1 //===-- msan_interceptors.cc ----------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is a part of MemorySanitizer.
12 // Interceptors for standard library functions.
14 // FIXME: move as many interceptors as possible into
15 // sanitizer_common/sanitizer_common_interceptors.h
16 //===----------------------------------------------------------------------===//
18 #include "interception/interception.h"
20 #include "msan_chained_origin_depot.h"
21 #include "msan_origin.h"
22 #include "msan_thread.h"
23 #include "msan_poisoning.h"
24 #include "sanitizer_common/sanitizer_platform_limits_posix.h"
25 #include "sanitizer_common/sanitizer_allocator.h"
26 #include "sanitizer_common/sanitizer_allocator_interface.h"
27 #include "sanitizer_common/sanitizer_allocator_internal.h"
28 #include "sanitizer_common/sanitizer_atomic.h"
29 #include "sanitizer_common/sanitizer_common.h"
30 #include "sanitizer_common/sanitizer_stackdepot.h"
31 #include "sanitizer_common/sanitizer_libc.h"
32 #include "sanitizer_common/sanitizer_linux.h"
33 #include "sanitizer_common/sanitizer_tls_get_addr.h"
36 // ACHTUNG! No other system header includes in this file.
37 // Ideally, we should get rid of stdarg.h as well.
39 using namespace __msan;
41 using __sanitizer::memory_order;
42 using __sanitizer::atomic_load;
43 using __sanitizer::atomic_store;
44 using __sanitizer::atomic_uintptr_t;
46 DECLARE_REAL(SIZE_T, strlen, const char *s)
47 DECLARE_REAL(SIZE_T, strnlen, const char *s, SIZE_T maxlen)
48 DECLARE_REAL(void *, memcpy, void *dest, const void *src, uptr n)
49 DECLARE_REAL(void *, memset, void *dest, int c, uptr n)
52 #define __errno_location __error
55 // True if this is a nested interceptor.
56 static THREADLOCAL int in_interceptor_scope;
58 extern "C" int *__errno_location(void);
60 struct InterceptorScope {
61 InterceptorScope() { ++in_interceptor_scope; }
62 ~InterceptorScope() { --in_interceptor_scope; }
65 bool IsInInterceptorScope() {
66 return in_interceptor_scope;
69 static uptr allocated_for_dlsym;
70 static const uptr kDlsymAllocPoolSize = 1024;
71 static uptr alloc_memory_for_dlsym[kDlsymAllocPoolSize];
73 static bool IsInDlsymAllocPool(const void *ptr) {
74 uptr off = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
75 return off < sizeof(alloc_memory_for_dlsym);
78 static void *AllocateFromLocalPool(uptr size_in_bytes) {
79 uptr size_in_words = RoundUpTo(size_in_bytes, kWordSize) / kWordSize;
80 void *mem = (void *)&alloc_memory_for_dlsym[allocated_for_dlsym];
81 allocated_for_dlsym += size_in_words;
82 CHECK_LT(allocated_for_dlsym, kDlsymAllocPoolSize);
86 #define ENSURE_MSAN_INITED() do { \
87 CHECK(!msan_init_is_running); \
93 // Check that [x, x+n) range is unpoisoned.
94 #define CHECK_UNPOISONED_0(x, n) \
96 sptr offset = __msan_test_shadow(x, n); \
97 if (__msan::IsInSymbolizer()) \
99 if (offset >= 0 && __msan::flags()->report_umrs) { \
100 GET_CALLER_PC_BP_SP; \
102 ReportUMRInsideAddressRange(__func__, x, n, offset); \
103 __msan::PrintWarningWithOrigin( \
104 pc, bp, __msan_get_origin((const char *)x + offset)); \
105 if (__msan::flags()->halt_on_error) { \
106 Printf("Exiting\n"); \
112 // Check that [x, x+n) range is unpoisoned unless we are in a nested
114 #define CHECK_UNPOISONED(x, n) \
116 if (!IsInInterceptorScope()) CHECK_UNPOISONED_0(x, n); \
119 #define CHECK_UNPOISONED_STRING_OF_LEN(x, len, n) \
120 CHECK_UNPOISONED((x), \
121 common_flags()->strict_string_checks ? (len) + 1 : (n) )
123 #define CHECK_UNPOISONED_STRING(x, n) \
124 CHECK_UNPOISONED_STRING_OF_LEN((x), internal_strlen(x), (n))
126 #if !SANITIZER_FREEBSD
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 INTERCEPTOR(void *, mempcpy, void *dest, const void *src, SIZE_T n) {
150 return (char *)__msan_memcpy(dest, src, n) + n;
153 INTERCEPTOR(void *, memccpy, void *dest, const void *src, int c, SIZE_T n) {
154 ENSURE_MSAN_INITED();
155 void *res = REAL(memccpy)(dest, src, c, n);
156 CHECK(!res || (res >= dest && res <= (char *)dest + n));
157 SIZE_T sz = res ? (char *)res - (char *)dest : n;
158 CHECK_UNPOISONED(src, sz);
159 __msan_unpoison(dest, sz);
163 INTERCEPTOR(void *, bcopy, const void *src, void *dest, SIZE_T n) {
164 return __msan_memmove(dest, src, n);
167 INTERCEPTOR(int, posix_memalign, void **memptr, SIZE_T alignment, SIZE_T size) {
168 GET_MALLOC_STACK_TRACE;
169 CHECK_EQ(alignment & (alignment - 1), 0);
171 *memptr = MsanReallocate(&stack, nullptr, size, alignment, false);
172 CHECK_NE(*memptr, 0);
173 __msan_unpoison(memptr, sizeof(*memptr));
177 #if !SANITIZER_FREEBSD
178 INTERCEPTOR(void *, memalign, SIZE_T boundary, SIZE_T size) {
179 GET_MALLOC_STACK_TRACE;
180 CHECK_EQ(boundary & (boundary - 1), 0);
181 void *ptr = MsanReallocate(&stack, nullptr, size, boundary, false);
184 #define MSAN_MAYBE_INTERCEPT_MEMALIGN INTERCEPT_FUNCTION(memalign)
186 #define MSAN_MAYBE_INTERCEPT_MEMALIGN
189 INTERCEPTOR(void *, aligned_alloc, SIZE_T boundary, SIZE_T size) {
190 GET_MALLOC_STACK_TRACE;
191 CHECK_EQ(boundary & (boundary - 1), 0);
192 void *ptr = MsanReallocate(&stack, nullptr, size, boundary, false);
196 INTERCEPTOR(void *, __libc_memalign, SIZE_T boundary, SIZE_T size) {
197 GET_MALLOC_STACK_TRACE;
198 CHECK_EQ(boundary & (boundary - 1), 0);
199 void *ptr = MsanReallocate(&stack, nullptr, size, boundary, false);
200 DTLS_on_libc_memalign(ptr, size);
204 INTERCEPTOR(void *, valloc, SIZE_T size) {
205 GET_MALLOC_STACK_TRACE;
206 void *ptr = MsanReallocate(&stack, nullptr, size, GetPageSizeCached(), false);
210 #if !SANITIZER_FREEBSD
211 INTERCEPTOR(void *, pvalloc, SIZE_T size) {
212 GET_MALLOC_STACK_TRACE;
213 uptr PageSize = GetPageSizeCached();
214 size = RoundUpTo(size, PageSize);
216 // pvalloc(0) should allocate one page.
