1//===-- asan_rtl.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// Main file of the ASan run-time library. 13//===----------------------------------------------------------------------===// 14 15#include "asan_activation.h" 16#include "asan_allocator.h" 17#include "asan_interceptors.h" 18#include "asan_interface_internal.h" 19#include "asan_internal.h" 20#include "asan_mapping.h" 21#include "asan_poisoning.h" 22#include "asan_report.h" 23#include "asan_stack.h" 24#include "asan_stats.h" 25#include "asan_suppressions.h" 26#include "asan_thread.h" 27#include "sanitizer_common/sanitizer_atomic.h" 28#include "sanitizer_common/sanitizer_flags.h" 29#include "sanitizer_common/sanitizer_libc.h" 30#include "sanitizer_common/sanitizer_symbolizer.h" 31#include "lsan/lsan_common.h" 32#include "ubsan/ubsan_init.h" 33#include "ubsan/ubsan_platform.h" 34 35int __asan_option_detect_stack_use_after_return; // Global interface symbol. 36uptr *__asan_test_only_reported_buggy_pointer; // Used only for testing asan. 37 38namespace __asan { 39 40uptr AsanMappingProfile[kAsanMappingProfileSize]; 41 42static void AsanDie() { 43 static atomic_uint32_t num_calls; 44 if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) { 45 // Don't die twice - run a busy loop. 46 while (1) { } 47 } 48 if (flags()->sleep_before_dying) { 49 Report("Sleeping for %d second(s)\n", flags()->sleep_before_dying); 50 SleepForSeconds(flags()->sleep_before_dying); 51 } 52 if (flags()->unmap_shadow_on_exit) { 53 if (kMidMemBeg) { 54 UnmapOrDie((void*)kLowShadowBeg, kMidMemBeg - kLowShadowBeg); 55 UnmapOrDie((void*)kMidMemEnd, kHighShadowEnd - kMidMemEnd); 56 } else { 57 UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg); 58 } 59 } 60} 61 62static void AsanCheckFailed(const char *file, int line, const char *cond, 63 u64 v1, u64 v2) { 64 Report("AddressSanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n", file, 65 line, cond, (uptr)v1, (uptr)v2); 66 // FIXME: check for infinite recursion without a thread-local counter here. 67 PRINT_CURRENT_STACK_CHECK(); 68 Die(); 69} 70 71// -------------------------- Globals --------------------- {{{1 72int asan_inited; 73bool asan_init_is_running; 74 75#if !ASAN_FIXED_MAPPING 76uptr kHighMemEnd, kMidMemBeg, kMidMemEnd; 77#endif 78 79// -------------------------- Misc ---------------- {{{1 80void ShowStatsAndAbort() { 81 __asan_print_accumulated_stats(); 82 Die(); 83} 84 85// ---------------------- mmap -------------------- {{{1 86// Reserve memory range [beg, end]. 87// We need to use inclusive range because end+1 may not be representable. 88void ReserveShadowMemoryRange(uptr beg, uptr end, const char *name) { 89 CHECK_EQ((beg % GetPageSizeCached()), 0); 90 CHECK_EQ(((end + 1) % GetPageSizeCached()), 0); 91 uptr size = end - beg + 1; 92 DecreaseTotalMmap(size); // Don't count the shadow against mmap_limit_mb. 93 void *res = MmapFixedNoReserve(beg, size, name); 94 if (res != (void*)beg) { 95 Report("ReserveShadowMemoryRange failed while trying to map 0x%zx bytes. " 96 "Perhaps you're using ulimit -v\n", size); 97 Abort(); 98 } 99 if (common_flags()->no_huge_pages_for_shadow) 100 NoHugePagesInRegion(beg, size); 101 if (common_flags()->use_madv_dontdump) 