asan_rtl.cc revision 30e970f769ccf11e61e472c6f8b22f8e866c592f
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#include "asan_allocator.h" 15#include "asan_interceptors.h" 16#include "asan_internal.h" 17#include "asan_mapping.h" 18#include "asan_poisoning.h" 19#include "asan_report.h" 20#include "asan_stack.h" 21#include "asan_stats.h" 22#include "asan_thread.h" 23#include "sanitizer_common/sanitizer_atomic.h" 24#include "sanitizer_common/sanitizer_flags.h" 25#include "sanitizer_common/sanitizer_libc.h" 26#include "sanitizer_common/sanitizer_symbolizer.h" 27#include "lsan/lsan_common.h" 28 29namespace __asan { 30 31uptr AsanMappingProfile[kAsanMappingProfileSize]; 32 33static void AsanDie() { 34 static atomic_uint32_t num_calls; 35 if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) { 36 // Don't die twice - run a busy loop. 37 while (1) { } 38 } 39 if (flags()->sleep_before_dying) { 40 Report("Sleeping for %d second(s)\n", flags()->sleep_before_dying); 41 SleepForSeconds(flags()->sleep_before_dying); 42 } 43 if (flags()->unmap_shadow_on_exit) { 44 if (kMidMemBeg) { 45 UnmapOrDie((void*)kLowShadowBeg, kMidMemBeg - kLowShadowBeg); 46 UnmapOrDie((void*)kMidMemEnd, kHighShadowEnd - kMidMemEnd); 47 } else { 48 UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg); 49 } 50 } 51 if (death_callback) 52 death_callback(); 53 if (flags()->abort_on_error) 54 Abort(); 55 internal__exit(flags()->exitcode); 56} 57 58static void AsanCheckFailed(const char *file, int line, const char *cond, 59 u64 v1, u64 v2) { 60 Report("AddressSanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n", 61 file, line, cond, (uptr)v1, (uptr)v2); 62 // FIXME: check for infinite recursion without a thread-local counter here. 63 PRINT_CURRENT_STACK(); 64 Die(); 65} 66 67// -------------------------- Flags ------------------------- {{{1 68static const int kDefaultMallocContextSize = 30; 69 70Flags asan_flags_dont_use_directly; // use via flags(). 71 72static const char *MaybeCallAsanDefaultOptions() { 73 return (&__asan_default_options) ? __asan_default_options() : ""; 74} 75 76static const char *MaybeUseAsanDefaultOptionsCompileDefiniton() { 77#ifdef ASAN_DEFAULT_OPTIONS 78// Stringize the macro value. 79# define ASAN_STRINGIZE(x) #x 80# define ASAN_STRINGIZE_OPTIONS(options) ASAN_STRINGIZE(options) 81 return ASAN_STRINGIZE_OPTIONS(ASAN_DEFAULT_OPTIONS); 82#else 83 return ""; 84#endif 85} 86 87static void ParseFlagsFromString(Flags *f, const char *str) { 88 ParseCommonFlagsFromString(str); 89 CHECK((uptr)common_flags()->malloc_context_size <= kStackTraceMax); 90 91 ParseFlag(str, &f->quarantine_size, "quarantine_size"); 92 ParseFlag(str, &f->verbosity, "verbosity"); 93 ParseFlag(str, &f->redzone, "redzone"); 94 CHECK_GE(f->redzone, 16); 95 CHECK(IsPowerOfTwo(f->redzone)); 96 97 ParseFlag(str, &f->debug, "debug"); 98 ParseFlag(str, &f->report_globals, "report_globals"); 99 ParseFlag(str, &f->check_initialization_order, "check_initialization_order"); 100 101 ParseFlag(str, &f->replace_str, "replace_str"); 102 ParseFlag(str, &f->replace_intrin, "replace_intrin"); 103 ParseFlag(str, &f->mac_ignore_invalid_free, "mac_ignore_invalid_free"); 104 ParseFlag(str, &f->use_fake_stack, "use_fake_stack"); 105 ParseFlag(str, &f->max_malloc_fill_size, "max_malloc_fill_size"); 