1 //===-- asan_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 AddressSanitizer, an address sanity checker. 10 // 11 // Intercept various libc functions. 12 //===----------------------------------------------------------------------===// 13 14 #include "asan_interceptors.h" 15 #include "asan_allocator.h" 16 #include "asan_internal.h" 17 #include "asan_mapping.h" 18 #include "asan_poisoning.h" 19 #include "asan_report.h" 20 #include "asan_stack.h" 21 #include "asan_stats.h" 22 #include "asan_suppressions.h" 23 #include "lsan/lsan_common.h" 24 #include "sanitizer_common/sanitizer_libc.h" 25 26 // There is no general interception at all on Fuchsia and RTEMS. 27 // Only the functions in asan_interceptors_memintrinsics.cpp are 28 // really defined to replace libc functions. 29 #if !SANITIZER_FUCHSIA && !SANITIZER_RTEMS 30 31 #if SANITIZER_POSIX 32 #include "sanitizer_common/sanitizer_posix.h" 33 #endif 34 35 #if ASAN_INTERCEPT__UNWIND_RAISEEXCEPTION || \ 36 ASAN_INTERCEPT__SJLJ_UNWIND_RAISEEXCEPTION 37 #include <unwind.h> 38 #endif 39 40 #if defined(__i386) && SANITIZER_LINUX 41 #define ASAN_PTHREAD_CREATE_VERSION "GLIBC_2.1" 42 #elif defined(__mips__) && SANITIZER_LINUX 43 #define ASAN_PTHREAD_CREATE_VERSION "GLIBC_2.2" 44 #endif 45 46 namespace __asan { 47 48 #define ASAN_READ_STRING_OF_LEN(ctx, s, len, n) \ 49 ASAN_READ_RANGE((ctx), (s), \ 50 common_flags()->strict_string_checks ? (len) + 1 : (n)) 51 52 #define ASAN_READ_STRING(ctx, s, n) \ 53 ASAN_READ_STRING_OF_LEN((ctx), (s), REAL(strlen)(s), (n)) 54 55 static inline uptr MaybeRealStrnlen(const char *s, uptr maxlen) { 56 #if SANITIZER_INTERCEPT_STRNLEN 57 if (REAL(strnlen)) { 58 return REAL(strnlen)(s, maxlen); 59 } 60 #endif 61 return internal_strnlen(s, maxlen); 62 } 63 64 void SetThreadName(const char *name) { 65 AsanThread *t = GetCurrentThread(); 66 if (t) 67 asanThreadRegistry().SetThreadName(t->tid(), name); 68 } 69 70 int OnExit() { 71 if (CAN_SANITIZE_LEAKS && common_flags()->detect_leaks && 72 __lsan::HasReportedLeaks()) { 73 return common_flags()->exitcode; 74 } 75 // FIXME: ask frontend whether we need to return failure. 76 return 0; 77 } 78 79 } // namespace __asan 80 81 // ---------------------- Wrappers ---------------- {{{1 82 using namespace __asan; 83 84 DECLARE_REAL_AND_INTERCEPTOR(void *, malloc, uptr) 85 DECLARE_REAL_AND_INTERCEPTOR(void, free, void *) 86 87 #define ASAN_INTERCEPTOR_ENTER(ctx, func) \ 88 AsanInterceptorContext _ctx = {#func}; \ 89 ctx = (void *)&_ctx; \ 90 (void) ctx; \ 91 92 #define COMMON_INTERCEPT_FUNCTION(name) ASAN_INTERCEPT_FUNC(name) 93 #define COMMON_INTERCEPT_FUNCTION_VER(name, ver) \ 94 ASAN_INTERCEPT_FUNC_VER(name, ver) 95 #define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \ 96 ASAN_WRITE_RANGE(ctx, ptr, size) 97 #define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \ 98 ASAN_READ_RANGE(ctx, ptr, size) 99 #define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \ 100 ASAN_INTERCEPTOR_ENTER(ctx, func); \ 101 do { \ 102 if (asan_init_is_running) \ 103 return REAL(func)(__VA_ARGS__); \ 104 if (SANITIZER_MAC && UNLIKELY(!asan_inited)) \ 105 return REAL(func)(__VA_ARGS__); \ 106 ENSURE_ASAN_INITED(); \ 107 } while (false) 108 #define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \ 109 do { \ 110 } while (false) 111 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \ 112 do { \ 113 } while (false) 114 #define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \ 115 do { \ 116 } while (false) 117 #define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \ 118 do { \ 119 } while (false) 120 #define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) SetThreadName(name) 121 // Should be asanThreadRegistry().SetThreadNameByUserId(thread, name) 122 // But asan does not remember UserId's for threads (pthread_t); 123 // and remembers all ever existed threads, so the linear search by UserId 124 // can be slow. 125 #define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name) \ 126 do { \ 127 } while (false) 128 #define COMMON_INTERCEPTOR_BLOCK_REAL(name) REAL(name) 129 // Strict init-order checking is dlopen-hostile: 130 // https://github.com/google/sanitizers/issues/178 131 #define COMMON_INTERCEPTOR_ON_DLOPEN(filename, flag) \ 132 do { \ 133 if (flags()->strict_init_order) \ 134 StopInitOrderChecking(); \ 135 CheckNoDeepBind(filename, flag); \ 136 } while (false) 137 #define COMMON_INTERCEPTOR_ON_EXIT(ctx) OnExit() 138 #define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) 139 #define COMMON_INTERCEPTOR_LIBRARY_UNLOADED() 140 #define COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED (!asan_inited) 141 #define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \ 142 if (AsanThread *t = GetCurrentThread()) { \ 143 *begin = t->tls_begin(); \ 144 *end = t->tls_end(); \ 145 } else { \ 146 *begin = *end = 0; \ 147 } 148 149 #define COMMON_INTERCEPTOR_MEMMOVE_IMPL(ctx, to, from, size) \ 150 do { \ 151 ASAN_INTERCEPTOR_ENTER(ctx, memmove); \ 152 ASAN_MEMMOVE_IMPL(ctx, to, from, size); \ 153 } while (false) 154 155 #define COMMON_INTERCEPTOR_MEMCPY_IMPL(ctx, to, from, size) \ 156 do { \ 157 ASAN_INTERCEPTOR_ENTER(ctx, memcpy); \ 158 ASAN_MEMCPY_IMPL(ctx, to, from, size); \ 159 } while (false) 160 161 #define COMMON_INTERCEPTOR_MEMSET_IMPL(ctx, block, c, size) \ 162 do { \ 163 ASAN_INTERCEPTOR_ENTER(ctx, memset); \ 164 ASAN_MEMSET_IMPL(ctx, block, c, size); \ 165 } while (false) 166 167 #if CAN_SANITIZE_LEAKS 168 #define COMMON_INTERCEPTOR_STRERROR() \ 169 __lsan::ScopedInterceptorDisabler disabler 170 #endif 171 172 #include "sanitizer_common/sanitizer_common_interceptors.inc" 173 #include "sanitizer_common/sanitizer_signal_interceptors.inc" 174 175 // Syscall interceptors don't have contexts, we don't support