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_poisoning.h" 22 #include "msan_report.h" 23 #include "msan_thread.h" 24 #include "sanitizer_common/sanitizer_allocator.h" 25 #include "sanitizer_common/sanitizer_allocator_dlsym.h" 26 #include "sanitizer_common/sanitizer_allocator_interface.h" 27 #include "sanitizer_common/sanitizer_atomic.h" 28 #include "sanitizer_common/sanitizer_common.h" 29 #include "sanitizer_common/sanitizer_errno.h" 30 #include "sanitizer_common/sanitizer_errno_codes.h" 31 #include "sanitizer_common/sanitizer_glibc_version.h" 32 #include "sanitizer_common/sanitizer_libc.h" 33 #include "sanitizer_common/sanitizer_linux.h" 34 #include "sanitizer_common/sanitizer_platform_limits_netbsd.h" 35 #include "sanitizer_common/sanitizer_platform_limits_posix.h" 36 #include "sanitizer_common/sanitizer_stackdepot.h" 37 #include "sanitizer_common/sanitizer_tls_get_addr.h" 38 #include "sanitizer_common/sanitizer_vector.h" 39 40 #if SANITIZER_NETBSD 41 #define fstat __fstat50 42 #define gettimeofday __gettimeofday50 43 #define getrusage __getrusage50 44 #define tzset __tzset50 45 #endif 46 47 #include <stdarg.h> 48 // ACHTUNG! No other system header includes in this file. 49 // Ideally, we should get rid of stdarg.h as well. 50 51 using namespace __msan; 52 53 using __sanitizer::memory_order; 54 using __sanitizer::atomic_load; 55 using __sanitizer::atomic_store; 56 using __sanitizer::atomic_uintptr_t; 57 58 DECLARE_REAL(SIZE_T, strlen, const char *s) 59 DECLARE_REAL(SIZE_T, strnlen, const char *s, SIZE_T maxlen) 60 DECLARE_REAL(void *, memcpy, void *dest, const void *src, uptr n) 61 DECLARE_REAL(void *, memset, void *dest, int c, uptr n) 62 63 // True if this is a nested interceptor. 64 static THREADLOCAL int in_interceptor_scope; 65 66 void __msan_scoped_disable_interceptor_checks() { ++in_interceptor_scope; } 67 void __msan_scoped_enable_interceptor_checks() { --in_interceptor_scope; } 68 69 struct InterceptorScope { 70 InterceptorScope() { ++in_interceptor_scope; } 71 ~InterceptorScope() { --in_interceptor_scope; } 72 }; 73 74 bool IsInInterceptorScope() { 75 return in_interceptor_scope; 76 } 77 78 struct DlsymAlloc : public DlSymAllocator<DlsymAlloc> { 79 static bool UseImpl() { return !msan_inited; } 80 }; 81 82 #define ENSURE_MSAN_INITED() do { \ 83 CHECK(!msan_init_is_running); \ 84 if (!msan_inited) { \ 85 __msan_init(); \ 86 } \ 87 } while (0) 88 89 // Check that [x, x+n) range is unpoisoned. 90 #define CHECK_UNPOISONED_0(x, n) \ 91 do { \ 92 sptr __offset = __msan_test_shadow(x, n); \ 93 if (__msan::IsInSymbolizerOrUnwider()) \ 94 break; \ 95 if (__offset >= 0 && __msan::flags()->report_umrs) { \ 96 GET_CALLER_PC_BP_SP; \ 97 (void)sp; \ 98 ReportUMRInsideAddressRange(__func__, x, n, __offset); \ 99 __msan::PrintWarningWithOrigin( \ 100 pc, bp, __msan_get_origin((const char *)x + __offset)); \ 101 if (__msan::flags()->halt_on_error) { \ 102 Printf("Exiting\n"); \ 103 Die(); \ 104 } \ 105 } \ 106 } while (0) 107 108 // Check that [x, x+n) range is unpoisoned unless we are in a nested 109 // interceptor. 110 #define CHECK_UNPOISONED(x, n) \ 111 do { \ 112 if (!IsInInterceptorScope()) CHECK_UNPOISONED_0(x, n); \ 113 } while (0) 114 115 #define CHECK_UNPOISONED_STRING_OF_LEN(x, len, n) \ 116 CHECK_UNPOISONED((x), \ 117 common_flags()->strict_string_checks ? (len) + 1 : (n) ) 118 119 #define CHECK_UNPOISONED_STRING(x, n) \ 120 CHECK_UNPOISONED_STRING_OF_LEN((x), internal_strlen(x), (n)) 121 122 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 123 INTERCEPTOR(SIZE_T, fread_unlocked, void *ptr, SIZE_T size, SIZE_T nmemb, 124 void *file) { 125 ENSURE_MSAN_INITED(); 126 SIZE_T res = REAL(fread_unlocked)(ptr, size, nmemb, file); 127 if (res > 0) 128 __msan_unpoison(ptr, res *size); 129 return res; 130 } 131 #define MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED INTERCEPT_FUNCTION(fread_unlocked) 132 #else 133 #define MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED 134 #endif 135 136 #if !SANITIZER_NETBSD 137 INTERCEPTOR(void *, mempcpy, void *dest, const void *src, SIZE_T n) { 138 return (char *)__msan_memcpy(dest, src, n) + n; 139 } 140 #define MSAN_MAYBE_INTERCEPT_MEMPCPY INTERCEPT_FUNCTION(mempcpy) 141 #else 142 #define MSAN_MAYBE_INTERCEPT_MEMPCPY 143 #endif 144 145 INTERCEPTOR(void *, memccpy, void *dest, const void *src, int c, SIZE_T n) { 146 ENSURE_MSAN_INITED(); 147 void *res = REAL(memccpy)(dest, src, c, n); 148 CHECK(!res || (res >= dest && res <= (char *)dest + n)); 149 SIZE_T sz = res ? (char *)res - (char *)dest : n; 150 CHECK_UNPOISONED(src, sz); 151 __msan_unpoison(dest, sz); 152 return res; 153 } 154 155 INTERCEPTOR(void *, bcopy, const void *src, void *dest, SIZE_T n) { 156 return __msan_memmove(dest, src, n); 157 } 158 159 INTERCEPTOR(int, posix_memalign, void **memptr, SIZE_T alignment, SIZE_T size) { 160 GET_MALLOC_STACK_TRACE; 161 CHECK_NE(memptr, 0); 162 int res = msan_posix_memalign(memptr, alignment, size, &stack); 163 if (!res) 164 __msan_unpoison(memptr, sizeof(*memptr)); 165 return res; 166 } 167 168 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 169 INTERCEPTOR(void *, memalign, SIZE_T alignment, SIZE_T size) { 170 GET_MALLOC_STACK_TRACE; 171 return msan_memalign(alignment, size, &stack); 172 } 173 #define MSAN_MAYBE_INTERCEPT_MEMALIGN INTERCEPT_FUNCTION(memalign) 174 #else 175 #define MSAN_MAYBE_INTERCEPT_MEMALIGN 176 #endif 177 178 INTERCEPTOR(void *, aligned_alloc, SIZE_T alignment, SIZE_T size) { 179 GET_MALLOC_STACK_TRACE; 180 return msan_aligned_alloc(alignment, size, &stack); 181 } 182 183 #if !SANITIZER_NETBSD 184 INTERCEPTOR(void *, __libc_memalign, SIZE_T alignment, SIZE_T size) { 185 GET_MALLOC_STACK_TRACE; 186 void *ptr = msan_memalign(alignment, size, &stack); 187 if (ptr) 188 DTLS_on_libc_memalign(ptr, size); 189 return ptr; 190 } 191 #define MSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN INTERCEPT_FUNCTION(__libc_memalign) 192 #else 193 #define MSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN 194 #endif 195 196 INTERCEPTOR(void *, valloc, SIZE_T size) { 197 GET_MALLOC_STACK_TRACE; 198 return msan_valloc(size, &stack); 199 } 200 201 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 202 INTERCEPTOR(void *, pvalloc, SIZE_T size) { 203 GET_MALLOC_STACK_TRACE; 204 return msan_pvalloc(size, &stack); 205 } 206 #define MSAN_MAYBE_INTERCEPT_PVALLOC INTERCEPT_FUNCTION(pvalloc) 207 #else 208 #define MSAN_MAYBE_INTERCEPT_PVALLOC 209 #endif 210 211 INTERCEPTOR(void, free, void *ptr) { 212 if (UNLIKELY(!ptr)) 213 return; 214 if (DlsymAlloc::PointerIsMine(ptr)) 215 return DlsymAlloc::Free(ptr); 216 GET_MALLOC_STACK_TRACE; 217 MsanDeallocate(&stack, ptr); 218 } 219 220 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 221 INTERCEPTOR(void, cfree, void *ptr) { 222 if (UNLIKELY(!ptr)) 223 return; 224 if (DlsymAlloc::PointerIsMine(ptr)) 225 return DlsymAlloc::Free(ptr); 226 GET_MALLOC_STACK_TRACE; 227 MsanDeallocate(&stack, ptr); 228 } 229 # define MSAN_MAYBE_INTERCEPT_CFREE INTERCEPT_FUNCTION(cfree) 230 #else 231 #define MSAN_MAYBE_INTERCEPT_CFREE 232 #endif 233 234 #if !SANITIZER_NETBSD 235 INTERCEPTOR(uptr, malloc_usable_size, void *ptr) { 236 return __sanitizer_get_allocated_size(ptr); 237 } 238 #define MSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE \ 239 INTERCEPT_FUNCTION(malloc_usable_size) 240 #else 241 #define MSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE 242 #endif 243 244 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 245 // This function actually returns a struct by value, but we can't unpoison a 246 // temporary! The following is equivalent on all supported platforms but 247 // aarch64 (which uses a different register for sret value). We have a test 248 // to confirm that. 249 INTERCEPTOR(void, mallinfo, __sanitizer_struct_mallinfo *sret) { 250 #ifdef __aarch64__ 251 uptr r8; 252 asm volatile("mov %0,x8" : "=r" (r8)); 253 sret = reinterpret_cast<__sanitizer_struct_mallinfo*>(r8); 254 #endif 255 REAL(memset)(sret, 0, sizeof(*sret)); 256 __msan_unpoison(sret, sizeof(*sret)); 257 } 258 #define MSAN_MAYBE_INTERCEPT_MALLINFO INTERCEPT_FUNCTION(mallinfo) 259 #else 260 #define MSAN_MAYBE_INTERCEPT_MALLINFO 261 #endif 262 263 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 264 INTERCEPTOR(int, mallopt, int cmd, int value) { 265 return 0; 266 } 267 #define MSAN_MAYBE_INTERCEPT_MALLOPT INTERCEPT_FUNCTION(mallopt) 268 #else 269 #define MSAN_MAYBE_INTERCEPT_MALLOPT 270 #endif 271 272 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 273 INTERCEPTOR(void, malloc_stats, void) { 274 // FIXME: implement, but don't call REAL(malloc_stats)! 275 } 276 #define MSAN_MAYBE_INTERCEPT_MALLOC_STATS INTERCEPT_FUNCTION(malloc_stats) 277 #else 278 #define MSAN_MAYBE_INTERCEPT_MALLOC_STATS 279 #endif 280 281 INTERCEPTOR(char *, strcpy, char *dest, const char *src) { 282 ENSURE_MSAN_INITED(); 283 GET_STORE_STACK_TRACE; 284 SIZE_T n = internal_strlen(src); 285 CHECK_UNPOISONED_STRING(src + n, 0); 286 char *res = REAL(strcpy)(dest, src); 287 CopyShadowAndOrigin(dest, src, n + 1, &stack); 288 return res; 289 } 290 291 INTERCEPTOR(char *, strncpy, char *dest, const char *src, SIZE_T n) { 292 ENSURE_MSAN_INITED(); 293 GET_STORE_STACK_TRACE; 294 SIZE_T copy_size = internal_strnlen(src, n); 295 if (copy_size < n) 296 copy_size++; // trailing \0 297 char *res = REAL(strncpy)(dest, src, n); 298 CopyShadowAndOrigin(dest, src, copy_size, &stack); 299 __msan_unpoison(dest + copy_size, n - copy_size); 300 return res; 301 } 302 303 #if !SANITIZER_NETBSD 304 INTERCEPTOR(char *, stpcpy, char *dest, const char *src) { 305 ENSURE_MSAN_INITED(); 306 GET_STORE_STACK_TRACE; 307 SIZE_T n = internal_strlen(src); 308 CHECK_UNPOISONED_STRING(src + n, 0); 309 char *res = REAL(stpcpy)(dest, src); 310 CopyShadowAndOrigin(dest, src, n + 1, &stack); 311 return res; 312 } 313 #define MSAN_MAYBE_INTERCEPT_STPCPY INTERCEPT_FUNCTION(stpcpy) 314 #else 315 #define MSAN_MAYBE_INTERCEPT_STPCPY 316 #endif 317 318 INTERCEPTOR(char *, strdup, char *src) { 319 ENSURE_MSAN_INITED(); 320 GET_STORE_STACK_TRACE; 321 // On FreeBSD strdup() leverages strlen(). 322 InterceptorScope interceptor_scope; 323 SIZE_T n = internal_strlen(src); 324 CHECK_UNPOISONED_STRING(src + n, 0); 325 char *res = REAL(strdup)(src); 326 CopyShadowAndOrigin(res, src, n + 1, &stack); 327 return res; 328 } 329 330 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 331 INTERCEPTOR(char *, __strdup, char *src) { 332 ENSURE_MSAN_INITED(); 333 GET_STORE_STACK_TRACE; 334 SIZE_T n = internal_strlen(src); 335 CHECK_UNPOISONED_STRING(src + n, 0); 336 char *res = REAL(__strdup)(src); 337 CopyShadowAndOrigin(res, src, n + 1, &stack); 338 return res; 339 } 340 #define MSAN_MAYBE_INTERCEPT___STRDUP INTERCEPT_FUNCTION(__strdup) 341 #else 342 #define MSAN_MAYBE_INTERCEPT___STRDUP 343 #endif 344 345 #if !SANITIZER_NETBSD 346 INTERCEPTOR(char *, gcvt, double number, SIZE_T ndigit, char *buf) { 347 ENSURE_MSAN_INITED(); 348 char *res = REAL(gcvt)(number, ndigit, buf); 349 SIZE_T n = internal_strlen(buf); 350 __msan_unpoison(buf, n + 1); 351 return res; 352 } 353 #define MSAN_MAYBE_INTERCEPT_GCVT INTERCEPT_FUNCTION(gcvt) 354 #else 355 #define MSAN_MAYBE_INTERCEPT_GCVT 356 #endif 357 358 INTERCEPTOR(char *, strcat, char *dest, const char *src) { 359 ENSURE_MSAN_INITED(); 360 GET_STORE_STACK_TRACE; 361 SIZE_T src_size = internal_strlen(src); 362 SIZE_T dest_size = internal_strlen(dest); 363 CHECK_UNPOISONED_STRING(src + src_size, 0); 364 CHECK_UNPOISONED_STRING(dest + dest_size, 0); 365 char *res = REAL(strcat)(dest, src); 366 CopyShadowAndOrigin(dest + dest_size, src, src_size + 1, &stack); 367 return res; 368 } 369 370 INTERCEPTOR(char *, strncat, char *dest, const char *src, SIZE_T n) { 371 ENSURE_MSAN_INITED(); 372 GET_STORE_STACK_TRACE; 373 SIZE_T dest_size = internal_strlen(dest); 374 SIZE_T copy_size = internal_strnlen(src, n); 375 CHECK_UNPOISONED_STRING(dest + dest_size, 0); 376 char *res = REAL(strncat)(dest, src, n); 377 CopyShadowAndOrigin(dest + dest_size, src, copy_size, &stack); 378 __msan_unpoison(dest + dest_size + copy_size, 1); // \0 379 return res; 380 } 381 382 // Hack: always pass nptr and endptr as part of __VA_ARGS_ to avoid having to 383 // deal with empty __VA_ARGS__ in the case of INTERCEPTOR_STRTO. 384 #define INTERCEPTOR_STRTO_BODY(ret_type, func, ...) \ 385 ENSURE_MSAN_INITED(); \ 386 ret_type res = REAL(func)(__VA_ARGS__); \ 387 __msan_unpoison(endptr, sizeof(*endptr)); \ 388 return res; 389 390 #define INTERCEPTOR_STRTO(ret_type, func, char_type) \ 391 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr) { \ 392 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr); \ 393 } 394 395 #define INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \ 396 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \ 397 int base) { \ 398 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base); \ 399 } 400 401 #define INTERCEPTOR_STRTO_LOC(ret_type, func, char_type) \ 402 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \ 403 void *loc) { \ 404 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, loc); \ 405 } 406 407 #define INTERCEPTOR_STRTO_BASE_LOC(ret_type, func, char_type) \ 408 INTERCEPTOR(ret_type, func, const char_type *nptr, char_type **endptr, \ 409 int base, void *loc) { \ 410 INTERCEPTOR_STRTO_BODY(ret_type, func, nptr, endptr, base, loc); \ 411 } 412 413 #if SANITIZER_NETBSD 414 #define INTERCEPTORS_STRTO(ret_type, func, char_type) \ 415 INTERCEPTOR_STRTO(ret_type, func, char_type) \ 416 INTERCEPTOR_STRTO_LOC(ret_type, func##_l, char_type) 417 418 #define INTERCEPTORS_STRTO_BASE(ret_type, func, char_type) \ 419 INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \ 420 INTERCEPTOR_STRTO_BASE_LOC(ret_type, func##_l, char_type) 421 422 #else 423 #define INTERCEPTORS_STRTO(ret_type, func, char_type) \ 424 INTERCEPTOR_STRTO(ret_type, func, char_type) \ 425 INTERCEPTOR_STRTO_LOC(ret_type, func##_l, char_type) \ 426 INTERCEPTOR_STRTO_LOC(ret_type, __##func##_l, char_type) \ 427 INTERCEPTOR_STRTO_LOC(ret_type, __##func##_internal, char_type) 428 429 #define INTERCEPTORS_STRTO_BASE(ret_type, func, char_type) \ 430 INTERCEPTOR_STRTO_BASE(ret_type, func, char_type) \ 431 INTERCEPTOR_STRTO_BASE_LOC(ret_type, func##_l, char_type) \ 432 INTERCEPTOR_STRTO_BASE_LOC(ret_type, __##func##_l, char_type) \ 433 INTERCEPTOR_STRTO_BASE_LOC(ret_type, __##func##_internal, char_type) 434 #endif 435 436 INTERCEPTORS_STRTO(double, strtod, char) 437 INTERCEPTORS_STRTO(float, strtof, char) 438 INTERCEPTORS_STRTO(long double, strtold, char) 439 INTERCEPTORS_STRTO_BASE(long, strtol, char) 440 INTERCEPTORS_STRTO_BASE(long long, strtoll, char) 441 INTERCEPTORS_STRTO_BASE(unsigned long, strtoul, char) 442 INTERCEPTORS_STRTO_BASE(unsigned long long, strtoull, char) 443 INTERCEPTORS_STRTO_BASE(u64, strtouq, char) 444 445 INTERCEPTORS_STRTO(double, wcstod, wchar_t) 446 INTERCEPTORS_STRTO(float, wcstof, wchar_t) 447 INTERCEPTORS_STRTO(long double, wcstold, wchar_t) 448 INTERCEPTORS_STRTO_BASE(long, wcstol, wchar_t) 449 INTERCEPTORS_STRTO_BASE(long long, wcstoll, wchar_t) 450 INTERCEPTORS_STRTO_BASE(unsigned long, wcstoul, wchar_t) 451 INTERCEPTORS_STRTO_BASE(unsigned long long, wcstoull, wchar_t) 452 453 #if SANITIZER_NETBSD 454 #define INTERCEPT_STRTO(func) \ 455 INTERCEPT_FUNCTION(func); \ 456 INTERCEPT_FUNCTION(func##_l); 457 #else 458 #define INTERCEPT_STRTO(func) \ 459 INTERCEPT_FUNCTION(func); \ 460 INTERCEPT_FUNCTION(func##_l); \ 461 INTERCEPT_FUNCTION(__##func##_l); \ 462 INTERCEPT_FUNCTION(__##func##_internal); 463 #endif 464 465 466 // FIXME: support *wprintf in common format interceptors. 