asan_interceptors.cc revision eaca82cf249021afa31dbc970278f2f28ea2a1aa
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 97} // namespace __asan 98 99// ---------------------- Wrappers ---------------- {{{1 100using namespace __asan; // NOLINT 101 102DECLARE_REAL_AND_INTERCEPTOR(void *, malloc, uptr) 103DECLARE_REAL_AND_INTERCEPTOR(void, free, void *) 104 105#define COMMON_INTERCEPTOR_UNPOISON_PARAM(ctx, count) \ 106 do { \ 107 } while (false) 108#define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size) \ 109 ASAN_WRITE_RANGE(ptr, size) 110#define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) ASAN_READ_RANGE(ptr, size) 111#define COMMON_INTERCEPTOR_ENTER(ctx, func, ...) \ 112 do { \ 113 if (asan_init_is_running) return REAL(func)(__VA_ARGS__); \ 114 ctx = 0; \ 115 (void) ctx; \ 116 ENSURE_ASAN_INITED(); \ 117 } while (false) 118#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \ 119 do { \ 120 } while (false) 121#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd) \ 122 do { \ 123 } while (false) 124#define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd) \ 125 do { \ 126 } while (false) 127#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) SetThreadName(name) 128#include "sanitizer_common/sanitizer_common_interceptors.inc" 129 130#define COMMON_SYSCALL_PRE_READ_RANGE(p, s) ASAN_READ_RANGE(p, s) 131#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) ASAN_WRITE_RANGE(p, s) 132#define COMMON_SYSCALL_POST_READ_RANGE(p, s) \ 133 do { \ 134 } while (false) 135#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) \ 136 do { \ 137 } while (false) 138#include "sanitizer_common/sanitizer_common_syscalls.inc" 139 140static thread_return_t THREAD_CALLING_CONV asan_thread_start(void *arg) { 141 AsanThread *t = (AsanThread*)arg; 142 SetCurrentThread(t); 143 return t->ThreadStart(GetTid()); 144} 145 146#if ASAN_INTERCEPT_PTHREAD_CREATE 147extern "C" int pthread_attr_getdetachstate(void *attr, int *v); 148 149INTERCEPTOR(int, pthread_create, void *thread, 150 void *attr, void *(*start_routine)(void*), void *arg) { 151 EnsureMainThreadIDIsCorrect(); 152 // Strict init-order checking in thread-hostile. 153 if (flags()->strict_init_order) 154 StopInitOrderChecking(); 155 GET_STACK_TRACE_THREAD; 156 int detached = 0; 157 if (attr != 0) 158 pthread_attr_getdetachstate(attr, &detached); 159 160 u32 current_tid = GetCurrentTidOrInvalid(); 161 AsanThread *t = AsanThread::Create(start_routine, arg); 162 CreateThreadContextArgs args = { t, &stack }; 163 asanThreadRegistry().CreateThread(*(uptr*)t, detached, current_tid, &args); 164 return REAL(pthread_create)(thread, attr, asan_thread_start, t); 165} 166#endif // ASAN_INTERCEPT_PTHREAD_CREATE 167 168#if ASAN_INTERCEPT_SIGNAL_AND_SIGACTION 169INTERCEPTOR(void*, signal, int signum, void *handler) { 170 if (!AsanInterceptsSignal(signum) || flags()->allow_user_segv_handler) { 171 return REAL(signal)(signum, handler); 172 } 173 return 0; 174} 175 176INTERCEPTOR(int, sigaction, int signum, const struct sigaction *act, 177 struct sigaction *oldact) { 178 if (!AsanInterceptsSignal(signum) || flags()->allow_user_segv_handler) { 179 return REAL(sigaction)(signum, act, oldact); 180 } 181 return 0; 182} 183#elif SANITIZER_POSIX 184// We need to have defined REAL(sigaction) on posix systems. 