suppressions 176 // for them. 177 #define COMMON_SYSCALL_PRE_READ_RANGE(p, s) ASAN_READ_RANGE(nullptr, p, s) 178 #define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) ASAN_WRITE_RANGE(nullptr, p, s) 179 #define COMMON_SYSCALL_POST_READ_RANGE(p, s) \ 180 do { \ 181 (void)(p); \ 182 (void)(s); \ 183 } while (false) 184 #define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \ 185 do { \ 186 (void)(p); \ 187 (void)(s); \ 188 } while (false) 189 #include "sanitizer_common/sanitizer_common_syscalls.inc" 190 #include "sanitizer_common/sanitizer_syscalls_netbsd.inc" 191 192 #if ASAN_INTERCEPT_PTHREAD_CREATE 193 static thread_return_t THREAD_CALLING_CONV asan_thread_start(void *arg) { 194 AsanThread *t = (AsanThread *)arg; 195 SetCurrentThread(t); 196 return t->ThreadStart(GetTid()); 197 } 198 199 INTERCEPTOR(int, pthread_create, void *thread, 200 void *attr, void *(*start_routine)(void*), void *arg) { 201 EnsureMainThreadIDIsCorrect(); 202 // Strict init-order checking is thread-hostile. 203 if (flags()->strict_init_order) 204 StopInitOrderChecking(); 205 GET_STACK_TRACE_THREAD; 206 int detached = 0; 207 if (attr) 208 REAL(pthread_attr_getdetachstate)(attr, &detached); 209 210 u32 current_tid = GetCurrentTidOrInvalid(); 211 AsanThread *t = 212 AsanThread::Create(start_routine, arg, current_tid, &stack, detached); 213 214 int result; 215 { 216 // Ignore all allocations made by pthread_create: thread stack/TLS may be 217 // stored by pthread for future reuse even after thread destruction, and 218 // the linked list it's stored in doesn't even hold valid pointers to the 219 // objects, the latter are calculated by obscure pointer arithmetic. 220 #if CAN_SANITIZE_LEAKS 221 __lsan::ScopedInterceptorDisabler disabler; 222 #endif 223 result = REAL(pthread_create)(thread, attr, asan_thread_start, t); 224 } 225 if (result != 0) { 226 // If the thread didn't start delete the AsanThread to avoid leaking it. 227 // Note AsanThreadContexts never get destroyed so the AsanThreadContext 228 // that was just created for the AsanThread is wasted. 229 t->Destroy(); 230 } 231 return result; 232 } 233 234 INTERCEPTOR(int, pthread_join, void *t, void **arg) { 235 return real_pthread_join(t, arg); 236 } 237 238 DEFINE_REAL_PTHREAD_FUNCTIONS 239 #endif // ASAN_INTERCEPT_PTHREAD_CREATE 240 241 #if ASAN_INTERCEPT_SWAPCONTEXT 242 static void ClearShadowMemoryForContextStack(uptr stack, uptr ssize) { 243 // Align to page size. 244 uptr PageSize = GetPageSizeCached(); 245 uptr bottom = stack & ~(PageSize - 1); 246 ssize += stack - bottom; 247 ssize = RoundUpTo(ssize, PageSize); 248 static const uptr kMaxSaneContextStackSize = 1 << 22; // 4 Mb 249 if (AddrIsInMem(bottom) && ssize && ssize <= kMaxSaneContextStackSize) { 250 PoisonShadow(bottom, ssize, 0); 251 } 252 } 253 254 INTERCEPTOR(int, swapcontext, struct ucontext_t *oucp, 255 struct ucontext_t *ucp) { 256 static bool reported_warning = false; 257 if (!reported_warning) { 258 Report("WARNING: ASan doesn't fully support makecontext/swapcontext " 259 "functions and may produce false positives in some cases!