219 void *ptr = MsanReallocate(&stack, nullptr, size, PageSize, false);
222 #define MSAN_MAYBE_INTERCEPT_PVALLOC INTERCEPT_FUNCTION(pvalloc)
224 #define MSAN_MAYBE_INTERCEPT_PVALLOC
227 INTERCEPTOR(void, free, void *ptr) {
228 GET_MALLOC_STACK_TRACE;
229 if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
230 MsanDeallocate(&stack, ptr);
233 #if !SANITIZER_FREEBSD
234 INTERCEPTOR(void, cfree, void *ptr) {
235 GET_MALLOC_STACK_TRACE;
236 if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
237 MsanDeallocate(&stack, ptr);
239 #define MSAN_MAYBE_INTERCEPT_CFREE INTERCEPT_FUNCTION(cfree)
241 #define MSAN_MAYBE_INTERCEPT_CFREE
244 INTERCEPTOR(uptr, malloc_usable_size, void *ptr) {
245 return __sanitizer_get_allocated_size(ptr);
248 #if !SANITIZER_FREEBSD
249 // This function actually returns a struct by value, but we can't unpoison a
250 // temporary! The following is equivalent on all supported platforms but
251 // aarch64 (which uses a different register for sret value). We have a test
253 INTERCEPTOR(void, mallinfo, __sanitizer_mallinfo *sret) {
256 asm volatile("mov %0,x8" : "=r" (r8));
257 sret = reinterpret_cast<__sanitizer_mallinfo*>(r8);
259 REAL(memset)(sret, 0, sizeof(*sret));
260 __msan_unpoison(sret, sizeof(*sret));
262 #define MSAN_MAYBE_INTERCEPT_MALLINFO INTERCEPT_FUNCTION(mallinfo)
264 #define MSAN_MAYBE_INTERCEPT_MALLINFO
267 #if !SANITIZER_FREEBSD
268 INTERCEPTOR(int, mallopt, int cmd, int value) {
271 #define MSAN_MAYBE_INTERCEPT_MALLOPT INTERCEPT_FUNCTION(mallopt)
273 #define MSAN_MAYBE_INTERCEPT_MALLOPT
276 #if !SANITIZER_FREEBSD
277 INTERCEPTOR(void, malloc_stats, void) {
278 // FIXME: implement, but don't call REAL(malloc_stats)!
280 #define MSAN_MAYBE_INTERCEPT_MALLOC_STATS INTERCEPT_FUNCTION(malloc_stats)
282 #define MSAN_MAYBE_INTERCEPT_MALLOC_STATS
285 INTERCEPTOR(char *, strcpy, char *dest, const char *src) { // NOLINT
286 ENSURE_MSAN_INITED();
287 GET_STORE_STACK_TRACE;
288 SIZE_T n = REAL(strlen)(src);
289 CHECK_UNPOISONED_STRING(src + n, 0);
290 char *res = REAL(strcpy)(dest, src); // NOLINT
291 CopyShadowAndOrigin(dest, src, n + 1, &stack);
295 INTERCEPTOR(char *, strncpy, char *dest, const char *src, SIZE_T n) { // NOLINT
296 ENSURE_MSAN_INITED();
297 GET_STORE_STACK_TRACE;
298 SIZE_T copy_size = REAL(strnlen)(src, n);
300 copy_size++; // trailing \0
301 char *res = REAL(strncpy)(dest, src, n); // NOLINT
302 CopyShadowAndOrigin(dest, src, copy_size, &stack);
303 __msan_unpoison(dest + copy_size, n - copy_size);
307 INTERCEPTOR(char *, stpcpy, char *dest, const char *src) { // NOLINT
308 ENSURE_MSAN_INITED();
309 GET_STORE_STACK_TRACE;
310 SIZE_T n = REAL(strlen)(src);
311 CHECK_UNPOISONED_STRING(src + n, 0);
312 char *res = REAL(stpcpy)(dest, src); // NOLINT
313 CopyShadowAndOrigin(dest, src, n + 1, &stack);
317 INTERCEPTOR(char *, strdup, char *src) {
318 ENSURE_MSAN_INITED();
319 GET_STORE_STACK_TRACE;
320 // On FreeBSD strdup() leverages strlen().
321 InterceptorScope interceptor_scope;
322 SIZE_T n = REAL(strlen)(src);
323 CHECK_UNPOISONED_STRING(src + n, 0);
324 char *res = REAL(strdup)(src);
325 CopyShadowAndOrigin(res, src, n + 1, &stack);
329 #if !SANITIZER_FREEBSD
330 INTERCEPTOR(char *, __strdup, char *src) {
331 ENSURE_MSAN_INITED();
332 GET_STORE_STACK_TRACE;
333 SIZE_T n = REAL(strlen)(src);
334 CHECK_UNPOISONED_STRING(src + n, 0);
335 char *res = REAL(__strdup)(src);
336 CopyShadowAndOrigin(res, src, n + 1, &stack);
339 #define MSAN_MAYBE_INTERCEPT___STRDUP INTERCEPT_FUNCTION(__strdup)
341 #define MSAN_MAYBE_INTERCEPT___STRDUP
344 INTERCEPTOR(char *, strndup, char *src, SIZE_T n) {
345 ENSURE_MSAN_INITED();
346 GET_STORE_STACK_TRACE;
347 // On FreeBSD strndup() leverages strnlen().
348 InterceptorScope interceptor_scope;
349 SIZE_T copy_size = REAL(strnlen)(src, n);
350 char *res = REAL(strndup)(src, n);
351 CopyShadowAndOrigin(res, src, copy_size, &stack);
352 __msan_unpoison(res + copy_size, 1); // \0
356 #if !SANITIZER_FREEBSD
357 INTERCEPTOR(char *, __strndup, char *src, SIZE_T n) {
358 ENSURE_MSAN_INITED();
359 GET_STORE_STACK_TRACE;
360 SIZE_T copy_size = REAL(strnlen)(src, n);
361 char *res = REAL(__strndup)(src, n);
362 CopyShadowAndOrigin(res, src, copy_size, &stack);
363 __msan_unpoison(res + copy_size, 1); // \0
366 #define MSAN_MAYBE_INTERCEPT___STRNDUP INTERCEPT_FUNCTION(__strndup)
368 #define MSAN_MAYBE_INTERCEPT___STRNDUP
371 INTERCEPTOR(char *, gcvt, double number, SIZE_T ndigit, char *buf) {
372 ENSURE_MSAN_INITED();
373 char *res = REAL(gcvt)(number, ndigit, buf);
374 SIZE_T n = REAL(strlen)(buf);
375 __msan_unpoison(buf, n + 1);
379 INTERCEPTOR(char *, strcat, char *dest, const char *src) { // NOLINT
380 ENSURE_MSAN_INITED();
381 GET_STORE_STACK_TRACE;
382 SIZE_T src_size = REAL(strlen)(src);
383 SIZE_T dest_size = REAL(strlen)(dest);
384 CHECK_UNPOISONED_STRING(src + src_size, 0);
385 CHECK_UNPOISONED_STRING(dest + dest_size, 0);
386 char *res = REAL(strcat)(dest, src); // NOLINT
387 CopyShadowAndOrigin(dest + dest_size, src, src_size + 1, &stack);
391 INTERCEPTOR(char *, strncat, char *dest, const char *src, SIZE_T n) { // NOLINT
392 ENSURE_MSAN_INITED();
393 GET_STORE_STACK_TRACE;
394 SIZE_T dest_size = REAL(strlen)(dest);
395 SIZE_T copy_size = REAL(strnlen)(src, n);
396 CHECK_UNPOISONED_STRING(dest + dest_size, 0);
397 char *res = REAL(strncat)(dest, src, n); // NOLINT
398 CopyShadowAndOrigin(dest + dest_size, src, copy_size, &stack);
399 __msan_unpoison(dest + dest_size + copy_size, 1); // \0
403 // Hack: always pass nptr and endptr as part of __VA_ARGS_ to avoid having to
404 // deal with empty __VA_ARGS__ in the case of INTERCEPTOR_STRTO.
