asan_interceptors.cc revision d865fecddccebf898ceed24d096fc58fb29a6e57
1//===-- asan_interceptors.cc ----------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file is a part of AddressSanitizer, an address sanity checker. 11// 12// Intercept various libc functions. 13//===----------------------------------------------------------------------===// 14#include "asan_interceptors.h" 15 16#include "asan_allocator.h" 17#include "asan_intercepted_functions.h" 18#include "asan_internal.h" 19#include "asan_mapping.h" 20#include "asan_report.h" 21#include "asan_stack.h" 22#include "asan_stats.h" 23#include "asan_thread_registry.h" 24#include "interception/interception.h" 25#include "sanitizer/asan_interface.h" 26#include "sanitizer_common/sanitizer_libc.h" 27 28namespace __asan { 29 30// Instruments read/write access to a single byte in memory. 31// On error calls __asan_report_error, which aborts the program. 32#define ACCESS_ADDRESS(address, isWrite) do { \ 33 if (!AddrIsInMem(address) || AddressIsPoisoned(address)) { \ 34 GET_CURRENT_PC_BP_SP; \ 35 __asan_report_error(pc, bp, sp, address, isWrite, /* access_size */ 1); \ 36 } \ 37} while (0) 38 39// We implement ACCESS_MEMORY_RANGE, ASAN_READ_RANGE, 40// and ASAN_WRITE_RANGE as macro instead of function so 41// that no extra frames are created, and stack trace contains 42// relevant information only. 43 44// Instruments read/write access to a memory range. 45// More complex implementation is possible, for now just 46// checking the first and the last byte of a range. 47#define ACCESS_MEMORY_RANGE(offset, size, isWrite) do { \ 48 if (size > 0) { \ 49 uptr ptr = (uptr)(offset); \ 50 ACCESS_ADDRESS(ptr, isWrite); \ 51 ACCESS_ADDRESS(ptr + (size) - 1, isWrite); \ 52 } \ 53} while (0) 54 55#define ASAN_READ_RANGE(offset, size) do { \ 56 ACCESS_MEMORY_RANGE(offset, size, false); \ 57} while (0) 58 59#define ASAN_WRITE_RANGE(offset, size) do { \ 60 ACCESS_MEMORY_RANGE(offset, size, true); \ 61} while (0) 62 63// Behavior of functions like "memcpy" or "strcpy" is undefined 64// if memory intervals overlap. We report error in this case. 65// Macro is used to avoid creation of new frames. 66static inline bool RangesOverlap(const char *offset1, uptr length1, 67 const char *offset2, uptr length2) { 68 return !((offset1 + length1 <= offset2) || (offset2 + length2 <= offset1)); 69} 70#define CHECK_RANGES_OVERLAP(name, _offset1, length1, _offset2, length2) do { \ 71 const char *offset1 = (const char*)_offset1; \ 72 const char *offset2 = (const char*)_offset2; \ 73 if (RangesOverlap(offset1, length1, offset2, length2)) { \ 74 GET_STACK_TRACE_HERE(kStackTraceMax); \ 75 ReportStringFunctionMemoryRangesOverlap(name, offset1, length1, \ 76 offset2, length2, &stack); \ 77 } \ 78} while (0) 79 80#define ENSURE_ASAN_INITED() do { \ 81 CHECK(!asan_init_is_running); \ 82 if (!asan_inited) { \ 83 __asan_init(); \ 84 } \ 85} while (0) 86 87static inline uptr MaybeRealStrnlen(const char *s, uptr maxlen) { 88#if ASAN_INTERCEPT_STRNLEN 89 if (REAL(strnlen) != 0) { 90 return REAL(strnlen)(s, maxlen); 91 } 92#endif 93 return internal_strnlen(s, maxlen); 