHECK(!res || (res >= dest && res <= (char *)dest + n));
162 SIZE_T sz = res ? (char *)res - (char *)dest : n;
163 CHECK_UNPOISONED(src, sz);
164 __msan_unpoison(dest, sz);
168 INTERCEPTOR(void *, bcopy, const void *src, void *dest, SIZE_T n) {
169 return __msan_memmove(dest, src, n);
172 INTERCEPTOR(int, posix_memalign, void **memptr, SIZE_T alignment, SIZE_T size) {
173 GET_MALLOC_STACK_TRACE;
175 int res = msan_posix_memalign(memptr, alignment, size, &stack);
177 __msan_unpoison(memptr, sizeof(*memptr));
181 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
182 INTERCEPTOR(void *, memalign, SIZE_T alignment, SIZE_T size) {
183 GET_MALLOC_STACK_TRACE;
184 return msan_memalign(alignment, size, &stack);
186 #define MSAN_MAYBE_INTERCEPT_MEMALIGN INTERCEPT_FUNCTION(memalign)
188 #define MSAN_MAYBE_INTERCEPT_MEMALIGN
191 INTERCEPTOR(void *, aligned_alloc, SIZE_T alignment, SIZE_T size) {
192 GET_MALLOC_STACK_TRACE;
193 return msan_aligned_alloc(alignment, size, &stack);
196 #if !SANITIZER_NETBSD
197 INTERCEPTOR(void *, __libc_memalign, SIZE_T alignment, SIZE_T size) {
198 GET_MALLOC_STACK_TRACE;
199 void *ptr = msan_memalign(alignment, size, &stack);
201 DTLS_on_libc_memalign(ptr, size);
204 #define MSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN INTERCEPT_FUNCTION(__libc_memalign)
206 #define MSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN
209 INTERCEPTOR(void *, valloc, SIZE_T size) {
210 GET_MALLOC_STACK_TRACE;
211 return msan_valloc(size, &stack);
214 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
215 INTERCEPTOR(void *, pvalloc, SIZE_T size) {
216 GET_MALLOC_STACK_TRACE;
217 return msan_pvalloc(size, &stack);
219 #define MSAN_MAYBE_INTERCEPT_PVALLOC INTERCEPT_FUNCTION(pvalloc)
221 #define MSAN_MAYBE_INTERCEPT_PVALLOC
224 INTERCEPTOR(void, free, void *ptr) {
225 GET_MALLOC_STACK_TRACE;
226 if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
227 MsanDeallocate(&stack, ptr);
230 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
231 INTERCEPTOR(void, cfree, void *ptr) {
232 GET_MALLOC_STACK_TRACE;
233 if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
234 MsanDeallocate(&stack, ptr);
236 #define MSAN_MAYBE_INTERCEPT_CFREE INTERCEPT_FUNCTION(cfree)
238 #define MSAN_MAYBE_INTERCEPT_CFREE
241 #if !SANITIZER_NETBSD
242 INTERCEPTOR(uptr, malloc_usable_size, void *ptr) {
243 return __sanitizer_get_allocated_size(ptr);
245 #define MSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE \
246 INTERCEPT_FUNCTION(malloc_usable_size)
248 #define MSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE
251 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
252 // This function actually returns a struct by value, but we can't unpoison a
253 // temporary! The following is equivalent on all supported platforms but
254 // aarch64 (which uses a different register for sret value). We have a test
256 INTERCEPTOR(void, mallinfo, __sanitizer_mallinfo *sret) {
259 asm volatile("mov %0,x8" : "=r" (r8));
260 sret = reinterpret_cast<__sanitizer_mallinfo*>(r8);
262 REAL(memset)(sret, 0, sizeof(*sret));
263 __msan_unpoison(sret, sizeof(*sret));
265 #define MSAN_MAYBE_INTERCEPT_MALLINFO INTERCEPT_FUNCTION(mallinfo)
267 #define MSAN_MAYBE_INTERCEPT_MALLINFO
270 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
271 INTERCEPTOR(int, mallopt, int cmd, int value) {
274 #define MSAN_MAYBE_INTERCEPT_MALLOPT INTERCEPT_FUNCTION(mallopt)
276 #define MSAN_MAYBE_INTERCEPT_MALLOPT
279 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
280 INTERCEPTOR(void, malloc_stats, void) {
281 // FIXME: implement, but don't call REAL(malloc_stats)!
283 #define MSAN_MAYBE_INTERCEPT_MALLOC_STATS INTERCEPT_FUNCTION(malloc_stats)
285 #define MSAN_MAYBE_INTERCEPT_MALLOC_STATS
288 INTERCEPTOR(char *, strcpy, char *dest, const char *src) { // NOLINT
289 ENSURE_MSAN_INITED();
290 GET_STORE_STACK_TRACE;
291 SIZE_T n = REAL(strlen)(src);
292 CHECK_UNPOISONED_STRING(src + n, 0);
293 char *res = REAL(strcpy)(dest, src); // NOLINT
294 CopyShadowAndOrigin(dest, src, n + 1, &stack);
298 INTERCEPTOR(char *, strncpy, char *dest, const char *src, SIZE_T n) { // NOLINT
299 ENSURE_MSAN_INITED();
300 GET_STORE_STACK_TRACE;
301 SIZE_T copy_size = REAL(strnlen)(src, n);
303 copy_size++; // trailing \0
304 char *res = REAL(strncpy)(dest, src, n); // NOLINT
305 CopyShadowAndOrigin(dest, src, copy_size, &stack);
306 __msan_unpoison(dest + copy_size, n - copy_size);
310 #if !SANITIZER_NETBSD
311 INTERCEPTOR(char *, stpcpy, char *dest, const char *src) { // NOLINT
312 ENSURE_MSAN_INITED();
313 GET_STORE_STACK_TRACE;
314 SIZE_T n = REAL(strlen)(src);
315 CHECK_UNPOISONED_STRING(src + n, 0);
316 char *res = REAL(stpcpy)(dest, src); // NOLINT
317 CopyShadowAndOrigin(dest, src, n + 1, &stack);
320 #define MSAN_MAYBE_INTERCEPT_STPCPY INTERCEPT_FUNCTION(stpcpy)
322 #define MSAN_MAYBE_INTERCEPT_STPCPY
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 && !SANITIZER_NETBSD
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 #if !SANITIZER_NETBSD
353 INTERCEPTOR(char *, gcvt, double number, SIZE_T ndigit, char *buf) {
354 ENSURE_MSAN_INITED();
355 char *res = REAL(gcvt)(number, ndigit, buf);
356 SIZE_T n = REAL(strlen)(buf);
357 __msan_unpoison(buf, n + 1);
360 #define MSAN_MAYBE_INTERCEPT_GCVT INTERCEPT_FUNCTION(gcvt)
362 #define MSAN_MAYBE_INTERCEPT_GCVT
365 INTERCEPTOR(char *, strcat, char *dest, const char *src) { // NOLINT
366 ENSURE_MSAN_INITED();
367 GET_STORE_STACK_TRACE;
368 SIZE_T src_size = REAL(strlen)(src);
369 SIZE_T dest_size = REAL(strlen)(dest);
370 CHECK_UNPOISONED_STRING(src + src_size, 0);
371 CHECK_UNPOISONED_STRING(dest + dest_size, 0);
372 char *res = REAL(strcat)(dest, src); // NOLINT
373 CopyShadowAndOrigin(dest + dest_size, src, src_size + 1, &stack);
377 INTERCEPTOR(char *, strncat, char *dest, const char *src, SIZE_T n) { // NOLINT
378 ENSURE_MSAN_INITED();
379 GET_STORE_STACK_TRACE;
380 SIZE_T dest_size = REAL(strlen)(dest);
381 SIZE_T copy_size = REAL(strnlen)(src, n);
382 CHECK_UNPOISONED_STRING(dest + dest_size, 0);
383 char *res = REAL(strncat)(dest, src, n); // NOLINT
384 CopyShadowAndOrigin(dest + dest_size, src, copy_size, &stack);
385 __msan_unpoison(dest + dest_size + copy_size, 1); // \0
389 // Hack: always pass nptr and endptr as part of __VA_ARGS_ to avoid having to
390 // deal with empty __VA_ARGS__ in the case of INTERCEPTOR_STRTO.