467 INTERCEPTOR(int, vswprintf, void *str, uptr size, void *format, va_list ap) { 468 ENSURE_MSAN_INITED(); 469 int res = REAL(vswprintf)(str, size, format, ap); 470 if (res >= 0) { 471 __msan_unpoison(str, 4 * (res + 1)); 472 } 473 return res; 474 } 475 476 INTERCEPTOR(int, swprintf, void *str, uptr size, void *format, ...) { 477 ENSURE_MSAN_INITED(); 478 va_list ap; 479 va_start(ap, format); 480 int res = vswprintf(str, size, format, ap); 481 va_end(ap); 482 return res; 483 } 484 485 #define INTERCEPTOR_STRFTIME_BODY(char_type, ret_type, func, s, ...) \ 486 ENSURE_MSAN_INITED(); \ 487 InterceptorScope interceptor_scope; \ 488 ret_type res = REAL(func)(s, __VA_ARGS__); \ 489 if (s) __msan_unpoison(s, sizeof(char_type) * (res + 1)); \ 490 return res; 491 492 INTERCEPTOR(SIZE_T, strftime, char *s, SIZE_T max, const char *format, 493 __sanitizer_tm *tm) { 494 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, strftime, s, max, format, tm); 495 } 496 497 INTERCEPTOR(SIZE_T, strftime_l, char *s, SIZE_T max, const char *format, 498 __sanitizer_tm *tm, void *loc) { 499 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, strftime_l, s, max, format, tm, loc); 500 } 501 502 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 503 INTERCEPTOR(SIZE_T, __strftime_l, char *s, SIZE_T max, const char *format, 504 __sanitizer_tm *tm, void *loc) { 505 INTERCEPTOR_STRFTIME_BODY(char, SIZE_T, __strftime_l, s, max, format, tm, 506 loc); 507 } 508 #define MSAN_MAYBE_INTERCEPT___STRFTIME_L INTERCEPT_FUNCTION(__strftime_l) 509 #else 510 #define MSAN_MAYBE_INTERCEPT___STRFTIME_L 511 #endif 512 513 INTERCEPTOR(SIZE_T, wcsftime, wchar_t *s, SIZE_T max, const wchar_t *format, 514 __sanitizer_tm *tm) { 515 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, wcsftime, s, max, format, tm); 516 } 517 518 INTERCEPTOR(SIZE_T, wcsftime_l, wchar_t *s, SIZE_T max, const wchar_t *format, 519 __sanitizer_tm *tm, void *loc) { 520 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, wcsftime_l, s, max, format, tm, 521 loc); 522 } 523 524 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 525 INTERCEPTOR(SIZE_T, __wcsftime_l, wchar_t *s, SIZE_T max, const wchar_t *format, 526 __sanitizer_tm *tm, void *loc) { 527 INTERCEPTOR_STRFTIME_BODY(wchar_t, SIZE_T, __wcsftime_l, s, max, format, tm, 528 loc); 529 } 530 #define MSAN_MAYBE_INTERCEPT___WCSFTIME_L INTERCEPT_FUNCTION(__wcsftime_l) 531 #else 532 #define MSAN_MAYBE_INTERCEPT___WCSFTIME_L 533 #endif 534 535 INTERCEPTOR(int, mbtowc, wchar_t *dest, const char *src, SIZE_T n) { 536 ENSURE_MSAN_INITED(); 537 int res = REAL(mbtowc)(dest, src, n); 538 if (res != -1 && dest) __msan_unpoison(dest, sizeof(wchar_t)); 539 return res; 540 } 541 542 INTERCEPTOR(SIZE_T, mbrtowc, wchar_t *dest, const char *src, SIZE_T n, 543 void *ps) { 544 ENSURE_MSAN_INITED(); 545 SIZE_T res = REAL(mbrtowc)(dest, src, n, ps); 546 if (res != (SIZE_T)-1 && dest) __msan_unpoison(dest, sizeof(wchar_t)); 547 return res; 548 } 549 550 // wchar_t *wmemcpy(wchar_t *dest, const wchar_t *src, SIZE_T n); 551 INTERCEPTOR(wchar_t *, wmemcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) { 552 ENSURE_MSAN_INITED(); 553 GET_STORE_STACK_TRACE; 554 wchar_t *res = REAL(wmemcpy)(dest, src, n); 555 CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack); 556 return res; 557 } 558 559 #if !SANITIZER_NETBSD 560 INTERCEPTOR(wchar_t *, wmempcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) { 561 ENSURE_MSAN_INITED(); 562 GET_STORE_STACK_TRACE; 563 wchar_t *res = REAL(wmempcpy)(dest, src, n); 564 CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack); 565 return res; 566 } 567 #define MSAN_MAYBE_INTERCEPT_WMEMPCPY INTERCEPT_FUNCTION(wmempcpy) 568 #else 569 #define MSAN_MAYBE_INTERCEPT_WMEMPCPY 570 #endif 571 572 INTERCEPTOR(wchar_t *, wmemset, wchar_t *s, wchar_t c, SIZE_T n) { 573 CHECK(MEM_IS_APP(s)); 574 ENSURE_MSAN_INITED(); 575 wchar_t *res = REAL(wmemset)(s, c, n); 576 __msan_unpoison(s, n * sizeof(wchar_t)); 577 return res; 578 } 579 580 INTERCEPTOR(wchar_t *, wmemmove, wchar_t *dest, const wchar_t *src, SIZE_T n) { 581 ENSURE_MSAN_INITED(); 582 GET_STORE_STACK_TRACE; 583 wchar_t *res = REAL(wmemmove)(dest, src, n); 584 MoveShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack); 585 return res; 586 } 587 588 INTERCEPTOR(int, wcscmp, const wchar_t *s1, const wchar_t *s2) { 589 ENSURE_MSAN_INITED(); 590 int res = REAL(wcscmp)(s1, s2); 591 return res; 592 } 593 594 INTERCEPTOR(int, gettimeofday, void *tv, void *tz) { 595 ENSURE_MSAN_INITED(); 596 int res = REAL(gettimeofday)(tv, tz); 597 if (tv) 598 __msan_unpoison(tv, 16); 599 if (tz) 600 __msan_unpoison(tz, 8); 601 return res; 602 } 603 604 #if !SANITIZER_NETBSD 605 INTERCEPTOR(char *, fcvt, double x, int a, int *b, int *c) { 606 ENSURE_MSAN_INITED(); 607 char *res = REAL(fcvt)(x, a, b, c); 608 __msan_unpoison(b, sizeof(*b)); 609 __msan_unpoison(c, sizeof(*c)); 610 if (res) 611 __msan_unpoison(res, internal_strlen(res) + 1); 612 return res; 613 } 614 #define MSAN_MAYBE_INTERCEPT_FCVT INTERCEPT_FUNCTION(fcvt) 615 #else 616 #define MSAN_MAYBE_INTERCEPT_FCVT 617 #endif 618 619 INTERCEPTOR(char *, getenv, char *name) { 620 if (msan_init_is_running) 621 return REAL(getenv)(name); 622 ENSURE_MSAN_INITED(); 623 char *res = REAL(getenv)(name); 624 if (res) 625 __msan_unpoison(res, internal_strlen(res) + 1); 626 return res; 627 } 628 629 extern char **environ; 630 631 static void UnpoisonEnviron() { 632 char **envp = environ; 633 for (; *envp; ++envp) { 634 __msan_unpoison(envp, sizeof(*envp)); 635 __msan_unpoison(*envp, internal_strlen(*envp) + 1); 636 } 637 // Trailing NULL pointer. 