94} 95 96} // namespace __asan 97 98// ---------------------- Wrappers ---------------- {{{1 99using namespace __asan; // NOLINT 100 101static thread_return_t THREAD_CALLING_CONV asan_thread_start(void *arg) { 102 AsanThread *t = (AsanThread*)arg; 103 asanThreadRegistry().SetCurrent(t); 104 return t->ThreadStart(); 105} 106 107#if ASAN_INTERCEPT_PTHREAD_CREATE 108INTERCEPTOR(int, pthread_create, void *thread, 109 void *attr, void *(*start_routine)(void*), void *arg) { 110 GET_STACK_TRACE_HERE(kStackTraceMax); 111 u32 current_tid = asanThreadRegistry().GetCurrentTidOrInvalid(); 112 AsanThread *t = AsanThread::Create(current_tid, start_routine, arg, &stack); 113 asanThreadRegistry().RegisterThread(t); 114 return REAL(pthread_create)(thread, attr, asan_thread_start, t); 115} 116#endif // ASAN_INTERCEPT_PTHREAD_CREATE 117 118#if ASAN_INTERCEPT_SIGNAL_AND_SIGACTION 119INTERCEPTOR(void*, signal, int signum, void *handler) { 120 if (!AsanInterceptsSignal(signum)) { 121 return REAL(signal)(signum, handler); 122 } 123 return 0; 124} 125 126INTERCEPTOR(int, sigaction, int signum, const struct sigaction *act, 127 struct sigaction *oldact) { 128 if (!AsanInterceptsSignal(signum)) { 129 return REAL(sigaction)(signum, act, oldact); 130 } 131 return 0; 132} 133#elif ASAN_POSIX 134// We need to have defined REAL(sigaction) on posix systems. 135DEFINE_REAL(int, sigaction, int signum, const struct sigaction *act, 136 struct sigaction *oldact); 137#endif // ASAN_INTERCEPT_SIGNAL_AND_SIGACTION 138 139INTERCEPTOR(void, longjmp, void *env, int val) { 140 __asan_handle_no_return(); 141 REAL(longjmp)(env, val); 142} 143 144#if ASAN_INTERCEPT__LONGJMP 145INTERCEPTOR(void, _longjmp, void *env, int val) { 146 __asan_handle_no_return(); 147 REAL(_longjmp)(env, val); 148} 149#endif 150 151#if ASAN_INTERCEPT_SIGLONGJMP 152INTERCEPTOR(void, siglongjmp, void *env, int val) { 153 __asan_handle_no_return(); 154 REAL(siglongjmp)(env, val); 155} 156#endif 157 158#if ASAN_INTERCEPT___CXA_THROW 159INTERCEPTOR(void, __cxa_throw, void *a, void *b, void *c) { 160 CHECK(REAL(__cxa_throw)); 161 __asan_handle_no_return(); 162 REAL(__cxa_throw)(a, b, c); 163} 164#endif 165 166// intercept mlock and friends. 167// Since asan maps 16T of RAM, mlock is completely unfriendly to asan. 168// All functions return 0 (success). 169static void MlockIsUnsupported() { 170 static bool printed = 0; 171 if (printed) return; 172 printed = true; 173 Printf("INFO: AddressSanitizer ignores mlock/mlockall/munlock/munlockall\n"); 174} 175 176extern "C" { 177INTERCEPTOR(int, mlock, const void *addr, uptr len) { 178 MlockIsUnsupported(); 179 return 0; 180} 181 182INTERCEPTOR(int, munlock, const void *addr, uptr len) { 183 MlockIsUnsupported(); 184 return 0; 185} 186 187INTERCEPTOR(int, mlockall, int flags) { 188 MlockIsUnsupported(); 189 return 0; 190} 191 192INTERCEPTOR(int, munlockall, void) { 193 MlockIsUnsupported(); 194 return 0; 195} 196} // extern "C" 197 198static inline int CharCmp(unsigned char c1, unsigned char c2) { 199 return (c1 == c2) ? 