1 //===-- msan_interceptors.cpp ---------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file is a part of MemorySanitizer.
10 //
11 // Interceptors for standard library functions.
12 //
13 // FIXME: move as many interceptors as possible into
14 // sanitizer_common/sanitizer_common_interceptors.h
15 //===----------------------------------------------------------------------===//
16
17 #include "interception/interception.h"
18 #include "msan.h"
19 #include "msan_chained_origin_depot.h"
20 #include "msan_origin.h"
21 #include "msan_report.h"
22 #include "msan_thread.h"
23 #include "msan_poisoning.h"
24 #include "sanitizer_common/sanitizer_errno_codes.h"
25 #include "sanitizer_common/sanitizer_platform_limits_posix.h"
26 #include "sanitizer_common/sanitizer_platform_limits_netbsd.h"
27 #include "sanitizer_common/sanitizer_allocator.h"
28 #include "sanitizer_common/sanitizer_allocator_interface.h"
29 #include "sanitizer_common/sanitizer_allocator_internal.h"
30 #include "sanitizer_common/sanitizer_atomic.h"
31 #include "sanitizer_common/sanitizer_common.h"
32 #include "sanitizer_common/sanitizer_errno.h"
33 #include "sanitizer_common/sanitizer_stackdepot.h"
34 #include "sanitizer_common/sanitizer_libc.h"
35 #include "sanitizer_common/sanitizer_linux.h"
36 #include "sanitizer_common/sanitizer_tls_get_addr.h"
37 #include "sanitizer_common/sanitizer_vector.h"
38
39 #if SANITIZER_NETBSD
40 #define fstat __fstat50
41 #define gettimeofday __gettimeofday50
42 #define getrusage __getrusage50
43 #define tzset __tzset50
44 #endif
45
46 #include <stdarg.h>
47 // ACHTUNG! No other system header includes in this file.
48 // Ideally, we should get rid of stdarg.h as well.
49
50 using namespace __msan;
51
52 using __sanitizer::memory_order;
53 using __sanitizer::atomic_load;
54 using __sanitizer::atomic_store;
55 using __sanitizer::atomic_uintptr_t;
56
57 DECLARE_REAL(SIZE_T, strlen, const char *s)
58 DECLARE_REAL(SIZE_T, strnlen, const char *s, SIZE_T maxlen)
59 DECLARE_REAL(void *, memcpy, void *dest, const void *src, uptr n)
60 DECLARE_REAL(void *, memset, void *dest, int c, uptr n)
61
62 // True if this is a nested interceptor.
63 static THREADLOCAL int in_interceptor_scope;
64
__msan_scoped_disable_interceptor_checks()65 void __msan_scoped_disable_interceptor_checks() { ++in_interceptor_scope; }
__msan_scoped_enable_interceptor_checks()66 void __msan_scoped_enable_interceptor_checks() { --in_interceptor_scope; }
67
68 struct InterceptorScope {
InterceptorScopeInterceptorScope69 InterceptorScope() { ++in_interceptor_scope; }
~InterceptorScopeInterceptorScope70 ~InterceptorScope() { --in_interceptor_scope; }
71 };
72
IsInInterceptorScope()73 bool IsInInterceptorScope() {
74 return in_interceptor_scope;
75 }
76
77 static uptr allocated_for_dlsym;
78 static const uptr kDlsymAllocPoolSize = 1024;
79 static uptr alloc_memory_for_dlsym[kDlsymAllocPoolSize];
80
IsInDlsymAllocPool(const void * ptr)81 static bool IsInDlsymAllocPool(const void *ptr) {
82 uptr off = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
83 return off < sizeof(alloc_memory_for_dlsym);
84 }
85
AllocateFromLocalPool(uptr size_in_bytes)86 static void *AllocateFromLocalPool(uptr size_in_bytes) {
87 uptr size_in_words = RoundUpTo(size_in_bytes, kWordSize) / kWordSize;
88 void *mem = (void *)&alloc_memory_for_dlsym[allocated_for_dlsym];
89 allocated_for_dlsym += size_in_words;
90 CHECK_LT(allocated_for_dlsym, kDlsymAllocPoolSize);
91 return mem;
92 }
93
94 #define ENSURE_MSAN_INITED() do { \
95 CHECK(!msan_init_is_running); \
96 if (!msan_inited) { \
97 __msan_init(); \
98 } \
99 } while (0)
100
101 // Check that [x, x+n) range is unpoisoned.
102 #define CHECK_UNPOISONED_0(x, n) \
103 do { \
104 sptr __offset = __msan_test_shadow(x, n); \
105 if (__msan::IsInSymbolizer()) break; \
106 if (__offset >= 0 && __msan::flags()->report_umrs) { \
107 GET_CALLER_PC_BP_SP; \
108 (void)sp; \
109 ReportUMRInsideAddressRange(__func__, x, n, __offset); \
110 __msan::PrintWarningWithOrigin( \
111 pc, bp, __msan_get_origin((const char *)x + __offset)); \
112 if (__msan::flags()->halt_on_error) { \
113 Printf("Exiting\n"); \
114 Die(); \
115 } \
116 } \
117 } while (0)
118
119 // Check that [x, x+n) range is unpoisoned unless we are in a nested
120 // interceptor.
121 #define CHECK_UNPOISONED(x, n) \
122 do { \
123 if (!IsInInterceptorScope()) CHECK_UNPOISONED_0(x, n); \
124 } while (0)
125
126 #define CHECK_UNPOISONED_STRING_OF_LEN(x, len, n) \
127 CHECK_UNPOISONED((x), \
128 common_flags()->strict_string_checks ? (len) + 1 : (n) )
129
130 #define CHECK_UNPOISONED_STRING(x, n) \
131 CHECK_UNPOISONED_STRING_OF_LEN((x), internal_strlen(x), (n))
132
133 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(SIZE_T,fread_unlocked,void * ptr,SIZE_T size,SIZE_T nmemb,void * file)134 INTERCEPTOR(SIZE_T, fread_unlocked, void *ptr, SIZE_T size, SIZE_T nmemb,
135 void *file) {
136 ENSURE_MSAN_INITED();
137 SIZE_T res = REAL(fread_unlocked)(ptr, size, nmemb, file);
138 if (res > 0)
139 __msan_unpoison(ptr, res *size);
140 return res;
141 }
142 #define MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED INTERCEPT_FUNCTION(fread_unlocked)
143 #else
144 #define MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED
145 #endif
146
147 #if !SANITIZER_NETBSD
INTERCEPTOR(void *,mempcpy,void * dest,const void * src,SIZE_T n)148 INTERCEPTOR(void *, mempcpy, void *dest, const void *src, SIZE_T n) {
149 return (char *)__msan_memcpy(dest, src, n) + n;
150 }
151 #define MSAN_MAYBE_INTERCEPT_MEMPCPY INTERCEPT_FUNCTION(mempcpy)
152 #else
153 #define MSAN_MAYBE_INTERCEPT_MEMPCPY
154 #endif
155
INTERCEPTOR(void *,memccpy,void * dest,const void * src,int c,SIZE_T n)156 INTERCEPTOR(void *, memccpy, void *dest, const void *src, int c, SIZE_T n) {
157 ENSURE_MSAN_INITED();
158 void *res = REAL(memccpy)(dest, src, c, n);
159 CHECK(!res || (res >= dest && res <= (char *)dest + n));
160 SIZE_T sz = res ? (char *)res - (char *)dest : n;
161 CHECK_UNPOISONED(src, sz);
162 __msan_unpoison(dest, sz);
163 return res;
164 }
165
INTERCEPTOR(void *,bcopy,const void * src,void * dest,SIZE_T n)166 INTERCEPTOR(void *, bcopy, const void *src, void *dest, SIZE_T n) {
167 return __msan_memmove(dest, src, n);
168 }
169
INTERCEPTOR(int,posix_memalign,void ** memptr,SIZE_T alignment,SIZE_T size)170 INTERCEPTOR(int, posix_memalign, void **memptr, SIZE_T alignment, SIZE_T size) {
171 GET_MALLOC_STACK_TRACE;
172 CHECK_NE(memptr, 0);
173 int res = msan_posix_memalign(memptr, alignment, size, &stack);
174 if (!res)
175 __msan_unpoison(memptr, sizeof(*memptr));
176 return res;
177 }
178
179 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(void *,memalign,SIZE_T alignment,SIZE_T size)180 INTERCEPTOR(void *, memalign, SIZE_T alignment, SIZE_T size) {
181 GET_MALLOC_STACK_TRACE;
182 return msan_memalign(alignment, size, &stack);
183 }
184 #define MSAN_MAYBE_INTERCEPT_MEMALIGN INTERCEPT_FUNCTION(memalign)
185 #else
186 #define MSAN_MAYBE_INTERCEPT_MEMALIGN
187 #endif
188
INTERCEPTOR(void *,aligned_alloc,SIZE_T alignment,SIZE_T size)189 INTERCEPTOR(void *, aligned_alloc, SIZE_T alignment, SIZE_T size) {
190 GET_MALLOC_STACK_TRACE;
191 return msan_aligned_alloc(alignment, size, &stack);
192 }
193
194 #if !SANITIZER_NETBSD
INTERCEPTOR(void *,__libc_memalign,SIZE_T alignment,SIZE_T size)195 INTERCEPTOR(void *, __libc_memalign, SIZE_T alignment, SIZE_T size) {
196 GET_MALLOC_STACK_TRACE;
197 void *ptr = msan_memalign(alignment, size, &stack);
198 if (ptr)
199 DTLS_on_libc_memalign(ptr, size);
200 return ptr;
201 }
202 #define MSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN INTERCEPT_FUNCTION(__libc_memalign)
203 #else
204 #define MSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN
205 #endif
206
INTERCEPTOR(void *,valloc,SIZE_T size)207 INTERCEPTOR(void *, valloc, SIZE_T size) {
208 GET_MALLOC_STACK_TRACE;
209 return msan_valloc(size, &stack);
210 }
211
212 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(void *,pvalloc,SIZE_T size)213 INTERCEPTOR(void *, pvalloc, SIZE_T size) {
214 GET_MALLOC_STACK_TRACE;
215 return msan_pvalloc(size, &stack);
216 }
217 #define MSAN_MAYBE_INTERCEPT_PVALLOC INTERCEPT_FUNCTION(pvalloc)
218 #else
219 #define MSAN_MAYBE_INTERCEPT_PVALLOC
220 #endif
221
INTERCEPTOR(void,free,void * ptr)222 INTERCEPTOR(void, free, void *ptr) {
223 GET_MALLOC_STACK_TRACE;
224 if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
225 MsanDeallocate(&stack, ptr);
226 }
227
228 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(void,cfree,void * ptr)229 INTERCEPTOR(void, cfree, void *ptr) {
230 GET_MALLOC_STACK_TRACE;
231 if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
232 MsanDeallocate(&stack, ptr);
233 }
234 #define MSAN_MAYBE_INTERCEPT_CFREE INTERCEPT_FUNCTION(cfree)
235 #else
236 #define MSAN_MAYBE_INTERCEPT_CFREE
237 #endif
238
239 #if !SANITIZER_NETBSD
INTERCEPTOR(uptr,malloc_usable_size,void * ptr)240 INTERCEPTOR(uptr, malloc_usable_size, void *ptr) {
241 return __sanitizer_get_allocated_size(ptr);
242 }
243 #define MSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE \
244 INTERCEPT_FUNCTION(malloc_usable_size)
245 #else
246 #define MSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE
247 #endif
248
249 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
250 // This function actually returns a struct by value, but we can't unpoison a
251 // temporary! The following is equivalent on all supported platforms but
252 // aarch64 (which uses a different register for sret value). We have a test
253 // to confirm that.