185DEFINE_REAL(int, sigaction, int signum, const struct sigaction *act, 186 struct sigaction *oldact) 187#endif // ASAN_INTERCEPT_SIGNAL_AND_SIGACTION 188 189#if ASAN_INTERCEPT_SWAPCONTEXT 190static void ClearShadowMemoryForContextStack(uptr stack, uptr ssize) { 191 // Align to page size. 192 uptr PageSize = GetPageSizeCached(); 193 uptr bottom = stack & ~(PageSize - 1); 194 ssize += stack - bottom; 195 ssize = RoundUpTo(ssize, PageSize); 196 static const uptr kMaxSaneContextStackSize = 1 << 22; // 4 Mb 197 if (ssize && ssize <= kMaxSaneContextStackSize) { 198 PoisonShadow(bottom, ssize, 0); 199 } 200} 201 202INTERCEPTOR(int, swapcontext, struct ucontext_t *oucp, 203 struct ucontext_t *ucp) { 204 static bool reported_warning = false; 205 if (!reported_warning) { 206 Report("WARNING: ASan doesn't fully support makecontext/swapcontext " 207 "functions and may produce false positives in some cases!\n"); 208 reported_warning = true; 209 } 210 // Clear shadow memory for new context (it may share stack 211 // with current context). 212 uptr stack, ssize; 213 ReadContextStack(ucp, &stack, &ssize); 214 ClearShadowMemoryForContextStack(stack, ssize); 215 int res = REAL(swapcontext)(oucp, ucp); 216 // swapcontext technically does not return, but program may swap context to 217 // "oucp" later, that would look as if swapcontext() returned 0. 218 // We need to clear shadow for ucp once again, as it may be in arbitrary 219 // state. 220 ClearShadowMemoryForContextStack(stack, ssize); 221 return res; 222} 223#endif // ASAN_INTERCEPT_SWAPCONTEXT 224 225INTERCEPTOR(void, longjmp, void *env, int val) { 226 __asan_handle_no_return(); 227 REAL(longjmp)(env, val); 228} 229 230#if ASAN_INTERCEPT__LONGJMP 231INTERCEPTOR(void, _longjmp, void *env, int val) { 232 __asan_handle_no_return(); 233 REAL(_longjmp)(env, val); 234} 235#endif 236 237#if ASAN_INTERCEPT_SIGLONGJMP 238INTERCEPTOR(void, siglongjmp, void *env, int val) { 239 __asan_handle_no_return(); 240 REAL(siglongjmp)(env, val); 241} 242#endif 243 244#if ASAN_INTERCEPT___CXA_THROW 245INTERCEPTOR(void, __cxa_throw, void *a, void *b, void *c) { 246 CHECK(REAL(__cxa_throw)); 247 __asan_handle_no_return(); 248 REAL(__cxa_throw)(a, b, c); 249} 250#endif 251 252// intercept mlock and friends. 253// Since asan maps 16T of RAM, mlock is completely unfriendly to asan. 254// All functions return 0 (success). 255static void MlockIsUnsupported() { 256 static bool printed = false; 257 if (printed) return; 258 printed = true; 259 if (flags()->verbosity > 0) { 260 Printf("INFO: AddressSanitizer ignores " 261 "mlock/mlockall/munlock/munlockall\n"); 262 } 263} 264 265INTERCEPTOR(int, mlock, const void *addr, uptr len) { 266 MlockIsUnsupported(); 267 return 0; 268} 269 270INTERCEPTOR(int, munlock, const void *addr, uptr len) { 271 MlockIsUnsupported(); 272 return 0; 273} 274 275INTERCEPTOR(int, mlockall, int flags) { 276 MlockIsUnsupported(); 277 return 0; 278} 279 280INTERCEPTOR(int, munlockall, void) { 281 MlockIsUnsupported(); 282 return 0; 283} 284 285static inline int CharCmp(unsigned char c1, unsigned char c2) { 286 return (c1 == c2) ? 