asan_interceptors.cc revision c8c312adee610a1f9284f567a35562f6f8dc15e0
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 if (flags()->verbosity > 0) 253 Printf("INFO: AddressSanitizer ignores mlock/mlockall/munlock/munlockall\n"); 254} 255 256INTERCEPTOR(int, mlock, const void *addr, uptr len) { 257 MlockIsUnsupported(); 258 return 0; 259} 260 261INTERCEPTOR(int, munlock, const void *addr, uptr len) { 262 MlockIsUnsupported(); 263 return 0; 264} 265 266INTERCEPTOR(int, mlockall, int flags) { 267 MlockIsUnsupported(); 268 return 0; 269} 270 271INTERCEPTOR(int, munlockall, void) { 272 MlockIsUnsupported(); 273 return 0; 274} 275 276static inline int CharCmp(unsigned char c1, unsigned char c2) { 277 return (c1 == c2) ? 0 : (c1 < c2) ? -1 : 1; 278} 279 280INTERCEPTOR(int, memcmp, const void *a1, const void *a2, uptr size) { 281 if (!asan_inited) return internal_memcmp(a1, a2, size); 282 ENSURE_ASAN_INITED(); 283 if (flags()->replace_intrin) { 284 if (flags()->strict_memcmp) { 285 // Check the entire regions even if the first bytes of the buffers are 286 // different. 287 ASAN_READ_RANGE(a1, size); 288 ASAN_READ_RANGE(a2, size); 289 // Fallthrough to REAL(memcmp) below. 290 } else { 291 unsigned char c1 = 0, c2 = 0; 292 const unsigned char *s1 = (const unsigned char*)a1; 293 const unsigned char *s2 = (const unsigned char*)a2; 294 uptr i; 295 for (i = 0; i < size; i++) { 296 c1 = s1[i]; 297 c2 = s2[i]; 298 if (c1 != c2) break; 299 } 300 ASAN_READ_RANGE(s1, Min(i + 1, size)); 301 ASAN_READ_RANGE(s2, Min(i + 1, size)); 302 return CharCmp(c1, c2); 303 } 304 } 305 return REAL(memcmp(a1, a2, size)); 306} 307 308INTERCEPTOR(void*, memcpy, void *to, const void *from, uptr size) { 309 if (!asan_inited) return internal_memcpy(to, from, size); 310 // memcpy is called during __asan_init() from the internals 311 // of printf(...). 312 if (asan_init_is_running) { 313 return REAL(memcpy)(to, from, size); 314 } 315 ENSURE_ASAN_INITED(); 316 if (flags()->replace_intrin) { 317 if (to != from) { 318 // We do not treat memcpy with to==from as a bug. 319 // See http://llvm.org/bugs/show_bug.cgi?id=11763. 320 CHECK_RANGES_OVERLAP("memcpy", to, size, from, size); 321 } 322 ASAN_READ_RANGE(from, size); 323 ASAN_WRITE_RANGE(to, size); 324 } 325 // Interposing of resolver functions is broken on Mac OS 10.7 and 10.8. 326 // See also http://code.google.com/p/address-sanitizer/issues/detail?id=116. 327 return internal_memcpy(to, from, size); 328} 329 330INTERCEPTOR(void*, memmove, void *to, const void *from, uptr size) { 331 if (!asan_inited) return internal_memmove(to, from, size); 332 if (asan_init_is_running) { 333 return REAL(memmove)(to, from, size); 334 } 335 ENSURE_ASAN_INITED(); 336 if (flags()->replace_intrin) { 337 ASAN_READ_RANGE(from, size); 338 ASAN_WRITE_RANGE(to, size); 339 } 340 // Interposing of resolver functions is broken on Mac OS 10.7 and 10.8. 341 // See also http://code.google.com/p/address-sanitizer/issues/detail?id=116. 342 return internal_memmove(to, from, size); 343} 344 345INTERCEPTOR(void*, memset, void *block, int c, uptr size) { 346 if (!asan_inited) return internal_memset(block, c, size); 347 // memset is called inside Printf. 