405 #define INTERCEPTOR_STRTO_BODY(ret_type, func, ...) \
406 ENSURE_MSAN_INITED(); \
407 ret_type res = REAL(func)(__VA_ARGS__); \
408 __msan_unpoison(endptr, sizeof(*endptr)); \
411 #define INTERCEPTOR_STRTO(ret_type, func, char_type) \
412 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr) { \
413 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr); \
416 #define INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
417 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
419 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base); \
422 #define INTERCEPTOR_STRTO_LOC(ret_type, func, char_type) \
423 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
425 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, loc); \
428 #define INTERCEPTOR_STRTO_BASE_LOC(ret_type, func, char_type) \
429 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
430 int base, void *loc) { \
431 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base, loc); \
434 #define INTERCEPTORS_STRTO(ret_type, func, char_type) \
435 INTERCEPTOR_STRTO(ret_type, func, char_type) \
436 INTERCEPTOR_STRTO_LOC(ret_type, func##_l, char_type) \
437 INTERCEPTOR_STRTO_LOC(ret_type, __##func##_l, char_type) \
438 INTERCEPTOR_STRTO_LOC(ret_type, __##func##_internal, char_type)
440 #define INTERCEPTORS_STRTO_BASE(ret_type, func, char_type) \
441 INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
442 INTERCEPTOR_STRTO_BASE_LOC(ret_type, func##_l, char_type) \
443 INTERCEPTOR_STRTO_BASE_LOC(ret_type, __##func##_l, char_type) \
444 INTERCEPTOR_STRTO_BASE_LOC(ret_type, __##func##_internal, char_type)
446 INTERCEPTORS_STRTO(double, strtod, char) // NOLINT
447 INTERCEPTORS_STRTO(float, strtof, char) // NOLINT
448 INTERCEPTORS_STRTO(long double, strtold, char) // NOLINT
449 INTERCEPTORS_STRTO_BASE(long, strtol, char) // NOLINT
450 INTERCEPTORS_STRTO_BASE(long long, strtoll, char) // NOLINT
451 INTERCEPTORS_STRTO_BASE(unsigned long, strtoul, char) // NOLINT
452 INTERCEPTORS_STRTO_BASE(unsigned long long, strtoull, char) // NOLINT
454 INTERCEPTORS_STRTO(double, wcstod, wchar_t) // NOLINT
455 INTERCEPTORS_STRTO(float, wcstof, wchar_t) // NOLINT
456 INTERCEPTORS_STRTO(long double, wcstold, wchar_t) // NOLINT
457 INTERCEPTORS_STRTO_BASE(long, wcstol, wchar_t) // NOLINT
458 INTERCEPTORS_STRTO_BASE(long long, wcstoll, wchar_t) // NOLINT
459 INTERCEPTORS_STRTO_BASE(unsigned long, wcstoul, wchar_t) // NOLINT
460 INTERCEPTORS_STRTO_BASE(unsigned long long, wcstoull, wchar_t) // NOLINT
462 #define INTERCEPT_STRTO(func) \
463 INTERCEPT_FUNCTION(func); \
464 INTERCEPT_FUNCTION(func##_l); \
465 INTERCEPT_FUNCTION(__##func##_l); \
466 INTERCEPT_FUNCTION(__##func##_internal);
469 // FIXME: support *wprintf in common format interceptors.
470 INTERCEPTOR(int, vswprintf, void *str, uptr size, void *format, va_list ap) {
471 ENSURE_MSAN_INITED();
472 int res = REAL(vswprintf)(str, size, format, ap);
474 __msan_unpoison(str, 4 * (res + 1));
479 INTERCEPTOR(int, swprintf, void *str, uptr size, void *format, ...) {
480 ENSURE_MSAN_INITED();
482 va_start(ap, format);
483 int res = vswprintf(str, size, format, ap);
488 INTERCEPTOR(SIZE_T, strxfrm, char *dest, const char *src, SIZE_T n) {
489 ENSURE_MSAN_INITED();
490 CHECK_UNPOISONED(src, REAL(strlen)(src) + 1);
491 SIZE_T res = REAL(strxfrm)(dest, src, n);
492 if (res < n) __msan_unpoison(dest, res + 1);
496 INTERCEPTOR(SIZE_T, strxfrm_l, char *dest, const char *src, SIZE_T n,
498 ENSURE_MSAN_INITED();
499 CHECK_UNPOISONED(src, REAL(strlen)(src) + 1);
500 SIZE_T res = REAL(strxfrm_l)(dest, src, n, loc);
501 if (res < n) __msan_unpoison(dest, res + 1);
505 #define INTERCEPTOR_STRFTIME_BODY(char_type, ret_type, func, s, ...) \
506 ENSURE_MSAN_INITED(); \
507 ret_type res = REAL(func)(s, __VA_ARGS__); \
508 if (s) __msan_unpoison(s, sizeof(char_type) * (res + 1)); \
511 INTERCEPTOR(SIZE_T, strftime, char *s, SIZE_T max, const char *format,
512 __sanitizer_tm *tm) {
513 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, strftime, s, max, format, tm);
516 INTERCEPTOR(SIZE_T, strftime_l, char *s, SIZE_T max, const char *format,
517 __sanitizer_tm *tm, void *loc) {
518 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, strftime_l, s, max, format, tm, loc);
521 #if !SANITIZER_FREEBSD
522 INTERCEPTOR(SIZE_T, __strftime_l, char *s, SIZE_T max, const char *format,
523 __sanitizer_tm *tm, void *loc) {
524 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, __strftime_l, s, max, format, tm,
527 #define MSAN_MAYBE_INTERCEPT___STRFTIME_L INTERCEPT_FUNCTION(__strftime_l)
529 #define MSAN_MAYBE_INTERCEPT___STRFTIME_L
532 INTERCEPTOR(SIZE_T, wcsftime, wchar_t *s, SIZE_T max, const wchar_t *format,
533 __sanitizer_tm *tm) {
534 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, wcsftime, s, max, format, tm);
537 INTERCEPTOR(SIZE_T, wcsftime_l, wchar_t *s, SIZE_T max, const wchar_t *format,
538 __sanitizer_tm *tm, void *loc) {
539 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, wcsftime_l, s, max, format, tm,
543 #if !SANITIZER_FREEBSD
544 INTERCEPTOR(SIZE_T, __wcsftime_l, wchar_t *s, SIZE_T max, const wchar_t *format,
545 __sanitizer_tm *tm, void *loc) {
546 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, __wcsftime_l, s, max, format, tm,
549 #define MSAN_MAYBE_INTERCEPT___WCSFTIME_L INTERCEPT_FUNCTION(__wcsftime_l)
551 #define MSAN_MAYBE_INTERCEPT___WCSFTIME_L
554 INTERCEPTOR(int, mbtowc, wchar_t *dest, const char *src, SIZE_T n) {
555 ENSURE_MSAN_INITED();
556 int res = REAL(mbtowc)(dest, src, n);
557 if (res != -1 && dest) __msan_unpoison(dest, sizeof(wchar_t));
561 INTERCEPTOR(int, mbrtowc, wchar_t *dest, const char *src, SIZE_T n, void *ps) {
562 ENSURE_MSAN_INITED();
563 SIZE_T res = REAL(mbrtowc)(dest, src, n, ps);
564 if (res != (SIZE_T)-1 && dest) __msan_unpoison(dest, sizeof(wchar_t));
568 INTERCEPTOR(SIZE_T, wcslen, const wchar_t *s) {
569 ENSURE_MSAN_INITED();
570 SIZE_T res = REAL(wcslen)(s);
571 CHECK_UNPOISONED(s, sizeof(wchar_t) * (res + 1));
575 INTERCEPTOR(SIZE_T, wcsnlen, const wchar_t *s, SIZE_T n) {
576 ENSURE_MSAN_INITED();
577 SIZE_T res = REAL(wcsnlen)(s, n);
578 CHECK_UNPOISONED(s, sizeof(wchar_t) * Min(res + 1, n));
582 // wchar_t *wcschr(const wchar_t *wcs, wchar_t wc);
583 INTERCEPTOR(wchar_t *, wcschr, void *s, wchar_t wc, void *ps) {
584 ENSURE_MSAN_INITED();
585 wchar_t *res = REAL(wcschr)(s, wc, ps);