391 #define INTERCEPTOR_STRTO_BODY(ret_type, func, ...) \
392 ENSURE_MSAN_INITED(); \
393 ret_type res = REAL(func)(__VA_ARGS__); \
394 __msan_unpoison(endptr, sizeof(*endptr)); \
397 #define INTERCEPTOR_STRTO(ret_type, func, char_type) \
398 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr) { \
399 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr); \
402 #define INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
403 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
405 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base); \
408 #define INTERCEPTOR_STRTO_LOC(ret_type, func, char_type) \
409 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
411 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, loc); \
414 #define INTERCEPTOR_STRTO_BASE_LOC(ret_type, func, char_type) \
415 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
416 int base, void *loc) { \
417 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base, loc); \
421 #define INTERCEPTORS_STRTO(ret_type, func, char_type) \
422 INTERCEPTOR_STRTO(ret_type, func, char_type) \
423 INTERCEPTOR_STRTO_LOC(ret_type, func##_l, char_type)
425 #define INTERCEPTORS_STRTO_BASE(ret_type, func, char_type) \
426 INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
427 INTERCEPTOR_STRTO_BASE_LOC(ret_type, func##_l, char_type)
430 #define INTERCEPTORS_STRTO(ret_type, func, char_type) \
431 INTERCEPTOR_STRTO(ret_type, func, char_type) \
432 INTERCEPTOR_STRTO_LOC(ret_type, func##_l, char_type) \
433 INTERCEPTOR_STRTO_LOC(ret_type, __##func##_l, char_type) \
434 INTERCEPTOR_STRTO_LOC(ret_type, __##func##_internal, char_type)
436 #define INTERCEPTORS_STRTO_BASE(ret_type, func, char_type) \
437 INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
438 INTERCEPTOR_STRTO_BASE_LOC(ret_type, func##_l, char_type) \
439 INTERCEPTOR_STRTO_BASE_LOC(ret_type, __##func##_l, char_type) \
440 INTERCEPTOR_STRTO_BASE_LOC(ret_type, __##func##_internal, char_type)
443 INTERCEPTORS_STRTO(double, strtod, char) // NOLINT
444 INTERCEPTORS_STRTO(float, strtof, char) // NOLINT
445 INTERCEPTORS_STRTO(long double, strtold, char) // NOLINT
446 INTERCEPTORS_STRTO_BASE(long, strtol, char) // NOLINT
447 INTERCEPTORS_STRTO_BASE(long long, strtoll, char) // NOLINT
448 INTERCEPTORS_STRTO_BASE(unsigned long, strtoul, char) // NOLINT
449 INTERCEPTORS_STRTO_BASE(unsigned long long, strtoull, char) // NOLINT
450 INTERCEPTORS_STRTO_BASE(u64, strtouq, char) // NOLINT
452 INTERCEPTORS_STRTO(double, wcstod, wchar_t) // NOLINT
453 INTERCEPTORS_STRTO(float, wcstof, wchar_t) // NOLINT
454 INTERCEPTORS_STRTO(long double, wcstold, wchar_t) // NOLINT
455 INTERCEPTORS_STRTO_BASE(long, wcstol, wchar_t) // NOLINT
456 INTERCEPTORS_STRTO_BASE(long long, wcstoll, wchar_t) // NOLINT
457 INTERCEPTORS_STRTO_BASE(unsigned long, wcstoul, wchar_t) // NOLINT
458 INTERCEPTORS_STRTO_BASE(unsigned long long, wcstoull, wchar_t) // NOLINT
461 #define INTERCEPT_STRTO(func) \
462 INTERCEPT_FUNCTION(func); \
463 INTERCEPT_FUNCTION(func##_l);
465 #define INTERCEPT_STRTO(func) \
466 INTERCEPT_FUNCTION(func); \
467 INTERCEPT_FUNCTION(func##_l); \
468 INTERCEPT_FUNCTION(__##func##_l); \
469 INTERCEPT_FUNCTION(__##func##_internal);
473 // FIXME: support *wprintf in common format interceptors.
474 INTERCEPTOR(int, vswprintf, void *str, uptr size, void *format, va_list ap) {
475 ENSURE_MSAN_INITED();
476 int res = REAL(vswprintf)(str, size, format, ap);
478 __msan_unpoison(str, 4 * (res + 1));
483 INTERCEPTOR(int, swprintf, void *str, uptr size, void *format, ...) {
484 ENSURE_MSAN_INITED();
486 va_start(ap, format);
487 int res = vswprintf(str, size, format, ap);
492 INTERCEPTOR(SIZE_T, strxfrm, char *dest, const char *src, SIZE_T n) {
493 ENSURE_MSAN_INITED();
494 CHECK_UNPOISONED(src, REAL(strlen)(src) + 1);
495 SIZE_T res = REAL(strxfrm)(dest, src, n);
496 if (res < n) __msan_unpoison(dest, res + 1);
500 INTERCEPTOR(SIZE_T, strxfrm_l, char *dest, const char *src, SIZE_T n,
502 ENSURE_MSAN_INITED();
503 CHECK_UNPOISONED(src, REAL(strlen)(src) + 1);
504 SIZE_T res = REAL(strxfrm_l)(dest, src, n, loc);
505 if (res < n) __msan_unpoison(dest, res + 1);
510 INTERCEPTOR(SIZE_T, __strxfrm_l, char *dest, const char *src, SIZE_T n,
512 ENSURE_MSAN_INITED();
513 CHECK_UNPOISONED(src, REAL(strlen)(src) + 1);
514 SIZE_T res = REAL(__strxfrm_l)(dest, src, n, loc);
515 if (res < n) __msan_unpoison(dest, res + 1);
518 #define MSAN_MAYBE_INTERCEPT___STRXFRM_L INTERCEPT_FUNCTION(__strxfrm_l)
520 #define MSAN_MAYBE_INTERCEPT___STRXFRM_L
523 #define INTERCEPTOR_STRFTIME_BODY(char_type, ret_type, func, s, ...) \