348 if (asan_init_is_running) { 349 return REAL(memset)(block, c, size); 350 } 351 ENSURE_ASAN_INITED(); 352 if (flags()->replace_intrin) { 353 ASAN_WRITE_RANGE(block, size); 354 } 355 return REAL(memset)(block, c, size); 356} 357 358INTERCEPTOR(char*, strchr, const char *str, int c) { 359 if (!asan_inited) return internal_strchr(str, c); 360 // strchr is called inside create_purgeable_zone() when MallocGuardEdges=1 is 361 // used. 362 if (asan_init_is_running) { 363 return REAL(strchr)(str, c); 364 } 365 ENSURE_ASAN_INITED(); 366 char *result = REAL(strchr)(str, c); 367 if (flags()->replace_str) { 368 uptr bytes_read = (result ? result - str : REAL(strlen)(str)) + 1; 369 ASAN_READ_RANGE(str, bytes_read); 370 } 371 return result; 372} 373 374#if ASAN_INTERCEPT_INDEX 375# if ASAN_USE_ALIAS_ATTRIBUTE_FOR_INDEX 376INTERCEPTOR(char*, index, const char *string, int c) 377 ALIAS(WRAPPER_NAME(strchr)); 378# else 379# if SANITIZER_MAC 380DECLARE_REAL(char*, index, const char *string, int c) 381OVERRIDE_FUNCTION(index, strchr); 382# else 383DEFINE_REAL(char*, index, const char *string, int c) 384# endif 385# endif 386#endif // ASAN_INTERCEPT_INDEX 387 388// For both strcat() and strncat() we need to check the validity of |to| 389// argument irrespective of the |from| length. 390INTERCEPTOR(char*, strcat, char *to, const char *from) { // NOLINT 391 ENSURE_ASAN_INITED(); 392 if (flags()->replace_str) { 393 uptr from_length = REAL(strlen)(from); 394 ASAN_READ_RANGE(from, from_length + 1); 395 uptr to_length = REAL(strlen)(to); 396 ASAN_READ_RANGE(to, to_length); 397 ASAN_WRITE_RANGE(to + to_length, from_length + 1); 398 // If the copying actually happens, the |from| string should not overlap 399 // with the resulting string starting at |to|, which has a length of 400 // to_length + from_length + 1. 401 if (from_length > 0) { 402 CHECK_RANGES_OVERLAP("strcat", to, from_length + to_length + 1, 403 from, from_length + 1); 404 } 405 } 406 return REAL(strcat)(to, from); // NOLINT 407} 408 409INTERCEPTOR(char*, strncat, char *to, const char *from, uptr size) { 410 ENSURE_ASAN_INITED(); 411 if (flags()->replace_str) { 412 uptr from_length = MaybeRealStrnlen(from, size); 413 uptr copy_length = Min(size, from_length + 1); 414 ASAN_READ_RANGE(from, copy_length); 415 uptr to_length = REAL(strlen)(to); 416 ASAN_READ_RANGE(to, to_length); 417 ASAN_WRITE_RANGE(to + to_length, from_length + 1); 418 if (from_length > 0) { 419 CHECK_RANGES_OVERLAP("strncat", to, to_length + copy_length + 1, 420 from, copy_length); 421 } 422 } 423 return REAL(strncat)(to, from, size); 424} 425 426INTERCEPTOR(int, strcmp, const char *s1, const char *s2) { 427 if (!asan_inited) return internal_strcmp(s1, s2); 428 if (asan_init_is_running) { 429 return REAL(strcmp)(s1, s2); 430 } 431 ENSURE_ASAN_INITED(); 432 unsigned char c1, c2; 433 uptr i; 434 for (i = 0; ; i++) { 435 c1 = (unsigned char)s1[i]; 436 c2 = (unsigned char)s2[i]; 437 if (c1 != c2 || c1 == '\0') break; 438 } 439 ASAN_READ_RANGE(s1, i + 1); 440 ASAN_READ_RANGE(s2, i + 1); 441 return CharCmp(c1, c2); 442} 443 444INTERCEPTOR(char*, strcpy, char *to, const char *from) { // NOLINT 445#if SANITIZER_MAC 446 if (!asan_inited) return REAL(strcpy)(to, from); // NOLINT 447#endif 448 // strcpy is called from malloc_default_purgeable_zone() 449 // in __asan::ReplaceSystemAlloc() on Mac. 450 if (asan_init_is_running) { 451 return REAL(strcpy)(to, from); // NOLINT 452 } 453 ENSURE_ASAN_INITED(); 454 if (flags()->replace_str) { 455 uptr from_size = REAL(strlen)(from) + 1; 456 