asan_interceptors.cc revision d530d892b4958a9ae54e57472d5d0a0bae1f6ad8
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_poisoning.h" 21#include "asan_report.h" 22#include "asan_stack.h" 23#include "asan_stats.h" 24#include "interception/interception.h" 25#include "sanitizer_common/sanitizer_libc.h" 26 27namespace __asan { 28 29// Return true if we can quickly decide that the region is unpoisoned. 30static inline bool QuickCheckForUnpoisonedRegion(uptr beg, uptr size) { 31 if (size == 0) return true; 32 if (size <= 32) 33 return !AddressIsPoisoned(beg) && 34 !AddressIsPoisoned(beg + size - 1) && 35 !AddressIsPoisoned(beg + size / 2); 36 return false; 37} 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// We check all shadow bytes. 44#define ACCESS_MEMORY_RANGE(offset, size, isWrite) do { \ 45 uptr __offset = (uptr)(offset); \ 46 uptr __size = (uptr)(size); \ 47 uptr __bad = 0; \ 48 if (!QuickCheckForUnpoisonedRegion(__offset, __size) && \ 49 (__bad = __asan_region_is_poisoned(__offset, __size))) { \ 50 GET_CURRENT_PC_BP_SP; \ 51 __asan_report_error(pc, bp, sp, __bad, isWrite, __size); \ 52 } \ 53 } while (0) 54 55#define ASAN_READ_RANGE(offset, size) ACCESS_MEMORY_RANGE(offset, size, false) 56#define ASAN_WRITE_RANGE(offset, size) ACCESS_MEMORY_RANGE(offset, size, true); 57 58// Behavior of functions like "memcpy" or "strcpy" is undefined 59// if memory intervals overlap. We report error in this case. 60// Macro is used to avoid creation of new frames. 61static inline bool RangesOverlap(const char *offset1, uptr length1, 62 const char *offset2, uptr length2) { 63 return !((offset1 + length1 <= offset2) || (offset2 + length2 <= offset1)); 64} 65#define CHECK_RANGES_OVERLAP(name, _offset1, length1, _offset2, length2) do { \ 66 const char *offset1 = (const char*)_offset1; \ 67 const char *offset2 = (const char*)_offset2; \ 68 if (RangesOverlap(offset1, length1, offset2, length2)) { \ 69 GET_STACK_TRACE_FATAL_HERE; \ 70 ReportStringFunctionMemoryRangesOverlap(name, offset1, length1, \ 71 offset2, length2, &stack); \ 72 } \ 73} while (0) 74 75#define ENSURE_ASAN_INITED() do { \ 76 CHECK(!asan_init_is_running); \ 77 if (!asan_inited) { \ 78 __asan_init(); \ 79 } \ 80} while (0) 81 82static inline uptr MaybeRealStrnlen(const char *s, uptr maxlen) { 83#if ASAN_INTERCEPT_STRNLEN 84 if (REAL(strnlen) != 0) { 85 return REAL(strnlen)(s, maxlen); 86 } 87#endif 88 return internal_strnlen(s, maxlen); 89} 90 91void SetThreadName(const char *name) { 92 AsanThread *t = GetCurrentThread(); 93 if (t) 94 asanThreadRegistry().SetThreadName(t->tid(), name); 95} 96 97static void DisableStrictInitOrderChecker() { 98 if (flags()->strict_init_order) 99 flags()->check_initialization_order = false; 100} 101 102} // namespace __asan 103 104// ---------------------- Wrappers ---------------- {{{1 105using namespace __asan; // NOLINT 106 107#define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \ 108 ASAN_WRITE_RANGE(ptr, size) 109#define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) ASAN_READ_RANGE(ptr, size) 110#define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \ 111 do { \ 112 if (asan_init_is_running) return REAL(func)(__VA_ARGS__); \ 113 ctx = 0; \ 114 (void) ctx; \ 115 ENSURE_ASAN_INITED(); \ 116 } while (false) 117#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \ 118 do { \ 119 } while (false) 120#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \ 121 do { \ 122 } while (false) 123#define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \ 124 do { \ 125 } while (false) 126#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) SetThreadName(name) 127#include "sanitizer_common/sanitizer_common_interceptors.inc" 128 129#define COMMON_SYSCALL_PRE_READ_RANGE(p, s) ASAN_READ_RANGE(p, s) 130#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) ASAN_WRITE_RANGE(p, s) 131#define COMMON_SYSCALL_POST_READ_RANGE(p, s) 132#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) 133#include "sanitizer_common/sanitizer_common_syscalls.inc" 134 135static thread_return_t THREAD_CALLING_CONV asan_thread_start(void *arg) { 136 AsanThread *t = (AsanThread*)arg; 137 SetCurrentThread(t); 138 return t->ThreadStart(GetTid()); 139} 140 141#if ASAN_INTERCEPT_PTHREAD_CREATE 142extern "C" int pthread_attr_getdetachstate(void *attr, int *v); 143 144INTERCEPTOR(int, pthread_create, void *thread, 145 void *attr, void *(*start_routine)(void*), void *arg) { 146 // Strict init-order checking in thread-hostile. 147 DisableStrictInitOrderChecker(); 148 GET_STACK_TRACE_THREAD; 149 int detached = 0; 150 if (attr != 0) 151 pthread_attr_getdetachstate(attr, &detached); 152 153 u32 current_tid = GetCurrentTidOrInvalid(); 154 AsanThread *t = AsanThread::Create(start_routine, arg); 155 CreateThreadContextArgs args = { t, &stack }; 156 asanThreadRegistry().CreateThread(*(uptr*)t, detached, current_tid, &args); 157 return REAL(pthread_create)(thread, attr, asan_thread_start, t); 158} 159#endif // ASAN_INTERCEPT_PTHREAD_CREATE 160 161#if ASAN_INTERCEPT_SIGNAL_AND_SIGACTION 162INTERCEPTOR(void*, signal, int signum, void *handler) { 163 if (!AsanInterceptsSignal(signum) || flags()->allow_user_segv_handler) { 164 return REAL(signal)(signum, handler); 165 } 166 return 0; 167} 168 169INTERCEPTOR(int, sigaction, int signum, const struct sigaction *act, 170 struct sigaction *oldact) { 171 if (!AsanInterceptsSignal(signum) || flags()->allow_user_segv_handler) { 172 return REAL(sigaction)(signum, act, oldact); 173 } 174 return 0; 175} 176#elif SANITIZER_POSIX 177// We need to have defined REAL(sigaction) on posix systems. 178DEFINE_REAL(int, sigaction, int signum, const struct sigaction *act, 179 struct sigaction *oldact) 180#endif // ASAN_INTERCEPT_SIGNAL_AND_SIGACTION 181 182#if ASAN_INTERCEPT_SWAPCONTEXT 183static void ClearShadowMemoryForContextStack(uptr stack, uptr ssize) { 184 // Align to page size. 185 uptr PageSize = GetPageSizeCached(); 186 uptr bottom = stack & ~(PageSize - 1); 187 ssize += stack - bottom; 188 ssize = RoundUpTo(ssize, PageSize); 189 static const uptr kMaxSaneContextStackSize = 1 << 22; // 4 Mb 190 if (ssize && ssize <= kMaxSaneContextStackSize) { 191 PoisonShadow(bottom, ssize, 0); 192 } 193} 194 195INTERCEPTOR(int, swapcontext, struct ucontext_t *oucp, 196 struct ucontext_t *ucp) { 197 static bool reported_warning = false; 198 if (!reported_warning) { 199 Report("WARNING: ASan doesn't fully support makecontext/swapcontext " 200 "functions and may produce false positives in some cases!