102 DontDumpShadowMemory(beg, size); 103} 104 105// --------------- LowLevelAllocateCallbac ---------- {{{1 106static void OnLowLevelAllocate(uptr ptr, uptr size) { 107 PoisonShadow(ptr, size, kAsanInternalHeapMagic); 108} 109 110// -------------------------- Run-time entry ------------------- {{{1 111// exported functions 112#define ASAN_REPORT_ERROR(type, is_write, size) \ 113extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 114void __asan_report_ ## type ## size(uptr addr) { \ 115 GET_CALLER_PC_BP_SP; \ 116 ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true); \ 117} \ 118extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 119void __asan_report_exp_ ## type ## size(uptr addr, u32 exp) { \ 120 GET_CALLER_PC_BP_SP; \ 121 ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true); \ 122} \ 123extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 124void __asan_report_ ## type ## size ## _noabort(uptr addr) { \ 125 GET_CALLER_PC_BP_SP; \ 126 ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false); \ 127} \ 128 129ASAN_REPORT_ERROR(load, false, 1) 130ASAN_REPORT_ERROR(load, false, 2) 131ASAN_REPORT_ERROR(load, false, 4) 132ASAN_REPORT_ERROR(load, false, 8) 133ASAN_REPORT_ERROR(load, false, 16) 134ASAN_REPORT_ERROR(store, true, 1) 135ASAN_REPORT_ERROR(store, true, 2) 136ASAN_REPORT_ERROR(store, true, 4) 137ASAN_REPORT_ERROR(store, true, 8) 138ASAN_REPORT_ERROR(store, true, 16) 139 140#define ASAN_REPORT_ERROR_N(type, is_write) \ 141extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 142void __asan_report_ ## type ## _n(uptr addr, uptr size) { \ 143 GET_CALLER_PC_BP_SP; \ 144 ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true); \ 145} \ 146extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 147void __asan_report_exp_ ## type ## _n(uptr addr, uptr size, u32 exp) { \ 148 GET_CALLER_PC_BP_SP; \ 149 ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true); \ 150} \ 151extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 152void __asan_report_ ## type ## _n_noabort(uptr addr, uptr size) { \ 153 GET_CALLER_PC_BP_SP; \ 154 ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false); \ 155} \ 156 157ASAN_REPORT_ERROR_N(load, false) 158ASAN_REPORT_ERROR_N(store, true) 159 160#define ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp_arg, fatal) \ 161 uptr sp = MEM_TO_SHADOW(addr); \ 162 uptr s = size <= SHADOW_GRANULARITY ? *reinterpret_cast<u8 *>(sp) \ 163 : *reinterpret_cast<u16 *>(sp); \ 164 if (UNLIKELY(s)) { \ 165 if (UNLIKELY(size >= SHADOW_GRANULARITY || \ 166 ((s8)((addr & (SHADOW_GRANULARITY - 1)) + size - 1)) >= \ 167 (s8)s)) { \ 168 if (__asan_test_only_reported_buggy_pointer) { \ 169 *__asan_test_only_reported_buggy_pointer = addr; \ 170 } else { \ 171 GET_CALLER_PC_BP_SP; \ 172 ReportGenericError(pc, bp, sp, addr, is_write, size, exp_arg, \ 173 fatal); \ 174 } \ 175 } \ 176 } 177 178#define ASAN_MEMORY_ACCESS_CALLBACK(type, is_write, size) \ 179 extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 180 void __asan_##type##size(uptr addr) { \ 181 ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, true) \ 182 } \ 183 extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 184 void __asan_exp_##type##size(uptr addr, u32 exp) { \ 185 ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp, true) \ 186 } \ 187 extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 188 void __asan_##type##size ## _noabort(uptr addr) { \ 189 ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, false) \ 190 } \ 191 192ASAN_MEMORY_ACCESS_CALLBACK(load, false, 1) 193ASAN_MEMORY_ACCESS_CALLBACK(load, false, 2) 194ASAN_MEMORY_ACCESS_CALLBACK(load, false, 4) 195ASAN_MEMORY_ACCESS_CALLBACK(load, false, 8) 196ASAN_MEMORY_ACCESS_CALLBACK(load, false, 16) 197ASAN_MEMORY_ACCESS_CALLBACK(store, true, 1) 198ASAN_MEMORY_ACCESS_CALLBACK(store, true, 2) 199ASAN_MEMORY_ACCESS_CALLBACK(store, true, 4) 200ASAN_MEMORY_ACCESS_CALLBACK(store, true, 8) 201ASAN_MEMORY_ACCESS_CALLBACK(store, true, 16) 202 203extern "C" 204NOINLINE INTERFACE_ATTRIBUTE 205void __asan_loadN(uptr addr, uptr size) { 206 if (__asan_region_is_poisoned(addr, size)) { 207 GET_CALLER_PC_BP_SP; 208 ReportGenericError(pc, bp, sp, addr, false, size, 0, true); 209 } 210} 211 212extern "C" 213NOINLINE INTERFACE_ATTRIBUTE 214void __asan_exp_loadN(uptr addr, uptr size, u32 exp) { 215 if (__asan_region_is_poisoned(addr, size)) { 216 GET_CALLER_PC_BP_SP; 217 ReportGenericError(pc, bp, sp, addr, false, size, exp, true); 218 } 219} 220 221extern "C" 222NOINLINE INTERFACE_ATTRIBUTE 223void __asan_loadN_noabort(uptr addr, uptr size) { 224 if (__asan_region_is_poisoned(addr, size)) { 225 GET_CALLER_PC_BP_SP; 226 ReportGenericError(pc, bp, sp, addr, false, size, 0, false); 227 } 228} 229 230extern "C" 231NOINLINE INTERFACE_ATTRIBUTE 232void __asan_storeN(uptr addr, uptr size) { 233 if (__asan_region_is_poisoned(addr, size)) { 234 GET_CALLER_PC_BP_SP; 235 ReportGenericError(pc, bp, sp, addr, true, size, 0, true); 236 } 237} 238 239extern "C" 240NOINLINE INTERFACE_ATTRIBUTE 241void __asan_exp_storeN(uptr addr, uptr size, u32 exp) { 242 if (__asan_region_is_poisoned(addr, size)) { 243 GET_CALLER_PC_BP_SP; 244 ReportGenericError(pc, bp, sp, addr, true, size, exp, true); 245 } 246} 247 248extern "C" 249NOINLINE INTERFACE_ATTRIBUTE 250void __asan_storeN_noabort(uptr addr, uptr size) { 251 if (__asan_region_is_poisoned(addr, size)) { 252 GET_CALLER_PC_BP_SP; 253 ReportGenericError(pc, bp, sp, addr, true, size, 0, false); 254 } 255} 256 257// Force the linker to keep the symbols for various ASan interface functions. 258// We want to keep those in the executable in order to let the instrumented 259// dynamic libraries access the symbol even if it is not used by the executable 260// itself. This should help if the build system is removing dead code at link 261// time. 262static NOINLINE void force_interface_symbols() { 263 volatile int fake_condition = 0; // prevent dead condition elimination. 