106 ParseFlag(str, &f->malloc_fill_byte, "malloc_fill_byte"); 107 ParseFlag(str, &f->exitcode, "exitcode"); 108 ParseFlag(str, &f->allow_user_poisoning, "allow_user_poisoning"); 109 ParseFlag(str, &f->sleep_before_dying, "sleep_before_dying"); 110 ParseFlag(str, &f->handle_segv, "handle_segv"); 111 ParseFlag(str, &f->allow_user_segv_handler, "allow_user_segv_handler"); 112 ParseFlag(str, &f->use_sigaltstack, "use_sigaltstack"); 113 ParseFlag(str, &f->check_malloc_usable_size, "check_malloc_usable_size"); 114 ParseFlag(str, &f->unmap_shadow_on_exit, "unmap_shadow_on_exit"); 115 ParseFlag(str, &f->abort_on_error, "abort_on_error"); 116 ParseFlag(str, &f->print_stats, "print_stats"); 117 ParseFlag(str, &f->print_legend, "print_legend"); 118 ParseFlag(str, &f->atexit, "atexit"); 119 ParseFlag(str, &f->disable_core, "disable_core"); 120 ParseFlag(str, &f->allow_reexec, "allow_reexec"); 121 ParseFlag(str, &f->print_full_thread_history, "print_full_thread_history"); 122 ParseFlag(str, &f->log_path, "log_path"); 123 ParseFlag(str, &f->poison_heap, "poison_heap"); 124 ParseFlag(str, &f->alloc_dealloc_mismatch, "alloc_dealloc_mismatch"); 125 ParseFlag(str, &f->use_stack_depot, "use_stack_depot"); 126 ParseFlag(str, &f->strict_memcmp, "strict_memcmp"); 127 ParseFlag(str, &f->strict_init_order, "strict_init_order"); 128 ParseFlag(str, &f->detect_leaks, "detect_leaks"); 129} 130 131void InitializeFlags(Flags *f, const char *env) { 132 CommonFlags *cf = common_flags(); 133 cf->external_symbolizer_path = GetEnv("ASAN_SYMBOLIZER_PATH"); 134 cf->symbolize = true; 135 cf->malloc_context_size = kDefaultMallocContextSize; 136 cf->fast_unwind_on_fatal = false; 137 cf->fast_unwind_on_malloc = true; 138 cf->strip_path_prefix = ""; 139 140 internal_memset(f, 0, sizeof(*f)); 141 f->quarantine_size = (ASAN_LOW_MEMORY) ? 1UL << 26 : 1UL << 28; 142 f->verbosity = 0; 143 f->redzone = 16; 144 f->debug = false; 145 f->report_globals = 1; 146 f->check_initialization_order = false; 147 f->replace_str = true; 148 f->replace_intrin = true; 149 f->mac_ignore_invalid_free = false; 150 f->use_fake_stack = true; 151 f->max_malloc_fill_size = 0x1000; // By default, fill only the first 4K. 152 f->malloc_fill_byte = 0xbe; 153 f->exitcode = ASAN_DEFAULT_FAILURE_EXITCODE; 154 f->allow_user_poisoning = true; 155 f->sleep_before_dying = 0; 156 f->handle_segv = ASAN_NEEDS_SEGV; 157 f->allow_user_segv_handler = false; 158 f->use_sigaltstack = false; 159 f->check_malloc_usable_size = true; 160 f->unmap_shadow_on_exit = false; 161 f->abort_on_error = false; 162 f->print_stats = false; 163 f->print_legend = true; 164 f->atexit = false; 165 f->disable_core = (SANITIZER_WORDSIZE == 64); 166 f->allow_reexec = true; 167 f->print_full_thread_history = true; 168 f->log_path = 0; 169 f->poison_heap = true; 170 // Turn off alloc/dealloc mismatch checker on Mac for now. 171 // TODO(glider): Fix known issues and enable this back. 172 f->alloc_dealloc_mismatch = (SANITIZER_MAC == 0);; 173 f->use_stack_depot = true; 174 f->strict_memcmp = true; 175 f->strict_init_order = false; 176 f->detect_leaks = false; 177 178 // Override from compile definition. 179 ParseFlagsFromString(f, MaybeUseAsanDefaultOptionsCompileDefiniton()); 180 181 // Override from user-specified string. 