0 : (c1 < c2) ? -1 : 1; 200} 201 202static inline int CharCaseCmp(unsigned char c1, unsigned char c2) { 203 int c1_low = ToLower(c1); 204 int c2_low = ToLower(c2); 205 return c1_low - c2_low; 206} 207 208INTERCEPTOR(int, memcmp, const void *a1, const void *a2, uptr size) { 209#if MAC_INTERPOSE_FUNCTIONS 210 if (!asan_inited) return REAL(memcmp)(a1, a2, size); 211#endif 212 ENSURE_ASAN_INITED(); 213 unsigned char c1 = 0, c2 = 0; 214 const unsigned char *s1 = (const unsigned char*)a1; 215 const unsigned char *s2 = (const unsigned char*)a2; 216 uptr i; 217 for (i = 0; i < size; i++) { 218 c1 = s1[i]; 219 c2 = s2[i]; 220 if (c1 != c2) break; 221 } 222 ASAN_READ_RANGE(s1, Min(i + 1, size)); 223 ASAN_READ_RANGE(s2, Min(i + 1, size)); 224 return CharCmp(c1, c2); 225} 226 227INTERCEPTOR(void*, memcpy, void *to, const void *from, uptr size) { 228 // memcpy is called during __asan_init() from the internals 229 // of printf(...). 230 if (asan_init_is_running) { 231 return REAL(memcpy)(to, from, size); 232 } 233 ENSURE_ASAN_INITED(); 234 if (flags()->replace_intrin) { 235 if (to != from) { 236 // We do not treat memcpy with to==from as a bug. 237 // See http://llvm.org/bugs/show_bug.cgi?id=11763. 238 CHECK_RANGES_OVERLAP("memcpy", to, size, from, size); 239 } 240 ASAN_WRITE_RANGE(from, size); 241 ASAN_READ_RANGE(to, size); 242 } 243 return REAL(memcpy)(to, from, size); 244} 245 246INTERCEPTOR(void*, memmove, void *to, const void *from, uptr size) { 247 if (asan_init_is_running) { 248 return REAL(memmove)(to, from, size); 249 } 250 ENSURE_ASAN_INITED(); 251 if (flags()->replace_intrin) { 252 ASAN_WRITE_RANGE(from, size); 253 ASAN_READ_RANGE(to, size); 254 } 255 return REAL(memmove)(to, from, size); 256} 257 258INTERCEPTOR(void*, memset, void *block, int c, uptr size) { 259 // memset is called inside Printf. 260 if (asan_init_is_running) { 261 return REAL(memset)(block, c, size); 262 } 263 ENSURE_ASAN_INITED(); 264 if (flags()->replace_intrin) { 265 ASAN_WRITE_RANGE(block, size); 266 } 267 return REAL(memset)(block, c, size); 268} 269 270INTERCEPTOR(char*, strchr, const char *str, int c) { 271#if MAC_INTERPOSE_FUNCTIONS 272 if (!asan_inited) return REAL(strchr)(str, c); 273#endif 274 ENSURE_ASAN_INITED(); 275 char *result = REAL(strchr)(str, c); 276 if (flags()->replace_str) { 277 uptr bytes_read = (result ? result - str : REAL(strlen)(str)) + 1; 278 ASAN_READ_RANGE(str, bytes_read); 279 } 280 return result; 281} 282 283#if ASAN_INTERCEPT_INDEX 284# if ASAN_USE_ALIAS_ATTRIBUTE_FOR_INDEX 285INTERCEPTOR(char*, index, const char *string, int c) 286 ALIAS(WRAPPER_NAME(strchr)); 287# else 288DEFINE_REAL(char*, index, const char *string, int c) 289# endif 290#endif // ASAN_INTERCEPT_INDEX 291 292// For both strcat() and strncat() we need to check the validity of |to| 293// argument irrespective of the |from| length. 294INTERCEPTOR(char*, strcat, char *to, const char *from) { // NOLINT 295 ENSURE_ASAN_INITED(); 296 if (flags()->replace_str) { 297 uptr from_length = REAL(strlen)(from); 298 ASAN_READ_RANGE(from, from_length + 1); 299 uptr to_length = REAL(strlen)(to); 300 ASAN_READ_RANGE(to, to_length); 301 ASAN_WRITE_RANGE(to + to_length, from_length + 1); 302 // If the copying actually happens, the |from| string should not overlap 303 // with the resulting string starting at |to|, which has a length of 304 // to_length + from_length + 1. 