264 // __asan_report_* functions are noreturn, so we need a switch to prevent 265 // the compiler from removing any of them. 266 switch (fake_condition) { 267 case 1: __asan_report_load1(0); break; 268 case 2: __asan_report_load2(0); break; 269 case 3: __asan_report_load4(0); break; 270 case 4: __asan_report_load8(0); break; 271 case 5: __asan_report_load16(0); break; 272 case 6: __asan_report_load_n(0, 0); break; 273 case 7: __asan_report_store1(0); break; 274 case 8: __asan_report_store2(0); break; 275 case 9: __asan_report_store4(0); break; 276 case 10: __asan_report_store8(0); break; 277 case 11: __asan_report_store16(0); break; 278 case 12: __asan_report_store_n(0, 0); break; 279 case 13: __asan_report_exp_load1(0, 0); break; 280 case 14: __asan_report_exp_load2(0, 0); break; 281 case 15: __asan_report_exp_load4(0, 0); break; 282 case 16: __asan_report_exp_load8(0, 0); break; 283 case 17: __asan_report_exp_load16(0, 0); break; 284 case 18: __asan_report_exp_load_n(0, 0, 0); break; 285 case 19: __asan_report_exp_store1(0, 0); break; 286 case 20: __asan_report_exp_store2(0, 0); break; 287 case 21: __asan_report_exp_store4(0, 0); break; 288 case 22: __asan_report_exp_store8(0, 0); break; 289 case 23: __asan_report_exp_store16(0, 0); break; 290 case 24: __asan_report_exp_store_n(0, 0, 0); break; 291 case 25: __asan_register_globals(nullptr, 0); break; 292 case 26: __asan_unregister_globals(nullptr, 0); break; 293 case 27: __asan_set_death_callback(nullptr); break; 294 case 28: __asan_set_error_report_callback(nullptr); break; 295 case 29: __asan_handle_no_return(); break; 296 case 30: __asan_address_is_poisoned(nullptr); break; 297 case 31: __asan_poison_memory_region(nullptr, 0); break; 298 case 32: __asan_unpoison_memory_region(nullptr, 0); break; 299 case 34: __asan_before_dynamic_init(nullptr); break; 300 case 35: __asan_after_dynamic_init(); break; 301 case 36: __asan_poison_stack_memory(0, 0); break; 302 case 37: __asan_unpoison_stack_memory(0, 0); break; 303 case 38: __asan_region_is_poisoned(0, 0); break; 304 case 39: __asan_describe_address(0); break; 305 } 306} 307 308static void asan_atexit() { 309 Printf("AddressSanitizer exit stats:\n"); 310 __asan_print_accumulated_stats(); 311 // Print AsanMappingProfile. 312 for (uptr i = 0; i < kAsanMappingProfileSize; i++) { 313 if (AsanMappingProfile[i] == 0) continue; 314 Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]); 315 } 316} 317 318static void InitializeHighMemEnd() { 319#if !ASAN_FIXED_MAPPING 320 kHighMemEnd = GetMaxVirtualAddress(); 321 // Increase kHighMemEnd to make sure it's properly 322 // aligned together with kHighMemBeg: 323 kHighMemEnd |= SHADOW_GRANULARITY * GetPageSizeCached() - 1; 324#endif // !ASAN_FIXED_MAPPING 325 CHECK_EQ((kHighMemBeg % GetPageSizeCached()), 0); 326} 327 328static void ProtectGap(uptr addr, uptr size) { 329 if (!flags()->protect_shadow_gap) 330 return; 331 void *res = MmapNoAccess(addr, size, "shadow gap"); 332 if (addr == (uptr)res) 333 return; 334 // A few pages at the start of the address space can not be protected. 335 // But we really want to protect as much as possible, to prevent this memory 336 // being returned as a result of a non-FIXED mmap(). 337 if (addr == kZeroBaseShadowStart) { 338 uptr step = GetPageSizeCached(); 339 while (size > step && addr < kZeroBaseMaxShadowStart) { 340 addr += step; 341 size -= step; 342 void *res = MmapNoAccess(addr, size, "shadow gap"); 343 if (addr == (uptr)res) 344 return; 345 } 346 } 347 348 Report("ERROR: Failed to protect the shadow gap. " 349 "ASan cannot proceed correctly. ABORTING.