INTERCEPTOR(void,mallinfo,__sanitizer_struct_mallinfo * sret)254 INTERCEPTOR(void, mallinfo, __sanitizer_struct_mallinfo *sret) {
255 #ifdef __aarch64__
256 uptr r8;
257 asm volatile("mov %0,x8" : "=r" (r8));
258 sret = reinterpret_cast<__sanitizer_struct_mallinfo*>(r8);
259 #endif
260 REAL(memset)(sret, 0, sizeof(*sret));
261 __msan_unpoison(sret, sizeof(*sret));
262 }
263 #define MSAN_MAYBE_INTERCEPT_MALLINFO INTERCEPT_FUNCTION(mallinfo)
264 #else
265 #define MSAN_MAYBE_INTERCEPT_MALLINFO
266 #endif
267
268 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(int,mallopt,int cmd,int value)269 INTERCEPTOR(int, mallopt, int cmd, int value) {
270 return 0;
271 }
272 #define MSAN_MAYBE_INTERCEPT_MALLOPT INTERCEPT_FUNCTION(mallopt)
273 #else
274 #define MSAN_MAYBE_INTERCEPT_MALLOPT
275 #endif
276
277 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(void,malloc_stats,void)278 INTERCEPTOR(void, malloc_stats, void) {
279 // FIXME: implement, but don't call REAL(malloc_stats)!
280 }
281 #define MSAN_MAYBE_INTERCEPT_MALLOC_STATS INTERCEPT_FUNCTION(malloc_stats)
282 #else
283 #define MSAN_MAYBE_INTERCEPT_MALLOC_STATS
284 #endif
285
INTERCEPTOR(char *,strcpy,char * dest,const char * src)286 INTERCEPTOR(char *, strcpy, char *dest, const char *src) {
287 ENSURE_MSAN_INITED();
288 GET_STORE_STACK_TRACE;
289 SIZE_T n = REAL(strlen)(src);
290 CHECK_UNPOISONED_STRING(src + n, 0);
291 char *res = REAL(strcpy)(dest, src);
292 CopyShadowAndOrigin(dest, src, n + 1, &stack);
293 return res;
294 }
295
INTERCEPTOR(char *,strncpy,char * dest,const char * src,SIZE_T n)296 INTERCEPTOR(char *, strncpy, char *dest, const char *src, SIZE_T n) {
297 ENSURE_MSAN_INITED();
298 GET_STORE_STACK_TRACE;
299 SIZE_T copy_size = REAL(strnlen)(src, n);
300 if (copy_size < n)
301 copy_size++; // trailing \0
302 char *res = REAL(strncpy)(dest, src, n);
303 CopyShadowAndOrigin(dest, src, copy_size, &stack);
304 __msan_unpoison(dest + copy_size, n - copy_size);
305 return res;
306 }
307
308 #if !SANITIZER_NETBSD
INTERCEPTOR(char *,stpcpy,char * dest,const char * src)309 INTERCEPTOR(char *, stpcpy, char *dest, const char *src) {
310 ENSURE_MSAN_INITED();
311 GET_STORE_STACK_TRACE;
312 SIZE_T n = REAL(strlen)(src);
313 CHECK_UNPOISONED_STRING(src + n, 0);
314 char *res = REAL(stpcpy)(dest, src);
315 CopyShadowAndOrigin(dest, src, n + 1, &stack);
316 return res;
317 }
318 #define MSAN_MAYBE_INTERCEPT_STPCPY INTERCEPT_FUNCTION(stpcpy)
319 #else
320 #define MSAN_MAYBE_INTERCEPT_STPCPY
321 #endif
322
INTERCEPTOR(char *,strdup,char * src)323 INTERCEPTOR(char *, strdup, char *src) {
324 ENSURE_MSAN_INITED();
325 GET_STORE_STACK_TRACE;
326 // On FreeBSD strdup() leverages strlen().
327 InterceptorScope interceptor_scope;
328 SIZE_T n = REAL(strlen)(src);
329 CHECK_UNPOISONED_STRING(src + n, 0);
330 char *res = REAL(strdup)(src);
331 CopyShadowAndOrigin(res, src, n + 1, &stack);
332 return res;
333 }
334
335 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(char *,__strdup,char * src)336 INTERCEPTOR(char *, __strdup, char *src) {
337 ENSURE_MSAN_INITED();
338 GET_STORE_STACK_TRACE;
339 SIZE_T n = REAL(strlen)(src);
340 CHECK_UNPOISONED_STRING(src + n, 0);
341 char *res = REAL(__strdup)(src);
342 CopyShadowAndOrigin(res, src, n + 1, &stack);
343 return res;
344 }
345 #define MSAN_MAYBE_INTERCEPT___STRDUP INTERCEPT_FUNCTION(__strdup)
346 #else
347 #define MSAN_MAYBE_INTERCEPT___STRDUP
348 #endif
349
350 #if !SANITIZER_NETBSD
INTERCEPTOR(char *,gcvt,double number,SIZE_T ndigit,char * buf)351 INTERCEPTOR(char *, gcvt, double number, SIZE_T ndigit, char *buf) {
352 ENSURE_MSAN_INITED();
353 char *res = REAL(gcvt)(number, ndigit, buf);
354 SIZE_T n = REAL(strlen)(buf);
355 __msan_unpoison(buf, n + 1);
356 return res;
357 }
358 #define MSAN_MAYBE_INTERCEPT_GCVT INTERCEPT_FUNCTION(gcvt)
359 #else
360 #define MSAN_MAYBE_INTERCEPT_GCVT
361 #endif
362
INTERCEPTOR(char *,strcat,char * dest,const char * src)363 INTERCEPTOR(char *, strcat, char *dest, const char *src) {
364 ENSURE_MSAN_INITED();
365 GET_STORE_STACK_TRACE;
366 SIZE_T src_size = REAL(strlen)(src);
367 SIZE_T dest_size = REAL(strlen)(dest);
368 CHECK_UNPOISONED_STRING(src + src_size, 0);
369 CHECK_UNPOISONED_STRING(dest + dest_size, 0);
370 char *res = REAL(strcat)(dest, src);
371 CopyShadowAndOrigin(dest + dest_size, src, src_size + 1, &stack);
372 return res;
373 }
374
INTERCEPTOR(char *,strncat,char * dest,const char * src,SIZE_T n)375 INTERCEPTOR(char *, strncat, char *dest, const char *src, SIZE_T n) {
376 ENSURE_MSAN_INITED();
377 GET_STORE_STACK_TRACE;
378 SIZE_T dest_size = REAL(strlen)(dest);
379 SIZE_T copy_size = REAL(strnlen)(src, n);
380 CHECK_UNPOISONED_STRING(dest + dest_size, 0);
381 char *res = REAL(strncat)(dest, src, n);
382 CopyShadowAndOrigin(dest + dest_size, src, copy_size, &stack);
383 __msan_unpoison(dest + dest_size + copy_size, 1); // \0
384 return res;
385 }
386
387 // Hack: always pass nptr and endptr as part of __VA_ARGS_ to avoid having to
388 // deal with empty __VA_ARGS__ in the case of INTERCEPTOR_STRTO.
389 #define INTERCEPTOR_STRTO_BODY(ret_type, func, ...) \
390 ENSURE_MSAN_INITED(); \
391 ret_type res = REAL(func)(__VA_ARGS__); \
392 __msan_unpoison(endptr, sizeof(*endptr)); \
393 return res;
394
395 #define INTERCEPTOR_STRTO(ret_type, func, char_type) \
396 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr) { \
397 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr); \
398 }
399
400 #define INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
401 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
402 int base) { \
403 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base); \
404 }
405
406 #define INTERCEPTOR_STRTO_LOC(ret_type, func, char_type) \
407 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
408 void *loc) { \
409 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, loc); \
410 }
411
412 #define INTERCEPTOR_STRTO_BASE_LOC(ret_type, func, char_type) \
413 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \
414 int base, void *loc) { \
415 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base, loc); \
416 }
417
418 #if SANITIZER_NETBSD
419 #define INTERCEPTORS_STRTO(ret_type, func, char_type) \
420 INTERCEPTOR_STRTO(ret_type, func, char_type) \
421 INTERCEPTOR_STRTO_LOC(ret_type, func##_l, char_type)
422
423 #define INTERCEPTORS_STRTO_BASE(ret_type, func, char_type) \
424 INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
425 INTERCEPTOR_STRTO_BASE_LOC(ret_type, func##_l, char_type)
426
427 #else
428 #define INTERCEPTORS_STRTO(ret_type, func, char_type) \
429 INTERCEPTOR_STRTO(ret_type, func, char_type) \
430 INTERCEPTOR_STRTO_LOC(ret_type, func##_l, char_type) \
431 INTERCEPTOR_STRTO_LOC(ret_type, __##func##_l, char_type) \
432 INTERCEPTOR_STRTO_LOC(ret_type, __##func##_internal, char_type)
433
434 #define INTERCEPTORS_STRTO_BASE(ret_type, func, char_type) \
435 INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \
436 INTERCEPTOR_STRTO_BASE_LOC(ret_type, func##_l, char_type) \
437 INTERCEPTOR_STRTO_BASE_LOC(ret_type, __##func##_l, char_type) \
438 INTERCEPTOR_STRTO_BASE_LOC(ret_type, __##func##_internal, char_type)
439 #endif
440
INTERCEPTORS_STRTO(double,strtod,char)441 INTERCEPTORS_STRTO(double, strtod, char)
442 INTERCEPTORS_STRTO(float, strtof, char)
443 INTERCEPTORS_STRTO(long double, strtold, char)
444 INTERCEPTORS_STRTO_BASE(long, strtol, char)
445 INTERCEPTORS_STRTO_BASE(long long, strtoll, char)
446 INTERCEPTORS_STRTO_BASE(unsigned long, strtoul, char)
447 INTERCEPTORS_STRTO_BASE(unsigned long long, strtoull, char)
448 INTERCEPTORS_STRTO_BASE(u64, strtouq, char)
449
450 INTERCEPTORS_STRTO(double, wcstod, wchar_t)
451 INTERCEPTORS_STRTO(float, wcstof, wchar_t)
452 INTERCEPTORS_STRTO(long double, wcstold, wchar_t)
453 INTERCEPTORS_STRTO_BASE(long, wcstol, wchar_t)
454 INTERCEPTORS_STRTO_BASE(long long, wcstoll, wchar_t)
455 INTERCEPTORS_STRTO_BASE(unsigned long, wcstoul, wchar_t)
456 INTERCEPTORS_STRTO_BASE(unsigned long long, wcstoull, wchar_t)
457
458 #if SANITIZER_NETBSD
459 #define INTERCEPT_STRTO(func) \
460 INTERCEPT_FUNCTION(func); \
461 INTERCEPT_FUNCTION(func##_l);
462 #else
463 #define INTERCEPT_STRTO(func) \
464 INTERCEPT_FUNCTION(func); \
465 INTERCEPT_FUNCTION(func##_l); \
466 INTERCEPT_FUNCTION(__##func##_l); \
467 INTERCEPT_FUNCTION(__##func##_internal);
468 #endif
469
470
471 // FIXME: support *wprintf in common format interceptors.