524 ENSURE_MSAN_INITED(); \
525 ret_type res = REAL(func)(s, __VA_ARGS__); \
526 if (s) __msan_unpoison(s, sizeof(char_type) * (res + 1)); \
529 INTERCEPTOR(SIZE_T, strftime, char *s, SIZE_T max, const char *format,
530 __sanitizer_tm *tm) {
531 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, strftime, s, max, format, tm);
534 INTERCEPTOR(SIZE_T, strftime_l, char *s, SIZE_T max, const char *format,
535 __sanitizer_tm *tm, void *loc) {
536 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, strftime_l, s, max, format, tm, loc);
539 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
540 INTERCEPTOR(SIZE_T, __strftime_l, char *s, SIZE_T max, const char *format,
541 __sanitizer_tm *tm, void *loc) {
542 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, __strftime_l, s, max, format, tm,
545 #define MSAN_MAYBE_INTERCEPT___STRFTIME_L INTERCEPT_FUNCTION(__strftime_l)
547 #define MSAN_MAYBE_INTERCEPT___STRFTIME_L
550 INTERCEPTOR(SIZE_T, wcsftime, wchar_t *s, SIZE_T max, const wchar_t *format,
551 __sanitizer_tm *tm) {
552 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, wcsftime, s, max, format, tm);
555 INTERCEPTOR(SIZE_T, wcsftime_l, wchar_t *s, SIZE_T max, const wchar_t *format,
556 __sanitizer_tm *tm, void *loc) {
557 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, wcsftime_l, s, max, format, tm,
561 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
562 INTERCEPTOR(SIZE_T, __wcsftime_l, wchar_t *s, SIZE_T max, const wchar_t *format,
563 __sanitizer_tm *tm, void *loc) {
564 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, __wcsftime_l, s, max, format, tm,
567 #define MSAN_MAYBE_INTERCEPT___WCSFTIME_L INTERCEPT_FUNCTION(__wcsftime_l)
569 #define MSAN_MAYBE_INTERCEPT___WCSFTIME_L
572 INTERCEPTOR(int, mbtowc, wchar_t *dest, const char *src, SIZE_T n) {
573 ENSURE_MSAN_INITED();
574 int res = REAL(mbtowc)(dest, src, n);
575 if (res != -1 && dest) __msan_unpoison(dest, sizeof(wchar_t));
579 INTERCEPTOR(SIZE_T, mbrtowc, wchar_t *dest, const char *src, SIZE_T n,
581 ENSURE_MSAN_INITED();
582 SIZE_T res = REAL(mbrtowc)(dest, src, n, ps);
583 if (res != (SIZE_T)-1 && dest) __msan_unpoison(dest, sizeof(wchar_t));
587 // wchar_t *wmemcpy(wchar_t *dest, const wchar_t *src, SIZE_T n);
588 INTERCEPTOR(wchar_t *, wmemcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
589 ENSURE_MSAN_INITED();
590 GET_STORE_STACK_TRACE;
591 wchar_t *res = REAL(wmemcpy)(dest, src, n);
592 CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
596 #if !SANITIZER_NETBSD
597 INTERCEPTOR(wchar_t *, wmempcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
598 ENSURE_MSAN_INITED();
599 GET_STORE_STACK_TRACE;
600 wchar_t *res = REAL(wmempcpy)(dest, src, n);
601 CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
604 #define MSAN_MAYBE_INTERCEPT_WMEMPCPY INTERCEPT_FUNCTION(wmempcpy)
606 #define MSAN_MAYBE_INTERCEPT_WMEMPCPY
609 INTERCEPTOR(wchar_t *, wmemset, wchar_t *s, wchar_t c, SIZE_T n) {
610 CHECK(MEM_IS_APP(s));
611 ENSURE_MSAN_INITED();
612 wchar_t *res = REAL(wmemset)(s, c, n);
613 __msan_unpoison(s, n * sizeof(wchar_t));
617 INTERCEPTOR(wchar_t *, wmemmove, wchar_t *dest, const wchar_t *src, SIZE_T n) {
618 ENSURE_MSAN_INITED();
619 GET_STORE_STACK_TRACE;
620 wchar_t *res = REAL(wmemmove)(dest, src, n);
621 MoveShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
625 INTERCEPTOR(int, wcscmp, const wchar_t *s1, const wchar_t *s2) {
626 ENSURE_MSAN_INITED();
627 int res = REAL(wcscmp)(s1, s2);
631 INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
632 ENSURE_MSAN_INITED();
633 int res = REAL(gettimeofday)(tv, tz);
635 __msan_unpoison(tv, 16);
637 __msan_unpoison(tz, 8);
641 #if !SANITIZER_NETBSD
642 INTERCEPTOR(char *, fcvt, double x, int a, int *b, int *c) {
643 ENSURE_MSAN_INITED();
644 char *res = REAL(fcvt)(x, a, b, c);
645 __msan_unpoison(b, sizeof(*b));
646 __msan_unpoison(c, sizeof(*c));
647 if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
650 #define MSAN_MAYBE_INTERCEPT_FCVT INTERCEPT_FUNCTION(fcvt)
652 #define MSAN_MAYBE_INTERCEPT_FCVT
655 INTERCEPTOR(char *, getenv, char *name) {
656 if (msan_init_is_running)
657 return REAL(getenv)(name);
658 ENSURE_MSAN_INITED();
659 char *res = REAL(getenv)(name);
660 if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
664 extern char **environ;
666 static void UnpoisonEnviron() {
667 char **envp = environ;
668 for (; *envp; ++envp) {
669 __msan_unpoison(envp, sizeof(*envp));
670 __msan_unpoison(*envp, REAL(strlen)(*envp) + 1);
672 // Trailing NULL pointer.