0 : (c1 < c2) ? -1 : 1; 287} 288 289INTERCEPTOR(int, memcmp, const void *a1, const void *a2, uptr size) { 290 if (!asan_inited) return internal_memcmp(a1, a2, size); 291 ENSURE_ASAN_INITED(); 292 if (flags()->replace_intrin) { 293 if (flags()->strict_memcmp) { 294 // Check the entire regions even if the first bytes of the buffers are 295 // different. 296 ASAN_READ_RANGE(a1, size); 297 ASAN_READ_RANGE(a2, size); 298 // Fallthrough to REAL(memcmp) below. 299 } else { 300 unsigned char c1 = 0, c2 = 0; 301 const unsigned char *s1 = (const unsigned char*)a1; 302 const unsigned char *s2 = (const unsigned char*)a2; 303 uptr i; 304 for (i = 0; i < size; i++) { 305 c1 = s1[i]; 306 c2 = s2[i]; 307 if (c1 != c2) break; 308 } 309 ASAN_READ_RANGE(s1, Min(i + 1, size)); 310 ASAN_READ_RANGE(s2, Min(i + 1, size)); 311 return CharCmp(c1, c2); 312 } 313 } 314 return REAL(memcmp(a1, a2, size)); 315} 316 317INTERCEPTOR(void*, memcpy, void *to, const void *from, uptr size) { 318 if (!asan_inited) return internal_memcpy(to, from, size); 319 // memcpy is called during __asan_init() from the internals 320 // of printf(...). 321 if (asan_init_is_running) { 322 return REAL(memcpy)(to, from, size); 323 } 324 ENSURE_ASAN_INITED(); 325 if (flags()->replace_intrin) { 326 if (to != from) { 327 // We do not treat memcpy with to==from as a bug. 328 // See http://llvm.org/bugs/show_bug.cgi?id=11763. 329 CHECK_RANGES_OVERLAP("memcpy", to, size, from, size); 330 } 331 ASAN_READ_RANGE(from, size); 332 ASAN_WRITE_RANGE(to, size); 333 } 334 // Interposing of resolver functions is broken on Mac OS 10.7 and 10.8. 335 // See also http://code.google.com/p/address-sanitizer/issues/detail?id=116. 336 return internal_memcpy(to, from, size); 337} 338 339INTERCEPTOR(void*, memmove, void *to, const void *from, uptr size) { 340 if (!asan_inited) return internal_memmove(to, from, size); 341 if (asan_init_is_running) { 342 return REAL(memmove)(to, from, size); 343 } 344 ENSURE_ASAN_INITED(); 345 if (flags()->replace_intrin) { 346 ASAN_READ_RANGE(from, size); 347 ASAN_WRITE_RANGE(to, size); 348 } 349 // Interposing of resolver functions is broken on Mac OS 10.7 and 10.8. 350 // See also http://code.google.com/p/address-sanitizer/issues/detail?id=116. 351 return internal_memmove(to, from, size); 352} 353 354INTERCEPTOR(void*, memset, void *block, int c, uptr size) { 355 if (!asan_inited) return internal_memset(block, c, size); 356 // memset is called inside Printf. 357 if (asan_init_is_running) { 358 return REAL(memset)(block, c, size); 359 } 360 ENSURE_ASAN_INITED(); 361 if (flags()->replace_intrin) { 362 ASAN_WRITE_RANGE(block, size); 363 } 364 return REAL(memset)(block, c, size); 365} 366 367INTERCEPTOR(char*, strchr, const char *str, int c) { 368 if (!asan_inited) return internal_strchr(str, c); 369 // strchr is called inside create_purgeable_zone() when MallocGuardEdges=1 is 370 // used. 371 if (asan_init_is_running) { 372 return REAL(strchr)(str, c); 373 } 374 ENSURE_ASAN_INITED(); 375 char *result = REAL(strchr)(str, c); 376 if (flags()->replace_str) { 377 uptr bytes_read = (result ? result - str : REAL(strlen)(str)) + 1; 378 ASAN_READ_RANGE(str, bytes_read); 379 } 380 return result; 381} 382 383#if ASAN_INTERCEPT_INDEX 384# if