472 INTERCEPTOR(int, vswprintf, void *str, uptr size, void *format, va_list ap) {
473 ENSURE_MSAN_INITED();
474 int res = REAL(vswprintf)(str, size, format, ap);
475 if (res >= 0) {
476 __msan_unpoison(str, 4 * (res + 1));
477 }
478 return res;
479 }
480
INTERCEPTOR(int,swprintf,void * str,uptr size,void * format,...)481 INTERCEPTOR(int, swprintf, void *str, uptr size, void *format, ...) {
482 ENSURE_MSAN_INITED();
483 va_list ap;
484 va_start(ap, format);
485 int res = vswprintf(str, size, format, ap);
486 va_end(ap);
487 return res;
488 }
489
490 #define INTERCEPTOR_STRFTIME_BODY(char_type, ret_type, func, s, ...) \
491 ENSURE_MSAN_INITED(); \
492 InterceptorScope interceptor_scope; \
493 ret_type res = REAL(func)(s, __VA_ARGS__); \
494 if (s) __msan_unpoison(s, sizeof(char_type) * (res + 1)); \
495 return res;
496
INTERCEPTOR(SIZE_T,strftime,char * s,SIZE_T max,const char * format,__sanitizer_tm * tm)497 INTERCEPTOR(SIZE_T, strftime, char *s, SIZE_T max, const char *format,
498 __sanitizer_tm *tm) {
499 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, strftime, s, max, format, tm);
500 }
501
INTERCEPTOR(SIZE_T,strftime_l,char * s,SIZE_T max,const char * format,__sanitizer_tm * tm,void * loc)502 INTERCEPTOR(SIZE_T, strftime_l, char *s, SIZE_T max, const char *format,
503 __sanitizer_tm *tm, void *loc) {
504 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, strftime_l, s, max, format, tm, loc);
505 }
506
507 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(SIZE_T,__strftime_l,char * s,SIZE_T max,const char * format,__sanitizer_tm * tm,void * loc)508 INTERCEPTOR(SIZE_T, __strftime_l, char *s, SIZE_T max, const char *format,
509 __sanitizer_tm *tm, void *loc) {
510 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, __strftime_l, s, max, format, tm,
511 loc);
512 }
513 #define MSAN_MAYBE_INTERCEPT___STRFTIME_L INTERCEPT_FUNCTION(__strftime_l)
514 #else
515 #define MSAN_MAYBE_INTERCEPT___STRFTIME_L
516 #endif
517
INTERCEPTOR(SIZE_T,wcsftime,wchar_t * s,SIZE_T max,const wchar_t * format,__sanitizer_tm * tm)518 INTERCEPTOR(SIZE_T, wcsftime, wchar_t *s, SIZE_T max, const wchar_t *format,
519 __sanitizer_tm *tm) {
520 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, wcsftime, s, max, format, tm);
521 }
522
INTERCEPTOR(SIZE_T,wcsftime_l,wchar_t * s,SIZE_T max,const wchar_t * format,__sanitizer_tm * tm,void * loc)523 INTERCEPTOR(SIZE_T, wcsftime_l, wchar_t *s, SIZE_T max, const wchar_t *format,
524 __sanitizer_tm *tm, void *loc) {
525 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, wcsftime_l, s, max, format, tm,
526 loc);
527 }
528
529 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(SIZE_T,__wcsftime_l,wchar_t * s,SIZE_T max,const wchar_t * format,__sanitizer_tm * tm,void * loc)530 INTERCEPTOR(SIZE_T, __wcsftime_l, wchar_t *s, SIZE_T max, const wchar_t *format,
531 __sanitizer_tm *tm, void *loc) {
532 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, __wcsftime_l, s, max, format, tm,
533 loc);
534 }
535 #define MSAN_MAYBE_INTERCEPT___WCSFTIME_L INTERCEPT_FUNCTION(__wcsftime_l)
536 #else
537 #define MSAN_MAYBE_INTERCEPT___WCSFTIME_L
538 #endif
539
INTERCEPTOR(int,mbtowc,wchar_t * dest,const char * src,SIZE_T n)540 INTERCEPTOR(int, mbtowc, wchar_t *dest, const char *src, SIZE_T n) {
541 ENSURE_MSAN_INITED();
542 int res = REAL(mbtowc)(dest, src, n);
543 if (res != -1 && dest) __msan_unpoison(dest, sizeof(wchar_t));
544 return res;
545 }
546
INTERCEPTOR(SIZE_T,mbrtowc,wchar_t * dest,const char * src,SIZE_T n,void * ps)547 INTERCEPTOR(SIZE_T, mbrtowc, wchar_t *dest, const char *src, SIZE_T n,
548 void *ps) {
549 ENSURE_MSAN_INITED();
550 SIZE_T res = REAL(mbrtowc)(dest, src, n, ps);
551 if (res != (SIZE_T)-1 && dest) __msan_unpoison(dest, sizeof(wchar_t));
552 return res;
553 }
554
555 // wchar_t *wmemcpy(wchar_t *dest, const wchar_t *src, SIZE_T n);
INTERCEPTOR(wchar_t *,wmemcpy,wchar_t * dest,const wchar_t * src,SIZE_T n)556 INTERCEPTOR(wchar_t *, wmemcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
557 ENSURE_MSAN_INITED();
558 GET_STORE_STACK_TRACE;
559 wchar_t *res = REAL(wmemcpy)(dest, src, n);
560 CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
561 return res;
562 }
563
564 #if !SANITIZER_NETBSD
INTERCEPTOR(wchar_t *,wmempcpy,wchar_t * dest,const wchar_t * src,SIZE_T n)565 INTERCEPTOR(wchar_t *, wmempcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
566 ENSURE_MSAN_INITED();
567 GET_STORE_STACK_TRACE;
568 wchar_t *res = REAL(wmempcpy)(dest, src, n);
569 CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
570 return res;
571 }
572 #define MSAN_MAYBE_INTERCEPT_WMEMPCPY INTERCEPT_FUNCTION(wmempcpy)
573 #else
574 #define MSAN_MAYBE_INTERCEPT_WMEMPCPY
575 #endif
576
INTERCEPTOR(wchar_t *,wmemset,wchar_t * s,wchar_t c,SIZE_T n)577 INTERCEPTOR(wchar_t *, wmemset, wchar_t *s, wchar_t c, SIZE_T n) {
578 CHECK(MEM_IS_APP(s));
579 ENSURE_MSAN_INITED();
580 wchar_t *res = REAL(wmemset)(s, c, n);
581 __msan_unpoison(s, n * sizeof(wchar_t));
582 return res;
583 }
584
INTERCEPTOR(wchar_t *,wmemmove,wchar_t * dest,const wchar_t * src,SIZE_T n)585 INTERCEPTOR(wchar_t *, wmemmove, wchar_t *dest, const wchar_t *src, SIZE_T n) {
586 ENSURE_MSAN_INITED();
587 GET_STORE_STACK_TRACE;
588 wchar_t *res = REAL(wmemmove)(dest, src, n);
589 MoveShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
590 return res;
591 }
592
INTERCEPTOR(int,wcscmp,const wchar_t * s1,const wchar_t * s2)593 INTERCEPTOR(int, wcscmp, const wchar_t *s1, const wchar_t *s2) {
594 ENSURE_MSAN_INITED();
595 int res = REAL(wcscmp)(s1, s2);
596 return res;
597 }
598
INTERCEPTOR(int,gettimeofday,void * tv,void * tz)599 INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
600 ENSURE_MSAN_INITED();
601 int res = REAL(gettimeofday)(tv, tz);
602 if (tv)
603 __msan_unpoison(tv, 16);
604 if (tz)
605 __msan_unpoison(tz, 8);
606 return res;
607 }
608
609 #if !SANITIZER_NETBSD
INTERCEPTOR(char *,fcvt,double x,int a,int * b,int * c)610 INTERCEPTOR(char *, fcvt, double x, int a, int *b, int *c) {
611 ENSURE_MSAN_INITED();
612 char *res = REAL(fcvt)(x, a, b, c);
613 __msan_unpoison(b, sizeof(*b));
614 __msan_unpoison(c, sizeof(*c));
615 if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
616 return res;
617 }
618 #define MSAN_MAYBE_INTERCEPT_FCVT INTERCEPT_FUNCTION(fcvt)
619 #else
620 #define MSAN_MAYBE_INTERCEPT_FCVT
621 #endif
622
INTERCEPTOR(char *,getenv,char * name)623 INTERCEPTOR(char *, getenv, char *name) {
624 if (msan_init_is_running)
625 return REAL(getenv)(name);
626 ENSURE_MSAN_INITED();
627 char *res = REAL(getenv)(name);
628 if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
629 return res;
630 }
631
632 extern char **environ;
633
UnpoisonEnviron()634 static void UnpoisonEnviron() {
635 char **envp = environ;
636 for (; *envp; ++envp) {
637 __msan_unpoison(envp, sizeof(*envp));
638 __msan_unpoison(*envp, REAL(strlen)(*envp) + 1);
639 }
640 // Trailing NULL pointer.