673 __msan_unpoison(envp, sizeof(*envp));
676 INTERCEPTOR(int, setenv, const char *name, const char *value, int overwrite) {
677 ENSURE_MSAN_INITED();
678 CHECK_UNPOISONED_STRING(name, 0);
679 int res = REAL(setenv)(name, value, overwrite);
680 if (!res) UnpoisonEnviron();
684 INTERCEPTOR(int, putenv, char *string) {
685 ENSURE_MSAN_INITED();
686 int res = REAL(putenv)(string);
687 if (!res) UnpoisonEnviron();
691 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
692 INTERCEPTOR(int, __fxstat, int magic, int fd, void *buf) {
693 ENSURE_MSAN_INITED();
694 int res = REAL(__fxstat)(magic, fd, buf);
696 __msan_unpoison(buf, __sanitizer::struct_stat_sz);
699 #define MSAN_MAYBE_INTERCEPT___FXSTAT INTERCEPT_FUNCTION(__fxstat)
701 #define MSAN_MAYBE_INTERCEPT___FXSTAT
704 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
705 INTERCEPTOR(int, __fxstat64, int magic, int fd, void *buf) {
706 ENSURE_MSAN_INITED();
707 int res = REAL(__fxstat64)(magic, fd, buf);
709 __msan_unpoison(buf, __sanitizer::struct_stat64_sz);
712 #define MSAN_MAYBE_INTERCEPT___FXSTAT64 INTERCEPT_FUNCTION(__fxstat64)
714 #define MSAN_MAYBE_INTERCEPT___FXSTAT64
717 #if SANITIZER_FREEBSD || SANITIZER_NETBSD
718 INTERCEPTOR(int, fstatat, int fd, char *pathname, void *buf, int flags) {
719 ENSURE_MSAN_INITED();
720 int res = REAL(fstatat)(fd, pathname, buf, flags);
721 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz);
724 # define MSAN_INTERCEPT_FSTATAT INTERCEPT_FUNCTION(fstatat)
726 INTERCEPTOR(int, __fxstatat, int magic, int fd, char *pathname, void *buf,
728 ENSURE_MSAN_INITED();
729 int res = REAL(__fxstatat)(magic, fd, pathname, buf, flags);
730 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz);
733 # define MSAN_INTERCEPT_FSTATAT INTERCEPT_FUNCTION(__fxstatat)
736 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
737 INTERCEPTOR(int, __fxstatat64, int magic, int fd, char *pathname, void *buf,
739 ENSURE_MSAN_INITED();
740 int res = REAL(__fxstatat64)(magic, fd, pathname, buf, flags);
741 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat64_sz);
744 #define MSAN_MAYBE_INTERCEPT___FXSTATAT64 INTERCEPT_FUNCTION(__fxstatat64)
746 #define MSAN_MAYBE_INTERCEPT___FXSTATAT64
749 INTERCEPTOR(int, pipe, int pipefd[2]) {
750 if (msan_init_is_running)
751 return REAL(pipe)(pipefd);
752 ENSURE_MSAN_INITED();
753 int res = REAL(pipe)(pipefd);
755 __msan_unpoison(pipefd, sizeof(int[2]));
759 INTERCEPTOR(int, pipe2, int pipefd[2], int flags) {
760 ENSURE_MSAN_INITED();
761 int res = REAL(pipe2)(pipefd, flags);
763 __msan_unpoison(pipefd, sizeof(int[2]));
767 INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int sv[2]) {
768 ENSURE_MSAN_INITED();
769 int res = REAL(socketpair)(domain, type, protocol, sv);
771 __msan_unpoison(sv, sizeof(int[2]));
775 INTERCEPTOR(char *, fgets, char *s, int size, void *stream) {
776 ENSURE_MSAN_INITED();
777 char *res = REAL(fgets)(s, size, stream);
779 __msan_unpoison(s, REAL(strlen)(s) + 1);
783 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
784 INTERCEPTOR(char *, fgets_unlocked, char *s, int size, void *stream) {
785 ENSURE_MSAN_INITED();
786 char *res = REAL(fgets_unlocked)(s, size, stream);
788 __msan_unpoison(s, REAL(strlen)(s) + 1);
791 #define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED INTERCEPT_FUNCTION(fgets_unlocked)
793 #define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED
796 INTERCEPTOR(int, getrlimit, int resource, void *rlim) {
797 if (msan_init_is_running)
798 return REAL(getrlimit)(resource, rlim);
799 ENSURE_MSAN_INITED();
800 int res = REAL(getrlimit)(resource, rlim);
802 __msan_unpoison(rlim, __sanitizer::struct_rlimit_sz);
806 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
807 INTERCEPTOR(int, getrlimit64, int resource, void *rlim) {
808 if (msan_init_is_running) return REAL(getrlimit64)(resource, rlim);
809 ENSURE_MSAN_INITED();
810 int res = REAL(getrlimit64)(resource, rlim);
811 if (!res) __msan_unpoison(rlim, __sanitizer::struct_rlimit64_sz);
815 INTERCEPTOR(int, prlimit, int pid, int resource, void *new_rlimit,
817 if (msan_init_is_running)
818 return REAL(prlimit)(pid, resource, new_rlimit, old_rlimit);
819 ENSURE_MSAN_INITED();
820 CHECK_UNPOISONED(new_rlimit, __sanitizer::struct_rlimit_sz);
821 int res = REAL(prlimit)(pid, resource, new_rlimit, old_rlimit);
822 if (!res) __msan_unpoison(old_rlimit, __sanitizer::struct_rlimit_sz);
826 INTERCEPTOR(int, prlimit64, int pid, int resource, void *new_rlimit,
828 if (msan_init_is_running)
829 return REAL(prlimit64)(pid, resource, new_rlimit, old_rlimit);
830 ENSURE_MSAN_INITED();
831 CHECK_UNPOISONED(new_rlimit, __sanitizer::struct_rlimit64_sz);
832 int res = REAL(prlimit64)(pid, resource, new_rlimit, old_rlimit);
833 if (!res) __msan_unpoison(old_rlimit, __sanitizer::struct_rlimit64_sz);
837 #define MSAN_MAYBE_INTERCEPT_GETRLIMIT64 INTERCEPT_FUNCTION(getrlimit64)
838 #define MSAN_MAYBE_INTERCEPT_PRLIMIT INTERCEPT_FUNCTION(prlimit)
839 #define MSAN_MAYBE_INTERCEPT_PRLIMIT64 INTERCEPT_FUNCTION(prlimit64)
841 #define MSAN_MAYBE_INTERCEPT_GETRLIMIT64
842 #define MSAN_MAYBE_INTERCEPT_PRLIMIT
843 #define MSAN_MAYBE_INTERCEPT_PRLIMIT64
846 #if SANITIZER_FREEBSD
847 // FreeBSD's <sys/utsname.h> define uname() as
848 // static __inline int uname(struct utsname *name) {
849 // return __xuname(SYS_NMLN, (void*)name);
851 INTERCEPTOR(int, __xuname, int size, void *utsname) {
852 ENSURE_MSAN_INITED();
853 int res = REAL(__xuname)(size, utsname);
855 __msan_unpoison(utsname, __sanitizer::struct_utsname_sz);
858 #define MSAN_INTERCEPT_UNAME INTERCEPT_FUNCTION(__xuname)
860 INTERCEPTOR(int, uname, struct utsname *utsname) {
861 ENSURE_MSAN_INITED();
862 int res = REAL(uname)(utsname);
864 __msan_unpoison(utsname, __sanitizer::struct_utsname_sz);
867 #define MSAN_INTERCEPT_UNAME INTERCEPT_FUNCTION(uname)
870 INTERCEPTOR(int, gethostname, char *name, SIZE_T len) {
871 ENSURE_MSAN_INITED();
872 int res = REAL(gethostname)(name, len);
874 SIZE_T real_len = REAL(strnlen)(name, len);
877 __msan_unpoison(name, real_len);
882 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
883 INTERCEPTOR(int, epoll_wait, int epfd, void *events, int maxevents,
885 ENSURE_MSAN_INITED();
886 int res = REAL(epoll_wait)(epfd, events, maxevents, timeout);
888 __msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res);
892 #define MSAN_MAYBE_INTERCEPT_EPOLL_WAIT INTERCEPT_FUNCTION(epoll_wait)
894 #define MSAN_MAYBE_INTERCEPT_EPOLL_WAIT
897 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
898 INTERCEPTOR(int, epoll_pwait, int epfd, void *events, int maxevents,
899 int timeout, void *sigmask) {
900 ENSURE_MSAN_INITED();
901 int res = REAL(epoll_pwait)(epfd, events, maxevents, timeout, sigmask);
903 __msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res);
907 #define MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT INTERCEPT_FUNCTION(epoll_pwait)
909 #define MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT
912 INTERCEPTOR(void *, calloc, SIZE_T nmemb, SIZE_T size) {
913 GET_MALLOC_STACK_TRACE;
914 if (UNLIKELY(!msan_inited))
915 // Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym.