\n"); 260 reported_warning = true; 261 } 262 // Clear shadow memory for new context (it may share stack 263 // with current context). 264 uptr stack, ssize; 265 ReadContextStack(ucp, &stack, &ssize); 266 ClearShadowMemoryForContextStack(stack, ssize); 267 #if __has_attribute(__indirect_return__) && \ 268 (defined(__x86_64__) || defined(__i386__)) 269 int (*real_swapcontext)(struct ucontext_t *, struct ucontext_t *) 270 __attribute__((__indirect_return__)) 271 = REAL(swapcontext); 272 int res = real_swapcontext(oucp, ucp); 273 #else 274 int res = REAL(swapcontext)(oucp, ucp); 275 #endif 276 // swapcontext technically does not return, but program may swap context to 277 // "oucp" later, that would look as if swapcontext() returned 0. 278 // We need to clear shadow for ucp once again, as it may be in arbitrary 279 // state. 280 ClearShadowMemoryForContextStack(stack, ssize); 281 return res; 282 } 283 #endif // ASAN_INTERCEPT_SWAPCONTEXT 284 285 #if SANITIZER_NETBSD 286 #define longjmp __longjmp14 287 #define siglongjmp __siglongjmp14 288 #endif 289 290 INTERCEPTOR(void, longjmp, void *env, int val) { 291 __asan_handle_no_return(); 292 REAL(longjmp)(env, val); 293 } 294 295 #if ASAN_INTERCEPT__LONGJMP 296 INTERCEPTOR(void, _longjmp, void *env, int val) { 297 __asan_handle_no_return(); 298 REAL(_longjmp)(env, val); 299 } 300 #endif 301 302 #if ASAN_INTERCEPT___LONGJMP_CHK 303 INTERCEPTOR(void, __longjmp_chk, void *env, int val) { 304 __asan_handle_no_return(); 305 REAL(__longjmp_chk)(env, val); 306 } 307 #endif 308 309 #if ASAN_INTERCEPT_SIGLONGJMP 310 INTERCEPTOR(void, siglongjmp, void *env, int val) { 311 __asan_handle_no_return(); 312 REAL(siglongjmp)(env, val); 313 } 314 #endif 315 316 #if ASAN_INTERCEPT___CXA_THROW 317 INTERCEPTOR(void, __cxa_throw, void *a, void *b, void *c) { 318 CHECK(REAL(__cxa_throw)); 319 __asan_handle_no_return(); 320 REAL(__cxa_throw)(a, b, c); 321 } 322 #endif 323 324 #if ASAN_INTERCEPT___CXA_RETHROW_PRIMARY_EXCEPTION 325 INTERCEPTOR(void, __cxa_rethrow_primary_exception, void *a) { 326 CHECK(REAL(__cxa_rethrow_primary_exception)); 327 __asan_handle_no_return(); 328 REAL(__cxa_rethrow_primary_exception)(a); 329 } 330 #endif 331 332 #if ASAN_INTERCEPT__UNWIND_RAISEEXCEPTION 333 INTERCEPTOR(_Unwind_Reason_Code, _Unwind_RaiseException, 334 _Unwind_Exception *object) { 335 CHECK(REAL(_Unwind_RaiseException)); 336 __asan_handle_no_return(); 337 return REAL(_Unwind_RaiseException)(object); 338 } 339 #endif 340 341 #if ASAN_INTERCEPT__SJLJ_UNWIND_RAISEEXCEPTION 342 INTERCEPTOR(_Unwind_Reason_Code, _Unwind_SjLj_RaiseException, 343 _Unwind_Exception *object) { 344 CHECK(REAL(_Unwind_SjLj_RaiseException)); 