305 if (from_length > 0) { 306 CHECK_RANGES_OVERLAP("strcat", to, from_length + to_length + 1, 307 from, from_length + 1); 308 } 309 } 310 return REAL(strcat)(to, from); // NOLINT 311} 312 313INTERCEPTOR(char*, strncat, char *to, const char *from, uptr size) { 314 ENSURE_ASAN_INITED(); 315 if (flags()->replace_str) { 316 uptr from_length = MaybeRealStrnlen(from, size); 317 uptr copy_length = Min(size, from_length + 1); 318 ASAN_READ_RANGE(from, copy_length); 319 uptr to_length = REAL(strlen)(to); 320 ASAN_READ_RANGE(to, to_length); 321 ASAN_WRITE_RANGE(to + to_length, from_length + 1); 322 if (from_length > 0) { 323 CHECK_RANGES_OVERLAP("strncat", to, to_length + copy_length + 1, 324 from, copy_length); 325 } 326 } 327 return REAL(strncat)(to, from, size); 328} 329 330INTERCEPTOR(int, strcmp, const char *s1, const char *s2) { 331#if MAC_INTERPOSE_FUNCTIONS 332 if (!asan_inited) return REAL(strcmp)(s1, s2); 333#endif 334 if (asan_init_is_running) { 335 return REAL(strcmp)(s1, s2); 336 } 337 ENSURE_ASAN_INITED(); 338 unsigned char c1, c2; 339 uptr i; 340 for (i = 0; ; i++) { 341 c1 = (unsigned char)s1[i]; 342 c2 = (unsigned char)s2[i]; 343 if (c1 != c2 || c1 == '\0') break; 344 } 345 ASAN_READ_RANGE(s1, i + 1); 346 ASAN_READ_RANGE(s2, i + 1); 347 return CharCmp(c1, c2); 348} 349 350INTERCEPTOR(char*, strcpy, char *to, const char *from) { // NOLINT 351#if MAC_INTERPOSE_FUNCTIONS 352 if (!asan_inited) return REAL(strcpy)(to, from); // NOLINT 353#endif 354 // strcpy is called from malloc_default_purgeable_zone() 355 // in __asan::ReplaceSystemAlloc() on Mac. 356 if (asan_init_is_running) { 357 return REAL(strcpy)(to, from); // NOLINT 358 } 359 ENSURE_ASAN_INITED(); 360 if (flags()->replace_str) { 361 uptr from_size = REAL(strlen)(from) + 1; 362 CHECK_RANGES_OVERLAP("strcpy", to, from_size, from, from_size); 363 ASAN_READ_RANGE(from, from_size); 364 ASAN_WRITE_RANGE(to, from_size); 365 } 366 return REAL(strcpy)(to, from); // NOLINT 367} 368 369#if ASAN_INTERCEPT_STRDUP 370INTERCEPTOR(char*, strdup, const char *s) { 371#if MAC_INTERPOSE_FUNCTIONS 372 if (!asan_inited) return REAL(strdup)(s); 373#endif 374 ENSURE_ASAN_INITED(); 375 if (flags()->replace_str) { 376 uptr length = REAL(strlen)(s); 377 ASAN_READ_RANGE(s, length + 1); 378 } 379 return REAL(strdup)(s); 380} 381#endif 382 383INTERCEPTOR(uptr, strlen, const char *s) { 384#if MAC_INTERPOSE_FUNCTIONS 385 if (!asan_inited) return REAL(strlen)(s); 386#endif 387 // strlen is called from malloc_default_purgeable_zone() 388 // in __asan::ReplaceSystemAlloc() on Mac. 389 if (asan_init_is_running) { 390 return REAL(strlen)(s); 391 } 392 ENSURE_ASAN_INITED(); 393 uptr length = REAL(strlen)(s); 394 if (flags()->replace_str) { 395 ASAN_READ_RANGE(s, length + 1); 396 } 397 return length; 398} 399 400#if ASAN_INTERCEPT_STRCASECMP_AND_STRNCASECMP 401INTERCEPTOR(int, strcasecmp, const char *s1, const char *s2) { 402 ENSURE_ASAN_INITED(); 403 unsigned char c1, c2; 404 uptr