CHECK_RANGES_OVERLAP("strcpy", to, from_size, from, from_size); 457 ASAN_READ_RANGE(from, from_size); 458 ASAN_WRITE_RANGE(to, from_size); 459 } 460 return REAL(strcpy)(to, from); // NOLINT 461} 462 463#if ASAN_INTERCEPT_STRDUP 464INTERCEPTOR(char*, strdup, const char *s) { 465 if (!asan_inited) return internal_strdup(s); 466 ENSURE_ASAN_INITED(); 467 uptr length = REAL(strlen)(s); 468 if (flags()->replace_str) { 469 ASAN_READ_RANGE(s, length + 1); 470 } 471 GET_STACK_TRACE_MALLOC; 472 void *new_mem = asan_malloc(length + 1, &stack); 473 REAL(memcpy)(new_mem, s, length + 1); 474 return reinterpret_cast<char*>(new_mem); 475} 476#endif 477 478INTERCEPTOR(uptr, strlen, const char *s) { 479 if (!asan_inited) return internal_strlen(s); 480 // strlen is called from malloc_default_purgeable_zone() 481 // in __asan::ReplaceSystemAlloc() on Mac. 482 if (asan_init_is_running) { 483 return REAL(strlen)(s); 484 } 485 ENSURE_ASAN_INITED(); 486 uptr length = REAL(strlen)(s); 487 if (flags()->replace_str) { 488 ASAN_READ_RANGE(s, length + 1); 489 } 490 return length; 491} 492 493INTERCEPTOR(int, strncmp, const char *s1, const char *s2, uptr size) { 494 if (!asan_inited) return internal_strncmp(s1, s2, size); 495 // strncmp is called from malloc_default_purgeable_zone() 496 // in __asan::ReplaceSystemAlloc() on Mac. 497 if (asan_init_is_running) { 498 return REAL(strncmp)(s1, s2, size); 499 } 500 ENSURE_ASAN_INITED(); 501 unsigned char c1 = 0, c2 = 0; 502 uptr i; 503 for (i = 0; i < size; i++) { 504 c1 = (unsigned char)s1[i]; 505 c2 = (unsigned char)s2[i]; 506 if (c1 != c2 || c1 == '\0') break; 507 } 508 ASAN_READ_RANGE(s1, Min(i + 1, size)); 509 ASAN_READ_RANGE(s2, Min(i + 1, size)); 510 return CharCmp(c1, c2); 511} 512 513INTERCEPTOR(char*, strncpy, char *to, const char *from, uptr size) { 514 ENSURE_ASAN_INITED(); 515 if (flags()->replace_str) { 516 uptr from_size = Min(size, MaybeRealStrnlen(from, size) + 1); 517 CHECK_RANGES_OVERLAP("strncpy", to, from_size, from, from_size); 518 ASAN_READ_RANGE(from, from_size); 519 ASAN_WRITE_RANGE(to, size); 520 } 521 return REAL(strncpy)(to, from, size); 522} 523 524#if ASAN_INTERCEPT_STRNLEN 525INTERCEPTOR(uptr, strnlen, const char *s, uptr maxlen) { 526 ENSURE_ASAN_INITED(); 527 uptr length = REAL(strnlen)(s, maxlen); 528 if (flags()->replace_str) { 529 ASAN_READ_RANGE(s, Min(length + 1, maxlen)); 530 } 531 return length; 532} 533#endif // ASAN_INTERCEPT_STRNLEN 534 535static inline bool IsValidStrtolBase(int base) { 536 return (base == 0) || (2 <= base && base <= 36); 537} 538 539static inline void FixRealStrtolEndptr(const char *nptr, char **endptr) { 540 CHECK(endptr); 541 if (nptr == *endptr) { 542 // No digits were found at strtol call, we need to find out the last 543 // symbol accessed by strtoll on our own. 544 // We get this symbol by skipping leading blanks and optional +/- sign. 545 while (IsSpace(*nptr)) nptr++; 546 if (*nptr == '+' || *nptr == '-') nptr++; 547 *endptr = (char*)nptr; 548 } 549 CHECK(*endptr >= nptr); 550} 551 552INTERCEPTOR(long, strtol, const char *nptr, // NOLINT 553 char **endptr, int base) { 554 ENSURE_ASAN_INITED(); 555 if (!flags()->replace_str) { 556 return REAL(strtol)(nptr, endptr, base); 557 } 558 char *real_endptr; 559 long result = REAL(strtol)(nptr, &real_endptr, base); // NOLINT 560 if (endptr != 0) { 561 *endptr = real_endptr; 562 } 563 if (IsValidStrtolBase(base)) { 564 FixRealStrtolEndptr(nptr, &real_endptr); 565 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 566 } 567 return result; 568} 569 570INTERCEPTOR(int, atoi, const char *nptr) { 571#if SANITIZER_MAC 572 if (!asan_inited) return REAL(atoi)(nptr); 573#endif 574 ENSURE_ASAN_INITED(); 575 if (!flags()->replace_str) { 576 return REAL(atoi)(nptr); 577 } 578 char *real_endptr; 579 // "man atoi" tells that behavior of atoi(nptr) is the same as 580 // strtol(nptr, 0, 10), i.e. it sets errno to ERANGE if the 581 // parsed integer can't be stored in *long* type (even if it's 582 // different from int). So, we just imitate this behavior. 583 int result = REAL(strtol)(nptr, &real_endptr, 10); 584 FixRealStrtolEndptr(nptr, &real_endptr); 585 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 586 return result; 587} 588 589INTERCEPTOR(long, atol, const char *nptr) { // NOLINT 590#if SANITIZER_MAC 591 if (!asan_inited) return REAL(atol)(nptr); 592#endif 593 ENSURE_ASAN_INITED(); 594 if (!flags()->replace_str) { 595 return REAL(atol)(nptr); 596 } 597 char *real_endptr; 598 long result = REAL(strtol)(nptr, &real_endptr, 10); // NOLINT 599 FixRealStrtolEndptr(nptr, &real_endptr); 600 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 601 return result; 602} 603 604#if ASAN_INTERCEPT_ATOLL_AND_STRTOLL 605INTERCEPTOR(long long, strtoll, const char *nptr, // NOLINT 606 char **endptr, int base) { 607 ENSURE_ASAN_INITED(); 608 if (!flags()->replace_str) { 609 return REAL(strtoll)(nptr, endptr, base); 610 } 611 char *real_endptr; 612 long long result = REAL(strtoll)(nptr, &real_endptr, base); // NOLINT 613 if (endptr != 0) { 614 *endptr = real_endptr; 615 } 616 // If base has unsupported value, strtoll can exit with EINVAL 617 // without reading any characters. So do additional checks only 618 // if base is valid. 619 if (IsValidStrtolBase(base)) { 620 FixRealStrtolEndptr(nptr, &real_endptr); 621 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 622 } 623 return result; 624} 625 626INTERCEPTOR(long long, atoll, const char *nptr) { // NOLINT 627 ENSURE_ASAN_INITED(); 628 if (!flags()->replace_str) { 629 return REAL(atoll)(nptr); 630 } 631 char *real_endptr; 632 long long result = REAL(strtoll)(nptr, &real_endptr, 10); // NOLINT 633 FixRealStrtolEndptr(nptr, &real_endptr); 634 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 635 return result; 636} 637#endif // ASAN_INTERCEPT_ATOLL_AND_STRTOLL 638 639static void AtCxaAtexit(void *unused) { 640 (void)unused; 641 StopInitOrderChecking(); 642} 643 644#if ASAN_INTERCEPT___CXA_ATEXIT 645INTERCEPTOR(int, __cxa_atexit, void (*func)(void *), void *arg, 646 void *dso_handle) { 647 ENSURE_ASAN_INITED(); 648 int res = REAL(__cxa_atexit)(func, arg, dso_handle); 649 REAL(__cxa_atexit)(AtCxaAtexit, 0, 0); 650 return res; 651} 652#endif // ASAN_INTERCEPT___CXA_ATEXIT 653 654#if !SANITIZER_MAC 655#define ASAN_INTERCEPT_FUNC(name) do { \ 656 if (!INTERCEPT_FUNCTION(name) && flags()->verbosity > 0) \ 657 Report("AddressSanitizer: failed to intercept '" #name "'\n"); \ 658 } while (0) 659#else 660// OS X interceptors don't need to be initialized with INTERCEPT_FUNCTION. 661#define ASAN_INTERCEPT_FUNC(name) 662#endif // SANITIZER_MAC 663 664#if SANITIZER_WINDOWS 665INTERCEPTOR_WINAPI(DWORD, CreateThread, 666 void* security, uptr stack_size, 667 DWORD (__stdcall *start_routine)(void*), void* arg, 668 DWORD flags, void* tid) { 669 // Strict init-order checking in thread-hostile. 