\n"); 350 DumpProcessMap(); 351 Die(); 352} 353 354static void PrintAddressSpaceLayout() { 355 Printf("|| `[%p, %p]` || HighMem ||\n", 356 (void*)kHighMemBeg, (void*)kHighMemEnd); 357 Printf("|| `[%p, %p]` || HighShadow ||\n", 358 (void*)kHighShadowBeg, (void*)kHighShadowEnd); 359 if (kMidMemBeg) { 360 Printf("|| `[%p, %p]` || ShadowGap3 ||\n", 361 (void*)kShadowGap3Beg, (void*)kShadowGap3End); 362 Printf("|| `[%p, %p]` || MidMem ||\n", 363 (void*)kMidMemBeg, (void*)kMidMemEnd); 364 Printf("|| `[%p, %p]` || ShadowGap2 ||\n", 365 (void*)kShadowGap2Beg, (void*)kShadowGap2End); 366 Printf("|| `[%p, %p]` || MidShadow ||\n", 367 (void*)kMidShadowBeg, (void*)kMidShadowEnd); 368 } 369 Printf("|| `[%p, %p]` || ShadowGap ||\n", 370 (void*)kShadowGapBeg, (void*)kShadowGapEnd); 371 if (kLowShadowBeg) { 372 Printf("|| `[%p, %p]` || LowShadow ||\n", 373 (void*)kLowShadowBeg, (void*)kLowShadowEnd); 374 Printf("|| `[%p, %p]` || LowMem ||\n", 375 (void*)kLowMemBeg, (void*)kLowMemEnd); 376 } 377 Printf("MemToShadow(shadow): %p %p %p %p", 378 (void*)MEM_TO_SHADOW(kLowShadowBeg), 379 (void*)MEM_TO_SHADOW(kLowShadowEnd), 380 (void*)MEM_TO_SHADOW(kHighShadowBeg), 381 (void*)MEM_TO_SHADOW(kHighShadowEnd)); 382 if (kMidMemBeg) { 383 Printf(" %p %p", 384 (void*)MEM_TO_SHADOW(kMidShadowBeg), 385 (void*)MEM_TO_SHADOW(kMidShadowEnd)); 386 } 387 Printf("\n"); 388 Printf("redzone=%zu\n", (uptr)flags()->redzone); 389 Printf("max_redzone=%zu\n", (uptr)flags()->max_redzone); 390 Printf("quarantine_size_mb=%zuM\n", (uptr)flags()->quarantine_size_mb); 391 Printf("malloc_context_size=%zu\n", 392 (uptr)common_flags()->malloc_context_size); 393 394 Printf("SHADOW_SCALE: %d\n", (int)SHADOW_SCALE); 395 Printf("SHADOW_GRANULARITY: %d\n", (int)SHADOW_GRANULARITY); 396 Printf("SHADOW_OFFSET: 0x%zx\n", (uptr)SHADOW_OFFSET); 397 CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7); 398 if (kMidMemBeg) 399 CHECK(kMidShadowBeg > kLowShadowEnd && 400 kMidMemBeg > kMidShadowEnd && 401 kHighShadowBeg > kMidMemEnd); 402} 403 404static void AsanInitInternal() { 405 if (LIKELY(asan_inited)) return; 406 SanitizerToolName = "AddressSanitizer"; 407 CHECK(!asan_init_is_running && "ASan init calls itself!"); 408 asan_init_is_running = true; 409 410 CacheBinaryName(); 411 412 // Initialize flags. This must be done early, because most of the 413 // initialization steps look at flags(). 414 InitializeFlags(); 415 416 AsanCheckIncompatibleRT(); 417 AsanCheckDynamicRTPrereqs(); 418 419 SetCanPoisonMemory(flags()->poison_heap); 420 SetMallocContextSize(common_flags()->malloc_context_size); 421 422 InitializeHighMemEnd(); 423 424 // Make sure we are not statically linked. 425 AsanDoesNotSupportStaticLinkage(); 426 427 // Install tool-specific callbacks in sanitizer_common. 428 AddDieCallback(AsanDie); 429 SetCheckFailedCallback(AsanCheckFailed); 430 SetPrintfAndReportCallback(AppendToErrorMessageBuffer); 431 432 __sanitizer_set_report_path(common_flags()->log_path); 433 434 // Enable UAR detection, if required. 435 __asan_option_detect_stack_use_after_return = 436 flags()->detect_stack_use_after_return; 437 438 // Re-exec ourselves if we need to set additional env or command line args. 439 MaybeReexec(); 440 441 // Setup internal allocator callback. 