\n"); 201 reported_warning = true; 202 } 203 // Clear shadow memory for new context (it may share stack 204 // with current context). 205 uptr stack, ssize; 206 ReadContextStack(ucp, &stack, &ssize); 207 ClearShadowMemoryForContextStack(stack, ssize); 208 int res = REAL(swapcontext)(oucp, ucp); 209 // swapcontext technically does not return, but program may swap context to 210 // "oucp" later, that would look as if swapcontext() returned 0. 211 // We need to clear shadow for ucp once again, as it may be in arbitrary 212 // state. 213 ClearShadowMemoryForContextStack(stack, ssize); 214 return res; 215} 216#endif // ASAN_INTERCEPT_SWAPCONTEXT 217 218INTERCEPTOR(void, longjmp, void *env, int val) { 219 __asan_handle_no_return(); 220 REAL(longjmp)(env, val); 221} 222 223#if ASAN_INTERCEPT__LONGJMP 224INTERCEPTOR(void, _longjmp, void *env, int val) { 225 __asan_handle_no_return(); 226 REAL(_longjmp)(env, val); 227} 228#endif 229 230#if ASAN_INTERCEPT_SIGLONGJMP 231INTERCEPTOR(void, siglongjmp, void *env, int val) { 232 __asan_handle_no_return(); 233 REAL(siglongjmp)(env, val); 234} 235#endif 236 237#if ASAN_INTERCEPT___CXA_THROW 238INTERCEPTOR(void, __cxa_throw, void *a, void *b, void *c) { 239 CHECK(REAL(__cxa_throw)); 240 __asan_handle_no_return(); 241 REAL(__cxa_throw)(a, b, c); 242} 243#endif 244 245// intercept mlock and friends. 246// Since asan maps 16T of RAM, mlock is completely unfriendly to asan. 247// All functions return 0 (success). 248static void MlockIsUnsupported() { 249 static bool printed = false; 250 if (printed) return; 251 printed = true; 252 Printf("INFO: AddressSanitizer ignores mlock/mlockall/munlock/munlockall\n"); 253} 254 255INTERCEPTOR(int, mlock, const void *addr, uptr len) { 256 MlockIsUnsupported(); 257 return 0; 258} 259 260INTERCEPTOR(int, munlock, const void *addr, uptr len) { 261 MlockIsUnsupported(); 262 return 0; 263} 264 265INTERCEPTOR(int, mlockall, int flags) { 266 MlockIsUnsupported(); 267 return 0; 268} 269 270INTERCEPTOR(int, munlockall, void) { 271 MlockIsUnsupported(); 272 return 0; 273} 274 275static inline int CharCmp(unsigned char c1, unsigned char c2) { 276 return (c1 == c2) ? 0 : (c1 < c2) ? -1 : 1; 277} 278 279INTERCEPTOR(int, memcmp, const void *a1, const void *a2, uptr size) { 280 if (!asan_inited) return internal_memcmp(a1, a2, size); 281 ENSURE_ASAN_INITED(); 282 if (flags()->replace_intrin) { 283 if (flags()->strict_memcmp) { 284 // Check the entire regions even if the first bytes of the buffers are 285 // different. 286 ASAN_READ_RANGE(a1, size); 287 ASAN_READ_RANGE(a2, size); 288 // Fallthrough to REAL(memcmp) below. 