ASAN_USE_ALIAS_ATTRIBUTE_FOR_INDEX 385INTERCEPTOR(char*, index, const char *string, int c) 386 ALIAS(WRAPPER_NAME(strchr)); 387# else 388# if SANITIZER_MAC 389DECLARE_REAL(char*, index, const char *string, int c) 390OVERRIDE_FUNCTION(index, strchr); 391# else 392DEFINE_REAL(char*, index, const char *string, int c) 393# endif 394# endif 395#endif // ASAN_INTERCEPT_INDEX 396 397// For both strcat() and strncat() we need to check the validity of |to| 398// argument irrespective of the |from| length. 399INTERCEPTOR(char*, strcat, char *to, const char *from) { // NOLINT 400 ENSURE_ASAN_INITED(); 401 if (flags()->replace_str) { 402 uptr from_length = REAL(strlen)(from); 403 ASAN_READ_RANGE(from, from_length + 1); 404 uptr to_length = REAL(strlen)(to); 405 ASAN_READ_RANGE(to, to_length); 406 ASAN_WRITE_RANGE(to + to_length, from_length + 1); 407 // If the copying actually happens, the |from| string should not overlap 408 // with the resulting string starting at |to|, which has a length of 409 // to_length + from_length + 1. 410 if (from_length > 0) { 411 CHECK_RANGES_OVERLAP("strcat", to, from_length + to_length + 1, 412 from, from_length + 1); 413 } 414 } 415 return REAL(strcat)(to, from); // NOLINT 416} 417 418INTERCEPTOR(char*, strncat, char *to, const char *from, uptr size) { 419 ENSURE_ASAN_INITED(); 420 if (flags()->replace_str) { 421 uptr from_length = MaybeRealStrnlen(from, size); 422 uptr copy_length = Min(size, from_length + 1); 423 ASAN_READ_RANGE(from, copy_length); 424 uptr to_length = REAL(strlen)(to); 425 ASAN_READ_RANGE(to, to_length); 426 ASAN_WRITE_RANGE(to + to_length, from_length + 1); 427 if (from_length > 0) { 428 CHECK_RANGES_OVERLAP("strncat", to, to_length + copy_length + 1, 429 from, copy_length); 430 } 431 } 432 return REAL(strncat)(to, from, size); 433} 434 435INTERCEPTOR(int, strcmp, const char *s1, const char *s2) { 436 if (!asan_inited) return internal_strcmp(s1, s2); 437 if (asan_init_is_running) { 438 return REAL(strcmp)(s1, s2); 439 } 440 ENSURE_ASAN_INITED(); 441 unsigned char c1, c2; 442 uptr i; 443 for (i = 0; ; i++) { 444 c1 = (unsigned char)s1[i]; 445 c2 = (unsigned char)s2[i]; 446 if (c1 != c2 || c1 == '\0') break; 447 } 448 ASAN_READ_RANGE(s1, i + 1); 449 ASAN_READ_RANGE(s2, i + 1); 450 return CharCmp(c1, c2); 451} 452 453INTERCEPTOR(char*, strcpy, char *to, const char *from) { // NOLINT 454#if SANITIZER_MAC 455 if (!asan_inited) return REAL(strcpy)(to, from); // NOLINT 456#endif 457 // strcpy is called from malloc_default_purgeable_zone() 458 // in __asan::ReplaceSystemAlloc() on Mac. 459 if (asan_init_is_running) { 460 return REAL(strcpy)(to, from); // NOLINT 461 } 462 ENSURE_ASAN_INITED(); 463 if (flags()->replace_str) { 464 uptr from_size = REAL(strlen)(from) + 1; 465 CHECK_RANGES_OVERLAP("strcpy", to, from_size, from, from_size); 466 ASAN_READ_RANGE(from, from_size); 467 ASAN_WRITE_RANGE(to, from_size); 468 } 469 return REAL(strcpy)(to, from); // NOLINT 470} 471 472#if ASAN_INTERCEPT_STRDUP 473INTERCEPTOR(char*, strdup, const char *s) { 474 if (!asan_inited) return internal_strdup(s); 475 ENSURE_ASAN_INITED(); 476 uptr length = REAL(strlen)(s); 477 if (flags()->replace_str) { 478 ASAN_READ_RANGE(s, length + 1); 479 } 480 GET_STACK_TRACE_MALLOC; 