345 __asan_handle_no_return(); 346 return REAL(_Unwind_SjLj_RaiseException)(object); 347 } 348 #endif 349 350 #if ASAN_INTERCEPT_INDEX 351 # if ASAN_USE_ALIAS_ATTRIBUTE_FOR_INDEX 352 INTERCEPTOR(char*, index, const char *string, int c) 353 ALIAS(WRAPPER_NAME(strchr)); 354 # else 355 # if SANITIZER_MAC 356 DECLARE_REAL(char*, index, const char *string, int c) 357 OVERRIDE_FUNCTION(index, strchr); 358 # else 359 DEFINE_REAL(char*, index, const char *string, int c) 360 # endif 361 # endif 362 #endif // ASAN_INTERCEPT_INDEX 363 364 // For both strcat() and strncat() we need to check the validity of |to| 365 // argument irrespective of the |from| length. 366 INTERCEPTOR(char *, strcat, char *to, const char *from) { 367 void *ctx; 368 ASAN_INTERCEPTOR_ENTER(ctx, strcat); 369 ENSURE_ASAN_INITED(); 370 if (flags()->replace_str) { 371 uptr from_length = REAL(strlen)(from); 372 ASAN_READ_RANGE(ctx, from, from_length + 1); 373 uptr to_length = REAL(strlen)(to); 374 ASAN_READ_STRING_OF_LEN(ctx, to, to_length, to_length); 375 ASAN_WRITE_RANGE(ctx, to + to_length, from_length + 1); 376 // If the copying actually happens, the |from| string should not overlap 377 // with the resulting string starting at |to|, which has a length of 378 // to_length + from_length + 1. 379 if (from_length > 0) { 380 CHECK_RANGES_OVERLAP("strcat", to, from_length + to_length + 1, from, 381 from_length + 1); 382 } 383 } 384 return REAL(strcat)(to, from); 385 } 386 387 INTERCEPTOR(char*, strncat, char *to, const char *from, uptr size) { 388 void *ctx; 389 ASAN_INTERCEPTOR_ENTER(ctx, strncat); 390 ENSURE_ASAN_INITED(); 391 if (flags()->replace_str) { 392 uptr from_length = MaybeRealStrnlen(from, size); 393 uptr copy_length = Min(size, from_length + 1); 394 ASAN_READ_RANGE(ctx, from, copy_length); 395 uptr to_length = REAL(strlen)(to); 396 ASAN_READ_STRING_OF_LEN(ctx, to, to_length, to_length); 397 ASAN_WRITE_RANGE(ctx, to + to_length, from_length + 1); 398 if (from_length > 0) { 399 CHECK_RANGES_OVERLAP("strncat", to, to_length + copy_length + 1, 400 from, copy_length); 401 } 402 } 403 return REAL(strncat)(to, from, size); 404 } 405 406 INTERCEPTOR(char *, strcpy, char *to, const char *from) { 407 void *ctx; 408 ASAN_INTERCEPTOR_ENTER(ctx, strcpy); 409 #if SANITIZER_MAC 410 if (UNLIKELY(!asan_inited)) 411 return REAL(strcpy)(to, from); 412 #endif 413 // strcpy is called from malloc_default_purgeable_zone() 414 // in __asan::ReplaceSystemAlloc() on Mac. 415 if (asan_init_is_running) { 416 return REAL(strcpy)(to, from); 417 } 418 ENSURE_ASAN_INITED(); 419 if (flags()->replace_str) { 420 uptr from_size = REAL(strlen)(from) + 1; 421 CHECK_RANGES_OVERLAP("strcpy", to, from_size, from, from_size); 422 ASAN_READ_RANGE(ctx, from, from_size); 423 ASAN_WRITE_RANGE(ctx, to, from_size); 424 } 425 return REAL(strcpy)(to, from); 426 } 427 428 INTERCEPTOR(char*, strdup, const