638 __msan_unpoison(envp, sizeof(*envp)); 639 } 640 641 INTERCEPTOR(int, setenv, const char *name, const char *value, int overwrite) { 642 ENSURE_MSAN_INITED(); 643 CHECK_UNPOISONED_STRING(name, 0); 644 int res = REAL(setenv)(name, value, overwrite); 645 if (!res) UnpoisonEnviron(); 646 return res; 647 } 648 649 INTERCEPTOR(int, putenv, char *string) { 650 ENSURE_MSAN_INITED(); 651 int res = REAL(putenv)(string); 652 if (!res) UnpoisonEnviron(); 653 return res; 654 } 655 656 #define SANITIZER_STAT_LINUX (SANITIZER_LINUX && __GLIBC_PREREQ(2, 33)) 657 #if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_STAT_LINUX 658 INTERCEPTOR(int, fstat, int fd, void *buf) { 659 ENSURE_MSAN_INITED(); 660 int res = REAL(fstat)(fd, buf); 661 if (!res) 662 __msan_unpoison(buf, __sanitizer::struct_stat_sz); 663 return res; 664 } 665 # define MSAN_MAYBE_INTERCEPT_FSTAT MSAN_INTERCEPT_FUNC(fstat) 666 #else 667 #define MSAN_MAYBE_INTERCEPT_FSTAT 668 #endif 669 670 #if SANITIZER_STAT_LINUX 671 INTERCEPTOR(int, fstat64, int fd, void *buf) { 672 ENSURE_MSAN_INITED(); 673 int res = REAL(fstat64)(fd, buf); 674 if (!res) 675 __msan_unpoison(buf, __sanitizer::struct_stat64_sz); 676 return res; 677 } 678 # define MSAN_MAYBE_INTERCEPT_FSTAT64 MSAN_INTERCEPT_FUNC(fstat64) 679 #else 680 # define MSAN_MAYBE_INTERCEPT_FSTAT64 681 #endif 682 683 #if SANITIZER_GLIBC 684 INTERCEPTOR(int, __fxstat, int magic, int fd, void *buf) { 685 ENSURE_MSAN_INITED(); 686 int res = REAL(__fxstat)(magic, fd, buf); 687 if (!res) 688 __msan_unpoison(buf, __sanitizer::struct_stat_sz); 689 return res; 690 } 691 # define MSAN_MAYBE_INTERCEPT___FXSTAT MSAN_INTERCEPT_FUNC(__fxstat) 692 #else 693 #define MSAN_MAYBE_INTERCEPT___FXSTAT 694 #endif 695 696 #if SANITIZER_GLIBC 697 INTERCEPTOR(int, __fxstat64, int magic, int fd, void *buf) { 698 ENSURE_MSAN_INITED(); 699 int res = REAL(__fxstat64)(magic, fd, buf); 700 if (!res) 701 __msan_unpoison(buf, __sanitizer::struct_stat64_sz); 702 return res; 703 } 704 # define MSAN_MAYBE_INTERCEPT___FXSTAT64 MSAN_INTERCEPT_FUNC(__fxstat64) 705 #else 706 # define MSAN_MAYBE_INTERCEPT___FXSTAT64 707 #endif 708 709 #if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_STAT_LINUX 710 INTERCEPTOR(int, fstatat, int fd, char *pathname, void *buf, int flags) { 711 ENSURE_MSAN_INITED(); 712 int res = REAL(fstatat)(fd, pathname, buf, flags); 713 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz); 714 return res; 715 } 716 # define MSAN_MAYBE_INTERCEPT_FSTATAT MSAN_INTERCEPT_FUNC(fstatat) 717 #else 718 # define MSAN_MAYBE_INTERCEPT_FSTATAT 719 #endif 720 721 #if SANITIZER_STAT_LINUX 722 INTERCEPTOR(int, fstatat64, int fd, char *pathname, void *buf, int flags) { 723 ENSURE_MSAN_INITED(); 724 int res = REAL(fstatat64)(fd, pathname, buf, flags); 725 if (!res) 726 __msan_unpoison(buf, __sanitizer::struct_stat64_sz); 727 return res; 728 } 729 # define MSAN_MAYBE_INTERCEPT_FSTATAT64 MSAN_INTERCEPT_FUNC(fstatat64) 730 #else 731 # define MSAN_MAYBE_INTERCEPT_FSTATAT64 732 #endif 733 734 #if SANITIZER_GLIBC 735 INTERCEPTOR(int, __fxstatat, int magic, int fd, char *pathname, void *buf, 736 int flags) { 737 ENSURE_MSAN_INITED(); 738 int res = REAL(__fxstatat)(magic, fd, pathname, buf, flags); 739 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz); 740 return res; 741 } 742 # define MSAN_MAYBE_INTERCEPT___FXSTATAT MSAN_INTERCEPT_FUNC(__fxstatat) 743 #else 744 # define MSAN_MAYBE_INTERCEPT___FXSTATAT 745 #endif 746 747 #if SANITIZER_GLIBC 748 INTERCEPTOR(int, __fxstatat64, int magic, int fd, char *pathname, void *buf, 749 int flags) { 750 ENSURE_MSAN_INITED(); 751 int res = REAL(__fxstatat64)(magic, fd, pathname, buf, flags); 752 if (!res) __msan_unpoison(buf, __sanitizer::struct_stat64_sz); 753 return res; 754 } 755 # define MSAN_MAYBE_INTERCEPT___FXSTATAT64 MSAN_INTERCEPT_FUNC(__fxstatat64) 756 #else 757 # define MSAN_MAYBE_INTERCEPT___FXSTATAT64 758 #endif 759 760 INTERCEPTOR(int, pipe, int pipefd[2]) { 761 if (msan_init_is_running) 762 return REAL(pipe)(pipefd); 763 ENSURE_MSAN_INITED(); 764 int res = REAL(pipe)(pipefd); 765 if (!res) 766 __msan_unpoison(pipefd, sizeof(int[2])); 767 return res; 768 } 769 770 INTERCEPTOR(int, pipe2, int pipefd[2], int flags) { 771 ENSURE_MSAN_INITED(); 772 int res = REAL(pipe2)(pipefd, flags); 773 if (!res) 774 __msan_unpoison(pipefd, sizeof(int[2])); 775 return res; 776 } 777 778 INTERCEPTOR(int, socketpair, int domain, int type, int protocol, int sv[2]) { 779 ENSURE_MSAN_INITED(); 780 int res = REAL(socketpair)(domain, type, protocol, sv); 781 if (!res) 782 __msan_unpoison(sv, sizeof(int[2])); 783 return res; 784 } 785 786 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 787 INTERCEPTOR(char *, fgets_unlocked, char *s, int size, void *stream) { 788 ENSURE_MSAN_INITED(); 789 char *res = REAL(fgets_unlocked)(s, size, stream); 790 if (res) 791 __msan_unpoison(s, internal_strlen(s) + 1); 792 return res; 793 } 794 #define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED INTERCEPT_FUNCTION(fgets_unlocked) 795 #else 796 #define MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED 797 #endif 798 799 #define INTERCEPTOR_GETRLIMIT_BODY(func, resource, rlim) \ 800 if (msan_init_is_running) \ 801 return REAL(getrlimit)(resource, rlim); \ 802 ENSURE_MSAN_INITED(); \ 803 int res = REAL(func)(resource, rlim); \ 804 if (!res) \ 805 __msan_unpoison(rlim, __sanitizer::struct_rlimit_sz); \ 806 return res 807 808 INTERCEPTOR(int, getrlimit, int resource, void *rlim) { 809 INTERCEPTOR_GETRLIMIT_BODY(getrlimit, resource, rlim); 810 } 811 812 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 813 INTERCEPTOR(int, __getrlimit, int resource, void *rlim) { 814 INTERCEPTOR_GETRLIMIT_BODY(__getrlimit, resource, rlim); 815 } 816 817 INTERCEPTOR(int, getrlimit64, int resource, void *rlim) { 818 if (msan_init_is_running) return REAL(getrlimit64)(resource, rlim); 819 ENSURE_MSAN_INITED(); 820 int res = REAL(getrlimit64)(resource, rlim); 821 if (!res) __msan_unpoison(rlim, __sanitizer::struct_rlimit64_sz); 822 return res; 823 } 824 825 INTERCEPTOR(int, prlimit, int pid, int resource, void *new_rlimit, 826 void *old_rlimit) { 827 if (msan_init_is_running) 828 return REAL(prlimit)(pid, resource, new_rlimit, old_rlimit); 829 ENSURE_MSAN_INITED(); 830 CHECK_UNPOISONED(new_rlimit, __sanitizer::struct_rlimit_sz); 831 int res = REAL(prlimit)(pid, resource, new_rlimit, old_rlimit); 832 if (!res) __msan_unpoison(old_rlimit, __sanitizer::struct_rlimit_sz); 833 return res; 834 } 835 836 INTERCEPTOR(int, prlimit64, int pid, int resource, void *new_rlimit, 837 void *old_rlimit) { 838 if (msan_init_is_running) 839 return REAL(prlimit64)(pid, resource, new_rlimit, old_rlimit); 840 ENSURE_MSAN_INITED(); 841 CHECK_UNPOISONED(new_rlimit, __sanitizer::struct_rlimit64_sz); 842 int res = REAL(prlimit64)(pid, resource, new_rlimit, old_rlimit); 843 if (!res) __msan_unpoison(old_rlimit, __sanitizer::struct_rlimit64_sz); 844 return res; 845 } 846 847 #define MSAN_MAYBE_INTERCEPT___GETRLIMIT INTERCEPT_FUNCTION(__getrlimit) 848 #define MSAN_MAYBE_INTERCEPT_GETRLIMIT64 INTERCEPT_FUNCTION(getrlimit64) 849 #define MSAN_MAYBE_INTERCEPT_PRLIMIT INTERCEPT_FUNCTION(prlimit) 850 #define MSAN_MAYBE_INTERCEPT_PRLIMIT64 INTERCEPT_FUNCTION(prlimit64) 851 #else 852 #define MSAN_MAYBE_INTERCEPT___GETRLIMIT 853 #define MSAN_MAYBE_INTERCEPT_GETRLIMIT64 854 #define MSAN_MAYBE_INTERCEPT_PRLIMIT 855 #define MSAN_MAYBE_INTERCEPT_PRLIMIT64 856 #endif 857 858 INTERCEPTOR(int, gethostname, char *name, SIZE_T len) { 859 ENSURE_MSAN_INITED(); 860 int res = REAL(gethostname)(name, len); 861 if (!res || (res == -1 && errno == errno_ENAMETOOLONG)) { 862 SIZE_T real_len = internal_strnlen(name, len); 863 if (real_len < len) 864 ++real_len; 865 __msan_unpoison(name, real_len); 866 } 867 return res; 868 } 869 870 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 871 INTERCEPTOR(int, epoll_wait, int epfd, void *events, int maxevents, 872 int timeout) { 873 ENSURE_MSAN_INITED(); 874 int res = REAL(epoll_wait)(epfd, events, maxevents, timeout); 875 if (res > 0) { 876 __msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res); 