442 SetLowLevelAllocateCallback(OnLowLevelAllocate); 443 444 InitializeAsanInterceptors(); 445 446 // Enable system log ("adb logcat") on Android. 447 // Doing this before interceptors are initialized crashes in: 448 // AsanInitInternal -> android_log_write -> __interceptor_strcmp 449 AndroidLogInit(); 450 451 ReplaceSystemMalloc(); 452 453 uptr shadow_start = kLowShadowBeg; 454 if (kLowShadowBeg) 455 shadow_start -= GetMmapGranularity(); 456 bool full_shadow_is_available = 457 MemoryRangeIsAvailable(shadow_start, kHighShadowEnd); 458 459#if SANITIZER_LINUX && defined(__x86_64__) && defined(_LP64) && \ 460 !ASAN_FIXED_MAPPING 461 if (!full_shadow_is_available) { 462 kMidMemBeg = kLowMemEnd < 0x3000000000ULL ? 0x3000000000ULL : 0; 463 kMidMemEnd = kLowMemEnd < 0x3000000000ULL ? 0x4fffffffffULL : 0; 464 } 465#endif 466 467 if (Verbosity()) PrintAddressSpaceLayout(); 468 469 DisableCoreDumperIfNecessary(); 470 471 if (full_shadow_is_available) { 472 // mmap the low shadow plus at least one page at the left. 473 if (kLowShadowBeg) 474 ReserveShadowMemoryRange(shadow_start, kLowShadowEnd, "low shadow"); 475 // mmap the high shadow. 476 ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd, "high shadow"); 477 // protect the gap. 478 ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1); 479 CHECK_EQ(kShadowGapEnd, kHighShadowBeg - 1); 480 } else if (kMidMemBeg && 481 MemoryRangeIsAvailable(shadow_start, kMidMemBeg - 1) && 482 MemoryRangeIsAvailable(kMidMemEnd + 1, kHighShadowEnd)) { 483 CHECK(kLowShadowBeg != kLowShadowEnd); 484 // mmap the low shadow plus at least one page at the left. 485 ReserveShadowMemoryRange(shadow_start, kLowShadowEnd, "low shadow"); 486 // mmap the mid shadow. 487 ReserveShadowMemoryRange(kMidShadowBeg, kMidShadowEnd, "mid shadow"); 488 // mmap the high shadow. 489 ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd, "high shadow"); 490 // protect the gaps. 491 ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1); 492 ProtectGap(kShadowGap2Beg, kShadowGap2End - kShadowGap2Beg + 1); 493 ProtectGap(kShadowGap3Beg, kShadowGap3End - kShadowGap3Beg + 1); 494 } else { 495 Report("Shadow memory range interleaves with an existing memory mapping. " 496 "ASan cannot proceed correctly. ABORTING.\n"); 497 Report("ASan shadow was supposed to be located in the [%p-%p] range.\n", 498 shadow_start, kHighShadowEnd); 499 DumpProcessMap(); 500 Die(); 501 } 502 503 AsanTSDInit(PlatformTSDDtor); 504 InstallDeadlySignalHandlers(AsanOnDeadlySignal); 505 506 AllocatorOptions allocator_options; 507 allocator_options.SetFrom(flags(), common_flags()); 508 InitializeAllocator(allocator_options); 509 510 MaybeStartBackgroudThread(); 511 SetSoftRssLimitExceededCallback(AsanSoftRssLimitExceededCallback); 512 513 // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited 514 // should be set to 1 prior to initializing the threads. 515 asan_inited = 1; 516 asan_init_is_running = false; 517 518 if (flags()->atexit) 519 Atexit(asan_atexit); 520 521 InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir); 522 523 // Now that ASan runtime is (mostly) initialized, deactivate it if 524 // necessary, so that it can be re-activated when requested. 