481 void *new_mem = asan_malloc(length + 1, &stack); 482 REAL(memcpy)(new_mem, s, length + 1); 483 return reinterpret_cast<char*>(new_mem); 484} 485#endif 486 487INTERCEPTOR(uptr, strlen, const char *s) { 488 if (!asan_inited) return internal_strlen(s); 489 // strlen is called from malloc_default_purgeable_zone() 490 // in __asan::ReplaceSystemAlloc() on Mac. 491 if (asan_init_is_running) { 492 return REAL(strlen)(s); 493 } 494 ENSURE_ASAN_INITED(); 495 uptr length = REAL(strlen)(s); 496 if (flags()->replace_str) { 497 ASAN_READ_RANGE(s, length + 1); 498 } 499 return length; 500} 501 502INTERCEPTOR(int, strncmp, const char *s1, const char *s2, uptr size) { 503 if (!asan_inited) return internal_strncmp(s1, s2, size); 504 // strncmp is called from malloc_default_purgeable_zone() 505 // in __asan::ReplaceSystemAlloc() on Mac. 506 if (asan_init_is_running) { 507 return REAL(strncmp)(s1, s2, size); 508 } 509 ENSURE_ASAN_INITED(); 510 unsigned char c1 = 0, c2 = 0; 511 uptr i; 512 for (i = 0; i < size; i++) { 513 c1 = (unsigned char)s1[i]; 514 c2 = (unsigned char)s2[i]; 515 if (c1 != c2 || c1 == '\0') break; 516 } 517 ASAN_READ_RANGE(s1, Min(i + 1, size)); 518 ASAN_READ_RANGE(s2, Min(i + 1, size)); 519 return CharCmp(c1, c2); 520} 521 522INTERCEPTOR(char*, strncpy, char *to, const char *from, uptr size) { 523 ENSURE_ASAN_INITED(); 524 if (flags()->replace_str) { 525 uptr from_size = Min(size, MaybeRealStrnlen(from, size) + 1); 526 CHECK_RANGES_OVERLAP("strncpy", to, from_size, from, from_size); 527 ASAN_READ_RANGE(from, from_size); 528 ASAN_WRITE_RANGE(to, size); 529 } 530 return REAL(strncpy)(to, from, size); 531} 532 533#if ASAN_INTERCEPT_STRNLEN 534INTERCEPTOR(uptr, strnlen, const char *s, uptr maxlen) { 535 ENSURE_ASAN_INITED(); 536 uptr length = REAL(strnlen)(s, maxlen); 537 if (flags()->replace_str) { 538 ASAN_READ_RANGE(s, Min(length + 1, maxlen)); 539 } 540 return length; 541} 542#endif // ASAN_INTERCEPT_STRNLEN 543 544static inline bool IsValidStrtolBase(int base) { 545 return (base == 0) || (2 <= base && base <= 36); 546} 547 548static inline void FixRealStrtolEndptr(const char *nptr, char **endptr) { 549 CHECK(endptr); 550 if (nptr == *endptr) { 551 // No digits were found at strtol call, we need to find out the last 552 // symbol accessed by strtoll on our own. 553 // We get this symbol by skipping leading blanks and optional +/- sign. 554 while (IsSpace(*nptr)) nptr++; 555 if (*nptr == '+' || *nptr == '-') nptr++; 556 *endptr = (char*)nptr; 557 } 558 CHECK(*endptr >= nptr); 559} 560 561INTERCEPTOR(long, strtol, const char *nptr, // NOLINT 562 char **endptr, int base) { 563 ENSURE_ASAN_INITED(); 564 if (!flags()->replace_str) { 565 return REAL(strtol)(nptr, endptr, base); 566 } 567 char *real_endptr; 568 long result = REAL(strtol)(nptr, &real_endptr, base); // NOLINT 569 if (endptr != 0) { 570 *endptr = real_endptr; 571 } 572 if (IsValidStrtolBase(base)) { 573 FixRealStrtolEndptr(nptr, &real_endptr); 574 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 575 } 576 return result; 577} 578 579INTERCEPTOR(int, atoi, const char *nptr) { 580#if SANITIZER_MAC 581 if (!asan_inited) return REAL(atoi)(nptr); 582#endif 583 ENSURE_ASAN_INITED(); 584 if (!flags()->replace_str) { 585 return REAL(atoi)(nptr); 586 } 587 char *real_endptr; 588 // "man atoi" tells that behavior of atoi(nptr) is the same as 589 // strtol(nptr, 0, 10), i.e. it sets errno to ERANGE if the 590 // parsed integer can't be stored in *long* type (even if it's 591 // different from int). So, we just imitate this behavior. 