589 // wchar_t *wcscpy(wchar_t *dest, const wchar_t *src);
590 INTERCEPTOR(wchar_t *, wcscpy, wchar_t *dest, const wchar_t *src) {
591 ENSURE_MSAN_INITED();
592 GET_STORE_STACK_TRACE;
593 wchar_t *res = REAL(wcscpy)(dest, src);
594 CopyShadowAndOrigin(dest, src, sizeof(wchar_t) * (REAL(wcslen)(src) + 1),
599 INTERCEPTOR(wchar_t *, wcsncpy, wchar_t *dest, const wchar_t *src,
600 SIZE_T n) { // NOLINT
601 ENSURE_MSAN_INITED();
602 GET_STORE_STACK_TRACE;
603 SIZE_T copy_size = REAL(wcsnlen)(src, n);
604 if (copy_size < n) copy_size++; // trailing \0
605 wchar_t *res = REAL(wcsncpy)(dest, src, n); // NOLINT
606 CopyShadowAndOrigin(dest, src, copy_size * sizeof(wchar_t), &stack);
607 __msan_unpoison(dest + copy_size, (n - copy_size) * sizeof(wchar_t));
611 // wchar_t *wmemcpy(wchar_t *dest, const wchar_t *src, SIZE_T n);
612 INTERCEPTOR(wchar_t *, wmemcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
613 ENSURE_MSAN_INITED();
614 GET_STORE_STACK_TRACE;
615 wchar_t *res = REAL(wmemcpy)(dest, src, n);
616 CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
620 INTERCEPTOR(wchar_t *, wmempcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
621 ENSURE_MSAN_INITED();
622 GET_STORE_STACK_TRACE;
623 wchar_t *res = REAL(wmempcpy)(dest, src, n);
624 CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
628 INTERCEPTOR(wchar_t *, wmemset, wchar_t *s, wchar_t c, SIZE_T n) {
629 CHECK(MEM_IS_APP(s));
630 ENSURE_MSAN_INITED();
631 wchar_t *res = REAL(wmemset)(s, c, n);
632 __msan_unpoison(s, n * sizeof(wchar_t));
636 INTERCEPTOR(wchar_t *, wmemmove, wchar_t *dest, const wchar_t *src, SIZE_T n) {
637 ENSURE_MSAN_INITED();
638 GET_STORE_STACK_TRACE;
639 wchar_t *res = REAL(wmemmove)(dest, src, n);
640 MoveShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
644 INTERCEPTOR(int, wcscmp, const wchar_t *s1, const wchar_t *s2) {
645 ENSURE_MSAN_INITED();
646 int res = REAL(wcscmp)(s1, s2);
650 INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
651 ENSURE_MSAN_INITED();
652 int res = REAL(gettimeofday)(tv, tz);
654 __msan_unpoison(tv, 16);
656 __msan_unpoison(tz, 8);
660 INTERCEPTOR(char *, fcvt, double x, int a, int *b, int *c) {
661 ENSURE_MSAN_INITED();
662 char *res = REAL(fcvt)(x, a, b, c);
663 __msan_unpoison(b, sizeof(*b));
664 __msan_unpoison(c, sizeof(*c));
665 if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
669 INTERCEPTOR(char *, getenv, char *name) {
670 if (msan_init_is_running)
671 return REAL(getenv)(name);
672 ENSURE_MSAN_INITED();
673 char *res = REAL(getenv)(name);
674 if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
678 extern char **environ;
680 static void UnpoisonEnviron() {
681 char **envp = environ;
682 for (; *envp; ++envp) {
683 __msan_unpoison(envp, sizeof(*envp));
684 __msan_unpoison(*envp, REAL(strlen)(*envp) + 1);
686 // Trailing NULL pointer.
687 __msan_unpoison(envp, sizeof(*envp));
690 INTERCEPTOR(int, setenv, const char *name, const char *value, int overwrite) {
691 ENSURE_MSAN_INITED();
692 CHECK_UNPOISONED_STRING(name, 0)
693 int res = REAL(setenv)(name, value, overwrite);
694 if (!res) UnpoisonEnviron();
698 INTERCEPTOR(int, putenv, char *string) {
699 ENSURE_MSAN_INITED();
700 int res = REAL(putenv)(string);
701 if (!res) UnpoisonEnviron();
705 #if !SANITIZER_FREEBSD
706 INTERCEPTOR(int, __fxstat, int magic, int fd, void *buf) {
707 ENSURE_MSAN_INITED();
708 int res = REAL(__fxstat)(magic, fd, buf);
710 __msan_unpoison(buf, __sanitizer::struct_stat_sz);
713 #define MSAN_MAYBE_INTERCEPT___FXSTAT INTERCEPT_FUNCTION(__fxstat)
715 #define MSAN_MAYBE_INTERCEPT___FXSTAT
718 #if !SANITIZER_FREEBSD
719 INTERCEPTOR(int, __fxstat64, int magic, int fd, void *buf) {
720 ENSURE_MSAN_INITED();
721 int res = REAL(__fxstat64)(magic, fd, buf);
723 __msan_unpoison(buf, __sanitizer::struct_stat64_sz);
726 #define MSAN_MAYBE_INTERCEPT___FXSTAT64 INTERCEPT_FUNCTION(__fxstat64)
728 #define MSAN_MAYBE_INTERCEPT___FXSTAT64
731 #if SANITIZER_FREEBSD
732 INTERCEPTOR(int, fstatat, int fd, char *pathname, void *buf, int flags) {
733 ENSURE_MSAN_INITED();
734 int res = REAL(fstatat)(fd, pathname, buf, flags);
735 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz);
738 # define MSAN_INTERCEPT_FSTATAT INTERCEPT_FUNCTION(fstatat)
740 INTERCEPTOR(int, __fxstatat, int magic, int fd, char *pathname, void *buf,
742 ENSURE_MSAN_INITED();
743 int res = REAL(__fxstatat)(magic, fd, pathname, buf, flags);
744 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz);
747 # define MSAN_INTERCEPT_FSTATAT INTERCEPT_FUNCTION(__fxstatat)
750 #if !SANITIZER_FREEBSD
751 INTERCEPTOR(int, __fxstatat64, int magic, int fd, char *pathname, void *buf,
753 ENSURE_MSAN_INITED();
754 int res = REAL(__fxstatat64)(magic, fd, pathname, buf, flags);
755 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat64_sz);
758 #define MSAN_MAYBE_INTERCEPT___FXSTATAT64 INTERCEPT_FUNCTION(__fxstatat64)
760 #define MSAN_MAYBE_INTERCEPT___FXSTATAT64
763 INTERCEPTOR(int, pipe, int pipefd[2]) {
764 if (msan_init_is_running)
765 return REAL(pipe)(pipefd);
766 ENSURE_MSAN_INITED();
767 int res = REAL(pipe)(pipefd);
769 __msan_unpoison(pipefd, sizeof(int[2]));
773 INTERCEPTOR(int, pipe2, int pipefd[2], int flags) {
774 ENSURE_MSAN_INITED();
775 int res = REAL(pipe2)(pipefd, flags);
777 __msan_unpoison(pipefd, sizeof(int[2]));
781 INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int sv[2]) {
782 ENSURE_MSAN_INITED();
783 int res = REAL(socketpair)(domain, type, protocol, sv);
785 __msan_unpoison(sv, sizeof(int[2]));
789 INTERCEPTOR(char *, fgets, char *s, int size, void *stream) {
790 ENSURE_MSAN_INITED();
791 char *res = REAL(fgets)(s, size, stream);
793 __msan_unpoison(s, REAL(strlen)(s) + 1);
797 #if !SANITIZER_FREEBSD
798 INTERCEPTOR(char *, fgets_unlocked, char *s, int size, void *stream) {
799 ENSURE_MSAN_INITED();
800 char *res = REAL(fgets_unlocked)(s, size, stream);
802 __msan_unpoison(s, REAL(strlen)(s) + 1);
805 #define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED INTERCEPT_FUNCTION(fgets_unlocked)
807 #define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED
810 INTERCEPTOR(int, getrlimit, int resource, void *rlim) {
811 if (msan_init_is_running)
812 return REAL(getrlimit)(resource, rlim);
813 ENSURE_MSAN_INITED();
814 int res = REAL(getrlimit)(resource, rlim);
816 __msan_unpoison(rlim, __sanitizer::struct_rlimit_sz);
820 #if !SANITIZER_FREEBSD