916 return AllocateFromLocalPool(nmemb * size);
917 return msan_calloc(nmemb, size, &stack);
920 INTERCEPTOR(void *, realloc, void *ptr, SIZE_T size) {
921 GET_MALLOC_STACK_TRACE;
922 if (UNLIKELY(IsInDlsymAllocPool(ptr))) {
923 uptr offset = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
924 uptr copy_size = Min(size, kDlsymAllocPoolSize - offset);
926 if (UNLIKELY(!msan_inited)) {
927 new_ptr = AllocateFromLocalPool(copy_size);
930 new_ptr = msan_malloc(copy_size, &stack);
932 internal_memcpy(new_ptr, ptr, copy_size);
935 return msan_realloc(ptr, size, &stack);
938 INTERCEPTOR(void *, malloc, SIZE_T size) {
939 GET_MALLOC_STACK_TRACE;
940 if (UNLIKELY(!msan_inited))
941 // Hack: dlsym calls malloc before REAL(malloc) is retrieved from dlsym.
942 return AllocateFromLocalPool(size);
943 return msan_malloc(size, &stack);
946 void __msan_allocated_memory(const void *data, uptr size) {
947 GET_MALLOC_STACK_TRACE;
948 if (flags()->poison_in_malloc) {
949 stack.tag = STACK_TRACE_TAG_POISON;
950 PoisonMemory(data, size, &stack);
954 void __msan_copy_shadow(void *dest, const void *src, uptr n) {
955 GET_STORE_STACK_TRACE;
956 MoveShadowAndOrigin(dest, src, n, &stack);
959 void __sanitizer_dtor_callback(const void *data, uptr size) {
960 GET_MALLOC_STACK_TRACE;
961 if (flags()->poison_in_dtor) {
962 stack.tag = STACK_TRACE_TAG_POISON;
963 PoisonMemory(data, size, &stack);
967 INTERCEPTOR(void *, mmap, void *addr, SIZE_T length, int prot, int flags,
968 int fd, OFF_T offset) {
969 if (msan_init_is_running)
970 return REAL(mmap)(addr, length, prot, flags, fd, offset);
971 ENSURE_MSAN_INITED();
972 if (addr && !MEM_IS_APP(addr)) {
973 if (flags & map_fixed) {
974 errno = errno_EINVAL;
980 void *res = REAL(mmap)(addr, length, prot, flags, fd, offset);
981 if (res != (void*)-1)
982 __msan_unpoison(res, RoundUpTo(length, GetPageSize()));
986 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
987 INTERCEPTOR(void *, mmap64, void *addr, SIZE_T length, int prot, int flags,
988 int fd, OFF64_T offset) {
989 ENSURE_MSAN_INITED();
990 if (addr && !MEM_IS_APP(addr)) {
991 if (flags & map_fixed) {
992 errno = errno_EINVAL;
998 void *res = REAL(mmap64)(addr, length, prot, flags, fd, offset);
999 if (res != (void*)-1)
1000 __msan_unpoison(res, RoundUpTo(length, GetPageSize()));
1003 #define MSAN_MAYBE_INTERCEPT_MMAP64 INTERCEPT_FUNCTION(mmap64)
1005 #define MSAN_MAYBE_INTERCEPT_MMAP64
1008 INTERCEPTOR(int, getrusage, int who, void *usage) {
1009 ENSURE_MSAN_INITED();
1010 int res = REAL(getrusage)(who, usage);
1012 __msan_unpoison(usage, __sanitizer::struct_rusage_sz);
1017 class SignalHandlerScope {
1019 SignalHandlerScope() {
1020 if (MsanThread *t = GetCurrentThread())
1021 t->EnterSignalHandler();
1023 ~SignalHandlerScope() {
1024 if (MsanThread *t = GetCurrentThread())
1025 t->LeaveSignalHandler();
1029 // sigactions_mu guarantees atomicity of sigaction() and signal() calls.
1030 // Access to sigactions[] is gone with relaxed atomics to avoid data race with
1031 // the signal handler.
1032 const int kMaxSignals = 1024;
1033 static atomic_uintptr_t sigactions[kMaxSignals];
1034 static StaticSpinMutex sigactions_mu;
1036 static void SignalHandler(int signo) {
1037 SignalHandlerScope signal_handler_scope;
1038 ScopedThreadLocalStateBackup stlsb;
1041 typedef void (*signal_cb)(int x);
1043 (signal_cb)atomic_load(&sigactions[signo], memory_order_relaxed);
1047 static void SignalAction(int signo, void *si, void *uc) {
1048 SignalHandlerScope signal_handler_scope;
1049 ScopedThreadLocalStateBackup stlsb;
1051 __msan_unpoison(si, sizeof(__sanitizer_sigaction));
1052 __msan_unpoison(uc, __sanitizer::ucontext_t_sz);
1054 typedef void (*sigaction_cb)(int, void *, void *);
1056 (sigaction_cb)atomic_load(&sigactions[signo], memory_order_relaxed);
1060 static void read_sigaction(const __sanitizer_sigaction *act) {
1061 CHECK_UNPOISONED(&act->sa_flags, sizeof(act->sa_flags));
1062 if (act->sa_flags & __sanitizer::sa_siginfo)
1063 CHECK_UNPOISONED(&act->sigaction, sizeof(act->sigaction));
1065 CHECK_UNPOISONED(&act->handler, sizeof(act->handler));
1066 CHECK_UNPOISONED(&act->sa_mask, sizeof(act->sa_mask));
1069 extern "C" int pthread_attr_init(void *attr);
1070 extern "C" int pthread_attr_destroy(void *attr);
1072 static void *MsanThreadStartFunc(void *arg) {
1073 MsanThread *t = (MsanThread *)arg;
1074 SetCurrentThread(t);
1075 return t->ThreadStart();
1078 INTERCEPTOR(int, pthread_create, void *th, void *attr, void *(*callback)(void*),
1080 ENSURE_MSAN_INITED(); // for GetTlsSize()
1081 __sanitizer_pthread_attr_t myattr;
1083 pthread_attr_init(&myattr);
1087 AdjustStackSize(attr);
1089 MsanThread *t = MsanThread::Create(callback, param);
1091 int res = REAL(pthread_create)(th, attr, MsanThreadStartFunc, t);
1093 if (attr == &myattr)
1094 pthread_attr_destroy(&myattr);
1096 __msan_unpoison(th, __sanitizer::pthread_t_sz);
1101 INTERCEPTOR(int, pthread_key_create, __sanitizer_pthread_key_t *key,
1102 void (*dtor)(void *value)) {
1103 if (msan_init_is_running) return REAL(pthread_key_create)(key, dtor);
1104 ENSURE_MSAN_INITED();
1105 int res = REAL(pthread_key_create)(key, dtor);
1107 __msan_unpoison(key, sizeof(*key));
1111 #if SANITIZER_NETBSD
1112 INTERCEPTOR(void, __libc_thr_keycreate, void *m, void (*dtor)(void *value)) \
1113 ALIAS(WRAPPER_NAME(pthread_key_create));
1116 INTERCEPTOR(int, pthread_join, void *th, void **retval) {
1117 ENSURE_MSAN_INITED();
1118 int res = REAL(pthread_join)(th, retval);
1120 __msan_unpoison(retval, sizeof(*retval));
1124 extern char *tzname[2];
1126 INTERCEPTOR(void, tzset, int fake) {
1127 ENSURE_MSAN_INITED();
1130 __msan_unpoison(tzname[0], REAL(strlen)(tzname[0]) + 1);
1132 __msan_unpoison(tzname[1], REAL(strlen)(tzname[1]) + 1);
1136 struct MSanAtExitRecord {
1137 void (*func)(void *arg);
1141 void MSanAtExitWrapper(void *arg) {
1143 MSanAtExitRecord *r = (MSanAtExitRecord *)arg;
1148 // Unpoison argument shadow for C++ module destructors.