char *s) { 429 void *ctx; 430 ASAN_INTERCEPTOR_ENTER(ctx, strdup); 431 if (UNLIKELY(!asan_inited)) return internal_strdup(s); 432 ENSURE_ASAN_INITED(); 433 uptr length = REAL(strlen)(s); 434 if (flags()->replace_str) { 435 ASAN_READ_RANGE(ctx, s, length + 1); 436 } 437 GET_STACK_TRACE_MALLOC; 438 void *new_mem = asan_malloc(length + 1, &stack); 439 REAL(memcpy)(new_mem, s, length + 1); 440 return reinterpret_cast<char*>(new_mem); 441 } 442 443 #if ASAN_INTERCEPT___STRDUP 444 INTERCEPTOR(char*, __strdup, const char *s) { 445 void *ctx; 446 ASAN_INTERCEPTOR_ENTER(ctx, strdup); 447 if (UNLIKELY(!asan_inited)) return internal_strdup(s); 448 ENSURE_ASAN_INITED(); 449 uptr length = REAL(strlen)(s); 450 if (flags()->replace_str) { 451 ASAN_READ_RANGE(ctx, s, length + 1); 452 } 453 GET_STACK_TRACE_MALLOC; 454 void *new_mem = asan_malloc(length + 1, &stack); 455 REAL(memcpy)(new_mem, s, length + 1); 456 return reinterpret_cast<char*>(new_mem); 457 } 458 #endif // ASAN_INTERCEPT___STRDUP 459 460 INTERCEPTOR(char*, strncpy, char *to, const char *from, uptr size) { 461 void *ctx; 462 ASAN_INTERCEPTOR_ENTER(ctx, strncpy); 463 ENSURE_ASAN_INITED(); 464 if (flags()->replace_str) { 465 uptr from_size = Min(size, MaybeRealStrnlen(from, size) + 1); 466 CHECK_RANGES_OVERLAP("strncpy", to, from_size, from, from_size); 467 ASAN_READ_RANGE(ctx, from, from_size); 468 ASAN_WRITE_RANGE(ctx, to, size); 469 } 470 return REAL(strncpy)(to, from, size); 471 } 472 473 INTERCEPTOR(long, strtol, const char *nptr, char **endptr, int base) { 474 void *ctx; 475 ASAN_INTERCEPTOR_ENTER(ctx, strtol); 476 ENSURE_ASAN_INITED(); 477 if (!flags()->replace_str) { 478 return REAL(strtol)(nptr, endptr, base); 479 } 480 char *real_endptr; 481 long result = REAL(strtol)(nptr, &real_endptr, base); 482 StrtolFixAndCheck(ctx, nptr, endptr, real_endptr, base); 483 return result; 484 } 485 486 INTERCEPTOR(int, atoi, const char *nptr) { 487 void *ctx; 488 ASAN_INTERCEPTOR_ENTER(ctx, atoi); 489 #if SANITIZER_MAC 490 if (UNLIKELY(!asan_inited)) return REAL(atoi)(nptr); 491 #endif 492 ENSURE_ASAN_INITED(); 493 if (!flags()->replace_str) { 494 return REAL(atoi)(nptr); 495 } 496 char *real_endptr; 497 // "man atoi" tells that behavior of atoi(nptr) is the same as 498 // strtol(nptr, 0, 10), i.e. it sets errno to ERANGE if the 499 // parsed integer can't be stored in *long* type (even if it's 500 // different from int). So, we just imitate this behavior. 501 int result = REAL(strtol)(nptr, &real_endptr, 10); 502 FixRealStrtolEndptr(nptr, &real_endptr); 503 ASAN_READ_STRING(ctx, nptr, (real_endptr - nptr) + 1); 504 return result; 505 } 506 507 INTERCEPTOR(long, atol, const char *nptr) { 508 void *ctx; 509 ASAN_INTERCEPTOR_ENTER(ctx, atol); 510 #if SANITIZER_MAC 511 if (UNLIKELY(!asan_inited)) return REAL(atol)(nptr); 512 #endif 513 ENSURE_ASAN_INITED(); 514 if (!flags()->replace_str) { 