592 int result = REAL(strtol)(nptr, &real_endptr, 10); 593 FixRealStrtolEndptr(nptr, &real_endptr); 594 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 595 return result; 596} 597 598INTERCEPTOR(long, atol, const char *nptr) { // NOLINT 599#if SANITIZER_MAC 600 if (!asan_inited) return REAL(atol)(nptr); 601#endif 602 ENSURE_ASAN_INITED(); 603 if (!flags()->replace_str) { 604 return REAL(atol)(nptr); 605 } 606 char *real_endptr; 607 long result = REAL(strtol)(nptr, &real_endptr, 10); // NOLINT 608 FixRealStrtolEndptr(nptr, &real_endptr); 609 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 610 return result; 611} 612 613#if ASAN_INTERCEPT_ATOLL_AND_STRTOLL 614INTERCEPTOR(long long, strtoll, const char *nptr, // NOLINT 615 char **endptr, int base) { 616 ENSURE_ASAN_INITED(); 617 if (!flags()->replace_str) { 618 return REAL(strtoll)(nptr, endptr, base); 619 } 620 char *real_endptr; 621 long long result = REAL(strtoll)(nptr, &real_endptr, base); // NOLINT 622 if (endptr != 0) { 623 *endptr = real_endptr; 624 } 625 // If base has unsupported value, strtoll can exit with EINVAL 626 // without reading any characters. So do additional checks only 627 // if base is valid. 628 if (IsValidStrtolBase(base)) { 629 FixRealStrtolEndptr(nptr, &real_endptr); 630 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 631 } 632 return result; 633} 634 635INTERCEPTOR(long long, atoll, const char *nptr) { // NOLINT 636 ENSURE_ASAN_INITED(); 637 if (!flags()->replace_str) { 638 return REAL(atoll)(nptr); 639 } 640 char *real_endptr; 641 long long result = REAL(strtoll)(nptr, &real_endptr, 10); // NOLINT 642 FixRealStrtolEndptr(nptr, &real_endptr); 643 ASAN_READ_RANGE(nptr, (real_endptr - nptr) + 1); 644 return result; 645} 646#endif // ASAN_INTERCEPT_ATOLL_AND_STRTOLL 647 648static void AtCxaAtexit(void *unused) { 649 (void)unused; 650 StopInitOrderChecking(); 651} 652 653#if ASAN_INTERCEPT___CXA_ATEXIT 654INTERCEPTOR(int, __cxa_atexit, void (*func)(void *), void *arg, 655 void *dso_handle) { 656 ENSURE_ASAN_INITED(); 657 int res = REAL(__cxa_atexit)(func, arg, dso_handle); 658 REAL(__cxa_atexit)(AtCxaAtexit, 0, 0); 659 return res; 660} 661#endif // ASAN_INTERCEPT___CXA_ATEXIT 662 663#if !SANITIZER_MAC 664#define ASAN_INTERCEPT_FUNC(name) do { \ 665 if (!INTERCEPT_FUNCTION(name) && flags()->verbosity > 0) \ 666 Report("AddressSanitizer: failed to intercept '" #name "'\n"); \ 667 } while (0) 668#else 669// OS X interceptors don't need to be initialized with INTERCEPT_FUNCTION. 670#define ASAN_INTERCEPT_FUNC(name) 671#endif // SANITIZER_MAC 672 673#if SANITIZER_WINDOWS 674INTERCEPTOR_WINAPI(DWORD, CreateThread, 675 void* security, uptr stack_size, 676 DWORD (__stdcall *start_routine)(void*), void* arg, 677 DWORD thr_flags, void* tid) { 678 // Strict init-order checking in thread-hostile. 