289 } else { 290 unsigned char c1 = 0, c2 = 0; 291 const unsigned char *s1 = (const unsigned char*)a1; 292 const unsigned char *s2 = (const unsigned char*)a2; 293 uptr i; 294 for (i = 0; i < size; i++) { 295 c1 = s1[i]; 296 c2 = s2[i]; 297 if (c1 != c2) break; 298 } 299 ASAN_READ_RANGE(s1, Min(i + 1, size)); 300 ASAN_READ_RANGE(s2, Min(i + 1, size)); 301 return CharCmp(c1, c2); 302 } 303 } 304 return REAL(memcmp(a1, a2, size)); 305} 306 307INTERCEPTOR(void*, memcpy, void *to, const void *from, uptr size) { 308 if (!asan_inited) return internal_memcpy(to, from, size); 309 // memcpy is called during __asan_init() from the internals 310 // of printf(...). 311 if (asan_init_is_running) { 312 return REAL(memcpy)(to, from, size); 313 } 314 ENSURE_ASAN_INITED(); 315 if (flags()->replace_intrin) { 316 if (to != from) { 317 // We do not treat memcpy with to==from as a bug. 318 // See http://llvm.org/bugs/show_bug.cgi?id=11763. 319 CHECK_RANGES_OVERLAP("memcpy", to, size, from, size); 320 } 321 ASAN_READ_RANGE(from, size); 322 ASAN_WRITE_RANGE(to, size); 323 } 324 // Interposing of resolver functions is broken on Mac OS 10.7 and 10.8. 325 // See also http://code.google.com/p/address-sanitizer/issues/detail?id=116. 326 return internal_memcpy(to, from, size); 327} 328 329INTERCEPTOR(void*, memmove, void *to, const void *from, uptr size) { 330 if (!asan_inited) return internal_memmove(to, from, size); 331 if (asan_init_is_running) { 332 return REAL(memmove)(to, from, size); 333 } 334 ENSURE_ASAN_INITED(); 335 if (flags()->replace_intrin) { 336 ASAN_READ_RANGE(from, size); 337 ASAN_WRITE_RANGE(to, size); 338 } 339 // Interposing of resolver functions is broken on Mac OS 10.7 and 10.8. 340 // See also http://code.google.com/p/address-sanitizer/issues/detail?id=116. 341 return internal_memmove(to, from, size); 342} 343 344INTERCEPTOR(void*, memset, void *block, int c, uptr size) { 345 if (!asan_inited) return internal_memset(block, c, size); 346 // memset is called inside Printf. 347 if (asan_init_is_running) { 348 return REAL(memset)(block, c, size); 349 } 350 ENSURE_ASAN_INITED(); 351 if (flags()->replace_intrin) { 352 ASAN_WRITE_RANGE(block, size); 353 } 354 return REAL(memset)(block, c, size); 355} 356 357INTERCEPTOR(char*, strchr, const char *str, int c) { 358 if (!asan_inited) return internal_strchr(str, c); 359 // strchr is called inside create_purgeable_zone() when MallocGuardEdges=1 is 360 // used. 361 if (asan_init_is_running) { 362 return REAL(strchr)(str, c); 363 } 364 ENSURE_ASAN_INITED(); 365 char *result = REAL(strchr)(str, c); 366 if (flags()->replace_str) { 367 uptr bytes_read = (result ? result - str : REAL(strlen)(str)) + 1; 368 ASAN_READ_RANGE(str, bytes_read); 369 } 370 return result; 371} 372 373#if ASAN_INTERCEPT_INDEX 374# if ASAN_USE_ALIAS_ATTRIBUTE_FOR_INDEX 375INTERCEPTOR(char*, index, const char *string, int c) 376 ALIAS(WRAPPER_NAME(strchr)); 377# else 378# if SANITIZER_MAC 379DECLARE_REAL(char*, index, const char *string, int c) 380OVERRIDE_FUNCTION(index, strchr); 381# else 382DEFINE_REAL(char*, index, const char *string, int c) 383# endif 384# endif 385#endif // ASAN_INTERCEPT_INDEX 386 387// For both strcat() and strncat() we need to check the validity of |to| 388// argument irrespective of the |from| length. 