515 return REAL(atol)(nptr); 516 } 517 char *real_endptr; 518 long result = REAL(strtol)(nptr, &real_endptr, 10); 519 FixRealStrtolEndptr(nptr, &real_endptr); 520 ASAN_READ_STRING(ctx, nptr, (real_endptr - nptr) + 1); 521 return result; 522 } 523 524 #if ASAN_INTERCEPT_ATOLL_AND_STRTOLL 525 INTERCEPTOR(long long, strtoll, const char *nptr, char **endptr, int base) { 526 void *ctx; 527 ASAN_INTERCEPTOR_ENTER(ctx, strtoll); 528 ENSURE_ASAN_INITED(); 529 if (!flags()->replace_str) { 530 return REAL(strtoll)(nptr, endptr, base); 531 } 532 char *real_endptr; 533 long long result = REAL(strtoll)(nptr, &real_endptr, base); 534 StrtolFixAndCheck(ctx, nptr, endptr, real_endptr, base); 535 return result; 536 } 537 538 INTERCEPTOR(long long, atoll, const char *nptr) { 539 void *ctx; 540 ASAN_INTERCEPTOR_ENTER(ctx, atoll); 541 ENSURE_ASAN_INITED(); 542 if (!flags()->replace_str) { 543 return REAL(atoll)(nptr); 544 } 545 char *real_endptr; 546 long long result = REAL(strtoll)(nptr, &real_endptr, 10); 547 FixRealStrtolEndptr(nptr, &real_endptr); 548 ASAN_READ_STRING(ctx, nptr, (real_endptr - nptr) + 1); 549 return result; 550 } 551 #endif // ASAN_INTERCEPT_ATOLL_AND_STRTOLL 552 553 #if ASAN_INTERCEPT___CXA_ATEXIT || ASAN_INTERCEPT_ATEXIT 554 static void AtCxaAtexit(void *unused) { 555 (void)unused; 556 StopInitOrderChecking(); 557 } 558 #endif 559 560 #if ASAN_INTERCEPT___CXA_ATEXIT 561 INTERCEPTOR(int, __cxa_atexit, void (*func)(void *), void *arg, 562 void *dso_handle) { 563 #if SANITIZER_MAC 564 if (UNLIKELY(!asan_inited)) return REAL(__cxa_atexit)(func, arg, dso_handle); 565 #endif 566 ENSURE_ASAN_INITED(); 567 #if CAN_SANITIZE_LEAKS 568 __lsan::ScopedInterceptorDisabler disabler; 569 #endif 570 int res = REAL(__cxa_atexit)(func, arg, dso_handle); 571 REAL(__cxa_atexit)(AtCxaAtexit, nullptr, nullptr); 572 return res; 573 } 574 #endif // ASAN_INTERCEPT___CXA_ATEXIT 575 576 #if ASAN_INTERCEPT_ATEXIT 577 INTERCEPTOR(int, atexit, void (*func)()) { 578 ENSURE_ASAN_INITED(); 579 #if CAN_SANITIZE_LEAKS 580 __lsan::ScopedInterceptorDisabler disabler; 581 #endif 582 // Avoid calling real atexit as it is unrechable on at least on Linux. 583 int res = REAL(__cxa_atexit)((void (*)(void *a))func, nullptr, nullptr); 584 REAL(__cxa_atexit)(AtCxaAtexit, nullptr, nullptr); 585 return res; 586 } 587 #endif 588 589 #if ASAN_INTERCEPT_PTHREAD_ATFORK 590 extern "C" { 591 extern int _pthread_atfork(void (*prepare)(), void (*parent)(), 592 void (*child)()); 593 }; 594 595 INTERCEPTOR(int, pthread_atfork, void (*prepare)(), void (*parent)(), 596 void (*child)()) { 597 #if CAN_SANITIZE_LEAKS 598 __lsan::ScopedInterceptorDisabler disabler; 599 #endif 600 // REAL(pthread_atfork) cannot be called due to symbol indirections at least 601 // on NetBSD 602 return _pthread_atfork(prepare, parent, child); 603 } 604 #endif 605 606 #if ASAN_INTERCEPT_VFORK 607 DEFINE_REAL(int, vfork) 608 DECLARE_EXTERN_INTERCEPTOR_AND_WRAPPER(int, vfork) 609 #endif 610 611 // ---------------------- InitializeAsanInterceptors ---------------- {{{1 612 namespace __asan { 613 void InitializeAsanInterceptors() { 614 static bool was_called_once; 615 CHECK(!was_called_once); 616 was_called_once = true; 617 InitializeCommonInterceptors(); 618 InitializeSignalInterceptors(); 619 620 // Intercept str* functions. 