877 } 878 return res; 879 } 880 #define MSAN_MAYBE_INTERCEPT_EPOLL_WAIT INTERCEPT_FUNCTION(epoll_wait) 881 #else 882 #define MSAN_MAYBE_INTERCEPT_EPOLL_WAIT 883 #endif 884 885 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD 886 INTERCEPTOR(int, epoll_pwait, int epfd, void *events, int maxevents, 887 int timeout, void *sigmask) { 888 ENSURE_MSAN_INITED(); 889 int res = REAL(epoll_pwait)(epfd, events, maxevents, timeout, sigmask); 890 if (res > 0) { 891 __msan_unpoison(events, __sanitizer::struct_epoll_event_sz * res); 892 } 893 return res; 894 } 895 #define MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT INTERCEPT_FUNCTION(epoll_pwait) 896 #else 897 #define MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT 898 #endif 899 900 INTERCEPTOR(void *, calloc, SIZE_T nmemb, SIZE_T size) { 901 GET_MALLOC_STACK_TRACE; 902 if (DlsymAlloc::Use()) 903 return DlsymAlloc::Callocate(nmemb, size); 904 return msan_calloc(nmemb, size, &stack); 905 } 906 907 INTERCEPTOR(void *, realloc, void *ptr, SIZE_T size) { 908 if (DlsymAlloc::Use() || DlsymAlloc::PointerIsMine(ptr)) 909 return DlsymAlloc::Realloc(ptr, size); 910 GET_MALLOC_STACK_TRACE; 911 return msan_realloc(ptr, size, &stack); 912 } 913 914 INTERCEPTOR(void *, reallocarray, void *ptr, SIZE_T nmemb, SIZE_T size) { 915 GET_MALLOC_STACK_TRACE; 916 return msan_reallocarray(ptr, nmemb, size, &stack); 917 } 918 919 INTERCEPTOR(void *, malloc, SIZE_T size) { 920 if (DlsymAlloc::Use()) 921 return DlsymAlloc::Allocate(size); 922 GET_MALLOC_STACK_TRACE; 923 return msan_malloc(size, &stack); 924 } 925 926 void __msan_allocated_memory(const void *data, uptr size) { 927 if (flags()->poison_in_malloc) { 928 GET_MALLOC_STACK_TRACE; 929 stack.tag = STACK_TRACE_TAG_POISON; 930 PoisonMemory(data, size, &stack); 931 } 932 } 933 934 void __msan_copy_shadow(void *dest, const void *src, uptr n) { 935 GET_STORE_STACK_TRACE; 936 MoveShadowAndOrigin(dest, src, n, &stack); 937 } 938 939 void __sanitizer_dtor_callback(const void *data, uptr size) { 940 if (flags()->poison_in_dtor) { 941 GET_MALLOC_STACK_TRACE; 942 stack.tag = STACK_TRACE_TAG_POISON; 943 PoisonMemory(data, size, &stack); 944 } 945 } 946 947 template <class Mmap> 948 static void *mmap_interceptor(Mmap real_mmap, void *addr, SIZE_T length, 949 int prot, int flags, int fd, OFF64_T offset) { 950 SIZE_T rounded_length = RoundUpTo(length, GetPageSize()); 951 void *end_addr = (char *)addr + (rounded_length - 1); 952 if (addr && (!MEM_IS_APP(addr) || !MEM_IS_APP(end_addr))) { 953 if (flags & map_fixed) { 954 errno = errno_EINVAL; 955 return (void *)-1; 956 } else { 957 addr = nullptr; 958 } 959 } 960 void *res = real_mmap(addr, length, prot, flags, fd, offset); 961 if (res != (void *)-1) { 962 void *end_res = (char *)res + (rounded_length - 1); 963 if (MEM_IS_APP(res) && MEM_IS_APP(end_res)) { 964 __msan_unpoison(res, rounded_length); 965 } else { 966 // Application has attempted to map more memory than is supported by 967 // MSAN. Act as if we ran out of memory. 968 internal_munmap(res, length); 969 errno = errno_ENOMEM; 970 return (void *)-1; 971 } 972 } 973 return res; 974 } 975 976 INTERCEPTOR(int, getrusage, int who, void *usage) { 977 ENSURE_MSAN_INITED(); 978 int res = REAL(getrusage)(who, usage); 979 if (res == 0) { 980 __msan_unpoison(usage, __sanitizer::struct_rusage_sz); 981 } 982 return res; 983 } 984 985 class SignalHandlerScope { 986 public: 987 SignalHandlerScope() { 988 if (MsanThread *t = GetCurrentThread()) 989 t->EnterSignalHandler(); 990 } 991 ~SignalHandlerScope() { 992 if (MsanThread *t = GetCurrentThread()) 993 t->LeaveSignalHandler(); 994 } 995 }; 996 997 // sigactions_mu guarantees atomicity of sigaction() and signal() calls. 998 // Access to sigactions[] is gone with relaxed atomics to avoid data race with 999 // the signal handler. 1000 const int kMaxSignals = 1024; 1001 static atomic_uintptr_t sigactions[kMaxSignals]; 1002 static StaticSpinMutex sigactions_mu; 1003 1004 static void SignalHandler(int signo) { 1005 SignalHandlerScope signal_handler_scope; 1006 ScopedThreadLocalStateBackup stlsb; 1007 UnpoisonParam(1); 1008 1009 typedef void (*signal_cb)(int x); 1010 signal_cb cb = 1011 (signal_cb)atomic_load(&sigactions[signo], memory_order_relaxed); 1012 cb(signo); 1013 } 1014 1015 static void SignalAction(int signo, void *si, void *uc) { 1016 SignalHandlerScope signal_handler_scope; 1017 ScopedThreadLocalStateBackup stlsb; 1018 UnpoisonParam(3); 1019 __msan_unpoison(si, sizeof(__sanitizer_sigaction)); 1020 __msan_unpoison(uc, ucontext_t_sz(uc)); 1021 1022 typedef void (*sigaction_cb)(int, void *, void *); 1023 sigaction_cb cb = 1024 (sigaction_cb)atomic_load(&sigactions[signo], memory_order_relaxed); 1025 cb(signo, si, uc); 1026 CHECK_UNPOISONED(uc, ucontext_t_sz(uc)); 1027 } 1028 1029 static void read_sigaction(const __sanitizer_sigaction *act) { 1030 CHECK_UNPOISONED(&act->sa_flags, sizeof(act->sa_flags)); 1031 if (act->sa_flags & __sanitizer::sa_siginfo) 1032 CHECK_UNPOISONED(&act->sigaction, sizeof(act->sigaction)); 1033 else 1034 CHECK_UNPOISONED(&act->handler, sizeof(act->handler)); 1035 CHECK_UNPOISONED(&act->sa_mask, sizeof(act->sa_mask)); 1036 } 1037 1038 extern "C" int pthread_attr_init(void *attr); 1039 extern "C" int pthread_attr_destroy(void *attr); 1040 1041 static void *MsanThreadStartFunc(void *arg) { 1042 MsanThread *t = (MsanThread *)arg; 1043 SetCurrentThread(t); 1044 t->Init(); 1045 SetSigProcMask(&t->starting_sigset_, nullptr); 1046 return t->ThreadStart(); 1047 } 1048 1049 INTERCEPTOR(int, pthread_create, void *th, void *attr, void *(*callback)(void*), 1050 void * param) { 1051 ENSURE_MSAN_INITED(); // for GetTlsSize() 1052 __sanitizer_pthread_attr_t myattr; 1053 if (!attr) { 1054 pthread_attr_init(&myattr); 1055 attr = &myattr; 1056 } 1057 1058 AdjustStackSize(attr); 1059 1060 MsanThread *t = MsanThread::Create(callback, param); 1061 ScopedBlockSignals block(&t->starting_sigset_); 1062 int res = REAL(pthread_create)(th, attr, MsanThreadStartFunc, t); 1063 1064 if (attr == &myattr) 1065 pthread_attr_destroy(&myattr); 1066 if (!res) { 1067 __msan_unpoison(th, __sanitizer::pthread_t_sz); 1068 } 1069 return res; 1070 } 1071 1072 INTERCEPTOR(int, pthread_key_create, __sanitizer_pthread_key_t *key, 1073 void (*dtor)(void *value)) { 1074 if (msan_init_is_running) return REAL(pthread_key_create)(key, dtor); 1075 ENSURE_MSAN_INITED(); 1076 int res = REAL(pthread_key_create)(key, dtor); 1077 if (!res && key) 1078 __msan_unpoison(key, sizeof(*key)); 1079 return res; 1080 } 1081 1082 #if SANITIZER_NETBSD 1083 INTERCEPTOR(int, __libc_thr_keycreate, __sanitizer_pthread_key_t *m, 1084 void (*dtor)(void *value)) 1085 ALIAS(WRAPPER_NAME(pthread_key_create)); 1086 #endif 1087 1088 INTERCEPTOR(int, pthread_join, void *th, void **retval) { 1089 ENSURE_MSAN_INITED(); 1090 int res = REAL(pthread_join)(th, retval); 1091 if (!res && retval) 1092 __msan_unpoison(retval, sizeof(*retval)); 1093 return res; 1094 } 1095 1096 DEFINE_REAL_PTHREAD_FUNCTIONS 1097 1098 extern char *tzname[2]; 1099 1100 INTERCEPTOR(void, tzset, int fake) { 1101 ENSURE_MSAN_INITED(); 1102 InterceptorScope interceptor_scope; 1103 REAL(tzset)(fake); 1104 if (tzname[0]) 1105 __msan_unpoison(tzname[0], internal_strlen(tzname[0]) + 1); 1106 if (tzname[1]) 1107 __msan_unpoison(tzname[1], internal_strlen(tzname[1]) + 