641 __msan_unpoison(envp, sizeof(*envp));
642 }
643
INTERCEPTOR(int,setenv,const char * name,const char * value,int overwrite)644 INTERCEPTOR(int, setenv, const char *name, const char *value, int overwrite) {
645 ENSURE_MSAN_INITED();
646 CHECK_UNPOISONED_STRING(name, 0);
647 int res = REAL(setenv)(name, value, overwrite);
648 if (!res) UnpoisonEnviron();
649 return res;
650 }
651
INTERCEPTOR(int,putenv,char * string)652 INTERCEPTOR(int, putenv, char *string) {
653 ENSURE_MSAN_INITED();
654 int res = REAL(putenv)(string);
655 if (!res) UnpoisonEnviron();
656 return res;
657 }
658
659 #if SANITIZER_FREEBSD || SANITIZER_NETBSD
INTERCEPTOR(int,fstat,int fd,void * buf)660 INTERCEPTOR(int, fstat, int fd, void *buf) {
661 ENSURE_MSAN_INITED();
662 int res = REAL(fstat)(fd, buf);
663 if (!res)
664 __msan_unpoison(buf, __sanitizer::struct_stat_sz);
665 return res;
666 }
667 #define MSAN_MAYBE_INTERCEPT_FSTAT INTERCEPT_FUNCTION(fstat)
668 #else
669 #define MSAN_MAYBE_INTERCEPT_FSTAT
670 #endif
671
672 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(int,__fxstat,int magic,int fd,void * buf)673 INTERCEPTOR(int, __fxstat, int magic, int fd, void *buf) {
674 ENSURE_MSAN_INITED();
675 int res = REAL(__fxstat)(magic, fd, buf);
676 if (!res)
677 __msan_unpoison(buf, __sanitizer::struct_stat_sz);
678 return res;
679 }
680 #define MSAN_MAYBE_INTERCEPT___FXSTAT INTERCEPT_FUNCTION(__fxstat)
681 #else
682 #define MSAN_MAYBE_INTERCEPT___FXSTAT
683 #endif
684
685 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(int,__fxstat64,int magic,int fd,void * buf)686 INTERCEPTOR(int, __fxstat64, int magic, int fd, void *buf) {
687 ENSURE_MSAN_INITED();
688 int res = REAL(__fxstat64)(magic, fd, buf);
689 if (!res)
690 __msan_unpoison(buf, __sanitizer::struct_stat64_sz);
691 return res;
692 }
693 #define MSAN_MAYBE_INTERCEPT___FXSTAT64 INTERCEPT_FUNCTION(__fxstat64)
694 #else
695 #define MSAN_MAYBE_INTERCEPT___FXSTAT64
696 #endif
697
698 #if SANITIZER_FREEBSD || SANITIZER_NETBSD
INTERCEPTOR(int,fstatat,int fd,char * pathname,void * buf,int flags)699 INTERCEPTOR(int, fstatat, int fd, char *pathname, void *buf, int flags) {
700 ENSURE_MSAN_INITED();
701 int res = REAL(fstatat)(fd, pathname, buf, flags);
702 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz);
703 return res;
704 }
705 # define MSAN_INTERCEPT_FSTATAT INTERCEPT_FUNCTION(fstatat)
706 #else
INTERCEPTOR(int,__fxstatat,int magic,int fd,char * pathname,void * buf,int flags)707 INTERCEPTOR(int, __fxstatat, int magic, int fd, char *pathname, void *buf,
708 int flags) {
709 ENSURE_MSAN_INITED();
710 int res = REAL(__fxstatat)(magic, fd, pathname, buf, flags);
711 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz);
712 return res;
713 }
714 # define MSAN_INTERCEPT_FSTATAT INTERCEPT_FUNCTION(__fxstatat)
715 #endif
716
717 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(int,__fxstatat64,int magic,int fd,char * pathname,void * buf,int flags)718 INTERCEPTOR(int, __fxstatat64, int magic, int fd, char *pathname, void *buf,
719 int flags) {
720 ENSURE_MSAN_INITED();
721 int res = REAL(__fxstatat64)(magic, fd, pathname, buf, flags);
722 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat64_sz);
723 return res;
724 }
725 #define MSAN_MAYBE_INTERCEPT___FXSTATAT64 INTERCEPT_FUNCTION(__fxstatat64)
726 #else
727 #define MSAN_MAYBE_INTERCEPT___FXSTATAT64
728 #endif
729
INTERCEPTOR(int,pipe,int pipefd[2])730 INTERCEPTOR(int, pipe, int pipefd[2]) {
731 if (msan_init_is_running)
732 return REAL(pipe)(pipefd);
733 ENSURE_MSAN_INITED();
734 int res = REAL(pipe)(pipefd);
735 if (!res)
736 __msan_unpoison(pipefd, sizeof(int[2]));
737 return res;
738 }
739
INTERCEPTOR(int,pipe2,int pipefd[2],int flags)740 INTERCEPTOR(int, pipe2, int pipefd[2], int flags) {
741 ENSURE_MSAN_INITED();
742 int res = REAL(pipe2)(pipefd, flags);
743 if (!res)
744 __msan_unpoison(pipefd, sizeof(int[2]));
745 return res;
746 }
747
INTERCEPTOR(int,socketpair,int domain,int type,int protocol,int sv[2])748 INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int sv[2]) {
749 ENSURE_MSAN_INITED();
750 int res = REAL(socketpair)(domain, type, protocol, sv);
751 if (!res)
752 __msan_unpoison(sv, sizeof(int[2]));
753 return res;
754 }
755
756 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(char *,fgets_unlocked,char * s,int size,void * stream)757 INTERCEPTOR(char *, fgets_unlocked, char *s, int size, void *stream) {
758 ENSURE_MSAN_INITED();
759 char *res = REAL(fgets_unlocked)(s, size, stream);
760 if (res)
761 __msan_unpoison(s, REAL(strlen)(s) + 1);
762 return res;
763 }
764 #define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED INTERCEPT_FUNCTION(fgets_unlocked)
765 #else
766 #define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED
767 #endif
768
769 #define INTERCEPTOR_GETRLIMIT_BODY(func, resource, rlim) \
770 if (msan_init_is_running) \
771 return REAL(getrlimit)(resource, rlim); \
772 ENSURE_MSAN_INITED(); \
773 int res = REAL(func)(resource, rlim); \
774 if (!res) \
775 __msan_unpoison(rlim, __sanitizer::struct_rlimit_sz); \
776 return res
777
INTERCEPTOR(int,getrlimit,int resource,void * rlim)778 INTERCEPTOR(int, getrlimit, int resource, void *rlim) {
779 INTERCEPTOR_GETRLIMIT_BODY(getrlimit, resource, rlim);
780 }
781
782 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(int,__getrlimit,int resource,void * rlim)783 INTERCEPTOR(int, __getrlimit, int resource, void *rlim) {
784 INTERCEPTOR_GETRLIMIT_BODY(__getrlimit, resource, rlim);
785 }
786
INTERCEPTOR(int,getrlimit64,int resource,void * rlim)787 INTERCEPTOR(int, getrlimit64, int resource, void *rlim) {
788 if (msan_init_is_running) return REAL(getrlimit64)(resource, rlim);
789 ENSURE_MSAN_INITED();
790 int res = REAL(getrlimit64)(resource, rlim);
791 if (!res) __msan_unpoison(rlim, __sanitizer::struct_rlimit64_sz);
792 return res;
793 }
794
INTERCEPTOR(int,prlimit,int pid,int resource,void * new_rlimit,void * old_rlimit)795 INTERCEPTOR(int, prlimit, int pid, int resource, void *new_rlimit,
796 void *old_rlimit) {
797 if (msan_init_is_running)
798 return REAL(prlimit)(pid, resource, new_rlimit, old_rlimit);
799 ENSURE_MSAN_INITED();
800 CHECK_UNPOISONED(new_rlimit, __sanitizer::struct_rlimit_sz);
801 int res = REAL(prlimit)(pid, resource, new_rlimit, old_rlimit);
802 if (!res) __msan_unpoison(old_rlimit, __sanitizer::struct_rlimit_sz);
803 return res;
804 }
805
INTERCEPTOR(int,prlimit64,int pid,int resource,void * new_rlimit,void * old_rlimit)806 INTERCEPTOR(int, prlimit64, int pid, int resource, void *new_rlimit,
807 void *old_rlimit) {
808 if (msan_init_is_running)
809 return REAL(prlimit64)(pid, resource, new_rlimit, old_rlimit);
810 ENSURE_MSAN_INITED();
811 CHECK_UNPOISONED(new_rlimit, __sanitizer::struct_rlimit64_sz);
812 int res = REAL(prlimit64)(pid, resource, new_rlimit, old_rlimit);
813 if (!res) __msan_unpoison(old_rlimit, __sanitizer::struct_rlimit64_sz);
814 return res;
815 }
816
817 #define MSAN_MAYBE_INTERCEPT___GETRLIMIT INTERCEPT_FUNCTION(__getrlimit)
818 #define MSAN_MAYBE_INTERCEPT_GETRLIMIT64 INTERCEPT_FUNCTION(getrlimit64)
819 #define MSAN_MAYBE_INTERCEPT_PRLIMIT INTERCEPT_FUNCTION(prlimit)
820 #define MSAN_MAYBE_INTERCEPT_PRLIMIT64 INTERCEPT_FUNCTION(prlimit64)
821 #else
822 #define MSAN_MAYBE_INTERCEPT___GETRLIMIT
823 #define MSAN_MAYBE_INTERCEPT_GETRLIMIT64
824 #define MSAN_MAYBE_INTERCEPT_PRLIMIT
825 #define MSAN_MAYBE_INTERCEPT_PRLIMIT64
826 #endif
827
INTERCEPTOR(int,gethostname,char * name,SIZE_T len)828 INTERCEPTOR(int, gethostname, char *name, SIZE_T len) {
829 ENSURE_MSAN_INITED();
830 int res = REAL(gethostname)(name, len);
831 if (!res || (res == -1 && errno == errno_ENAMETOOLONG)) {
832 SIZE_T real_len = REAL(strnlen)(name, len);
833 if (real_len < len)
834 ++real_len;
835 __msan_unpoison(name, real_len);
836 }
837 return res;
838 }
839
840 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(int,epoll_wait,int epfd,void * events,int maxevents,int timeout)841 INTERCEPTOR(int, epoll_wait, int epfd, void *events, int maxevents,
842 int timeout) {
843 ENSURE_MSAN_INITED();
844 int res = REAL(epoll_wait)(epfd, events, maxevents, timeout);
845 if (res > 0) {
846 __msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res);
847 }
848 return res;
849 }
850 #define MSAN_MAYBE_INTERCEPT_EPOLL_WAIT INTERCEPT_FUNCTION(epoll_wait)
851 #else
852 #define MSAN_MAYBE_INTERCEPT_EPOLL_WAIT
853 #endif
854
855 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
INTERCEPTOR(int,epoll_pwait,int epfd,void * events,int maxevents,int timeout,void * sigmask)856 INTERCEPTOR(int, epoll_pwait, int epfd, void *events, int maxevents,
857 int timeout, void *sigmask) {
858 ENSURE_MSAN_INITED();
859 int res = REAL(epoll_pwait)(epfd, events, maxevents, timeout, sigmask);
860 if (res > 0) {
861 __msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res);
862 }
863 return res;
864 }
865 #define MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT INTERCEPT_FUNCTION(epoll_pwait)
866 #else
867 #define MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT
868 #endif
869
INTERCEPTOR(void *,calloc,SIZE_T nmemb,SIZE_T size)870 INTERCEPTOR(void *, calloc, SIZE_T nmemb, SIZE_T size) {
871 GET_MALLOC_STACK_TRACE;
872 if (UNLIKELY(!msan_inited))
873 // Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym.