i; 405 for (i = 0; ; i++) { 406 c1 = (unsigned char)s1[i]; 407 c2 = (unsigned char)s2[i]; 408 if (CharCaseCmp(c1, c2) != 0 || c1 == '\0') break; 409 } 410 ASAN_READ_RANGE(s1, i + 1); 411 ASAN_READ_RANGE(s2, i + 1); 412 return CharCaseCmp(c1, c2); 413} 414 415INTERCEPTOR(int, strncasecmp, const char *s1, const char *s2, uptr n) { 416 ENSURE_ASAN_INITED(); 417 unsigned char c1 = 0, c2 = 0; 418 uptr i; 419 for (i = 0; i < n; i++) { 420 c1 = (unsigned char)s1[i]; 421 c2 = (unsigned char)s2[i]; 422 if (CharCaseCmp(c1, c2) != 0 || c1 == '\0') break; 423 } 424 ASAN_READ_RANGE(s1, Min(i + 1, n)); 425 ASAN_READ_RANGE(s2, Min(i + 1, n)); 426 return CharCaseCmp(c1, c2); 427} 428#endif // ASAN_INTERCEPT_STRCASECMP_AND_STRNCASECMP 429 430INTERCEPTOR(int, strncmp, const char *s1, const char *s2, uptr size) { 431#if MAC_INTERPOSE_FUNCTIONS 432 if (!asan_inited) return REAL(strncmp)(s1, s2, size); 433#endif 434 // strncmp is called from malloc_default_purgeable_zone() 435 // in __asan::ReplaceSystemAlloc() on Mac. 436 if (asan_init_is_running) { 437 return REAL(strncmp)(s1, s2, size); 438 } 439 ENSURE_ASAN_INITED(); 440 unsigned char c1 = 0, c2 = 0; 441 uptr i; 442 for (i = 0; i < size; i++) { 443 c1 = (unsigned char)s1[i]; 444 c2 = (unsigned char)s2[i]; 445 if (c1 != c2 || c1 == '\0') break; 446 } 447 ASAN_READ_RANGE(s1, Min(i + 1, size)); 448 ASAN_READ_RANGE(s2, Min(i + 1, size)); 449 return CharCmp(c1, c2); 450} 451 452INTERCEPTOR(char*, strncpy, char *to, const char *from, uptr size) { 453 ENSURE_ASAN_INITED(); 454 if (flags()->replace_str) { 455 uptr from_size = Min(size, MaybeRealStrnlen(from, size) + 1); 456 CHECK_RANGES_OVERLAP("strncpy", to, from_size, from, from_size); 457 ASAN_READ_RANGE(from, from_size); 458 ASAN_WRITE_RANGE(to, size); 459 } 460 return REAL(strncpy)(to, from, size); 461} 462 463#if ASAN_INTERCEPT_STRNLEN 464INTERCEPTOR(uptr, strnlen, const char *s, uptr maxlen) { 465 ENSURE_ASAN_INITED(); 466 uptr length = REAL(strnlen)(s, maxlen); 467 if (flags()->replace_str) { 468 ASAN_READ_RANGE(s, Min(length + 1, maxlen)); 469 } 470 return length; 471} 472#endif // ASAN_INTERCEPT_STRNLEN 473 474static inline bool IsValidStrtolBase(int base) { 475 return (base == 0) || (2 <= base && base <= 36); 476} 477 478static inline void FixRealStrtolEndptr(const char *nptr, char **endptr) { 479 CHECK(endptr != 0); 480 if (nptr == *endptr) { 481 // No digits were found at strtol call, we need to find out the last 482 // symbol accessed by strtoll on our own. 483 // We get this symbol by skipping leading blanks and optional +/- sign. 484 while (IsSpace(*nptr)) nptr++; 485 if (*nptr == '+' || *nptr == '-') nptr++; 486 *endptr = (char*)nptr; 487 } 488 CHECK(*endptr >= nptr); 489} 490 491INTERCEPTOR(long, strtol, const char *nptr, // NOLINT 492 char **endptr, int base) { 493 ENSURE_ASAN_INITED(); 494 if (!flags()->replace_str) { 495 return REAL(strtol)(nptr, endptr, base); 496 } 497 char *real_endptr; 498 long result = REAL(strtol)(nptr, &real_endptr, base); // NOLINT 499 if (endptr != 0) { 500 *endptr = real_endptr; 501 } 502 if (IsValidStrtolBase(base)) { 503 FixRealStrtolEndptr(nptr, &real_endptr); 