389INTERCEPTOR(char*, strcat, char *to, const char *from) { // NOLINT 390 ENSURE_ASAN_INITED(); 391 if (flags()->replace_str) { 392 uptr from_length = REAL(strlen)(from); 393 ASAN_READ_RANGE(from, from_length + 1); 394 uptr to_length = REAL(strlen)(to); 395 ASAN_READ_RANGE(to, to_length); 396 ASAN_WRITE_RANGE(to + to_length, from_length + 1); 397 // If the copying actually happens, the |from| string should not overlap 398 // with the resulting string starting at |to|, which has a length of 399 // to_length + from_length + 1. 400 if (from_length > 0) { 401 CHECK_RANGES_OVERLAP("strcat", to, from_length + to_length + 1, 402 from, from_length + 1); 403 } 404 } 405 return REAL(strcat)(to, from); // NOLINT 406} 407 408INTERCEPTOR(char*, strncat, char *to, const char *from, uptr size) { 409 ENSURE_ASAN_INITED(); 410 if (flags()->replace_str) { 411 uptr from_length = MaybeRealStrnlen(from, size); 412 uptr copy_length = Min(size, from_length + 1); 413 ASAN_READ_RANGE(from, copy_length); 414 uptr to_length = REAL(strlen)(to); 415 ASAN_READ_RANGE(to, to_length); 416 ASAN_WRITE_RANGE(to + to_length, from_length + 1); 417 if (from_length > 0) { 418 CHECK_RANGES_OVERLAP("strncat", to, to_length + copy_length + 1, 419 from, copy_length); 420 } 421 } 422 return REAL(strncat)(to, from, size); 423} 424 425INTERCEPTOR(int, strcmp, const char *s1, const char *s2) { 426 if (!asan_inited) return internal_strcmp(s1, s2); 427 if (asan_init_is_running) { 428 return REAL(strcmp)(s1, s2); 429 } 430 ENSURE_ASAN_INITED(); 431 unsigned char c1, c2; 432 uptr i; 433 for (i = 0; ; i++) { 434 c1 = (unsigned char)s1[i]; 435 c2 = (unsigned char)s2[i]; 436 if (c1 != c2 || c1 == '\0') break; 437 } 438 ASAN_READ_RANGE(s1, i + 1); 439 ASAN_READ_RANGE(s2, i + 1); 440 return CharCmp(c1, c2); 441} 442 443INTERCEPTOR(char*, strcpy, char *to, const char *from) { // NOLINT 444#if SANITIZER_MAC 445 if (!asan_inited) return REAL(strcpy)(to, from); // NOLINT 446#endif 447 // strcpy is called from malloc_default_purgeable_zone() 448 // in __asan::ReplaceSystemAlloc() on Mac. 449 if (asan_init_is_running) { 450 return REAL(strcpy)(to, from); // NOLINT 451 } 452 ENSURE_ASAN_INITED(); 453 if (flags()->replace_str) { 454 uptr from_size = REAL(strlen)(from) + 1; 455 CHECK_RANGES_OVERLAP("strcpy", to, from_size, from, from_size); 456 ASAN_READ_RANGE(from, from_size); 457 ASAN_WRITE_RANGE(to, from_size); 458 } 459 return REAL(strcpy)(to, from); // NOLINT 460} 461 462#if ASAN_INTERCEPT_STRDUP 463INTERCEPTOR(char*, strdup, const char *s) { 464 if (!asan_inited) return internal_strdup(s); 465 ENSURE_ASAN_INITED(); 466 uptr length = REAL(strlen)(s); 467 if (flags()->replace_str) { 468 ASAN_READ_RANGE(s, length + 1); 469 } 470 GET_STACK_TRACE_MALLOC; 471 void *new_mem = asan_malloc(length + 1, &stack); 472 REAL(memcpy)(new_mem, s, length + 1); 473 return reinterpret_cast<char*>(new_mem); 474} 475#endif 476 477INTERCEPTOR(uptr, strlen, const char *s) { 478 if (!asan_inited) return internal_strlen(s); 479 // strlen is called from malloc_default_purgeable_zone() 480 // in __asan::ReplaceSystemAlloc() on