1149 INTERCEPTOR(int, __cxa_atexit, void (*func)(void *), void *arg,
1151 if (msan_init_is_running) return REAL(__cxa_atexit)(func, arg, dso_handle);
1152 ENSURE_MSAN_INITED();
1153 MSanAtExitRecord *r =
1154 (MSanAtExitRecord *)InternalAlloc(sizeof(MSanAtExitRecord));
1157 return REAL(__cxa_atexit)(MSanAtExitWrapper, r, dso_handle);
1160 static void BeforeFork() {
1161 StackDepotLockAll();
1162 ChainedOriginDepotLockAll();
1165 static void AfterFork() {
1166 ChainedOriginDepotUnlockAll();
1167 StackDepotUnlockAll();
1170 INTERCEPTOR(int, fork, void) {
1171 ENSURE_MSAN_INITED();
1173 int pid = REAL(fork)();
1178 INTERCEPTOR(int, openpty, int *amaster, int *aslave, char *name,
1179 const void *termp, const void *winp) {
1180 ENSURE_MSAN_INITED();
1181 InterceptorScope interceptor_scope;
1182 int res = REAL(openpty)(amaster, aslave, name, termp, winp);
1184 __msan_unpoison(amaster, sizeof(*amaster));
1185 __msan_unpoison(aslave, sizeof(*aslave));
1190 INTERCEPTOR(int, forkpty, int *amaster, char *name, const void *termp,
1192 ENSURE_MSAN_INITED();
1193 InterceptorScope interceptor_scope;
1194 int res = REAL(forkpty)(amaster, name, termp, winp);
1196 __msan_unpoison(amaster, sizeof(*amaster));
1200 struct MSanInterceptorContext {
1201 bool in_interceptor_scope;
1207 // FIXME: ask frontend whether we need to return failure.
1211 } // namespace __msan
1213 // A version of CHECK_UNPOISONED using a saved scope value. Used in common
1215 #define CHECK_UNPOISONED_CTX(ctx, x, n) \
1217 if (!((MSanInterceptorContext *)ctx)->in_interceptor_scope) \
1218 CHECK_UNPOISONED_0(x, n); \
1221 #define MSAN_INTERCEPT_FUNC(name) \
1223 if ((!INTERCEPT_FUNCTION(name) || !REAL(name))) \
1224 VReport(1, "MemorySanitizer: failed to intercept '" #name "'\n"); \
1227 #define MSAN_INTERCEPT_FUNC_VER(name, ver) \
1229 if ((!INTERCEPT_FUNCTION_VER(name, ver) || !REAL(name))) \
1231 1, "MemorySanitizer: failed to intercept '" #name "@@" #ver "'\n"); \
1234 #define COMMON_INTERCEPT_FUNCTION(name) MSAN_INTERCEPT_FUNC(name)
1235 #define COMMON_INTERCEPT_FUNCTION_VER(name, ver) \
1236 MSAN_INTERCEPT_FUNC_VER(name, ver)
1237 #define COMMON_INTERCEPTOR_UNPOISON_PARAM(count) \
1238 UnpoisonParam(count)
1239 #define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \
1240 __msan_unpoison(ptr, size)
1241 #define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \
1242 CHECK_UNPOISONED_CTX(ctx, ptr, size)
1243 #define COMMON_INTERCEPTOR_INITIALIZE_RANGE(ptr, size) \
1244 __msan_unpoison(ptr, size)
1245 #define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \
1246 if (msan_init_is_running) return REAL(func)(__VA_ARGS__); \
1247 ENSURE_MSAN_INITED(); \
1248 MSanInterceptorContext msan_ctx = {IsInInterceptorScope()}; \
1249 ctx = (void *)&msan_ctx; \
1251 InterceptorScope interceptor_scope; \
1252 __msan_unpoison(__errno_location(), sizeof(int)); /* NOLINT */
1253 #define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
1256 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
1259 #define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
1262 #define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
1265 #define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
1267 } while (false) // FIXME
1268 #define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \
1270 } while (false) // FIXME
1271 #define COMMON_INTERCEPTOR_BLOCK_REAL(name) REAL(name)
1272 #define COMMON_INTERCEPTOR_ON_EXIT(ctx) OnExit()
1273 #define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) \
1275 link_map *map = GET_LINK_MAP_BY_DLOPEN_HANDLE((handle)); \
1276 if (filename && map) \
1277 ForEachMappedRegion(map, __msan_unpoison); \
1280 #define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \
1281 if (MsanThread *t = GetCurrentThread()) { \
1282 *begin = t->tls_begin(); \
1283 *end = t->tls_end(); \
1285 *begin = *end = 0; \
1288 #define COMMON_INTERCEPTOR_MEMSET_IMPL(ctx, block, c, size) \
1291 return __msan_memset(block, c, size); \
1293 #define COMMON_INTERCEPTOR_MEMMOVE_IMPL(ctx, to, from, size) \
1296 return __msan_memmove(to, from, size); \
1298 #define COMMON_INTERCEPTOR_MEMCPY_IMPL(ctx, to, from, size) \
1301 return __msan_memcpy(to, from, size); \
1304 #define COMMON_INTERCEPTOR_COPY_STRING(ctx, to, from, size) \
1306 GET_STORE_STACK_TRACE; \
1307 CopyShadowAndOrigin(to, from, size, &stack); \
1308 __msan_unpoison(to + size, 1); \
1311 #include "sanitizer_common/sanitizer_platform_interceptors.h"
1312 #include "sanitizer_common/sanitizer_common_interceptors.inc"
1314 static uptr signal_impl(int signo, uptr cb);
1315 static int sigaction_impl(int signo, const __sanitizer_sigaction *act,
1316 __sanitizer_sigaction *oldact);
1318 #define SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signo, act, oldact) \
1319 { return sigaction_impl(signo, act, oldact); }
1321 #define SIGNAL_INTERCEPTOR_SIGNAL_IMPL(func, signo, handler) \
1323 handler = signal_impl(signo, handler); \
1324 return REAL(func)(signo, handler); \