679 if (flags()->strict_init_order) 680 StopInitOrderChecking(); 681 GET_STACK_TRACE_THREAD; 682 u32 current_tid = GetCurrentTidOrInvalid(); 683 AsanThread *t = AsanThread::Create(start_routine, arg); 684 CreateThreadContextArgs args = { t, &stack }; 685 bool detached = false; // FIXME: how can we determine it on Windows? 686 asanThreadRegistry().CreateThread(*(uptr*)t, detached, current_tid, &args); 687 return REAL(CreateThread)(security, stack_size, 688 asan_thread_start, t, thr_flags, tid); 689} 690 691namespace __asan { 692void InitializeWindowsInterceptors() { 693 ASAN_INTERCEPT_FUNC(CreateThread); 694} 695 696} // namespace __asan 697#endif 698 699// ---------------------- InitializeAsanInterceptors ---------------- {{{1 700namespace __asan { 701void InitializeAsanInterceptors() { 702 static bool was_called_once; 703 CHECK(was_called_once == false); 704 was_called_once = true; 705 SANITIZER_COMMON_INTERCEPTORS_INIT; 706 707 // Intercept mem* functions. 708 ASAN_INTERCEPT_FUNC(memcmp); 709 ASAN_INTERCEPT_FUNC(memmove); 710 ASAN_INTERCEPT_FUNC(memset); 711 if (PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE) { 712 ASAN_INTERCEPT_FUNC(memcpy); 713 } 714 715 // Intercept str* functions. 716 ASAN_INTERCEPT_FUNC(strcat); // NOLINT 717 ASAN_INTERCEPT_FUNC(strchr); 718 ASAN_INTERCEPT_FUNC(strcmp); 719 ASAN_INTERCEPT_FUNC(strcpy); // NOLINT 720 ASAN_INTERCEPT_FUNC(strlen); 721 ASAN_INTERCEPT_FUNC(strncat); 722 ASAN_INTERCEPT_FUNC(strncmp); 723 ASAN_INTERCEPT_FUNC(strncpy); 724#if ASAN_INTERCEPT_STRDUP 725 ASAN_INTERCEPT_FUNC(strdup); 726#endif 727#if ASAN_INTERCEPT_STRNLEN 728 ASAN_INTERCEPT_FUNC(strnlen); 729#endif 730#if ASAN_INTERCEPT_INDEX && ASAN_USE_ALIAS_ATTRIBUTE_FOR_INDEX 731 ASAN_INTERCEPT_FUNC(index); 732#endif 733 734 ASAN_INTERCEPT_FUNC(atoi); 735 ASAN_INTERCEPT_FUNC(atol); 736 ASAN_INTERCEPT_FUNC(strtol); 737#if ASAN_INTERCEPT_ATOLL_AND_STRTOLL 738 ASAN_INTERCEPT_FUNC(atoll); 739 ASAN_INTERCEPT_FUNC(strtoll); 740#endif 741 742#if ASAN_INTERCEPT_MLOCKX 743 // Intercept mlock/munlock. 744 ASAN_INTERCEPT_FUNC(mlock); 745 ASAN_INTERCEPT_FUNC(munlock); 746 ASAN_INTERCEPT_FUNC(mlockall); 747 ASAN_INTERCEPT_FUNC(munlockall); 748#endif 749 750 // Intecept signal- and jump-related functions. 751 ASAN_INTERCEPT_FUNC(longjmp); 752#if ASAN_INTERCEPT_SIGNAL_AND_SIGACTION 753 ASAN_INTERCEPT_FUNC(sigaction); 754 ASAN_INTERCEPT_FUNC(signal); 755#endif 756#if ASAN_INTERCEPT_SWAPCONTEXT 757 ASAN_INTERCEPT_FUNC(swapcontext); 758#endif 759#if ASAN_INTERCEPT__LONGJMP 760 ASAN_INTERCEPT_FUNC(_longjmp); 761#endif 762#if ASAN_INTERCEPT_SIGLONGJMP 763 ASAN_INTERCEPT_FUNC(siglongjmp); 764#endif 765 766 // Intercept exception handling functions. 767#if ASAN_INTERCEPT___CXA_THROW 768 INTERCEPT_FUNCTION(__cxa_throw); 769#endif 770 771 // Intercept threading-related functions 772#if ASAN_INTERCEPT_PTHREAD_CREATE 773 ASAN_INTERCEPT_FUNC(pthread_create); 774#endif 775 776 // Intercept atexit function. 777#if ASAN_INTERCEPT___CXA_ATEXIT 778 ASAN_INTERCEPT_FUNC(__cxa_atexit); 779#endif 780 781 // Some Windows-specific interceptors. 782#if SANITIZER_WINDOWS 783 InitializeWindowsInterceptors(); 784#endif 785 786 if (flags()->verbosity > 0) { 787 Report("AddressSanitizer: libc interceptors initialized\n"); 788 } 789} 790 791} // namespace __asan 792