1); 1108 return; 1109 } 1110 1111 struct MSanAtExitRecord { 1112 void (*func)(void *arg); 1113 void *arg; 1114 }; 1115 1116 struct InterceptorContext { 1117 Mutex atexit_mu; 1118 Vector<struct MSanAtExitRecord *> AtExitStack; 1119 1120 InterceptorContext() 1121 : AtExitStack() { 1122 } 1123 }; 1124 1125 static ALIGNED(64) char interceptor_placeholder[sizeof(InterceptorContext)]; 1126 InterceptorContext *interceptor_ctx() { 1127 return reinterpret_cast<InterceptorContext*>(&interceptor_placeholder[0]); 1128 } 1129 1130 void MSanAtExitWrapper() { 1131 MSanAtExitRecord *r; 1132 { 1133 Lock l(&interceptor_ctx()->atexit_mu); 1134 1135 uptr element = interceptor_ctx()->AtExitStack.Size() - 1; 1136 r = interceptor_ctx()->AtExitStack[element]; 1137 interceptor_ctx()->AtExitStack.PopBack(); 1138 } 1139 1140 UnpoisonParam(1); 1141 ((void(*)())r->func)(); 1142 InternalFree(r); 1143 } 1144 1145 void MSanCxaAtExitWrapper(void *arg) { 1146 UnpoisonParam(1); 1147 MSanAtExitRecord *r = (MSanAtExitRecord *)arg; 1148 // libc before 2.27 had race which caused occasional double handler execution 1149 // https://sourceware.org/ml/libc-alpha/2017-08/msg01204.html 1150 if (!r->func) 1151 return; 1152 r->func(r->arg); 1153 r->func = nullptr; 1154 } 1155 1156 static int setup_at_exit_wrapper(void(*f)(), void *arg, void *dso); 1157 1158 // Unpoison argument shadow for C++ module destructors. 1159 INTERCEPTOR(int, __cxa_atexit, void (*func)(void *), void *arg, 1160 void *dso_handle) { 1161 if (msan_init_is_running) return REAL(__cxa_atexit)(func, arg, dso_handle); 1162 return setup_at_exit_wrapper((void(*)())func, arg, dso_handle); 1163 } 1164 1165 // Unpoison argument shadow for C++ module destructors. 1166 INTERCEPTOR(int, atexit, void (*func)()) { 1167 // Avoid calling real atexit as it is unreachable on at least on Linux. 1168 if (msan_init_is_running) 1169 return REAL(__cxa_atexit)((void (*)(void *a))func, 0, 0); 1170 return setup_at_exit_wrapper((void(*)())func, 0, 0); 1171 } 1172 1173 static int setup_at_exit_wrapper(void(*f)(), void *arg, void *dso) { 1174 ENSURE_MSAN_INITED(); 1175 MSanAtExitRecord *r = 1176 (MSanAtExitRecord *)InternalAlloc(sizeof(MSanAtExitRecord)); 1177 r->func = (void(*)(void *a))f; 1178 r->arg = arg; 1179 int res; 1180 if (!dso) { 1181 // NetBSD does not preserve the 2nd argument if dso is equal to 0 1182 // Store ctx in a local stack-like structure 1183 1184 Lock l(&interceptor_ctx()->atexit_mu); 1185 1186 res = REAL(__cxa_atexit)((void (*)(void *a))MSanAtExitWrapper, 0, 0); 1187 if (!res) { 1188 interceptor_ctx()->AtExitStack.PushBack(r); 1189 } 1190 } else { 1191 res = REAL(__cxa_atexit)(MSanCxaAtExitWrapper, r, dso); 1192 } 1193 return res; 1194 } 1195 1196 static void BeforeFork() { 1197 StackDepotLockAll(); 1198 ChainedOriginDepotLockAll(); 1199 } 1200 1201 static void AfterFork() { 1202 ChainedOriginDepotUnlockAll(); 1203 StackDepotUnlockAll(); 1204 } 1205 1206 INTERCEPTOR(int, fork, void) { 1207 ENSURE_MSAN_INITED(); 1208 BeforeFork(); 1209 int pid = REAL(fork)(); 1210 AfterFork(); 1211 return pid; 1212 } 1213 1214 // NetBSD ships with openpty(3) in -lutil, that needs to be prebuilt explicitly 1215 // with MSan. 1216 #if SANITIZER_LINUX 1217 INTERCEPTOR(int, openpty, int *aparent, int *aworker, char *name, 1218 const void *termp, const void *winp) { 1219 ENSURE_MSAN_INITED(); 1220 InterceptorScope interceptor_scope; 1221 int res = REAL(openpty)(aparent, aworker, name, termp, winp); 1222 if (!res) { 1223 __msan_unpoison(aparent, sizeof(*aparent)); 1224 __msan_unpoison(aworker, sizeof(*aworker)); 1225 } 1226 return res; 1227 } 1228 #define MSAN_MAYBE_INTERCEPT_OPENPTY INTERCEPT_FUNCTION(openpty) 1229 #else 1230 #define MSAN_MAYBE_INTERCEPT_OPENPTY 1231 #endif 1232 1233 // NetBSD ships with forkpty(3) in -lutil, that needs to be prebuilt explicitly 1234 // with MSan. 1235 #if SANITIZER_LINUX 1236 INTERCEPTOR(int, forkpty, int *aparent, char *name, const void *termp, 1237 const void *winp) { 1238 ENSURE_MSAN_INITED(); 1239 InterceptorScope interceptor_scope; 1240 int res = REAL(forkpty)(aparent, name, termp, winp); 1241 if (res != -1) 1242 __msan_unpoison(aparent, sizeof(*aparent)); 1243 return res; 1244 } 1245 #define MSAN_MAYBE_INTERCEPT_FORKPTY INTERCEPT_FUNCTION(forkpty) 1246 #else 1247 #define MSAN_MAYBE_INTERCEPT_FORKPTY 1248 #endif 1249 1250 struct MSanInterceptorContext { 1251 bool in_interceptor_scope; 1252 }; 1253 1254 namespace __msan { 1255 1256 int OnExit() { 1257 // FIXME: ask frontend whether we need to return failure. 1258 return 0; 1259 } 1260 1261 } // namespace __msan 1262 1263 // A version of CHECK_UNPOISONED using a saved scope value. Used in common 1264 // interceptors. 1265 #define CHECK_UNPOISONED_CTX(ctx, x, n) \ 1266 do { \ 1267 if (!((MSanInterceptorContext *)ctx)->in_interceptor_scope) \ 1268 CHECK_UNPOISONED_0(x, n); \ 1269 } while (0) 1270 1271 #define MSAN_INTERCEPT_FUNC(name) \ 1272 do { \ 1273 if (!INTERCEPT_FUNCTION(name)) \ 1274 VReport(1, "MemorySanitizer: failed to intercept '%s'\n", #name); \ 1275 } while (0) 1276 1277 #define MSAN_INTERCEPT_FUNC_VER(name, ver) \ 1278 do { \ 1279 if (!INTERCEPT_FUNCTION_VER(name, ver)) \ 1280 VReport(1, "MemorySanitizer: failed to intercept '%s@@%s'\n", #name, \ 1281 ver); \ 1282 } while (0) 1283 #define MSAN_INTERCEPT_FUNC_VER_UNVERSIONED_FALLBACK(name, ver) \ 1284 do { \ 1285 if (!INTERCEPT_FUNCTION_VER(name, ver) && !INTERCEPT_FUNCTION(name)) \ 1286 VReport(1, "MemorySanitizer: failed to intercept '%s@@%s' or '%s'\n", \ 1287 #name, ver, #name); \ 1288 } while (0) 1289 1290 #define COMMON_INTERCEPT_FUNCTION(name) MSAN_INTERCEPT_FUNC(name) 1291 #define COMMON_INTERCEPT_FUNCTION_VER(name, ver) \ 1292 MSAN_INTERCEPT_FUNC_VER(name, ver) 1293 #define COMMON_INTERCEPT_FUNCTION_VER_UNVERSIONED_FALLBACK(name, ver) \ 1294 MSAN_INTERCEPT_FUNC_VER_UNVERSIONED_FALLBACK(name, ver) 1295 #define COMMON_INTERCEPTOR_UNPOISON_PARAM(count) \ 1296 UnpoisonParam(count) 1297 #define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \ 1298 __msan_unpoison(ptr, size) 1299 #define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \ 1300 CHECK_UNPOISONED_CTX(ctx, ptr, size) 1301 #define COMMON_INTERCEPTOR_INITIALIZE_RANGE(ptr, size) \ 1302 __msan_unpoison(ptr, size) 1303 #define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \ 1304 if (msan_init_is_running) \ 1305 return REAL(func)(__VA_ARGS__); \ 1306 ENSURE_MSAN_INITED(); \ 1307 MSanInterceptorContext msan_ctx = {IsInInterceptorScope()}; \ 1308 ctx = (void *)&msan_ctx; \ 1309 (void)ctx; \ 1310 InterceptorScope interceptor_scope; \ 1311 __msan_unpoison(__errno_location(), sizeof(int)); 1312 #define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \ 1313 do { \ 1314 } while (false) 1315 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \ 1316 do { \ 1317 } while (false) 1318 #define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \ 1319 do { \ 1320 } while (false) 1321 #define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \ 1322 do { \ 1323 } while (false) 1324 #define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) \ 1325 do { \ 1326 } while (false) // FIXME 1327 #define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \ 1328 do { \ 1329 } while (false) // FIXME 1330 #define COMMON_INTERCEPTOR_BLOCK_REAL(name) REAL(name) 1331 #define