Mac. 481 if (asan_init_is_running) { 482 return REAL(strlen)(s); 483 } 484 ENSURE_ASAN_INITED(); 485 uptr length = REAL(strlen)(s); 486 if (flags()->replace_str) { 487 ASAN_READ_RANGE(s, length + 1); 488 } 489 return length; 490} 491 492INTERCEPTOR(int, strncmp, const char *s1, const char *s2, uptr size) { 493 if (!asan_inited) return internal_strncmp(s1, s2, size); 494 // strncmp is called from malloc_default_purgeable_zone() 495 // in __asan::ReplaceSystemAlloc() on Mac. 496 if (asan_init_is_running) { 497 return REAL(strncmp)(s1, s2, size); 498 } 499 ENSURE_ASAN_INITED(); 500 unsigned char c1 = 0, c2 = 0; 501 uptr i; 502 for (i = 0; i < size; i++) { 503 c1 = (unsigned char)s1[i]; 504 c2 = (unsigned char)s2[i]; 505 if (c1 != c2 || c1 == '\0') break; 506 } 507 ASAN_READ_RANGE(s1, Min(i + 1, size)); 508 ASAN_READ_RANGE(s2, Min(i + 1, size)); 509 return CharCmp(c1, c2); 510} 511 512INTERCEPTOR(char*, strncpy, char *to, const char *from, uptr size) { 513 ENSURE_ASAN_INITED(); 514 if (flags()->replace_str) { 515 uptr from_size = Min(size, MaybeRealStrnlen(from, size) + 1); 516 CHECK_RANGES_OVERLAP("strncpy", to, from_size, from, from_size); 517 ASAN_READ_RANGE(from, from_size); 518 ASAN_WRITE_RANGE(to, size); 519 } 520 return REAL(strncpy)(to, from, size); 521} 522 523#if ASAN_INTERCEPT_STRNLEN 524INTERCEPTOR(uptr, strnlen, const char *s, uptr maxlen) { 525 ENSURE_ASAN_INITED(); 526 uptr length = REAL(strnlen)(s, maxlen); 527 if (flags()->replace_str) { 528 ASAN_READ_RANGE(s, Min(length + 1, maxlen)); 529 } 530 return length; 531} 532#endif // ASAN_INTERCEPT_STRNLEN 533 534static inline bool IsValidStrtolBase(int base) { 535 return (base == 0) || (2 <= base && base <= 36); 536} 537 538static inline void FixRealStrtolEndptr(const char *nptr, char **endptr) { 539 CHECK(endptr); 540 if (nptr == *endptr) { 541 // No digits were found at strtol call, we need to find out the last 542 // symbol accessed by strtoll on our own. 543 // We get this symbol by skipping leading blanks and optional +/- sign. 544 while (IsSpace(*nptr)) nptr++; 545 if (*nptr == '+' || *nptr == '-') nptr++; 546 *endptr = (char*)nptr; 547 } 548 CHECK(*endptr >= nptr); 549} 550 551INTERCEPTOR(long, strtol, const char *nptr, // NOLINT 552 char **endptr, int base) { 553 ENSURE_ASAN_INITED(); 554 if (!flags()->replace_str) { 555 return REAL(strtol)(nptr, endptr, base); 556 } 557 char *real_endptr; 558 long result = REAL(strtol)(nptr, &real_endptr, base); // NOLINT 559 if (endptr != 0) { 560 *endptr = real_endptr; 561 } 562 if (IsValidStrtolBase(base)) { 563 FixRealStrtolEndptr(nptr, &real_endptr); 564 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 565 } 566 return result; 567} 568 569INTERCEPTOR(int, atoi, const char *nptr) { 570#if SANITIZER_MAC 571 if (!asan_inited) return REAL(atoi)(nptr); 572#endif 573 ENSURE_ASAN_INITED(); 574 if (!flags()->replace_str) { 575 return REAL(atoi)(nptr); 576 } 577 char *real_endptr; 578 // "man atoi" tells that behavior of atoi(nptr) is the same as 579 // strtol(nptr, 0, 10), i.e. it sets errno to ERANGE if the 580 // parsed integer can't be stored in *long* type (even if it's 581 // different from int). So, we just imitate this behavior. 