525 if (flags()->start_deactivated) 526 AsanDeactivate(); 527 528 // interceptors 529 InitTlsSize(); 530 531 // Create main thread. 532 AsanThread *main_thread = AsanThread::Create( 533 /* start_routine */ nullptr, /* arg */ nullptr, /* parent_tid */ 0, 534 /* stack */ nullptr, /* detached */ true); 535 CHECK_EQ(0, main_thread->tid()); 536 SetCurrentThread(main_thread); 537 main_thread->ThreadStart(internal_getpid(), 538 /* signal_thread_is_registered */ nullptr); 539 force_interface_symbols(); // no-op. 540 SanitizerInitializeUnwinder(); 541 542#if CAN_SANITIZE_LEAKS 543 __lsan::InitCommonLsan(); 544 if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) { 545 Atexit(__lsan::DoLeakCheck); 546 } 547#endif // CAN_SANITIZE_LEAKS 548 549#if CAN_SANITIZE_UB 550 __ubsan::InitAsPlugin(); 551#endif 552 553 InitializeSuppressions(); 554 555 VReport(1, "AddressSanitizer Init done\n"); 556} 557 558// Initialize as requested from some part of ASan runtime library (interceptors, 559// allocator, etc). 560void AsanInitFromRtl() { 561 AsanInitInternal(); 562} 563 564#if ASAN_DYNAMIC 565// Initialize runtime in case it's LD_PRELOAD-ed into unsanitized executable 566// (and thus normal initializers from .preinit_array or modules haven't run). 567 568class AsanInitializer { 569public: // NOLINT 570 AsanInitializer() { 571 AsanInitFromRtl(); 572 } 573}; 574 575static AsanInitializer asan_initializer; 576#endif // ASAN_DYNAMIC 577 578} // namespace __asan 579 580// ---------------------- Interface ---------------- {{{1 581using namespace __asan; // NOLINT 582 583void NOINLINE __asan_handle_no_return() { 584 int local_stack; 585 AsanThread *curr_thread = GetCurrentThread(); 586 uptr PageSize = GetPageSizeCached(); 587 uptr top, bottom; 588 if (curr_thread) { 589 top = curr_thread->stack_top(); 590 bottom = ((uptr)&local_stack - PageSize) & ~(PageSize - 1); 591 } else { 592 // If we haven't seen this thread, try asking the OS for stack bounds. 593 uptr tls_addr, tls_size, stack_size; 594 GetThreadStackAndTls(/*main=*/false, &bottom, &stack_size, &tls_addr, 595 &tls_size); 596 top = bottom + stack_size; 597 } 598 static const uptr kMaxExpectedCleanupSize = 64 << 20; // 64M 599 if (top - bottom > kMaxExpectedCleanupSize) { 600 static bool reported_warning = false; 601 if (reported_warning) 602 return; 603 reported_warning = true; 604 Report("WARNING: ASan is ignoring requested __asan_handle_no_return: " 605 "stack top: %p; bottom %p; size: %p (%zd)\n" 606 "False positive error reports may follow\n" 607 "For details see " 608 "https://github.com/google/sanitizers/issues/189\n", 609 top, bottom, top - bottom, top - bottom); 610 return; 611 } 612 PoisonShadow(bottom, top - bottom, 0); 613 if (curr_thread && curr_thread->has_fake_stack()) 614 curr_thread->fake_stack()->HandleNoReturn(); 615} 616 617void NOINLINE __asan_set_death_callback(void (*callback)(void)) { 618 SetUserDieCallback(callback); 619} 620 621// Initialize as requested from instrumented application code. 622// We use this call as a trigger to wake up ASan from deactivated state. 623void __asan_init() { 624 AsanActivate(); 625 AsanInitInternal(); 626} 627 628void __asan_version_mismatch_check() { 629 // Do nothing. 630} 631