821 INTERCEPTOR(int, getrlimit64, int resource, void *rlim) {
822 if (msan_init_is_running) return REAL(getrlimit64)(resource, rlim);
823 ENSURE_MSAN_INITED();
824 int res = REAL(getrlimit64)(resource, rlim);
825 if (!res) __msan_unpoison(rlim, __sanitizer::struct_rlimit64_sz);
829 INTERCEPTOR(int, prlimit, int pid, int resource, void *new_rlimit,
831 if (msan_init_is_running)
832 return REAL(prlimit)(pid, resource, new_rlimit, old_rlimit);
833 ENSURE_MSAN_INITED();
834 CHECK_UNPOISONED(new_rlimit, __sanitizer::struct_rlimit_sz);
835 int res = REAL(prlimit)(pid, resource, new_rlimit, old_rlimit);
836 if (!res) __msan_unpoison(old_rlimit, __sanitizer::struct_rlimit_sz);
840 INTERCEPTOR(int, prlimit64, int pid, int resource, void *new_rlimit,
842 if (msan_init_is_running)
843 return REAL(prlimit64)(pid, resource, new_rlimit, old_rlimit);
844 ENSURE_MSAN_INITED();
845 CHECK_UNPOISONED(new_rlimit, __sanitizer::struct_rlimit64_sz);
846 int res = REAL(prlimit64)(pid, resource, new_rlimit, old_rlimit);
847 if (!res) __msan_unpoison(old_rlimit, __sanitizer::struct_rlimit64_sz);
851 #define MSAN_MAYBE_INTERCEPT_GETRLIMIT64 INTERCEPT_FUNCTION(getrlimit64)
852 #define MSAN_MAYBE_INTERCEPT_PRLIMIT INTERCEPT_FUNCTION(prlimit)
853 #define MSAN_MAYBE_INTERCEPT_PRLIMIT64 INTERCEPT_FUNCTION(prlimit64)
855 #define MSAN_MAYBE_INTERCEPT_GETRLIMIT64
856 #define MSAN_MAYBE_INTERCEPT_PRLIMIT
857 #define MSAN_MAYBE_INTERCEPT_PRLIMIT64
860 #if SANITIZER_FREEBSD
861 // FreeBSD's <sys/utsname.h> define uname() as
862 // static __inline int uname(struct utsname *name) {
863 // return __xuname(SYS_NMLN, (void*)name);
865 INTERCEPTOR(int, __xuname, int size, void *utsname) {
866 ENSURE_MSAN_INITED();
867 int res = REAL(__xuname)(size, utsname);
869 __msan_unpoison(utsname, __sanitizer::struct_utsname_sz);
872 #define MSAN_INTERCEPT_UNAME INTERCEPT_FUNCTION(__xuname)
874 INTERCEPTOR(int, uname, struct utsname *utsname) {
875 ENSURE_MSAN_INITED();
876 int res = REAL(uname)(utsname);
878 __msan_unpoison(utsname, __sanitizer::struct_utsname_sz);
881 #define MSAN_INTERCEPT_UNAME INTERCEPT_FUNCTION(uname)
884 INTERCEPTOR(int, gethostname, char *name, SIZE_T len) {
885 ENSURE_MSAN_INITED();
886 int res = REAL(gethostname)(name, len);
888 SIZE_T real_len = REAL(strnlen)(name, len);
891 __msan_unpoison(name, real_len);
896 #if !SANITIZER_FREEBSD
897 INTERCEPTOR(int, epoll_wait, int epfd, void *events, int maxevents,
899 ENSURE_MSAN_INITED();
900 int res = REAL(epoll_wait)(epfd, events, maxevents, timeout);
902 __msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res);
906 #define MSAN_MAYBE_INTERCEPT_EPOLL_WAIT INTERCEPT_FUNCTION(epoll_wait)
908 #define MSAN_MAYBE_INTERCEPT_EPOLL_WAIT
911 #if !SANITIZER_FREEBSD
912 INTERCEPTOR(int, epoll_pwait, int epfd, void *events, int maxevents,
913 int timeout, void *sigmask) {
914 ENSURE_MSAN_INITED();
915 int res = REAL(epoll_pwait)(epfd, events, maxevents, timeout, sigmask);
917 __msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res);
921 #define MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT INTERCEPT_FUNCTION(epoll_pwait)
923 #define MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT
926 INTERCEPTOR(void *, calloc, SIZE_T nmemb, SIZE_T size) {
927 GET_MALLOC_STACK_TRACE;
928 if (UNLIKELY(!msan_inited))
929 // Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym.
930 return AllocateFromLocalPool(nmemb * size);
931 return MsanCalloc(&stack, nmemb, size);
934 INTERCEPTOR(void *, realloc, void *ptr, SIZE_T size) {
935 GET_MALLOC_STACK_TRACE;
936 if (UNLIKELY(IsInDlsymAllocPool(ptr))) {
937 uptr offset = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
938 uptr copy_size = Min(size, kDlsymAllocPoolSize - offset);
940 if (UNLIKELY(!msan_inited)) {
941 new_ptr = AllocateFromLocalPool(copy_size);
944 new_ptr = MsanReallocate(&stack, nullptr, copy_size, sizeof(u64), false);
946 internal_memcpy(new_ptr, ptr, copy_size);
949 return MsanReallocate(&stack, ptr, size, sizeof(u64), false);
952 INTERCEPTOR(void *, malloc, SIZE_T size) {
953 GET_MALLOC_STACK_TRACE;
954 if (UNLIKELY(!msan_inited))
955 // Hack: dlsym calls malloc before REAL(malloc) is retrieved from dlsym.
956 return AllocateFromLocalPool(size);
957 return MsanReallocate(&stack, nullptr, size, sizeof(u64), false);
960 void __msan_allocated_memory(const void *data, uptr size) {
961 GET_MALLOC_STACK_TRACE;
962 if (flags()->poison_in_malloc) {
963 stack.tag = STACK_TRACE_TAG_POISON;
964 PoisonMemory(data, size, &stack);
968 void __msan_copy_shadow(void *dest, const void *src, uptr n) {
969 GET_STORE_STACK_TRACE;
970 MoveShadowAndOrigin(dest, src, n, &stack);
973 void __sanitizer_dtor_callback(const void *data, uptr size) {
974 GET_MALLOC_STACK_TRACE;
975 if (flags()->poison_in_dtor) {
976 stack.tag = STACK_TRACE_TAG_POISON;
977 PoisonMemory(data, size, &stack);
981 INTERCEPTOR(void *, mmap, void *addr, SIZE_T length, int prot, int flags,
982 int fd, OFF_T offset) {
983 if (msan_init_is_running)
984 return REAL(mmap)(addr, length, prot, flags, fd, offset);
985 ENSURE_MSAN_INITED();
986 if (addr && !MEM_IS_APP(addr)) {
987 if (flags & map_fixed) {
988 *__errno_location() = errno_EINVAL;
994 void *res = REAL(mmap)(addr, length, prot, flags, fd, offset);
995 if (res != (void*)-1)
996 __msan_unpoison(res, RoundUpTo(length, GetPageSize()));
1000 #if !SANITIZER_FREEBSD
1001 INTERCEPTOR(void *, mmap64, void *addr, SIZE_T length, int prot, int flags,
1002 int fd, OFF64_T offset) {
1003 ENSURE_MSAN_INITED();
1004 if (addr && !MEM_IS_APP(addr)) {
1005 if (flags & map_fixed) {
1006 *__errno_location() = errno_EINVAL;
1012 void *res = REAL(mmap64)(addr, length, prot, flags, fd, offset);
1013 if (res != (void*)-1)
1014 __msan_unpoison(res, RoundUpTo(length, GetPageSize()));
1017 #define MSAN_MAYBE_INTERCEPT_MMAP64 INTERCEPT_FUNCTION(mmap64)
1019 #define MSAN_MAYBE_INTERCEPT_MMAP64
1022 INTERCEPTOR(int, getrusage, int who, void *usage) {
1023 ENSURE_MSAN_INITED();
1024 int res = REAL(getrusage)(who, usage);
1026 __msan_unpoison(usage, __sanitizer::struct_rusage_sz);
1031 class SignalHandlerScope {
1033 SignalHandlerScope() {
1034 if (MsanThread *t = GetCurrentThread())
1035 t->EnterSignalHandler();
1037 ~SignalHandlerScope() {
1038 if (MsanThread *t = GetCurrentThread())
1039 t->LeaveSignalHandler();
1043 // sigactions_mu guarantees atomicity of sigaction() and signal() calls.