670 DisableStrictInitOrderChecker(); 671 GET_STACK_TRACE_THREAD; 672 u32 current_tid = GetCurrentTidOrInvalid(); 673 AsanThread *t = AsanThread::Create(start_routine, arg); 674 CreateThreadContextArgs args = { t, &stack }; 675 bool detached = false; // FIXME: how can we determine it on Windows? 676 asanThreadRegistry().CreateThread(*(uptr*)t, detached, current_tid, &args); 677 return REAL(CreateThread)(security, stack_size, 678 asan_thread_start, t, flags, tid); 679} 680 681namespace __asan { 682void InitializeWindowsInterceptors() { 683 ASAN_INTERCEPT_FUNC(CreateThread); 684} 685 686} // namespace __asan 687#endif 688 689// ---------------------- InitializeAsanInterceptors ---------------- {{{1 690namespace __asan { 691void InitializeAsanInterceptors() { 692 static bool was_called_once; 693 CHECK(was_called_once == false); 694 was_called_once = true; 695 SANITIZER_COMMON_INTERCEPTORS_INIT; 696 697 // Intercept mem* functions. 698 ASAN_INTERCEPT_FUNC(memcmp); 699 ASAN_INTERCEPT_FUNC(memmove); 700 ASAN_INTERCEPT_FUNC(memset); 701 if (PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE) { 702 ASAN_INTERCEPT_FUNC(memcpy); 703 } 704 705 // Intercept str* functions. 706 ASAN_INTERCEPT_FUNC(strcat); // NOLINT 707 ASAN_INTERCEPT_FUNC(strchr); 708 ASAN_INTERCEPT_FUNC(strcmp); 709 ASAN_INTERCEPT_FUNC(strcpy); // NOLINT 710 ASAN_INTERCEPT_FUNC(strlen); 711 ASAN_INTERCEPT_FUNC(strncat); 712 ASAN_INTERCEPT_FUNC(strncmp); 713 ASAN_INTERCEPT_FUNC(strncpy); 714#if ASAN_INTERCEPT_STRDUP 715 ASAN_INTERCEPT_FUNC(strdup); 716#endif 717#if ASAN_INTERCEPT_STRNLEN 718 ASAN_INTERCEPT_FUNC(strnlen); 719#endif 720#if ASAN_INTERCEPT_INDEX && ASAN_USE_ALIAS_ATTRIBUTE_FOR_INDEX 721 ASAN_INTERCEPT_FUNC(index); 722#endif 723 724 ASAN_INTERCEPT_FUNC(atoi); 725 ASAN_INTERCEPT_FUNC(atol); 726 ASAN_INTERCEPT_FUNC(strtol); 727#if ASAN_INTERCEPT_ATOLL_AND_STRTOLL 728 ASAN_INTERCEPT_FUNC(atoll); 729 ASAN_INTERCEPT_FUNC(strtoll); 730#endif 731 732#if ASAN_INTERCEPT_MLOCKX 733 // Intercept mlock/munlock. 734 ASAN_INTERCEPT_FUNC(mlock); 735 ASAN_INTERCEPT_FUNC(munlock); 736 ASAN_INTERCEPT_FUNC(mlockall); 737 ASAN_INTERCEPT_FUNC(munlockall); 738#endif 739 740 // Intecept signal- and jump-related functions. 741 ASAN_INTERCEPT_FUNC(longjmp); 742#if ASAN_INTERCEPT_SIGNAL_AND_SIGACTION 743 ASAN_INTERCEPT_FUNC(sigaction); 744 ASAN_INTERCEPT_FUNC(signal); 745#endif 746#if ASAN_INTERCEPT_SWAPCONTEXT 747 ASAN_INTERCEPT_FUNC(swapcontext); 748#endif 749#if ASAN_INTERCEPT__LONGJMP 750 ASAN_INTERCEPT_FUNC(_longjmp); 751#endif 752#if ASAN_INTERCEPT_SIGLONGJMP 753 ASAN_INTERCEPT_FUNC(siglongjmp); 754#endif 755 756 // Intercept exception handling functions. 757#if ASAN_INTERCEPT___CXA_THROW 758 INTERCEPT_FUNCTION(__cxa_throw); 759#endif 760 761 // Intercept threading-related functions 762#if ASAN_INTERCEPT_PTHREAD_CREATE 763 ASAN_INTERCEPT_FUNC(pthread_create); 764#endif 765 766 // Intercept atexit function. 767#if ASAN_INTERCEPT___CXA_ATEXIT 768 ASAN_INTERCEPT_FUNC(__cxa_atexit); 769#endif 770 771 // Some Windows-specific interceptors. 772#if SANITIZER_WINDOWS 773 InitializeWindowsInterceptors(); 774#endif 775 776 if (flags()->verbosity > 0) { 777 Report("AddressSanitizer: libc interceptors initialized\n"); 778 } 779} 780 781} // namespace __asan 782