504 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 505 } 506 return result; 507} 508 509INTERCEPTOR(int, atoi, const char *nptr) { 510#if MAC_INTERPOSE_FUNCTIONS 511 if (!asan_inited) return REAL(atoi)(nptr); 512#endif 513 ENSURE_ASAN_INITED(); 514 if (!flags()->replace_str) { 515 return REAL(atoi)(nptr); 516 } 517 char *real_endptr; 518 // "man atoi" tells that behavior of atoi(nptr) is the same as 519 // strtol(nptr, 0, 10), i.e. it sets errno to ERANGE if the 520 // parsed integer can't be stored in *long* type (even if it's 521 // different from int). So, we just imitate this behavior. 522 int result = REAL(strtol)(nptr, &real_endptr, 10); 523 FixRealStrtolEndptr(nptr, &real_endptr); 524 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 525 return result; 526} 527 528INTERCEPTOR(long, atol, const char *nptr) { // NOLINT 529#if MAC_INTERPOSE_FUNCTIONS 530 if (!asan_inited) return REAL(atol)(nptr); 531#endif 532 ENSURE_ASAN_INITED(); 533 if (!flags()->replace_str) { 534 return REAL(atol)(nptr); 535 } 536 char *real_endptr; 537 long result = REAL(strtol)(nptr, &real_endptr, 10); // NOLINT 538 FixRealStrtolEndptr(nptr, &real_endptr); 539 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 540 return result; 541} 542 543#if ASAN_INTERCEPT_ATOLL_AND_STRTOLL 544INTERCEPTOR(long long, strtoll, const char *nptr, // NOLINT 545 char **endptr, int base) { 546 ENSURE_ASAN_INITED(); 547 if (!flags()->replace_str) { 548 return REAL(strtoll)(nptr, endptr, base); 549 } 550 char *real_endptr; 551 long long result = REAL(strtoll)(nptr, &real_endptr, base); // NOLINT 552 if (endptr != 0) { 553 *endptr = real_endptr; 554 } 555 // If base has unsupported value, strtoll can exit with EINVAL 556 // without reading any characters. So do additional checks only 557 // if base is valid. 558 if (IsValidStrtolBase(base)) { 559 FixRealStrtolEndptr(nptr, &real_endptr); 560 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 561 } 562 return result; 563} 564 565INTERCEPTOR(long long, atoll, const char *nptr) { // NOLINT 566 ENSURE_ASAN_INITED(); 567 if (!flags()->replace_str) { 568 return REAL(atoll)(nptr); 569 } 570 char *real_endptr; 571 long long result = REAL(strtoll)(nptr, &real_endptr, 10); // NOLINT 572 FixRealStrtolEndptr(nptr, &real_endptr); 573 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 574 return result; 575} 576#endif // ASAN_INTERCEPT_ATOLL_AND_STRTOLL 577 578#define ASAN_INTERCEPT_FUNC(name) do { \ 579 if (!INTERCEPT_FUNCTION(name) && flags()->verbosity > 0) \ 580 Report("AddressSanitizer: failed to intercept '" #name "'\n"); \ 581 } while (0) 582 583#if defined(_WIN32) 584INTERCEPTOR_WINAPI(DWORD, CreateThread, 585 void* security, uptr stack_size, 586 DWORD (__stdcall *start_routine)(void*), void* arg, 587 DWORD flags, void* tid) { 588 GET_STACK_TRACE_HERE(kStackTraceMax); 589 u32 current_tid = asanThreadRegistry().GetCurrentTidOrInvalid(); 590 AsanThread *t = AsanThread::Create(current_tid, start_routine, arg, &stack); 591 asanThreadRegistry().RegisterThread(t); 592 return REAL(CreateThread)(security, stack_size, 593 asan_thread_start, t, flags, tid); 