1327 #include "sanitizer_common/sanitizer_signal_interceptors.inc"
1329 static int sigaction_impl(int signo, const __sanitizer_sigaction *act,
1330 __sanitizer_sigaction *oldact) {
1331 ENSURE_MSAN_INITED();
1332 if (act) read_sigaction(act);
1334 if (flags()->wrap_signals) {
1335 SpinMutexLock lock(&sigactions_mu);
1336 CHECK_LT(signo, kMaxSignals);
1337 uptr old_cb = atomic_load(&sigactions[signo], memory_order_relaxed);
1338 __sanitizer_sigaction new_act;
1339 __sanitizer_sigaction *pnew_act = act ? &new_act : nullptr;
1341 REAL(memcpy)(pnew_act, act, sizeof(__sanitizer_sigaction));
1342 uptr cb = (uptr)pnew_act->sigaction;
1343 uptr new_cb = (pnew_act->sa_flags & __sanitizer::sa_siginfo)
1344 ? (uptr)SignalAction
1345 : (uptr)SignalHandler;
1346 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
1347 atomic_store(&sigactions[signo], cb, memory_order_relaxed);
1348 pnew_act->sigaction = (decltype(pnew_act->sigaction))new_cb;
1351 res = REAL(SIGACTION_SYMNAME)(signo, pnew_act, oldact);
1352 if (res == 0 && oldact) {
1353 uptr cb = (uptr)oldact->sigaction;
1354 if (cb == (uptr)SignalAction || cb == (uptr)SignalHandler) {
1355 oldact->sigaction = (decltype(oldact->sigaction))old_cb;
1359 res = REAL(SIGACTION_SYMNAME)(signo, act, oldact);
1362 if (res == 0 && oldact) {
1363 __msan_unpoison(oldact, sizeof(__sanitizer_sigaction));
1368 static uptr signal_impl(int signo, uptr cb) {
1369 ENSURE_MSAN_INITED();
1370 if (flags()->wrap_signals) {
1371 CHECK_LT(signo, kMaxSignals);
1372 SpinMutexLock lock(&sigactions_mu);
1373 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
1374 atomic_store(&sigactions[signo], cb, memory_order_relaxed);
1375 cb = (uptr)&SignalHandler;
1381 #define COMMON_SYSCALL_PRE_READ_RANGE(p, s) CHECK_UNPOISONED(p, s)
1382 #define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
1385 #define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
1388 #define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) __msan_unpoison(p, s)
1389 #include "sanitizer_common/sanitizer_common_syscalls.inc"
1398 INTERCEPTOR(int, dladdr, void *addr, dlinfo *info) {
1400 COMMON_INTERCEPTOR_ENTER(ctx, dladdr, addr, info);
1401 int res = REAL(dladdr)(addr, info);
1403 __msan_unpoison(info, sizeof(*info));
1404 if (info->dli_fname)
1405 __msan_unpoison(info->dli_fname, REAL(strlen)(info->dli_fname) + 1);
1406 if (info->dli_sname)
1407 __msan_unpoison(info->dli_sname, REAL(strlen)(info->dli_sname) + 1);
1412 INTERCEPTOR(char *, dlerror, int fake) {
1414 COMMON_INTERCEPTOR_ENTER(ctx, dlerror, fake);
1415 char *res = REAL(dlerror)(fake);
1416 if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
1420 typedef int (*dl_iterate_phdr_cb)(__sanitizer_dl_phdr_info *info, SIZE_T size,
1422 struct dl_iterate_phdr_data {
1423 dl_iterate_phdr_cb callback;
1427 static int msan_dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size,
1430 __msan_unpoison(info, size);
1431 if (info->dlpi_phdr && info->dlpi_phnum)
1432 __msan_unpoison(info->dlpi_phdr, struct_ElfW_Phdr_sz * info->dlpi_phnum);
1433 if (info->dlpi_name)
1434 __msan_unpoison(info->dlpi_name, REAL(strlen)(info->dlpi_name) + 1);
1436 dl_iterate_phdr_data *cbdata = (dl_iterate_phdr_data *)data;
1438 return cbdata->callback(info, size, cbdata->data);
1441 INTERCEPTOR(void *, shmat, int shmid, const void *shmaddr, int shmflg) {
1442 ENSURE_MSAN_INITED();
1443 void *p = REAL(shmat)(shmid, shmaddr, shmflg);
1444 if (p != (void *)-1) {
1445 __sanitizer_shmid_ds ds;
1446 int res = REAL(shmctl)(shmid, shmctl_ipc_stat, &ds);
1448 __msan_unpoison(p, ds.shm_segsz);
1454 INTERCEPTOR(int, dl_iterate_phdr, dl_iterate_phdr_cb callback, void *data) {
1456 COMMON_INTERCEPTOR_ENTER(ctx, dl_iterate_phdr, callback, data);
1457 dl_iterate_phdr_data cbdata;
1458 cbdata.callback = callback;
1460 int res = REAL(dl_iterate_phdr)(msan_dl_iterate_phdr_cb, (void *)&cbdata);
1464 // wchar_t *wcschr(const wchar_t *wcs, wchar_t wc);
1465 INTERCEPTOR(wchar_t *, wcschr, void *s, wchar_t wc, void *ps) {
1466 ENSURE_MSAN_INITED();
1467 wchar_t *res = REAL(wcschr)(s, wc, ps);
1471 // wchar_t *wcscpy(wchar_t *dest, const wchar_t *src);
1472 INTERCEPTOR(wchar_t *, wcscpy, wchar_t *dest, const wchar_t *src) {
1473 ENSURE_MSAN_INITED();
1474 GET_STORE_STACK_TRACE;
1475 wchar_t *res = REAL(wcscpy)(dest, src);
1476 CopyShadowAndOrigin(dest, src, sizeof(wchar_t) * (REAL(wcslen)(src) + 1),
1481 INTERCEPTOR(wchar_t *, wcsncpy, wchar_t *dest, const wchar_t *src,
1482 SIZE_T n) { // NOLINT
1483 ENSURE_MSAN_INITED();
1484 GET_STORE_STACK_TRACE;
1485 SIZE_T copy_size = REAL(wcsnlen)(src, n);
1486 if (copy_size < n) copy_size++; // trailing \0
1487 wchar_t *res = REAL(wcsncpy)(dest, src, n); // NOLINT
1488 CopyShadowAndOrigin(dest, src, copy_size * sizeof(wchar_t), &stack);
1489 __msan_unpoison(dest + copy_size, (n - copy_size) * sizeof(wchar_t));
1493 // These interface functions reside here so that they can use
1494 // REAL(memset), etc.