1044 // Access to sigactions[] is gone with relaxed atomics to avoid data race with
1045 // the signal handler.
1046 const int kMaxSignals = 1024;
1047 static atomic_uintptr_t sigactions[kMaxSignals];
1048 static StaticSpinMutex sigactions_mu;
1050 static void SignalHandler(int signo) {
1051 SignalHandlerScope signal_handler_scope;
1052 ScopedThreadLocalStateBackup stlsb;
1055 typedef void (*signal_cb)(int x);
1057 (signal_cb)atomic_load(&sigactions[signo], memory_order_relaxed);
1061 static void SignalAction(int signo, void *si, void *uc) {
1062 SignalHandlerScope signal_handler_scope;
1063 ScopedThreadLocalStateBackup stlsb;
1065 __msan_unpoison(si, sizeof(__sanitizer_sigaction));
1066 __msan_unpoison(uc, __sanitizer::ucontext_t_sz);
1068 typedef void (*sigaction_cb)(int, void *, void *);
1070 (sigaction_cb)atomic_load(&sigactions[signo], memory_order_relaxed);
1074 INTERCEPTOR(int, sigaction, int signo, const __sanitizer_sigaction *act,
1075 __sanitizer_sigaction *oldact) {
1076 ENSURE_MSAN_INITED();
1077 // FIXME: check that *act is unpoisoned.
1078 // That requires intercepting all of sigemptyset, sigfillset, etc.
1080 if (flags()->wrap_signals) {
1081 SpinMutexLock lock(&sigactions_mu);
1082 CHECK_LT(signo, kMaxSignals);
1083 uptr old_cb = atomic_load(&sigactions[signo], memory_order_relaxed);
1084 __sanitizer_sigaction new_act;
1085 __sanitizer_sigaction *pnew_act = act ? &new_act : nullptr;
1087 REAL(memcpy)(pnew_act, act, sizeof(__sanitizer_sigaction));
1088 uptr cb = (uptr)pnew_act->sigaction;
1089 uptr new_cb = (pnew_act->sa_flags & __sanitizer::sa_siginfo)
1090 ? (uptr)SignalAction
1091 : (uptr)SignalHandler;
1092 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
1093 atomic_store(&sigactions[signo], cb, memory_order_relaxed);
1094 pnew_act->sigaction = (void (*)(int, void *, void *))new_cb;
1097 res = REAL(sigaction)(signo, pnew_act, oldact);
1098 if (res == 0 && oldact) {
1099 uptr cb = (uptr)oldact->sigaction;
1100 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
1101 oldact->sigaction = (void (*)(int, void *, void *))old_cb;
1105 res = REAL(sigaction)(signo, act, oldact);
1108 if (res == 0 && oldact) {
1109 __msan_unpoison(oldact, sizeof(__sanitizer_sigaction));
1114 INTERCEPTOR(int, signal, int signo, uptr cb) {
1115 ENSURE_MSAN_INITED();
1116 if (flags()->wrap_signals) {
1117 CHECK_LT(signo, kMaxSignals);
1118 SpinMutexLock lock(&sigactions_mu);
1119 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
1120 atomic_store(&sigactions[signo], cb, memory_order_relaxed);
1121 cb = (uptr) SignalHandler;
1123 return REAL(signal)(signo, cb);
1125 return REAL(signal)(signo, cb);
1129 extern "C" int pthread_attr_init(void *attr);
1130 extern "C" int pthread_attr_destroy(void *attr);
1132 static void *MsanThreadStartFunc(void *arg) {
1133 MsanThread *t = (MsanThread *)arg;
1134 SetCurrentThread(t);
1135 return t->ThreadStart();
1138 INTERCEPTOR(int, pthread_create, void *th, void *attr, void *(*callback)(void*),
1140 ENSURE_MSAN_INITED(); // for GetTlsSize()
1141 __sanitizer_pthread_attr_t myattr;
1143 pthread_attr_init(&myattr);
1147 AdjustStackSize(attr);
1149 MsanThread *t = MsanThread::Create(callback, param);
1151 int res = REAL(pthread_create)(th, attr, MsanThreadStartFunc, t);
1153 if (attr == &myattr)
1154 pthread_attr_destroy(&myattr);
1156 __msan_unpoison(th, __sanitizer::pthread_t_sz);
1161 INTERCEPTOR(int, pthread_key_create, __sanitizer_pthread_key_t *key,
1162 void (*dtor)(void *value)) {
1163 if (msan_init_is_running) return REAL(pthread_key_create)(key, dtor);
1164 ENSURE_MSAN_INITED();
1165 int res = REAL(pthread_key_create)(key, dtor);
1167 __msan_unpoison(key, sizeof(*key));
1171 INTERCEPTOR(int, pthread_join, void *th, void **retval) {
1172 ENSURE_MSAN_INITED();
1173 int res = REAL(pthread_join)(th, retval);
1175 __msan_unpoison(retval, sizeof(*retval));
1179 extern char *tzname[2];
1181 INTERCEPTOR(void, tzset, int fake) {
1182 ENSURE_MSAN_INITED();
1185 __msan_unpoison(tzname[0], REAL(strlen)(tzname[0]) + 1);
1187 __msan_unpoison(tzname[1], REAL(strlen)(tzname[1]) + 1);
1191 struct MSanAtExitRecord {
1192 void (*func)(void *arg);
1196 void MSanAtExitWrapper(void *arg) {
1198 MSanAtExitRecord *r = (MSanAtExitRecord *)arg;
1203 // Unpoison argument shadow for C++ module destructors.
1204 INTERCEPTOR(int, __cxa_atexit, void (*func)(void *), void *arg,
1206 if (msan_init_is_running) return REAL(__cxa_atexit)(func, arg, dso_handle);
1207 ENSURE_MSAN_INITED();
1208 MSanAtExitRecord *r =
1209 (MSanAtExitRecord *)InternalAlloc(sizeof(MSanAtExitRecord));
1212 return REAL(__cxa_atexit)(MSanAtExitWrapper, r, dso_handle);
1215 DECLARE_REAL(int, shmctl, int shmid, int cmd, void *buf)
1217 INTERCEPTOR(void *, shmat, int shmid, const void *shmaddr, int shmflg) {
1218 ENSURE_MSAN_INITED();
1219 void *p = REAL(shmat)(shmid, shmaddr, shmflg);
1220 if (p != (void *)-1) {
1221 __sanitizer_shmid_ds ds;
1222 int res = REAL(shmctl)(shmid, shmctl_ipc_stat, &ds);
1224 __msan_unpoison(p, ds.shm_segsz);
1230 static void BeforeFork() {
1231 StackDepotLockAll();
1232 ChainedOriginDepotLockAll();
1235 static void AfterFork() {
1236 ChainedOriginDepotUnlockAll();
1237 StackDepotUnlockAll();
1240 INTERCEPTOR(int, fork, void) {
1241 ENSURE_MSAN_INITED();
1243 int pid = REAL(fork)();
1248 INTERCEPTOR(int, openpty, int *amaster, int *aslave, char *name,
1249 const void *termp, const void *winp) {
1250 ENSURE_MSAN_INITED();
1251 InterceptorScope interceptor_scope;
1252 int res = REAL(openpty)(amaster, aslave, name, termp, winp);
1254 __msan_unpoison(amaster, sizeof(*amaster));
1255 __msan_unpoison(aslave, sizeof(*aslave));
1260 INTERCEPTOR(int, forkpty, int *amaster, char *name, const void *termp,
1262 ENSURE_MSAN_INITED();
1263 InterceptorScope interceptor_scope;
1264 int res = REAL(forkpty)(amaster, name, termp, winp);
1266 __msan_unpoison(amaster, sizeof(*amaster));
1270 struct MSanInterceptorContext {
1271 bool in_interceptor_scope;
1277 // FIXME: ask frontend whether we need to return failure.