582 int result = REAL(strtol)(nptr, &real_endptr, 10); 583 FixRealStrtolEndptr(nptr, &real_endptr); 584 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 585 return result; 586} 587 588INTERCEPTOR(long, atol, const char *nptr) { // NOLINT 589#if SANITIZER_MAC 590 if (!asan_inited) return REAL(atol)(nptr); 591#endif 592 ENSURE_ASAN_INITED(); 593 if (!flags()->replace_str) { 594 return REAL(atol)(nptr); 595 } 596 char *real_endptr; 597 long result = REAL(strtol)(nptr, &real_endptr, 10); // NOLINT 598 FixRealStrtolEndptr(nptr, &real_endptr); 599 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 600 return result; 601} 602 603#if ASAN_INTERCEPT_ATOLL_AND_STRTOLL 604INTERCEPTOR(long long, strtoll, const char *nptr, // NOLINT 605 char **endptr, int base) { 606 ENSURE_ASAN_INITED(); 607 if (!flags()->replace_str) { 608 return REAL(strtoll)(nptr, endptr, base); 609 } 610 char *real_endptr; 611 long long result = REAL(strtoll)(nptr, &real_endptr, base); // NOLINT 612 if (endptr != 0) { 613 *endptr = real_endptr; 614 } 615 // If base has unsupported value, strtoll can exit with EINVAL 616 // without reading any characters. So do additional checks only 617 // if base is valid. 618 if (IsValidStrtolBase(base)) { 619 FixRealStrtolEndptr(nptr, &real_endptr); 620 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 621 } 622 return result; 623} 624 625INTERCEPTOR(long long, atoll, const char *nptr) { // NOLINT 626 ENSURE_ASAN_INITED(); 627 if (!flags()->replace_str) { 628 return REAL(atoll)(nptr); 629 } 630 char *real_endptr; 631 long long result = REAL(strtoll)(nptr, &real_endptr, 10); // NOLINT 632 FixRealStrtolEndptr(nptr, &real_endptr); 633 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 634 return result; 635} 636#endif // ASAN_INTERCEPT_ATOLL_AND_STRTOLL 637 638static void AtCxaAtexit(void *unused) { 639 (void)unused; 640 StopInitOrderChecking(); 641} 642 643#if ASAN_INTERCEPT___CXA_ATEXIT 644INTERCEPTOR(int, __cxa_atexit, void (*func)(void *), void *arg, 645 void *dso_handle) { 646 ENSURE_ASAN_INITED(); 647 int res = REAL(__cxa_atexit)(func, arg, dso_handle); 648 REAL(__cxa_atexit)(AtCxaAtexit, 0, 0); 649 return res; 650} 651#endif // ASAN_INTERCEPT___CXA_ATEXIT 652 653#if !SANITIZER_MAC 654#define ASAN_INTERCEPT_FUNC(name) do { \ 655 if (!INTERCEPT_FUNCTION(name) && flags()->verbosity > 0) \ 656 Report("AddressSanitizer: failed to intercept '" #name "'\n"); \ 657 } while (0) 658#else 659// OS X interceptors don't need to be initialized with INTERCEPT_FUNCTION. 660#define ASAN_INTERCEPT_FUNC(name) 661#endif // SANITIZER_MAC 662 663#if SANITIZER_WINDOWS 664INTERCEPTOR_WINAPI(DWORD, CreateThread, 665 void* security, uptr stack_size, 666 DWORD (__stdcall *start_routine)(void*), void* arg, 667 DWORD flags, void* tid) { 668 // Strict init-order checking in thread-hostile. 669 DisableStrictInitOrderChecker(); 670 GET_STACK_TRACE_THREAD; 671 u32 current_tid = GetCurrentTidOrInvalid(); 672 AsanThread *t = AsanThread::Create(start_routine, arg); 673 CreateThreadContextArgs args = { t, &stack }; 674 bool detached = false; // FIXME: how can we determine it on Windows? 