1495 void __msan_unpoison(const void *a, uptr size) {
1496 if (!MEM_IS_APP(a)) return;
1497 SetShadow(a, size, 0);
1500 void __msan_poison(const void *a, uptr size) {
1501 if (!MEM_IS_APP(a)) return;
1502 SetShadow(a, size, __msan::flags()->poison_heap_with_zeroes ? 0 : -1);
1505 void __msan_poison_stack(void *a, uptr size) {
1506 if (!MEM_IS_APP(a)) return;
1507 SetShadow(a, size, __msan::flags()->poison_stack_with_zeroes ? 0 : -1);
1510 void __msan_clear_and_unpoison(void *a, uptr size) {
1511 REAL(memset)(a, 0, size);
1512 SetShadow(a, size, 0);
1515 void *__msan_memcpy(void *dest, const void *src, SIZE_T n) {
1516 if (!msan_inited) return internal_memcpy(dest, src, n);
1517 if (msan_init_is_running || __msan::IsInSymbolizer())
1518 return REAL(memcpy)(dest, src, n);
1519 ENSURE_MSAN_INITED();
1520 GET_STORE_STACK_TRACE;
1521 void *res = REAL(memcpy)(dest, src, n);
1522 CopyShadowAndOrigin(dest, src, n, &stack);
1526 void *__msan_memset(void *s, int c, SIZE_T n) {
1527 if (!msan_inited) return internal_memset(s, c, n);
1528 if (msan_init_is_running) return REAL(memset)(s, c, n);
1529 ENSURE_MSAN_INITED();
1530 void *res = REAL(memset)(s, c, n);
1531 __msan_unpoison(s, n);
1535 void *__msan_memmove(void *dest, const void *src, SIZE_T n) {
1536 if (!msan_inited) return internal_memmove(dest, src, n);
1537 if (msan_init_is_running) return REAL(memmove)(dest, src, n);
1538 ENSURE_MSAN_INITED();
1539 GET_STORE_STACK_TRACE;
1540 void *res = REAL(memmove)(dest, src, n);
1541 MoveShadowAndOrigin(dest, src, n, &stack);
1545 void __msan_unpoison_string(const char* s) {
1546 if (!MEM_IS_APP(s)) return;
1547 __msan_unpoison(s, REAL(strlen)(s) + 1);
1552 void InitializeInterceptors() {
1553 static int inited = 0;
1554 CHECK_EQ(inited, 0);
1555 InitializeCommonInterceptors();
1556 InitializeSignalInterceptors();
1558 INTERCEPT_FUNCTION(mmap);
1559 MSAN_MAYBE_INTERCEPT_MMAP64;
1560 INTERCEPT_FUNCTION(posix_memalign);
1561 MSAN_MAYBE_INTERCEPT_MEMALIGN;
1562 MSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN;
1563 INTERCEPT_FUNCTION(valloc);
1564 MSAN_MAYBE_INTERCEPT_PVALLOC;
1565 INTERCEPT_FUNCTION(malloc);
1566 INTERCEPT_FUNCTION(calloc);
1567 INTERCEPT_FUNCTION(realloc);
1568 INTERCEPT_FUNCTION(free);
1569 MSAN_MAYBE_INTERCEPT_CFREE;
1570 MSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE;
1571 MSAN_MAYBE_INTERCEPT_MALLINFO;
1572 MSAN_MAYBE_INTERCEPT_MALLOPT;
1573 MSAN_MAYBE_INTERCEPT_MALLOC_STATS;
1574 INTERCEPT_FUNCTION(fread);
1575 MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED;
1576 INTERCEPT_FUNCTION(readlink);
1577 INTERCEPT_FUNCTION(memccpy);
1578 MSAN_MAYBE_INTERCEPT_MEMPCPY;
1579 INTERCEPT_FUNCTION(bcopy);
1580 INTERCEPT_FUNCTION(wmemset);
1581 INTERCEPT_FUNCTION(wmemcpy);
1582 MSAN_MAYBE_INTERCEPT_WMEMPCPY;
1583 INTERCEPT_FUNCTION(wmemmove);
1584 INTERCEPT_FUNCTION(strcpy); // NOLINT
1585 MSAN_MAYBE_INTERCEPT_STPCPY; // NOLINT
1586 INTERCEPT_FUNCTION(strdup);
1587 MSAN_MAYBE_INTERCEPT___STRDUP;
1588 INTERCEPT_FUNCTION(strncpy); // NOLINT
1589 MSAN_MAYBE_INTERCEPT_GCVT;
1590 INTERCEPT_FUNCTION(strcat); // NOLINT
1591 INTERCEPT_FUNCTION(strncat); // NOLINT
1592 INTERCEPT_STRTO(strtod);
1593 INTERCEPT_STRTO(strtof);
1594 INTERCEPT_STRTO(strtold);
1595 INTERCEPT_STRTO(strtol);
1596 INTERCEPT_STRTO(strtoul);
1597 INTERCEPT_STRTO(strtoll);
1598 INTERCEPT_STRTO(strtoull);
1599 INTERCEPT_STRTO(strtouq);
1600 INTERCEPT_STRTO(wcstod);
1601 INTERCEPT_STRTO(wcstof);
1602 INTERCEPT_STRTO(wcstold);
1603 INTERCEPT_STRTO(wcstol);
1604 INTERCEPT_STRTO(wcstoul);
1605 INTERCEPT_STRTO(wcstoll);
1606 INTERCEPT_STRTO(wcstoull);
1607 #ifdef SANITIZER_NLDBL_VERSION
1608 INTERCEPT_FUNCTION_VER(vswprintf, SANITIZER_NLDBL_VERSION);
1609 INTERCEPT_FUNCTION_VER(swprintf, SANITIZER_NLDBL_VERSION);
1611 INTERCEPT_FUNCTION(vswprintf);
1612 INTERCEPT_FUNCTION(swprintf);
1614 INTERCEPT_FUNCTION(strxfrm);
1615 INTERCEPT_FUNCTION(strxfrm_l);
1616 MSAN_MAYBE_INTERCEPT___STRXFRM_L;
1617 INTERCEPT_FUNCTION(strftime);
1618 INTERCEPT_FUNCTION(strftime_l);
1619 MSAN_MAYBE_INTERCEPT___STRFTIME_L;
1620 INTERCEPT_FUNCTION(wcsftime);
1621 INTERCEPT_FUNCTION(wcsftime_l);
1622 MSAN_MAYBE_INTERCEPT___WCSFTIME_L;
1623 INTERCEPT_FUNCTION(mbtowc);
1624 INTERCEPT_FUNCTION(mbrtowc);
1625 INTERCEPT_FUNCTION(wcslen);
1626 INTERCEPT_FUNCTION(wcsnlen);
1627 INTERCEPT_FUNCTION(wcschr);
1628 INTERCEPT_FUNCTION(wcscpy);
1629 INTERCEPT_FUNCTION(wcsncpy);
1630 INTERCEPT_FUNCTION(wcscmp);
1631 INTERCEPT_FUNCTION(getenv);
1632 INTERCEPT_FUNCTION(setenv);
1633 INTERCEPT_FUNCTION(putenv);
1634 INTERCEPT_FUNCTION(gettimeofday);
1635 MSAN_MAYBE_INTERCEPT_FCVT;
1636 MSAN_MAYBE_INTERCEPT___FXSTAT;
1637 MSAN_INTERCEPT_FSTATAT;
1638 MSAN_MAYBE_INTERCEPT___FXSTAT64;
1639 MSAN_MAYBE_INTERCEPT___FXSTATAT64;
1640 INTERCEPT_FUNCTION(pipe);
1641 INTERCEPT_FUNCTION(pipe2);
1642 INTERCEPT_FUNCTION(socketpair);
1643 INTERCEPT_FUNCTION(fgets);
1644 MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED;
1645 INTERCEPT_FUNCTION(getrlimit);
1646 MSAN_MAYBE_INTERCEPT_GETRLIMIT64;
1647 MSAN_MAYBE_INTERCEPT_PRLIMIT;
1648 MSAN_MAYBE_INTERCEPT_PRLIMIT64;
1649 MSAN_INTERCEPT_UNAME;
1650 INTERCEPT_FUNCTION(gethostname);
1651 MSAN_MAYBE_INTERCEPT_EPOLL_WAIT;
1652 MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT;
1653 INTERCEPT_FUNCTION(dladdr);
1654 INTERCEPT_FUNCTION(dlerror);
1655 INTERCEPT_FUNCTION(dl_iterate_phdr);
1656 INTERCEPT_FUNCTION(getrusage);
1657 #if defined(__mips__)
1658 INTERCEPT_FUNCTION_VER(pthread_create, "GLIBC_2.2");
1660 INTERCEPT_FUNCTION(pthread_create);
1662 INTERCEPT_FUNCTION(pthread_key_create);
1664 #if SANITIZER_NETBSD
1665 INTERCEPT_FUNCTION(__libc_thr_keycreate);
1668 INTERCEPT_FUNCTION(pthread_join);
1669 INTERCEPT_FUNCTION(tzset);
1670 INTERCEPT_FUNCTION(__cxa_atexit);
1671 INTERCEPT_FUNCTION(shmat);
1672 INTERCEPT_FUNCTION(fork);
1673 INTERCEPT_FUNCTION(openpty);
1674 INTERCEPT_FUNCTION(forkpty);
1678 } // namespace __msan