1281 } // namespace __msan
1283 // A version of CHECK_UNPOISONED using a saved scope value. Used in common
1285 #define CHECK_UNPOISONED_CTX(ctx, x, n) \
1287 if (!((MSanInterceptorContext *)ctx)->in_interceptor_scope) \
1288 CHECK_UNPOISONED_0(x, n); \
1291 #define MSAN_INTERCEPT_FUNC(name) \
1293 if ((!INTERCEPT_FUNCTION(name) || !REAL(name))) \
1294 VReport(1, "MemorySanitizer: failed to intercept '" #name "'\n"); \
1297 #define MSAN_INTERCEPT_FUNC_VER(name, ver) \
1299 if ((!INTERCEPT_FUNCTION_VER(name, ver) || !REAL(name))) \
1301 1, "MemorySanitizer: failed to intercept '" #name "@@" #ver "'\n"); \
1304 #define COMMON_INTERCEPT_FUNCTION(name) MSAN_INTERCEPT_FUNC(name)
1305 #define COMMON_INTERCEPT_FUNCTION_VER(name, ver) \
1306 MSAN_INTERCEPT_FUNC_VER(name, ver)
1307 #define COMMON_INTERCEPTOR_UNPOISON_PARAM(count) \
1308 UnpoisonParam(count)
1309 #define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \
1310 __msan_unpoison(ptr, size)
1311 #define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \
1312 CHECK_UNPOISONED_CTX(ctx, ptr, size)
1313 #define COMMON_INTERCEPTOR_INITIALIZE_RANGE(ptr, size) \
1314 __msan_unpoison(ptr, size)
1315 #define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \
1316 if (msan_init_is_running) return REAL(func)(__VA_ARGS__); \
1317 ENSURE_MSAN_INITED(); \
1318 MSanInterceptorContext msan_ctx = {IsInInterceptorScope()}; \
1319 ctx = (void *)&msan_ctx; \
1321 InterceptorScope interceptor_scope; \
1322 __msan_unpoison(__errno_location(), sizeof(int)); /* NOLINT */
1323 #define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
1326 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
1329 #define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
1332 #define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
1335 #define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
1337 } while (false) // FIXME
1338 #define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \
1340 } while (false) // FIXME
1341 #define COMMON_INTERCEPTOR_BLOCK_REAL(name) REAL(name)
1342 #define COMMON_INTERCEPTOR_ON_EXIT(ctx) OnExit()
1343 #define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) \
1345 link_map *map = GET_LINK_MAP_BY_DLOPEN_HANDLE((handle)); \
1346 if (filename && map) \
1347 ForEachMappedRegion(map, __msan_unpoison); \
1350 #define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \
1351 if (MsanThread *t = GetCurrentThread()) { \
1352 *begin = t->tls_begin(); \
1353 *end = t->tls_end(); \
1355 *begin = *end = 0; \
1358 #define COMMON_INTERCEPTOR_MEMSET_IMPL(ctx, block, c, size) \
1361 return __msan_memset(block, c, size); \
1363 #define COMMON_INTERCEPTOR_MEMMOVE_IMPL(ctx, to, from, size) \
1366 return __msan_memmove(to, from, size); \
1368 #define COMMON_INTERCEPTOR_MEMCPY_IMPL(ctx, to, from, size) \
1371 return __msan_memcpy(to, from, size); \
1374 #include "sanitizer_common/sanitizer_platform_interceptors.h"
1375 #include "sanitizer_common/sanitizer_common_interceptors.inc"
1377 #define COMMON_SYSCALL_PRE_READ_RANGE(p, s) CHECK_UNPOISONED(p, s)
1378 #define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
1381 #define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
1384 #define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) __msan_unpoison(p, s)
1385 #include "sanitizer_common/sanitizer_common_syscalls.inc"
1394 INTERCEPTOR(int, dladdr, void *addr, dlinfo *info) {
1396 COMMON_INTERCEPTOR_ENTER(ctx, dladdr, addr, info);
1397 int res = REAL(dladdr)(addr, info);
1399 __msan_unpoison(info, sizeof(*info));
1400 if (info->dli_fname)
1401 __msan_unpoison(info->dli_fname, REAL(strlen)(info->dli_fname) + 1);
1402 if (info->dli_sname)
1403 __msan_unpoison(info->dli_sname, REAL(strlen)(info->dli_sname) + 1);
1408 INTERCEPTOR(char *, dlerror, int fake) {
1410 COMMON_INTERCEPTOR_ENTER(ctx, dlerror, fake);
1411 char *res = REAL(dlerror)(fake);
1412 if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
1416 typedef int (*dl_iterate_phdr_cb)(__sanitizer_dl_phdr_info *info, SIZE_T size,
1418 struct dl_iterate_phdr_data {
1419 dl_iterate_phdr_cb callback;
1423 static int msan_dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size,
1426 __msan_unpoison(info, size);
1427 if (info->dlpi_phdr && info->dlpi_phnum)
1428 __msan_unpoison(info->dlpi_phdr, struct_ElfW_Phdr_sz * info->dlpi_phnum);
1429 if (info->dlpi_name)
1430 __msan_unpoison(info->dlpi_name, REAL(strlen)(info->dlpi_name) + 1);
1432 dl_iterate_phdr_data *cbdata = (dl_iterate_phdr_data *)data;
1434 return cbdata->callback(info, size, cbdata->data);
1437 INTERCEPTOR(int, dl_iterate_phdr, dl_iterate_phdr_cb callback, void *data) {
1439 COMMON_INTERCEPTOR_ENTER(ctx, dl_iterate_phdr, callback, data);
1440 dl_iterate_phdr_data cbdata;
1441 cbdata.callback = callback;
1443 int res = REAL(dl_iterate_phdr)(msan_dl_iterate_phdr_cb, (void *)&cbdata);
1447 // These interface functions reside here so that they can use
1448 // REAL(memset), etc.