874 return AllocateFromLocalPool(nmemb * size);
875 return msan_calloc(nmemb, size, &stack);
876 }
877
INTERCEPTOR(void *,realloc,void * ptr,SIZE_T size)878 INTERCEPTOR(void *, realloc, void *ptr, SIZE_T size) {
879 GET_MALLOC_STACK_TRACE;
880 if (UNLIKELY(IsInDlsymAllocPool(ptr))) {
881 uptr offset = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
882 uptr copy_size = Min(size, kDlsymAllocPoolSize - offset);
883 void *new_ptr;
884 if (UNLIKELY(!msan_inited)) {
885 new_ptr = AllocateFromLocalPool(copy_size);
886 } else {
887 copy_size = size;
888 new_ptr = msan_malloc(copy_size, &stack);
889 }
890 internal_memcpy(new_ptr, ptr, copy_size);
891 return new_ptr;
892 }
893 return msan_realloc(ptr, size, &stack);
894 }
895
INTERCEPTOR(void *,reallocarray,void * ptr,SIZE_T nmemb,SIZE_T size)896 INTERCEPTOR(void *, reallocarray, void *ptr, SIZE_T nmemb, SIZE_T size) {
897 GET_MALLOC_STACK_TRACE;
898 return msan_reallocarray(ptr, nmemb, size, &stack);
899 }
900
INTERCEPTOR(void *,malloc,SIZE_T size)901 INTERCEPTOR(void *, malloc, SIZE_T size) {
902 GET_MALLOC_STACK_TRACE;
903 if (UNLIKELY(!msan_inited))
904 // Hack: dlsym calls malloc before REAL(malloc) is retrieved from dlsym.
905 return AllocateFromLocalPool(size);
906 return msan_malloc(size, &stack);
907 }
908
__msan_allocated_memory(const void * data,uptr size)909 void __msan_allocated_memory(const void *data, uptr size) {
910 GET_MALLOC_STACK_TRACE;
911 if (flags()->poison_in_malloc) {
912 stack.tag = STACK_TRACE_TAG_POISON;
913 PoisonMemory(data, size, &stack);
914 }
915 }
916
__msan_copy_shadow(void * dest,const void * src,uptr n)917 void __msan_copy_shadow(void *dest, const void *src, uptr n) {
918 GET_STORE_STACK_TRACE;
919 MoveShadowAndOrigin(dest, src, n, &stack);
920 }
921
__sanitizer_dtor_callback(const void * data,uptr size)922 void __sanitizer_dtor_callback(const void *data, uptr size) {
923 GET_MALLOC_STACK_TRACE;
924 if (flags()->poison_in_dtor) {
925 stack.tag = STACK_TRACE_TAG_POISON;
926 PoisonMemory(data, size, &stack);
927 }
928 }
929
930 template <class Mmap>
mmap_interceptor(Mmap real_mmap,void * addr,SIZE_T length,int prot,int flags,int fd,OFF64_T offset)931 static void *mmap_interceptor(Mmap real_mmap, void *addr, SIZE_T length,
932 int prot, int flags, int fd, OFF64_T offset) {
933 SIZE_T rounded_length = RoundUpTo(length, GetPageSize());
934 void *end_addr = (char *)addr + (rounded_length - 1);
935 if (addr && (!MEM_IS_APP(addr) || !MEM_IS_APP(end_addr))) {
936 if (flags & map_fixed) {
937 errno = errno_EINVAL;
938 return (void *)-1;
939 } else {
940 addr = nullptr;
941 }
942 }
943 void *res = real_mmap(addr, length, prot, flags, fd, offset);
944 if (res != (void *)-1) {
945 void *end_res = (char *)res + (rounded_length - 1);
946 if (MEM_IS_APP(res) && MEM_IS_APP(end_res)) {
947 __msan_unpoison(res, rounded_length);
948 } else {
949 // Application has attempted to map more memory than is supported by
950 // MSAN. Act as if we ran out of memory.
951 internal_munmap(res, length);
952 errno = errno_ENOMEM;
953 return (void *)-1;
954 }
955 }
956 return res;
957 }
958
INTERCEPTOR(int,getrusage,int who,void * usage)959 INTERCEPTOR(int, getrusage, int who, void *usage) {
960 ENSURE_MSAN_INITED();
961 int res = REAL(getrusage)(who, usage);
962 if (res == 0) {
963 __msan_unpoison(usage, __sanitizer::struct_rusage_sz);
964 }
965 return res;
966 }
967
968 class SignalHandlerScope {
969 public:
SignalHandlerScope()970 SignalHandlerScope() {
971 if (MsanThread *t = GetCurrentThread())
972 t->EnterSignalHandler();
973 }
~SignalHandlerScope()974 ~SignalHandlerScope() {
975 if (MsanThread *t = GetCurrentThread())
976 t->LeaveSignalHandler();
977 }
978 };
979
980 // sigactions_mu guarantees atomicity of sigaction() and signal() calls.
981 // Access to sigactions[] is gone with relaxed atomics to avoid data race with
982 // the signal handler.
983 const int kMaxSignals = 1024;
984 static atomic_uintptr_t sigactions[kMaxSignals];
985 static StaticSpinMutex sigactions_mu;
986
SignalHandler(int signo)987 static void SignalHandler(int signo) {
988 SignalHandlerScope signal_handler_scope;
989 ScopedThreadLocalStateBackup stlsb;
990 UnpoisonParam(1);
991
992 typedef void (*signal_cb)(int x);
993 signal_cb cb =
994 (signal_cb)atomic_load(&sigactions[signo], memory_order_relaxed);
995 cb(signo);
996 }
997
SignalAction(int signo,void * si,void * uc)998 static void SignalAction(int signo, void *si, void *uc) {
999 SignalHandlerScope signal_handler_scope;
1000 ScopedThreadLocalStateBackup stlsb;
1001 UnpoisonParam(3);
1002 __msan_unpoison(si, sizeof(__sanitizer_sigaction));
1003 __msan_unpoison(uc, __sanitizer::ucontext_t_sz);
1004
1005 typedef void (*sigaction_cb)(int, void *, void *);
1006 sigaction_cb cb =
1007 (sigaction_cb)atomic_load(&sigactions[signo], memory_order_relaxed);
1008 cb(signo, si, uc);
1009 }
1010
read_sigaction(const __sanitizer_sigaction * act)1011 static void read_sigaction(const __sanitizer_sigaction *act) {
1012 CHECK_UNPOISONED(&act->sa_flags, sizeof(act->sa_flags));
1013 if (act->sa_flags & __sanitizer::sa_siginfo)
1014 CHECK_UNPOISONED(&act->sigaction, sizeof(act->sigaction));
1015 else
1016 CHECK_UNPOISONED(&act->handler, sizeof(act->handler));
1017 CHECK_UNPOISONED(&act->sa_mask, sizeof(act->sa_mask));
1018 }
1019
1020 extern "C" int pthread_attr_init(void *attr);
1021 extern "C" int pthread_attr_destroy(void *attr);
1022
MsanThreadStartFunc(void * arg)1023 static void *MsanThreadStartFunc(void *arg) {
1024 MsanThread *t = (MsanThread *)arg;
1025 SetCurrentThread(t);
1026 return t->ThreadStart();
1027 }
1028
INTERCEPTOR(int,pthread_create,void * th,void * attr,void * (* callback)(void *),void * param)1029 INTERCEPTOR(int, pthread_create, void *th, void *attr, void *(*callback)(void*),
1030 void * param) {
1031 ENSURE_MSAN_INITED(); // for GetTlsSize()
1032 __sanitizer_pthread_attr_t myattr;
1033 if (!attr) {
1034 pthread_attr_init(&myattr);
1035 attr = &myattr;
1036 }
1037
1038 AdjustStackSize(attr);
1039
1040 MsanThread *t = MsanThread::Create(callback, param);
1041
1042 int res = REAL(pthread_create)(th, attr, MsanThreadStartFunc, t);
1043
1044 if (attr == &myattr)
1045 pthread_attr_destroy(&myattr);
1046 if (!res) {
1047 __msan_unpoison(th, __sanitizer::pthread_t_sz);
1048 }
1049 return res;
1050 }
1051
INTERCEPTOR(int,pthread_key_create,__sanitizer_pthread_key_t * key,void (* dtor)(void * value))1052 INTERCEPTOR(int, pthread_key_create, __sanitizer_pthread_key_t *key,
1053 void (*dtor)(void *value)) {
1054 if (msan_init_is_running) return REAL(pthread_key_create)(key, dtor);
1055 ENSURE_MSAN_INITED();
1056 int res = REAL(pthread_key_create)(key, dtor);
1057 if (!res && key)
1058 __msan_unpoison(key, sizeof(*key));
1059 return res;
1060 }
1061
1062 #if SANITIZER_NETBSD
1063 INTERCEPTOR(int, __libc_thr_keycreate, __sanitizer_pthread_key_t *m,
1064 void (*dtor)(void *value))
1065 ALIAS(WRAPPER_NAME(pthread_key_create));
1066 #endif
1067
INTERCEPTOR(int,pthread_join,void * th,void ** retval)1068 INTERCEPTOR(int, pthread_join, void *th, void **retval) {
1069 ENSURE_MSAN_INITED();
1070 int res = REAL(pthread_join)(th, retval);
1071 if (!res && retval)
1072 __msan_unpoison(retval, sizeof(*retval));
1073 return res;
1074 }
1075
1076 extern char *tzname[2];
1077
INTERCEPTOR(void,tzset,int fake)1078 INTERCEPTOR(void, tzset, int fake) {
1079 ENSURE_MSAN_INITED();
1080 InterceptorScope interceptor_scope;
1081 REAL(tzset)(fake);
1082 if (tzname[0])
1083 __msan_unpoison(tzname[0], REAL(strlen)(tzname[0]) + 1);
1084 if (tzname[1])
1085 __msan_unpoison(tzname[1], REAL(strlen)(tzname[1]) + 1);
1086 return;
1087 }
1088
1089 struct MSanAtExitRecord {
1090 void (*func)(void *arg);
1091 void *arg;
1092 };
1093
1094 struct InterceptorContext {
1095 BlockingMutex atexit_mu;
1096 Vector<struct MSanAtExitRecord *> AtExitStack;
1097
InterceptorContextInterceptorContext1098 InterceptorContext()
1099 : AtExitStack() {
1100 }
1101 };
1102
1103 static ALIGNED(64) char interceptor_placeholder[sizeof(InterceptorContext)];
interceptor_ctx()1104 InterceptorContext *interceptor_ctx() {
1105 return reinterpret_cast<InterceptorContext*>(&interceptor_placeholder[0]);
1106 }
1107
MSanAtExitWrapper()1108 void MSanAtExitWrapper() {
1109 MSanAtExitRecord *r;
1110 {
1111 BlockingMutexLock l(&interceptor_ctx()->atexit_mu);
1112
1113 uptr element = interceptor_ctx()->AtExitStack.Size() - 1;
1114 r = interceptor_ctx()->AtExitStack[element];
1115 interceptor_ctx()->AtExitStack.PopBack();
1116 }
1117
1118 UnpoisonParam(1);
1119 ((void(*)())r->func)();
1120 InternalFree(r);
1121 }
1122
MSanCxaAtExitWrapper(void * arg)1123 void MSanCxaAtExitWrapper(void *arg) {
1124 UnpoisonParam(1);
1125 MSanAtExitRecord *r = (MSanAtExitRecord *)arg;
1126 // libc before 2.27 had race which caused occasional double handler execution
1127 // https://sourceware.org/ml/libc-alpha/2017-08/msg01204.html
1128 if (!r->func)
1129 return;
1130 r->func(r->arg);
1131 r->func = nullptr;
1132 }
1133
1134 static int setup_at_exit_wrapper(void(*f)(), void *arg, void *dso);
1135
1136 // Unpoison argument shadow for C++ module destructors.