675 asanThreadRegistry().CreateThread(*(uptr*)t, detached, current_tid, &args); 676 return REAL(CreateThread)(security, stack_size, 677 asan_thread_start, t, flags, tid); 678} 679 680namespace __asan { 681void InitializeWindowsInterceptors() { 682 ASAN_INTERCEPT_FUNC(CreateThread); 683} 684 685} // namespace __asan 686#endif 687 688// ---------------------- InitializeAsanInterceptors ---------------- {{{1 689namespace __asan { 690void InitializeAsanInterceptors() { 691 static bool was_called_once; 692 CHECK(was_called_once == false); 693 was_called_once = true; 694 SANITIZER_COMMON_INTERCEPTORS_INIT; 695 696 // Intercept mem* functions. 697 ASAN_INTERCEPT_FUNC(memcmp); 698 ASAN_INTERCEPT_FUNC(memmove); 699 ASAN_INTERCEPT_FUNC(memset); 700 if (PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE) { 701 ASAN_INTERCEPT_FUNC(memcpy); 702 } 703 704 // Intercept str* functions. 705 ASAN_INTERCEPT_FUNC(strcat); // NOLINT 706 ASAN_INTERCEPT_FUNC(strchr); 707 ASAN_INTERCEPT_FUNC(strcmp); 708 ASAN_INTERCEPT_FUNC(strcpy); // NOLINT 709 ASAN_INTERCEPT_FUNC(strlen); 710 ASAN_INTERCEPT_FUNC(strncat); 711 ASAN_INTERCEPT_FUNC(strncmp); 712 ASAN_INTERCEPT_FUNC(strncpy); 713#if ASAN_INTERCEPT_STRDUP 714 ASAN_INTERCEPT_FUNC(strdup); 715#endif 716#if ASAN_INTERCEPT_STRNLEN 717 ASAN_INTERCEPT_FUNC(strnlen); 718#endif 719#if ASAN_INTERCEPT_INDEX && ASAN_USE_ALIAS_ATTRIBUTE_FOR_INDEX 720 ASAN_INTERCEPT_FUNC(index); 721#endif 722 723 ASAN_INTERCEPT_FUNC(atoi); 724 ASAN_INTERCEPT_FUNC(atol); 725 ASAN_INTERCEPT_FUNC(strtol); 726#if ASAN_INTERCEPT_ATOLL_AND_STRTOLL 727 ASAN_INTERCEPT_FUNC(atoll); 728 ASAN_INTERCEPT_FUNC(strtoll); 729#endif 730 731#if ASAN_INTERCEPT_MLOCKX 732 // Intercept mlock/munlock. 733 ASAN_INTERCEPT_FUNC(mlock); 734 ASAN_INTERCEPT_FUNC(munlock); 735 ASAN_INTERCEPT_FUNC(mlockall); 736 ASAN_INTERCEPT_FUNC(munlockall); 737#endif 738 739 // Intecept signal- and jump-related functions. 740 ASAN_INTERCEPT_FUNC(longjmp); 741#if ASAN_INTERCEPT_SIGNAL_AND_SIGACTION 742 ASAN_INTERCEPT_FUNC(sigaction); 743 ASAN_INTERCEPT_FUNC(signal); 744#endif 745#if ASAN_INTERCEPT_SWAPCONTEXT 746 ASAN_INTERCEPT_FUNC(swapcontext); 747#endif 748#if ASAN_INTERCEPT__LONGJMP 749 ASAN_INTERCEPT_FUNC(_longjmp); 750#endif 751#if ASAN_INTERCEPT_SIGLONGJMP 752 ASAN_INTERCEPT_FUNC(siglongjmp); 753#endif 754 755 // Intercept exception handling functions. 756#if ASAN_INTERCEPT___CXA_THROW 757 INTERCEPT_FUNCTION(__cxa_throw); 758#endif 759 760 // Intercept threading-related functions 761#if ASAN_INTERCEPT_PTHREAD_CREATE 762 ASAN_INTERCEPT_FUNC(pthread_create); 763#endif 764 765 // Intercept atexit function. 766#if ASAN_INTERCEPT___CXA_ATEXIT 767 ASAN_INTERCEPT_FUNC(__cxa_atexit); 768#endif 769 770 // Some Windows-specific interceptors. 771#if SANITIZER_WINDOWS 772 InitializeWindowsInterceptors(); 773#endif 774 775 if (flags()->verbosity > 0) { 776 Report("AddressSanitizer: libc interceptors initialized\n"); 777 } 778} 779 780} // namespace __asan 781