COMMON_INTERCEPTOR_ON_EXIT(ctx) OnExit() 1332 #define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) \ 1333 do { \ 1334 link_map *map = GET_LINK_MAP_BY_DLOPEN_HANDLE((handle)); \ 1335 if (filename && map) \ 1336 ForEachMappedRegion(map, __msan_unpoison); \ 1337 } while (false) 1338 1339 #define COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED (!msan_inited) 1340 1341 #define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \ 1342 if (MsanThread *t = GetCurrentThread()) { \ 1343 *begin = t->tls_begin(); \ 1344 *end = t->tls_end(); \ 1345 } else { \ 1346 *begin = *end = 0; \ 1347 } 1348 1349 #define COMMON_INTERCEPTOR_MEMSET_IMPL(ctx, block, c, size) \ 1350 { \ 1351 (void)ctx; \ 1352 return __msan_memset(block, c, size); \ 1353 } 1354 #define COMMON_INTERCEPTOR_MEMMOVE_IMPL(ctx, to, from, size) \ 1355 { \ 1356 (void)ctx; \ 1357 return __msan_memmove(to, from, size); \ 1358 } 1359 #define COMMON_INTERCEPTOR_MEMCPY_IMPL(ctx, to, from, size) \ 1360 { \ 1361 (void)ctx; \ 1362 return __msan_memcpy(to, from, size); \ 1363 } 1364 1365 #define COMMON_INTERCEPTOR_COPY_STRING(ctx, to, from, size) \ 1366 do { \ 1367 GET_STORE_STACK_TRACE; \ 1368 CopyShadowAndOrigin(to, from, size, &stack); \ 1369 __msan_unpoison(to + size, 1); \ 1370 } while (false) 1371 1372 #define COMMON_INTERCEPTOR_MMAP_IMPL(ctx, mmap, addr, length, prot, flags, fd, \ 1373 offset) \ 1374 do { \ 1375 return mmap_interceptor(REAL(mmap), addr, sz, prot, flags, fd, off); \ 1376 } while (false) 1377 1378 #include "sanitizer_common/sanitizer_platform_interceptors.h" 1379 #include "sanitizer_common/sanitizer_common_interceptors.inc" 1380 1381 static uptr signal_impl(int signo, uptr cb); 1382 static int sigaction_impl(int signo, const __sanitizer_sigaction *act, 1383 __sanitizer_sigaction *oldact); 1384 1385 #define SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signo, act, oldact) \ 1386 { return sigaction_impl(signo, act, oldact); } 1387 1388 #define SIGNAL_INTERCEPTOR_SIGNAL_IMPL(func, signo, handler) \ 1389 { \ 1390 handler = signal_impl(signo, handler); \ 1391 InterceptorScope interceptor_scope; \ 1392 return REAL(func)(signo, handler); \ 1393 } 1394 1395 #include "sanitizer_common/sanitizer_signal_interceptors.inc" 1396 1397 static int sigaction_impl(int signo, const __sanitizer_sigaction *act, 1398 __sanitizer_sigaction *oldact) { 1399 ENSURE_MSAN_INITED(); 1400 if (signo <= 0 || signo >= kMaxSignals) { 1401 errno = errno_EINVAL; 1402 return -1; 1403 } 1404 if (act) read_sigaction(act); 1405 int res; 1406 if (flags()->wrap_signals) { 1407 SpinMutexLock lock(&sigactions_mu); 1408 uptr old_cb = atomic_load(&sigactions[signo], memory_order_relaxed); 1409 __sanitizer_sigaction new_act; 1410 __sanitizer_sigaction *pnew_act = act ? &new_act : nullptr; 1411 if (act) { 1412 REAL(memcpy)(pnew_act, act, sizeof(__sanitizer_sigaction)); 1413 uptr cb = (uptr)pnew_act->sigaction; 1414 uptr new_cb = (pnew_act->sa_flags & __sanitizer::sa_siginfo) 1415 ? (uptr)SignalAction 1416 : (uptr)SignalHandler; 1417 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) { 1418 atomic_store(&sigactions[signo], cb, memory_order_relaxed); 1419 pnew_act->sigaction = (decltype(pnew_act->sigaction))new_cb; 1420 } 1421 } 1422 res = REAL(SIGACTION_SYMNAME)(signo, pnew_act, oldact); 1423 if (res == 0 && oldact) { 1424 uptr cb = (uptr)oldact->sigaction; 1425 if (cb == (uptr)SignalAction || cb == (uptr)SignalHandler) { 1426 oldact->sigaction = (decltype(oldact->sigaction))old_cb; 1427 } 1428 } 1429 } else { 1430 res = REAL(SIGACTION_SYMNAME)(signo, act, oldact); 1431 } 1432 1433 if (res == 0 && oldact) { 1434 __msan_unpoison(oldact, sizeof(__sanitizer_sigaction)); 1435 } 1436 return res; 1437 } 1438 1439 static uptr signal_impl(int signo, uptr cb) { 1440 ENSURE_MSAN_INITED(); 1441 if (signo <= 0 || signo >= kMaxSignals) { 1442 errno = errno_EINVAL; 1443 return -1; 1444 } 1445 if (flags()->wrap_signals) { 1446 SpinMutexLock lock(&sigactions_mu); 1447 if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) { 1448 atomic_store(&sigactions[signo], cb, memory_order_relaxed); 1449 cb = (uptr)&SignalHandler; 1450 } 1451 } 1452 return cb; 1453 } 1454 1455 #define COMMON_SYSCALL_PRE_READ_RANGE(p, s) CHECK_UNPOISONED(p, s) 1456 #define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \ 1457 do { \ 1458 } while (false) 1459 #define COMMON_SYSCALL_POST_READ_RANGE(p, s) \ 1460 do { \ 1461 } while (false) 1462 #define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) __msan_unpoison(p, s) 1463 #include "sanitizer_common/sanitizer_common_syscalls.inc" 1464 #include "sanitizer_common/sanitizer_syscalls_netbsd.inc" 1465 1466 INTERCEPTOR(const char *, strsignal, int sig) { 1467 void *ctx; 1468 COMMON_INTERCEPTOR_ENTER(ctx, strsignal, sig); 1469 const char *res = REAL(strsignal)(sig); 1470 if (res) 1471 __msan_unpoison(res, internal_strlen(res) + 1); 1472 return res; 1473 } 1474 1475 struct dlinfo { 1476 char *dli_fname; 1477 void *dli_fbase; 1478 char *dli_sname; 1479 void *dli_saddr; 1480 }; 1481 1482 INTERCEPTOR(int, dladdr, void *addr, dlinfo *info) { 1483 void *ctx; 1484 COMMON_INTERCEPTOR_ENTER(ctx, dladdr, addr, info); 1485 int res = REAL(dladdr)(addr, info); 1486 if (res != 0) { 1487 __msan_unpoison(info, sizeof(*info)); 1488 if (info->dli_fname) 1489 __msan_unpoison(info->dli_fname, internal_strlen(info->dli_fname) + 1); 1490 if (info->dli_sname) 1491 __msan_unpoison(info->dli_sname, internal_strlen(info->dli_sname) + 1); 1492 } 1493 return res; 1494 } 1495 1496 INTERCEPTOR(char *, dlerror, int fake) { 1497 void *ctx; 1498 COMMON_INTERCEPTOR_ENTER(ctx, dlerror, fake); 1499 char *res = REAL(dlerror)(fake); 1500 if (res) 1501 __msan_unpoison(res, internal_strlen(res) + 1); 1502 return res; 1503 } 1504 1505 typedef int (*dl_iterate_phdr_cb)(__sanitizer_dl_phdr_info *info, SIZE_T size, 1506 void *data); 1507 struct dl_iterate_phdr_data { 1508 dl_iterate_phdr_cb callback; 1509 void *data; 1510 }; 1511 1512 static int msan_dl_iterate_phdr_cb(__sanitizer_dl_phdr_info *info, SIZE_T size, 1513 void *data) { 1514 if (info) { 1515 __msan_unpoison(info, size); 1516 if (info->dlpi_phdr && info->dlpi_phnum) 1517 __msan_unpoison(info->dlpi_phdr, struct_ElfW_Phdr_sz * info->dlpi_phnum); 1518 if (info->dlpi_name) 1519 __msan_unpoison(info->dlpi_name, internal_strlen(info->dlpi_name) + 1); 1520 } 1521 dl_iterate_phdr_data *cbdata = (dl_iterate_phdr_data *)data; 1522 UnpoisonParam(3); 1523 return cbdata->callback(info, size, cbdata->data); 1524 } 1525 1526 INTERCEPTOR(void *, shmat, int shmid, const void *shmaddr, int shmflg) { 1527 ENSURE_MSAN_INITED(); 1528 void *p = REAL(shmat)(shmid, shmaddr, shmflg); 1529 if (p != (void *)-1) { 1530 __sanitizer_shmid_ds ds; 1531 int res = REAL(shmctl)(shmid, shmctl_ipc_stat, &ds); 1532 if (!res) { 1533 __msan_unpoison(p, ds.shm_segsz); 1534 } 1535 } 1536 return p; 1537 } 1538 1539 INTERCEPTOR(int, dl_iterate_phdr, dl_iterate_phdr_cb callback, void *data) { 1540 void *ctx; 1541 COMMON_INTERCEPTOR_ENTER(ctx, dl_iterate_phdr, callback, data); 1542 dl_iterate_phdr_data cbdata; 1543 cbdata.callback = callback; 1544 cbdata.data = data; 1545 int res = REAL(dl_iterate_phdr)(msan_dl_iterate_phdr_cb, (void *)&cbdata); 1546 return res; 1547 } 1548 1549 // wchar_t *wcschr(const wchar_t *wcs, wchar_t wc); 1550 INTERCEPTOR(wchar_t *, wcschr, void *s, wchar_t wc, void *ps) { 1551 ENSURE_MSAN_INITED(); 1552 wchar_t *res = REAL(wcschr)(s, wc, ps); 1553 return res; 1554 } 1555 1556 // wchar_t *wcscpy(wchar_t *dest, const wchar_t *src); 1557 INTERCEPTOR(wchar_t *, wcscpy, wchar_t *dest, const wchar_t *src) { 1558 ENSURE_MSAN_INITED(); 1559 GET_STORE_STACK_TRACE; 1560 wchar_t *res = REAL(wcscpy)(dest, src); 1561 CopyShadowAndOrigin(dest, src, sizeof(wchar_t) * (internal_wcslen(src) + 1), 1562 &stack); 1563 return res; 1564 } 1565 1566 INTERCEPTOR(wchar_t *, wcsncpy, wchar_t *dest, const wchar_t *src, SIZE_T n) { 1567 ENSURE_MSAN_INITED(); 1568 GET_STORE_STACK_TRACE; 1569 SIZE_T copy_size = internal_wcsnlen(src, n); 1570 if (copy_size < n) copy_size++; // trailing \0 1571 wchar_t *res = REAL(wcsncpy)(dest, src, n); 1572 CopyShadowAndOrigin(dest, src, copy_size * sizeof(wchar_t), &stack); 1573 __msan_unpoison(dest + copy_size, (n - copy_size) * sizeof(wchar_t)); 1574 return res; 1575 } 1576 1577 // These interface functions reside here so that they can use 1578 // REAL(memset), etc. 1579 void __msan_unpoison(const void *a, uptr size) { 1580 if (!MEM_IS_APP(a)) return; 1581 SetShadow(a, size, 0); 1582 } 1583 1584 void __msan_poison(const void *a, uptr size) { 1585 if (!MEM_IS_APP(a)) return; 1586 SetShadow(a, size, __msan::flags()->poison_heap_with_zeroes ? 0 : -1); 1587 } 1588 1589 void __msan_poison_stack(void *a, uptr size) { 1590 if (!MEM_IS_APP(a)) return; 1591 SetShadow(a, size, __msan::flags()->poison_stack_with_zeroes ? 0 : -1); 1592 } 1593 1594 void __msan_unpoison_param(uptr n) { UnpoisonParam(n); } 1595 1596 void __msan_clear_and_unpoison(void *a, uptr size) { 1597 REAL(memset)(a, 0, size); 1598 SetShadow(a, size, 0); 1599 } 1600 1601 void *__msan_memcpy(void *dest, const void *src, SIZE_T n) { 1602 if (!msan_inited) return internal_memcpy(dest, src, n); 1603 if (msan_init_is_running || __msan::IsInSymbolizerOrUnwider()) 1604 return REAL(memcpy)(dest, src, n); 1605 ENSURE_MSAN_INITED(); 1606 GET_STORE_STACK_TRACE; 1607 void *res = REAL(memcpy)(dest, src, n); 1608 CopyShadowAndOrigin(dest, src, n, &stack); 1609 return res; 1610 } 1611 1612 void *__msan_memset(void *s, int c, SIZE_T n) { 1613 if (!msan_inited) return internal_memset(s, c, n); 1614 if (msan_init_is_running) return REAL(memset)(s, c, n); 1615 ENSURE_MSAN_INITED(); 1616 void *res = REAL(memset)(s, c, n); 1617 __msan_unpoison(s, n); 1618 return res; 1619 } 1620 1621 void *__msan_memmove(void *dest, const void *src, SIZE_T n) { 1622 if (!msan_inited) return internal_memmove(dest, src, n); 1623 if (msan_init_is_running) return REAL(memmove)(dest, src, n); 1624 ENSURE_MSAN_INITED(); 1625 GET_STORE_STACK_TRACE; 1626 void *res = REAL(memmove)(dest, src, n); 1627 MoveShadowAndOrigin(dest, src, n, &stack); 1628 return res; 1629 } 1630 1631 void __msan_unpoison_string(const char* s) { 1632 if (!MEM_IS_APP(s)) return; 1633 __msan_unpoison(s, internal_strlen(s) + 1); 1634 } 1635 1636 namespace __msan { 1637 1638 void InitializeInterceptors() { 1639 static int inited = 0; 1640 CHECK_EQ(inited, 0); 1641 1642 new(interceptor_ctx()) InterceptorContext(); 1643 1644 InitializeCommonInterceptors(); 1645 InitializeSignalInterceptors(); 1646 1647 INTERCEPT_FUNCTION(posix_memalign); 1648 MSAN_MAYBE_INTERCEPT_MEMALIGN; 1649 MSAN_MAYBE_INTERCEPT___LIBC_MEMALIGN; 1650 INTERCEPT_FUNCTION(valloc); 1651 MSAN_MAYBE_INTERCEPT_PVALLOC; 1652 INTERCEPT_FUNCTION(malloc); 1653 INTERCEPT_FUNCTION(calloc); 1654 INTERCEPT_FUNCTION(realloc); 1655 INTERCEPT_FUNCTION(reallocarray); 1656 INTERCEPT_FUNCTION(free); 1657 MSAN_MAYBE_INTERCEPT_CFREE; 1658 MSAN_MAYBE_INTERCEPT_MALLOC_USABLE_SIZE; 1659 MSAN_MAYBE_INTERCEPT_MALLINFO; 1660 MSAN_MAYBE_INTERCEPT_MALLOPT; 1661 MSAN_MAYBE_INTERCEPT_MALLOC_STATS; 1662 INTERCEPT_FUNCTION(fread); 1663 MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED; 1664 INTERCEPT_FUNCTION(memccpy); 1665 MSAN_MAYBE_INTERCEPT_MEMPCPY; 1666 INTERCEPT_FUNCTION(bcopy); 1667 INTERCEPT_FUNCTION(wmemset); 1668 INTERCEPT_FUNCTION(wmemcpy); 1669 MSAN_MAYBE_INTERCEPT_WMEMPCPY; 1670 INTERCEPT_FUNCTION(wmemmove); 1671 INTERCEPT_FUNCTION(strcpy); 1672 MSAN_MAYBE_INTERCEPT_STPCPY; 1673 INTERCEPT_FUNCTION(strdup); 1674 MSAN_MAYBE_INTERCEPT___STRDUP; 1675 INTERCEPT_FUNCTION(strncpy); 1676 MSAN_MAYBE_INTERCEPT_GCVT; 1677 INTERCEPT_FUNCTION(strcat); 1678 INTERCEPT_FUNCTION(strncat); 1679 INTERCEPT_STRTO(strtod); 1680 INTERCEPT_STRTO(strtof); 1681 INTERCEPT_STRTO(strtold); 1682 INTERCEPT_STRTO(strtol); 1683 INTERCEPT_STRTO(strtoul); 1684 INTERCEPT_STRTO(strtoll); 1685 INTERCEPT_STRTO(strtoull); 1686 INTERCEPT_STRTO(strtouq); 1687 INTERCEPT_STRTO(wcstod); 1688 INTERCEPT_STRTO(wcstof); 1689 INTERCEPT_STRTO(wcstold); 1690 INTERCEPT_STRTO(wcstol); 1691 INTERCEPT_STRTO(wcstoul); 1692 INTERCEPT_STRTO(wcstoll); 1693 INTERCEPT_STRTO(wcstoull); 1694 #ifdef SANITIZER_NLDBL_VERSION 1695 INTERCEPT_FUNCTION_VER(vswprintf, SANITIZER_NLDBL_VERSION); 1696 INTERCEPT_FUNCTION_VER(swprintf, SANITIZER_NLDBL_VERSION); 1697 #else 1698 INTERCEPT_FUNCTION(vswprintf); 1699 INTERCEPT_FUNCTION(swprintf); 1700 #endif 1701 INTERCEPT_FUNCTION(strftime); 1702 INTERCEPT_FUNCTION(strftime_l); 1703 MSAN_MAYBE_INTERCEPT___STRFTIME_L; 1704 INTERCEPT_FUNCTION(wcsftime); 1705 INTERCEPT_FUNCTION(wcsftime_l); 1706 MSAN_MAYBE_INTERCEPT___WCSFTIME_L; 1707 INTERCEPT_FUNCTION(mbtowc); 1708 INTERCEPT_FUNCTION(mbrtowc); 1709 INTERCEPT_FUNCTION(wcslen); 1710 INTERCEPT_FUNCTION(wcsnlen); 1711 INTERCEPT_FUNCTION(wcschr); 1712 INTERCEPT_FUNCTION(wcscpy); 1713 INTERCEPT_FUNCTION(wcsncpy); 1714 INTERCEPT_FUNCTION(wcscmp); 1715 INTERCEPT_FUNCTION(getenv); 1716 INTERCEPT_FUNCTION(setenv); 1717 INTERCEPT_FUNCTION(putenv); 1718 INTERCEPT_FUNCTION(gettimeofday); 1719 MSAN_MAYBE_INTERCEPT_FCVT; 1720 MSAN_MAYBE_INTERCEPT_FSTAT; 1721 MSAN_MAYBE_INTERCEPT_FSTAT64; 1722 MSAN_MAYBE_INTERCEPT___FXSTAT; 1723 MSAN_MAYBE_INTERCEPT_FSTATAT; 1724 MSAN_MAYBE_INTERCEPT_FSTATAT64; 1725 MSAN_MAYBE_INTERCEPT___FXSTATAT; 1726 MSAN_MAYBE_INTERCEPT___FXSTAT64; 1727 MSAN_MAYBE_INTERCEPT___FXSTATAT64; 1728 INTERCEPT_FUNCTION(pipe); 1729 INTERCEPT_FUNCTION(pipe2); 1730 INTERCEPT_FUNCTION(socketpair); 1731 MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED; 1732 INTERCEPT_FUNCTION(getrlimit); 1733 MSAN_MAYBE_INTERCEPT___GETRLIMIT; 1734 MSAN_MAYBE_INTERCEPT_GETRLIMIT64; 1735 MSAN_MAYBE_INTERCEPT_PRLIMIT; 1736 MSAN_MAYBE_INTERCEPT_PRLIMIT64; 1737 INTERCEPT_FUNCTION(gethostname); 1738 MSAN_MAYBE_INTERCEPT_EPOLL_WAIT; 1739 MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT; 1740 INTERCEPT_FUNCTION(strsignal); 1741 INTERCEPT_FUNCTION(dladdr); 1742 INTERCEPT_FUNCTION(dlerror); 1743 INTERCEPT_FUNCTION(dl_iterate_phdr); 1744 INTERCEPT_FUNCTION(getrusage); 1745 #if defined(__mips__) 1746 INTERCEPT_FUNCTION_VER(pthread_create, "GLIBC_2.2"); 1747 #else 1748 INTERCEPT_FUNCTION(pthread_create); 1749 #endif 1750 INTERCEPT_FUNCTION(pthread_join); 1751 INTERCEPT_FUNCTION(pthread_key_create); 1752 1753 #if SANITIZER_NETBSD 1754 INTERCEPT_FUNCTION(__libc_thr_keycreate); 1755 #endif 1756 1757 INTERCEPT_FUNCTION(pthread_join); 1758 INTERCEPT_FUNCTION(tzset); 1759 INTERCEPT_FUNCTION(atexit); 1760 INTERCEPT_FUNCTION(__cxa_atexit); 1761 INTERCEPT_FUNCTION(shmat); 1762 INTERCEPT_FUNCTION(fork); 1763 MSAN_MAYBE_INTERCEPT_OPENPTY; 1764 MSAN_MAYBE_INTERCEPT_FORKPTY; 1765 1766 inited = 1; 1767 } 1768 } // namespace __msan 1769