INTERCEPTOR(int,__cxa_atexit,void (* func)(void *),void * arg,void * dso_handle)1137 INTERCEPTOR(int, __cxa_atexit, void (*func)(void *), void *arg,
1138 void *dso_handle) {
1139 if (msan_init_is_running) return REAL(__cxa_atexit)(func, arg, dso_handle);
1140 return setup_at_exit_wrapper((void(*)())func, arg, dso_handle);
1141 }
1142
1143 // Unpoison argument shadow for C++ module destructors.
INTERCEPTOR(int,atexit,void (* func)())1144 INTERCEPTOR(int, atexit, void (*func)()) {
1145 // Avoid calling real atexit as it is unrechable on at least on Linux.
1146 if (msan_init_is_running)
1147 return REAL(__cxa_atexit)((void (*)(void *a))func, 0, 0);
1148 return setup_at_exit_wrapper((void(*)())func, 0, 0);
1149 }
1150
setup_at_exit_wrapper(void (* f)(),void * arg,void * dso)1151 static int setup_at_exit_wrapper(void(*f)(), void *arg, void *dso) {
1152 ENSURE_MSAN_INITED();
1153 MSanAtExitRecord *r =
1154 (MSanAtExitRecord *)InternalAlloc(sizeof(MSanAtExitRecord));
1155 r->func = (void(*)(void *a))f;
1156 r->arg = arg;
1157 int res;
1158 if (!dso) {
1159 // NetBSD does not preserve the 2nd argument if dso is equal to 0
1160 // Store ctx in a local stack-like structure
1161
1162 BlockingMutexLock l(&interceptor_ctx()->atexit_mu);
1163
1164 res = REAL(__cxa_atexit)((void (*)(void *a))MSanAtExitWrapper, 0, 0);
1165 if (!res) {
1166 interceptor_ctx()->AtExitStack.PushBack(r);
1167 }
1168 } else {
1169 res = REAL(__cxa_atexit)(MSanCxaAtExitWrapper, r, dso);
1170 }
1171 return res;
1172 }
1173
BeforeFork()1174 static void BeforeFork() {
1175 StackDepotLockAll();
1176 ChainedOriginDepotLockAll();
1177 }
1178
AfterFork()1179 static void AfterFork() {
1180 ChainedOriginDepotUnlockAll();
1181 StackDepotUnlockAll();
1182 }
1183
INTERCEPTOR(int,fork,void)1184 INTERCEPTOR(int, fork, void) {
1185 ENSURE_MSAN_INITED();
1186 BeforeFork();
1187 int pid = REAL(fork)();
1188 AfterFork();
1189 return pid;
1190 }
1191
1192 // NetBSD ships with openpty(3) in -lutil, that needs to be prebuilt explicitly
1193 // with MSan.
1194 #if SANITIZER_LINUX
INTERCEPTOR(int,openpty,int * aparent,int * aworker,char * name,const void * termp,const void * winp)1195 INTERCEPTOR(int, openpty, int *aparent, int *aworker, char *name,
1196 const void *termp, const void *winp) {
1197 ENSURE_MSAN_INITED();
1198 InterceptorScope interceptor_scope;
1199 int res = REAL(openpty)(aparent, aworker, name, termp, winp);
1200 if (!res) {
1201 __msan_unpoison(aparent, sizeof(*aparent));
1202 __msan_unpoison(aworker, sizeof(*aworker));
1203 }
1204 return res;
1205 }
1206 #define MSAN_MAYBE_INTERCEPT_OPENPTY INTERCEPT_FUNCTION(openpty)
1207 #else
1208 #define MSAN_MAYBE_INTERCEPT_OPENPTY
1209 #endif
1210
1211 // NetBSD ships with forkpty(3) in -lutil, that needs to be prebuilt explicitly
1212 // with MSan.
1213 #if SANITIZER_LINUX
INTERCEPTOR(int,forkpty,int * aparent,char * name,const void * termp,const void * winp)1214 INTERCEPTOR(int, forkpty, int *aparent, char *name, const void *termp,
1215 const void *winp) {
1216 ENSURE_MSAN_INITED();
1217 InterceptorScope interceptor_scope;
1218 int res = REAL(forkpty)(aparent, name, termp, winp);
1219 if (res != -1)
1220 __msan_unpoison(aparent, sizeof(*aparent));
1221 return res;
1222 }
1223 #define MSAN_MAYBE_INTERCEPT_FORKPTY INTERCEPT_FUNCTION(forkpty)
1224 #else
1225 #define MSAN_MAYBE_INTERCEPT_FORKPTY
1226 #endif
1227
1228 struct MSanInterceptorContext {
1229 bool in_interceptor_scope;
1230 };
1231
1232 namespace __msan {
1233
OnExit()1234 int OnExit() {
1235 // FIXME: ask frontend whether we need to return failure.
1236 return 0;
1237 }
1238
1239 } // namespace __msan
1240
1241 // A version of CHECK_UNPOISONED using a saved scope value. Used in common
1242 // interceptors.
1243 #define CHECK_UNPOISONED_CTX(ctx, x, n) \
1244 do { \
1245 if (!((MSanInterceptorContext *)ctx)->in_interceptor_scope) \
1246 CHECK_UNPOISONED_0(x, n); \
1247 } while (0)
1248
1249 #define MSAN_INTERCEPT_FUNC(name) \
1250 do { \
1251 if (!INTERCEPT_FUNCTION(name)) \
1252 VReport(1, "MemorySanitizer: failed to intercept '%s'\n", #name); \
1253 } while (0)
1254
1255 #define MSAN_INTERCEPT_FUNC_VER(name, ver) \
1256 do { \
1257 if (!INTERCEPT_FUNCTION_VER(name, ver)) \
1258 VReport(1, "MemorySanitizer: failed to intercept '%s@@%s'\n", #name, \
1259 #ver); \
1260 } while (0)
1261 #define MSAN_INTERCEPT_FUNC_VER_UNVERSIONED_FALLBACK(name, ver) \
1262 do { \
1263 if (!INTERCEPT_FUNCTION_VER(name, ver) && !INTERCEPT_FUNCTION(name)) \
1264 VReport(1, "MemorySanitizer: failed to intercept '%s@@%s' or '%s'\n", \
1265 #name, #ver, #name); \
1266 } while (0)
1267
1268 #define COMMON_INTERCEPT_FUNCTION(name) MSAN_INTERCEPT_FUNC(name)
1269 #define COMMON_INTERCEPT_FUNCTION_VER(name, ver) \
1270 MSAN_INTERCEPT_FUNC_VER(name, ver)
1271 #define COMMON_INTERCEPT_FUNCTION_VER_UNVERSIONED_FALLBACK(name, ver) \
1272 MSAN_INTERCEPT_FUNC_VER_UNVERSIONED_FALLBACK(name, ver)
1273 #define COMMON_INTERCEPTOR_UNPOISON_PARAM(count) \
1274 UnpoisonParam(count)
1275 #define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \
1276 __msan_unpoison(ptr, size)
1277 #define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \
1278 CHECK_UNPOISONED_CTX(ctx, ptr, size)
1279 #define COMMON_INTERCEPTOR_INITIALIZE_RANGE(ptr, size) \
1280 __msan_unpoison(ptr, size)
1281 #define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \
1282 if (msan_init_is_running) return REAL(func)(__VA_ARGS__); \
1283 ENSURE_MSAN_INITED(); \
1284 MSanInterceptorContext msan_ctx = {IsInInterceptorScope()}; \
1285 ctx = (void *)&msan_ctx; \
1286 (void)ctx; \
1287 InterceptorScope interceptor_scope; \
1288 __msan_unpoison(__errno_location(), sizeof(int)); /* NOLINT */
1289 #define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
1290 do { \
1291 } while (false)
1292 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
1293 do { \
1294 } while (false)
1295 #define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \
1296 do { \
1297 } while (false)
1298 #define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \
1299 do { \
1300 } while (false)
1301 #define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \
1302 do { \
1303 } while (false) // FIXME
1304 #define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \
1305 do { \
1306 } while (false) // FIXME
1307 #define COMMON_INTERCEPTOR_BLOCK_REAL(name) REAL(name)
1308 #define COMMON_INTERCEPTOR_ON_EXIT(ctx) OnExit()
1309 #define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) \
1310 do { \
1311 link_map *map = GET_LINK_MAP_BY_DLOPEN_HANDLE((handle)); \
1312 if (filename && map) \
1313 ForEachMappedRegion(map, __msan_unpoison); \
1314 } while (false)
1315
1316 #define COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED (!msan_inited)
1317
1318 #define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \
1319 if (MsanThread *t = GetCurrentThread()) { \
1320 *begin = t->tls_begin(); \
1321 *end = t->tls_end(); \
1322 } else { \
1323 *begin = *end = 0; \
1324 }
1325
1326 #define COMMON_INTERCEPTOR_MEMSET_IMPL(ctx, block, c, size) \
1327 { \
1328 (void)ctx; \
1329 return __msan_memset(block, c, size); \
1330 }
1331 #define COMMON_INTERCEPTOR_MEMMOVE_IMPL(ctx, to, from, size) \
1332 { \
1333 (void)ctx; \
1334 return __msan_memmove(to, from, size); \
1335 }
1336 #define COMMON_INTERCEPTOR_MEMCPY_IMPL(ctx, to, from, size) \
1337 { \
1338 (void)ctx; \
1339 return __msan_memcpy(to, from, size); \
1340 }
1341
1342 #define COMMON_INTERCEPTOR_COPY_STRING(ctx, to, from, size) \
1343 do { \
1344 GET_STORE_STACK_TRACE; \