621 ASAN_INTERCEPT_FUNC(strcat); 622 ASAN_INTERCEPT_FUNC(strcpy); 623 ASAN_INTERCEPT_FUNC(strncat); 624 ASAN_INTERCEPT_FUNC(strncpy); 625 ASAN_INTERCEPT_FUNC(strdup); 626 #if ASAN_INTERCEPT___STRDUP 627 ASAN_INTERCEPT_FUNC(__strdup); 628 #endif 629 #if ASAN_INTERCEPT_INDEX && ASAN_USE_ALIAS_ATTRIBUTE_FOR_INDEX 630 ASAN_INTERCEPT_FUNC(index); 631 #endif 632 633 ASAN_INTERCEPT_FUNC(atoi); 634 ASAN_INTERCEPT_FUNC(atol); 635 ASAN_INTERCEPT_FUNC(strtol); 636 #if ASAN_INTERCEPT_ATOLL_AND_STRTOLL 637 ASAN_INTERCEPT_FUNC(atoll); 638 ASAN_INTERCEPT_FUNC(strtoll); 639 #endif 640 641 // Intecept jump-related functions. 642 ASAN_INTERCEPT_FUNC(longjmp); 643 644 #if ASAN_INTERCEPT_SWAPCONTEXT 645 ASAN_INTERCEPT_FUNC(swapcontext); 646 #endif 647 #if ASAN_INTERCEPT__LONGJMP 648 ASAN_INTERCEPT_FUNC(_longjmp); 649 #endif 650 #if ASAN_INTERCEPT___LONGJMP_CHK 651 ASAN_INTERCEPT_FUNC(__longjmp_chk); 652 #endif 653 #if ASAN_INTERCEPT_SIGLONGJMP 654 ASAN_INTERCEPT_FUNC(siglongjmp); 655 #endif 656 657 // Intercept exception handling functions. 658 #if ASAN_INTERCEPT___CXA_THROW 659 ASAN_INTERCEPT_FUNC(__cxa_throw); 660 #endif 661 #if ASAN_INTERCEPT___CXA_RETHROW_PRIMARY_EXCEPTION 662 ASAN_INTERCEPT_FUNC(__cxa_rethrow_primary_exception); 663 #endif 664 // Indirectly intercept std::rethrow_exception. 665 #if ASAN_INTERCEPT__UNWIND_RAISEEXCEPTION 666 INTERCEPT_FUNCTION(_Unwind_RaiseException); 667 #endif 668 // Indirectly intercept std::rethrow_exception. 669 #if ASAN_INTERCEPT__UNWIND_SJLJ_RAISEEXCEPTION 670 INTERCEPT_FUNCTION(_Unwind_SjLj_RaiseException); 671 #endif 672 673 // Intercept threading-related functions 674 #if ASAN_INTERCEPT_PTHREAD_CREATE 675 #if defined(ASAN_PTHREAD_CREATE_VERSION) 676 ASAN_INTERCEPT_FUNC_VER(pthread_create, ASAN_PTHREAD_CREATE_VERSION); 677 #else 678 ASAN_INTERCEPT_FUNC(pthread_create); 679 #endif 680 ASAN_INTERCEPT_FUNC(pthread_join); 681 #endif 682 683 // Intercept atexit function. 684 #if ASAN_INTERCEPT___CXA_ATEXIT 685 ASAN_INTERCEPT_FUNC(__cxa_atexit); 686 #endif 687 688 #if ASAN_INTERCEPT_ATEXIT 689 ASAN_INTERCEPT_FUNC(atexit); 690 #endif 691 692 #if ASAN_INTERCEPT_PTHREAD_ATFORK 693 ASAN_INTERCEPT_FUNC(pthread_atfork); 694 #endif 695 696 #if ASAN_INTERCEPT_VFORK 697 ASAN_INTERCEPT_FUNC(vfork); 698 #endif 699 700 InitializePlatformInterceptors(); 701 702 VReport(1, "AddressSanitizer: libc interceptors initialized\n"); 703 } 704 705 } // namespace __asan 706 707 #endif // !SANITIZER_FUCHSIA 708