1449 void __msan_unpoison(const void *a, uptr size) {
1450 if (!MEM_IS_APP(a)) return;
1451 SetShadow(a, size, 0);
1454 void __msan_poison(const void *a, uptr size) {
1455 if (!MEM_IS_APP(a)) return;
1456 SetShadow(a, size, __msan::flags()->poison_heap_with_zeroes ? 0 : -1);
1459 void __msan_poison_stack(void *a, uptr size) {
1460 if (!MEM_IS_APP(a)) return;
1461 SetShadow(a, size, __msan::flags()->poison_stack_with_zeroes ? 0 : -1);
1464 void __msan_clear_and_unpoison(void *a, uptr size) {
1465 REAL(memset)(a, 0, size);
1466 SetShadow(a, size, 0);
1469 void *__msan_memcpy(void *dest, const void *src, SIZE_T n) {
1470 if (!msan_inited) return internal_memcpy(dest, src, n);
1471 if (msan_init_is_running || __msan::IsInSymbolizer())
1472 return REAL(memcpy)(dest, src, n);
1473 ENSURE_MSAN_INITED();
1474 GET_STORE_STACK_TRACE;
1475 void *res = REAL(memcpy)(dest, src, n);
1476 CopyShadowAndOrigin(dest, src, n, &stack);
1480 void *__msan_memset(void *s, int c, SIZE_T n) {
1481 if (!msan_inited) return internal_memset(s, c, n);
1482 if (msan_init_is_running) return REAL(memset)(s, c, n);
1483 ENSURE_MSAN_INITED();
1484 void *res = REAL(memset)(s, c, n);
1485 __msan_unpoison(s, n);
1489 void *__msan_memmove(void *dest, const void *src, SIZE_T n) {
1490 if (!msan_inited) return internal_memmove(dest, src, n);
1491 if (msan_init_is_running) return REAL(memmove)(dest, src, n);
1492 ENSURE_MSAN_INITED();
1493 GET_STORE_STACK_TRACE;
1494 void *res = REAL(memmove)(dest, src, n);
1495 MoveShadowAndOrigin(dest, src, n, &stack);
1499 void __msan_unpoison_string(const char* s) {
1500 if (!MEM_IS_APP(s)) return;
1501 __msan_unpoison(s, REAL(strlen)(s) + 1);
1506 void InitializeInterceptors() {
1507 static int inited = 0;
1508 CHECK_EQ(inited, 0);
1509 InitializeCommonInterceptors();
1511 INTERCEPT_FUNCTION(mmap);
1512 MSAN_MAYBE_INTERCEPT_MMAP64;
1513 INTERCEPT_FUNCTION(posix_memalign);
1514 MSAN_MAYBE_INTERCEPT_MEMALIGN;
1515 INTERCEPT_FUNCTION(__libc_memalign);
1516 INTERCEPT_FUNCTION(valloc);
1517 MSAN_MAYBE_INTERCEPT_PVALLOC;
1518 INTERCEPT_FUNCTION(malloc);
1519 INTERCEPT_FUNCTION(calloc);
1520 INTERCEPT_FUNCTION(realloc);
1521 INTERCEPT_FUNCTION(free);
1522 MSAN_MAYBE_INTERCEPT_CFREE;
1523 INTERCEPT_FUNCTION(malloc_usable_size);
1524 MSAN_MAYBE_INTERCEPT_MALLINFO;
1525 MSAN_MAYBE_INTERCEPT_MALLOPT;
1526 MSAN_MAYBE_INTERCEPT_MALLOC_STATS;
1527 INTERCEPT_FUNCTION(fread);
1528 MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED;
1529 INTERCEPT_FUNCTION(readlink);
1530 INTERCEPT_FUNCTION(memccpy);
1531 INTERCEPT_FUNCTION(mempcpy);
1532 INTERCEPT_FUNCTION(bcopy);
1533 INTERCEPT_FUNCTION(wmemset);
1534 INTERCEPT_FUNCTION(wmemcpy);
1535 INTERCEPT_FUNCTION(wmempcpy);
1536 INTERCEPT_FUNCTION(wmemmove);
1537 INTERCEPT_FUNCTION(strcpy); // NOLINT
1538 INTERCEPT_FUNCTION(stpcpy); // NOLINT
1539 INTERCEPT_FUNCTION(strdup);
1540 MSAN_MAYBE_INTERCEPT___STRDUP;
1541 INTERCEPT_FUNCTION(strndup);
1542 MSAN_MAYBE_INTERCEPT___STRNDUP;
1543 INTERCEPT_FUNCTION(strncpy); // NOLINT
1544 INTERCEPT_FUNCTION(gcvt);
1545 INTERCEPT_FUNCTION(strcat); // NOLINT
1546 INTERCEPT_FUNCTION(strncat); // NOLINT
1547 INTERCEPT_STRTO(strtod);
1548 INTERCEPT_STRTO(strtof);
1549 INTERCEPT_STRTO(strtold);
1550 INTERCEPT_STRTO(strtol);
1551 INTERCEPT_STRTO(strtoul);
1552 INTERCEPT_STRTO(strtoll);
1553 INTERCEPT_STRTO(strtoull);
1554 INTERCEPT_STRTO(wcstod);
1555 INTERCEPT_STRTO(wcstof);
1556 INTERCEPT_STRTO(wcstold);
1557 INTERCEPT_STRTO(wcstol);
1558 INTERCEPT_STRTO(wcstoul);
1559 INTERCEPT_STRTO(wcstoll);
1560 INTERCEPT_STRTO(wcstoull);
1561 #ifdef SANITIZER_NLDBL_VERSION
1562 INTERCEPT_FUNCTION_VER(vswprintf, SANITIZER_NLDBL_VERSION);
1563 INTERCEPT_FUNCTION_VER(swprintf, SANITIZER_NLDBL_VERSION);
1565 INTERCEPT_FUNCTION(vswprintf);
1566 INTERCEPT_FUNCTION(swprintf);
1568 INTERCEPT_FUNCTION(strxfrm);
1569 INTERCEPT_FUNCTION(strxfrm_l);
1570 INTERCEPT_FUNCTION(strftime);
1571 INTERCEPT_FUNCTION(strftime_l);
1572 MSAN_MAYBE_INTERCEPT___STRFTIME_L;
1573 INTERCEPT_FUNCTION(wcsftime);
1574 INTERCEPT_FUNCTION(wcsftime_l);
1575 MSAN_MAYBE_INTERCEPT___WCSFTIME_L;
1576 INTERCEPT_FUNCTION(mbtowc);
1577 INTERCEPT_FUNCTION(mbrtowc);
1578 INTERCEPT_FUNCTION(wcslen);
1579 INTERCEPT_FUNCTION(wcsnlen);
1580 INTERCEPT_FUNCTION(wcschr);
1581 INTERCEPT_FUNCTION(wcscpy);
1582 INTERCEPT_FUNCTION(wcsncpy);
1583 INTERCEPT_FUNCTION(wcscmp);
1584 INTERCEPT_FUNCTION(getenv);
1585 INTERCEPT_FUNCTION(setenv);
1586 INTERCEPT_FUNCTION(putenv);
1587 INTERCEPT_FUNCTION(gettimeofday);
1588 INTERCEPT_FUNCTION(fcvt);
1589 MSAN_MAYBE_INTERCEPT___FXSTAT;
1590 MSAN_INTERCEPT_FSTATAT;
1591 MSAN_MAYBE_INTERCEPT___FXSTAT64;
1592 MSAN_MAYBE_INTERCEPT___FXSTATAT64;
1593 INTERCEPT_FUNCTION(pipe);
1594 INTERCEPT_FUNCTION(pipe2);
1595 INTERCEPT_FUNCTION(socketpair);
1596 INTERCEPT_FUNCTION(fgets);
1597 MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED;
1598 INTERCEPT_FUNCTION(getrlimit);
1599 MSAN_MAYBE_INTERCEPT_GETRLIMIT64;
1600 MSAN_MAYBE_INTERCEPT_PRLIMIT;
1601 MSAN_MAYBE_INTERCEPT_PRLIMIT64;
1602 MSAN_INTERCEPT_UNAME;
1603 INTERCEPT_FUNCTION(gethostname);
1604 MSAN_MAYBE_INTERCEPT_EPOLL_WAIT;
1605 MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT;
1606 INTERCEPT_FUNCTION(dladdr);
1607 INTERCEPT_FUNCTION(dlerror);
1608 INTERCEPT_FUNCTION(dl_iterate_phdr);
1609 INTERCEPT_FUNCTION(getrusage);
1610 INTERCEPT_FUNCTION(sigaction);
1611 INTERCEPT_FUNCTION(signal);
1612 #if defined(__mips__)
1613 INTERCEPT_FUNCTION_VER(pthread_create, "GLIBC_2.2");
1615 INTERCEPT_FUNCTION(pthread_create);
1617 INTERCEPT_FUNCTION(pthread_key_create);
1618 INTERCEPT_FUNCTION(pthread_join);
1619 INTERCEPT_FUNCTION(tzset);
1620 INTERCEPT_FUNCTION(__cxa_atexit);
1621 INTERCEPT_FUNCTION(shmat);
1622 INTERCEPT_FUNCTION(fork);
1623 INTERCEPT_FUNCTION(openpty);
1624 INTERCEPT_FUNCTION(forkpty);
1628 } // namespace __msan