1345 CopyShadowAndOrigin(to, from, size, &stack); \
1346 __msan_unpoison(to + size, 1); \
1347 } while (false)
1348
1349 #define COMMON_INTERCEPTOR_MMAP_IMPL(ctx, mmap, addr, length, prot, flags, fd, \
1350 offset) \
1351 do { \
1352 return mmap_interceptor(REAL(mmap), addr, sz, prot, flags, fd, off); \
1353 } while (false)
1354
1355 #include "sanitizer_common/sanitizer_platform_interceptors.h"
1356 #include "sanitizer_common/sanitizer_common_interceptors.inc"
1357
1358 static uptr signal_impl(int signo, uptr cb);
1359 static int sigaction_impl(int signo, const __sanitizer_sigaction *act,
1360 __sanitizer_sigaction *oldact);
1361
1362 #define SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signo, act, oldact) \
1363 { return sigaction_impl(signo, act, oldact); }
1364
1365 #define SIGNAL_INTERCEPTOR_SIGNAL_IMPL(func, signo, handler) \
1366 { \
1367 handler = signal_impl(signo, handler); \
1368 InterceptorScope interceptor_scope; \
1369 return REAL(func)(signo, handler); \
1370 }
1371
1372 #include "sanitizer_common/sanitizer_signal_interceptors.inc"
1373
sigaction_impl(int signo,const __sanitizer_sigaction * act,__sanitizer_sigaction * oldact)1374 static int sigaction_impl(int signo, const __sanitizer_sigaction *act,
1375 __sanitizer_sigaction *oldact) {
1376 ENSURE_MSAN_INITED();
1377 if (signo <= 0 || signo >= kMaxSignals) {
1378 errno = errno_EINVAL;
1379 return -1;
1380 }
1381 if (act) read_sigaction(act);
1382 int res;
1383 if (flags()->wrap_signals) {
1384 SpinMutexLock lock(&sigactions_mu);
1385 uptr old_cb = atomic_load(&sigactions[signo], memory_order_relaxed);
1386 __sanitizer_sigaction new_act;
1387 __sanitizer_sigaction *pnew_act = act ? &new_act : nullptr;
1388 if (act) {
1389 REAL(memcpy)(pnew_act, act, sizeof(__sanitizer_sigaction));
1390 uptr cb = (uptr)pnew_act->sigaction;
1391 uptr new_cb = (pnew_act->sa_flags & __sanitizer::sa_siginfo)
1392 ? (uptr)SignalAction
1393 : (uptr)SignalHandler;
1394 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
1395 atomic_store(&sigactions[signo], cb, memory_order_relaxed);
1396 pnew_act->sigaction = (decltype(pnew_act->sigaction))new_cb;
1397 }
1398 }
1399 res = REAL(SIGACTION_SYMNAME)(signo, pnew_act, oldact);
1400 if (res == 0 && oldact) {
1401 uptr cb = (uptr)oldact->sigaction;
1402 if (cb == (uptr)SignalAction || cb == (uptr)SignalHandler) {
1403 oldact->sigaction = (decltype(oldact->sigaction))old_cb;
1404 }
1405 }
1406 } else {
1407 res = REAL(SIGACTION_SYMNAME)(signo, act, oldact);
1408 }
1409
1410 if (res == 0 && oldact) {
1411 __msan_unpoison(oldact, sizeof(__sanitizer_sigaction));
1412 }
1413 return res;
1414 }
1415
signal_impl(int signo,uptr cb)1416 static uptr signal_impl(int signo, uptr cb) {
1417 ENSURE_MSAN_INITED();
1418 if (signo <= 0 || signo >= kMaxSignals) {
1419 errno = errno_EINVAL;
1420 return -1;
1421 }
1422 if (flags()->wrap_signals) {
1423 SpinMutexLock lock(&sigactions_mu);
1424 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
1425 atomic_store(&sigactions[signo], cb, memory_order_relaxed);
1426 cb = (uptr)&SignalHandler;
1427 }
1428 }
1429 return cb;
1430 }
1431
1432 #define COMMON_SYSCALL_PRE_READ_RANGE(p, s) CHECK_UNPOISONED(p, s)
1433 #define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
1434 do { \
1435 } while (false)
1436 #define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
1437 do { \
1438 } while (false)
1439 #define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) __msan_unpoison(p, s)
1440 #include "sanitizer_common/sanitizer_common_syscalls.inc"
1441 #include "sanitizer_common/sanitizer_syscalls_netbsd.inc"
1442
1443 struct dlinfo {
1444 char *dli_fname;
1445 void *dli_fbase;
1446 char *dli_sname;
1447 void *dli_saddr;
1448 };
1449
INTERCEPTOR(int,dladdr,void * addr,dlinfo * info)1450 INTERCEPTOR(int, dladdr, void *addr, dlinfo *info) {
1451 void *ctx;
1452 COMMON_INTERCEPTOR_ENTER(ctx, dladdr, addr, info);
1453 int res = REAL(dladdr)(addr, info);
1454 if (res != 0) {
1455 __msan_unpoison(info, sizeof(*info));
1456 if (info->dli_fname)
1457 __msan_unpoison(info->dli_fname, REAL(strlen)(info->dli_fname) + 1);
1458 if (info->dli_sname)
1459 __msan_unpoison(info->dli_sname, REAL(strlen)(info->dli_sname) + 1);
1460 }
1461 return res;
1462 }
1463
INTERCEPTOR(char *,dlerror,int fake)1464 INTERCEPTOR(char *, dlerror, int fake) {
1465 void *ctx;
1466 COMMON_INTERCEPTOR_ENTER(ctx, dlerror, fake);
1467 char *res = REAL(dlerror)(fake);
1468 if (res) __msan_unpoison(res, REAL(strlen)(res) + 1);
1469 return res;
1470 }
1471
1472 typedef int (*dl_iterate_phdr_cb)(__sanitizer_dl_phdr_info *info, SIZE_T size,
1473 void *data);
1474 struct dl_iterate_phdr_data {
1475 dl_iterate_phdr_cb callback;
1476 void *data;
1477 };
1478
msan_dl_iterate_phdr_cb(__sanitizer_dl_phdr_info * info,SIZE_T size,void * data)1479 static int msan_dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size,
1480 void *data) {
1481 if (info) {
1482 __msan_unpoison(info, size);
1483 if (info->dlpi_phdr && info->dlpi_phnum)
1484 __msan_unpoison(info->dlpi_phdr, struct_ElfW_Phdr_sz * info->dlpi_phnum);
1485 if (info->dlpi_name)
1486 __msan_unpoison(info->dlpi_name, REAL(strlen)(info->dlpi_name) + 1);
1487 }
1488 dl_iterate_phdr_data *cbdata = (dl_iterate_phdr_data *)data;
1489 UnpoisonParam(3);
1490 return cbdata->callback(info, size, cbdata->data);
1491 }
1492
INTERCEPTOR(void *,shmat,int shmid,const void * shmaddr,int shmflg)1493 INTERCEPTOR(void *, shmat, int shmid, const void *shmaddr, int shmflg) {
1494 ENSURE_MSAN_INITED();
1495 void *p = REAL(shmat)(shmid, shmaddr, shmflg);
1496 if (p != (void *)-1) {
1497 __sanitizer_shmid_ds ds;
1498 int res = REAL(shmctl)(shmid, shmctl_ipc_stat, &ds);
1499 if (!res) {
1500 __msan_unpoison(p, ds.shm_segsz);
1501 }
1502 }
1503 return p;
1504 }
1505
INTERCEPTOR(int,dl_iterate_phdr,dl_iterate_phdr_cb callback,void * data)1506 INTERCEPTOR(int, dl_iterate_phdr, dl_iterate_phdr_cb callback, void *data) {
1507 void *ctx;
1508 COMMON_INTERCEPTOR_ENTER(ctx, dl_iterate_phdr, callback, data);
1509 dl_iterate_phdr_data cbdata;
1510 cbdata.callback = callback;
1511 cbdata.data = data;
1512 int res = REAL(dl_iterate_phdr)(msan_dl_iterate_phdr_cb, (void *)&cbdata);
1513 return res;
1514 }
1515
1516 // wchar_t *wcschr(const wchar_t *wcs, wchar_t wc);
INTERCEPTOR(wchar_t *,wcschr,void * s,wchar_t wc,void * ps)1517 INTERCEPTOR(wchar_t *, wcschr, void *s, wchar_t wc, void *ps) {
1518 ENSURE_MSAN_INITED();
1519 wchar_t *res = REAL(wcschr)(s, wc, ps);
1520 return res;
1521 }
1522
1523 // wchar_t *wcscpy(wchar_t *dest, const wchar_t *src);
INTERCEPTOR(wchar_t *,wcscpy,wchar_t * dest,const wchar_t * src)1524 INTERCEPTOR(wchar_t *, wcscpy, wchar_t *dest, const wchar_t *src) {
1525 ENSURE_MSAN_INITED();
1526 GET_STORE_STACK_TRACE;
1527 wchar_t *res = REAL(wcscpy)(dest, src);
1528 CopyShadowAndOrigin(dest, src, sizeof(wchar_t) * (REAL(wcslen)(src) + 1),
1529 &stack);
1530 return res;
1531 }
1532
INTERCEPTOR(wchar_t *,wcsncpy,wchar_t * dest,const wchar_t * src,SIZE_T n)1533 INTERCEPTOR(wchar_t *, wcsncpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
1534 ENSURE_MSAN_INITED();
1535 GET_STORE_STACK_TRACE;
1536 SIZE_T copy_size = REAL(wcsnlen)(src, n);
1537 if (copy_size < n) copy_size++; // trailing \0
1538 wchar_t *res = REAL(wcsncpy)(dest, src, n);
1539 CopyShadowAndOrigin(dest, src, copy_size * sizeof(wchar_t), &stack);
1540 __msan_unpoison(dest + copy_size, (n - copy_size) * sizeof(wchar_t));
1541 return res;
1542 }
1543
1544 // These interface functions reside here so that they can use
1545 // REAL(memset), etc.