594} 595 596namespace __asan { 597void InitializeWindowsInterceptors() { 598 ASAN_INTERCEPT_FUNC(CreateThread); 599} 600 601} // namespace __asan 602#endif 603 604// ---------------------- InitializeAsanInterceptors ---------------- {{{1 605namespace __asan { 606void InitializeAsanInterceptors() { 607 static bool was_called_once; 608 CHECK(was_called_once == false); 609 was_called_once = true; 610#if MAC_INTERPOSE_FUNCTIONS 611 return; 612#endif 613 // Intercept mem* functions. 614 ASAN_INTERCEPT_FUNC(memcmp); 615 ASAN_INTERCEPT_FUNC(memmove); 616 ASAN_INTERCEPT_FUNC(memset); 617 if (PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE) { 618 ASAN_INTERCEPT_FUNC(memcpy); 619 } else { 620#if !MAC_INTERPOSE_FUNCTIONS 621 // If we're using dynamic interceptors on Mac, these two are just plain 622 // functions. 623 *(uptr*)&REAL(memcpy) = (uptr)REAL(memmove); 624#endif 625 } 626 627 // Intercept str* functions. 628 ASAN_INTERCEPT_FUNC(strcat); // NOLINT 629 ASAN_INTERCEPT_FUNC(strchr); 630 ASAN_INTERCEPT_FUNC(strcmp); 631 ASAN_INTERCEPT_FUNC(strcpy); // NOLINT 632 ASAN_INTERCEPT_FUNC(strlen); 633 ASAN_INTERCEPT_FUNC(strncat); 634 ASAN_INTERCEPT_FUNC(strncmp); 635 ASAN_INTERCEPT_FUNC(strncpy); 636#if ASAN_INTERCEPT_STRCASECMP_AND_STRNCASECMP 637 ASAN_INTERCEPT_FUNC(strcasecmp); 638 ASAN_INTERCEPT_FUNC(strncasecmp); 639#endif 640#if ASAN_INTERCEPT_STRDUP 641 ASAN_INTERCEPT_FUNC(strdup); 642#endif 643#if ASAN_INTERCEPT_STRNLEN 644 ASAN_INTERCEPT_FUNC(strnlen); 645#endif 646#if ASAN_INTERCEPT_INDEX 647# if ASAN_USE_ALIAS_ATTRIBUTE_FOR_INDEX 648 ASAN_INTERCEPT_FUNC(index); 649# else 650 CHECK(OVERRIDE_FUNCTION(index, WRAP(strchr))); 651# endif 652#endif 653 654 ASAN_INTERCEPT_FUNC(atoi); 655 ASAN_INTERCEPT_FUNC(atol); 656 ASAN_INTERCEPT_FUNC(strtol); 657#if ASAN_INTERCEPT_ATOLL_AND_STRTOLL 658 ASAN_INTERCEPT_FUNC(atoll); 659 ASAN_INTERCEPT_FUNC(strtoll); 660#endif 661 662#if ASAN_INTERCEPT_MLOCKX 663 // Intercept mlock/munlock. 664 ASAN_INTERCEPT_FUNC(mlock); 665 ASAN_INTERCEPT_FUNC(munlock); 666 ASAN_INTERCEPT_FUNC(mlockall); 667 ASAN_INTERCEPT_FUNC(munlockall); 668#endif 669 670 // Intecept signal- and jump-related functions. 671 ASAN_INTERCEPT_FUNC(longjmp); 672#if ASAN_INTERCEPT_SIGNAL_AND_SIGACTION 673 ASAN_INTERCEPT_FUNC(sigaction); 674 ASAN_INTERCEPT_FUNC(signal); 675#endif 676#if ASAN_INTERCEPT__LONGJMP 677 ASAN_INTERCEPT_FUNC(_longjmp); 678#endif 679#if ASAN_INTERCEPT_SIGLONGJMP 680 ASAN_INTERCEPT_FUNC(siglongjmp); 681#endif 682 683 // Intercept exception handling functions. 684#if ASAN_INTERCEPT___CXA_THROW 685 INTERCEPT_FUNCTION(__cxa_throw); 686#endif 687 688 // Intercept threading-related functions 689#if ASAN_INTERCEPT_PTHREAD_CREATE 690 ASAN_INTERCEPT_FUNC(pthread_create); 691#endif 692 693 // Some Windows-specific interceptors. 694#if defined(_WIN32) 695 InitializeWindowsInterceptors(); 696#endif 697 698 // Some Mac-specific interceptors. 699#if defined(__APPLE__) 700 InitializeMacInterceptors(); 701#endif 702 703 if (flags()->verbosity > 0) { 704 Report("AddressSanitizer: libc interceptors initialized\n"); 705 } 706} 707 708} // namespace __asan 709