__msan_unpoison(const void * a,uptr size)1546 void __msan_unpoison(const void *a, uptr size) {
1547 if (!MEM_IS_APP(a)) return;
1548 SetShadow(a, size, 0);
1549 }
1550
__msan_poison(const void * a,uptr size)1551 void __msan_poison(const void *a, uptr size) {
1552 if (!MEM_IS_APP(a)) return;
1553 SetShadow(a, size, __msan::flags()->poison_heap_with_zeroes ? 0 : -1);
1554 }
1555
__msan_poison_stack(void * a,uptr size)1556 void __msan_poison_stack(void *a, uptr size) {
1557 if (!MEM_IS_APP(a)) return;
1558 SetShadow(a, size, __msan::flags()->poison_stack_with_zeroes ? 0 : -1);
1559 }
1560
__msan_unpoison_param(uptr n)1561 void __msan_unpoison_param(uptr n) { UnpoisonParam(n); }
1562
__msan_clear_and_unpoison(void * a,uptr size)1563 void __msan_clear_and_unpoison(void *a, uptr size) {
1564 REAL(memset)(a, 0, size);
1565 SetShadow(a, size, 0);
1566 }
1567
__msan_memcpy(void * dest,const void * src,SIZE_T n)1568 void *__msan_memcpy(void *dest, const void *src, SIZE_T n) {
1569 if (!msan_inited) return internal_memcpy(dest, src, n);
1570 if (msan_init_is_running || __msan::IsInSymbolizer())
1571 return REAL(memcpy)(dest, src, n);
1572 ENSURE_MSAN_INITED();
1573 GET_STORE_STACK_TRACE;
1574 void *res = REAL(memcpy)(dest, src, n);
1575 CopyShadowAndOrigin(dest, src, n, &stack);
1576 return res;
1577 }
1578
__msan_memset(void * s,int c,SIZE_T n)1579 void *__msan_memset(void *s, int c, SIZE_T n) {
1580 if (!msan_inited) return internal_memset(s, c, n);
1581 if (msan_init_is_running) return REAL(memset)(s, c, n);
1582 ENSURE_MSAN_INITED();
1583 void *res = REAL(memset)(s, c, n);
1584 __msan_unpoison(s, n);
1585 return res;
1586 }
1587
__msan_memmove(void * dest,const void * src,SIZE_T n)1588 void *__msan_memmove(void *dest, const void *src, SIZE_T n) {
1589 if (!msan_inited) return internal_memmove(dest, src, n);
1590 if (msan_init_is_running) return REAL(memmove)(dest, src, n);
1591 ENSURE_MSAN_INITED();
1592 GET_STORE_STACK_TRACE;
1593 void *res = REAL(memmove)(dest, src, n);
1594 MoveShadowAndOrigin(dest, src, n, &stack);
1595 return res;
1596 }
1597
__msan_unpoison_string(const char * s)1598 void __msan_unpoison_string(const char* s) {
1599 if (!MEM_IS_APP(s)) return;
1600 __msan_unpoison(s, REAL(strlen)(s) + 1);
1601 }
1602
1603 namespace __msan {
1604
InitializeInterceptors()1605 void InitializeInterceptors() {
1606 static int inited = 0;
1607 CHECK_EQ(inited, 0);
1608
1609 new(interceptor_ctx()) InterceptorContext();
1610
1611 InitializeCommonInterceptors();
1612 InitializeSignalInterceptors();
1613
1614 INTERCEPT_FUNCTION(posix_memalign);
1615 MSAN_MAYBE_INTERCEPT_MEMALIGN;
1616 MSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN;
1617 INTERCEPT_FUNCTION(valloc);
1618 MSAN_MAYBE_INTERCEPT_PVALLOC;
1619 INTERCEPT_FUNCTION(malloc);
1620 INTERCEPT_FUNCTION(calloc);
1621 INTERCEPT_FUNCTION(realloc);
1622 INTERCEPT_FUNCTION(reallocarray);
1623 INTERCEPT_FUNCTION(free);
1624 MSAN_MAYBE_INTERCEPT_CFREE;
1625 MSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE;
1626 MSAN_MAYBE_INTERCEPT_MALLINFO;
1627 MSAN_MAYBE_INTERCEPT_MALLOPT;
1628 MSAN_MAYBE_INTERCEPT_MALLOC_STATS;
1629 INTERCEPT_FUNCTION(fread);
1630 MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED;
1631 INTERCEPT_FUNCTION(memccpy);
1632 MSAN_MAYBE_INTERCEPT_MEMPCPY;
1633 INTERCEPT_FUNCTION(bcopy);
1634 INTERCEPT_FUNCTION(wmemset);
1635 INTERCEPT_FUNCTION(wmemcpy);
1636 MSAN_MAYBE_INTERCEPT_WMEMPCPY;
1637 INTERCEPT_FUNCTION(wmemmove);
1638 INTERCEPT_FUNCTION(strcpy);
1639 MSAN_MAYBE_INTERCEPT_STPCPY;
1640 INTERCEPT_FUNCTION(strdup);
1641 MSAN_MAYBE_INTERCEPT___STRDUP;
1642 INTERCEPT_FUNCTION(strncpy);
1643 MSAN_MAYBE_INTERCEPT_GCVT;
1644 INTERCEPT_FUNCTION(strcat);
1645 INTERCEPT_FUNCTION(strncat);
1646 INTERCEPT_STRTO(strtod);
1647 INTERCEPT_STRTO(strtof);
1648 INTERCEPT_STRTO(strtold);
1649 INTERCEPT_STRTO(strtol);
1650 INTERCEPT_STRTO(strtoul);
1651 INTERCEPT_STRTO(strtoll);
1652 INTERCEPT_STRTO(strtoull);
1653 INTERCEPT_STRTO(strtouq);
1654 INTERCEPT_STRTO(wcstod);
1655 INTERCEPT_STRTO(wcstof);
1656 INTERCEPT_STRTO(wcstold);
1657 INTERCEPT_STRTO(wcstol);
1658 INTERCEPT_STRTO(wcstoul);
1659 INTERCEPT_STRTO(wcstoll);
1660 INTERCEPT_STRTO(wcstoull);
1661 #ifdef SANITIZER_NLDBL_VERSION
1662 INTERCEPT_FUNCTION_VER(vswprintf, SANITIZER_NLDBL_VERSION);
1663 INTERCEPT_FUNCTION_VER(swprintf, SANITIZER_NLDBL_VERSION);
1664 #else
1665 INTERCEPT_FUNCTION(vswprintf);
1666 INTERCEPT_FUNCTION(swprintf);
1667 #endif
1668 INTERCEPT_FUNCTION(strftime);
1669 INTERCEPT_FUNCTION(strftime_l);
1670 MSAN_MAYBE_INTERCEPT___STRFTIME_L;
1671 INTERCEPT_FUNCTION(wcsftime);
1672 INTERCEPT_FUNCTION(wcsftime_l);
1673 MSAN_MAYBE_INTERCEPT___WCSFTIME_L;
1674 INTERCEPT_FUNCTION(mbtowc);
1675 INTERCEPT_FUNCTION(mbrtowc);
1676 INTERCEPT_FUNCTION(wcslen);
1677 INTERCEPT_FUNCTION(wcsnlen);
1678 INTERCEPT_FUNCTION(wcschr);
1679 INTERCEPT_FUNCTION(wcscpy);
1680 INTERCEPT_FUNCTION(wcsncpy);
1681 INTERCEPT_FUNCTION(wcscmp);
1682 INTERCEPT_FUNCTION(getenv);
1683 INTERCEPT_FUNCTION(setenv);
1684 INTERCEPT_FUNCTION(putenv);
1685 INTERCEPT_FUNCTION(gettimeofday);
1686 MSAN_MAYBE_INTERCEPT_FCVT;
1687 MSAN_MAYBE_INTERCEPT_FSTAT;
1688 MSAN_MAYBE_INTERCEPT___FXSTAT;
1689 MSAN_INTERCEPT_FSTATAT;
1690 MSAN_MAYBE_INTERCEPT___FXSTAT64;
1691 MSAN_MAYBE_INTERCEPT___FXSTATAT64;
1692 INTERCEPT_FUNCTION(pipe);
1693 INTERCEPT_FUNCTION(pipe2);
1694 INTERCEPT_FUNCTION(socketpair);
1695 MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED;
1696 INTERCEPT_FUNCTION(getrlimit);
1697 MSAN_MAYBE_INTERCEPT___GETRLIMIT;
1698 MSAN_MAYBE_INTERCEPT_GETRLIMIT64;
1699 MSAN_MAYBE_INTERCEPT_PRLIMIT;
1700 MSAN_MAYBE_INTERCEPT_PRLIMIT64;
1701 INTERCEPT_FUNCTION(gethostname);
1702 MSAN_MAYBE_INTERCEPT_EPOLL_WAIT;
1703 MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT;
1704 INTERCEPT_FUNCTION(dladdr);
1705 INTERCEPT_FUNCTION(dlerror);
1706 INTERCEPT_FUNCTION(dl_iterate_phdr);
1707 INTERCEPT_FUNCTION(getrusage);
1708 #if defined(__mips__)
1709 INTERCEPT_FUNCTION_VER(pthread_create, "GLIBC_2.2");
1710 #else
1711 INTERCEPT_FUNCTION(pthread_create);
1712 #endif
1713 INTERCEPT_FUNCTION(pthread_key_create);
1714
1715 #if SANITIZER_NETBSD
1716 INTERCEPT_FUNCTION(__libc_thr_keycreate);
1717 #endif
1718
1719 INTERCEPT_FUNCTION(pthread_join);
1720 INTERCEPT_FUNCTION(tzset);
1721 INTERCEPT_FUNCTION(atexit);
1722 INTERCEPT_FUNCTION(__cxa_atexit);
1723 INTERCEPT_FUNCTION(shmat);
1724 INTERCEPT_FUNCTION(fork);
1725 MSAN_MAYBE_INTERCEPT_OPENPTY;
1726 MSAN_MAYBE_INTERCEPT_FORKPTY;
1727
1728 inited = 1;
1729 }
1730 } // namespace __msan
1731