182 ParseFlagsFromString(f, MaybeCallAsanDefaultOptions()); 183 if (flags()->verbosity) { 184 Report("Using the defaults from __asan_default_options: %s\n", 185 MaybeCallAsanDefaultOptions()); 186 } 187 188 // Override from command line. 189 ParseFlagsFromString(f, env); 190 191#if !CAN_SANITIZE_LEAKS 192 if (f->detect_leaks) { 193 Report("%s: detect_leaks is not supported on this platform.\n", 194 SanitizerToolName); 195 f->detect_leaks = false; 196 } 197#endif 198 199 if (f->detect_leaks && !f->use_stack_depot) { 200 Report("%s: detect_leaks is ignored (requires use_stack_depot).\n", 201 SanitizerToolName); 202 f->detect_leaks = false; 203 } 204} 205 206// -------------------------- Globals --------------------- {{{1 207int asan_inited; 208bool asan_init_is_running; 209void (*death_callback)(void); 210 211#if !ASAN_FIXED_MAPPING 212uptr kHighMemEnd, kMidMemBeg, kMidMemEnd; 213#endif 214 215// -------------------------- Misc ---------------- {{{1 216void ShowStatsAndAbort() { 217 __asan_print_accumulated_stats(); 218 Die(); 219} 220 221// ---------------------- mmap -------------------- {{{1 222// Reserve memory range [beg, end]. 223static void ReserveShadowMemoryRange(uptr beg, uptr end) { 224 CHECK_EQ((beg % GetPageSizeCached()), 0); 225 CHECK_EQ(((end + 1) % GetPageSizeCached()), 0); 226 uptr size = end - beg + 1; 227 void *res = MmapFixedNoReserve(beg, size); 228 if (res != (void*)beg) { 229 Report("ReserveShadowMemoryRange failed while trying to map 0x%zx bytes. " 230 "Perhaps you're using ulimit -v\n", size); 231 Abort(); 232 } 233} 234 235// --------------- LowLevelAllocateCallbac ---------- {{{1 236static void OnLowLevelAllocate(uptr ptr, uptr size) { 237 PoisonShadow(ptr, size, kAsanInternalHeapMagic); 238} 239 240// -------------------------- Run-time entry ------------------- {{{1 241// exported functions 242#define ASAN_REPORT_ERROR(type, is_write, size) \ 243extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 244void __asan_report_ ## type ## size(uptr addr); \ 245void __asan_report_ ## type ## size(uptr addr) { \ 246 GET_CALLER_PC_BP_SP; \ 247 __asan_report_error(pc, bp, sp, addr, is_write, size); \ 248} 249 250ASAN_REPORT_ERROR(load, false, 1) 251ASAN_REPORT_ERROR(load, false, 2) 252ASAN_REPORT_ERROR(load, false, 4) 253ASAN_REPORT_ERROR(load, false, 8) 254ASAN_REPORT_ERROR(load, false, 16) 255ASAN_REPORT_ERROR(store, true, 1) 256ASAN_REPORT_ERROR(store, true, 2) 257ASAN_REPORT_ERROR(store, true, 4) 258ASAN_REPORT_ERROR(store, true, 8) 259ASAN_REPORT_ERROR(store, true, 16) 260 261#define ASAN_REPORT_ERROR_N(type, is_write) \ 262extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 263void __asan_report_ ## type ## _n(uptr addr, uptr size); \ 264void __asan_report_ ## type ## _n(uptr addr, uptr size) { \ 265 GET_CALLER_PC_BP_SP; \ 266 __asan_report_error(pc, bp, sp, addr, is_write, size); \ 267} 268 269ASAN_REPORT_ERROR_N(load, false) 270ASAN_REPORT_ERROR_N(store, true) 271 272// Force the linker to keep the symbols for various ASan interface functions. 273// We want to keep those in the executable in order to let the instrumented 274// dynamic libraries access the symbol even if it is not used by the executable 275// itself. This should help if the build system is removing dead code at link 276// time. 277static NOINLINE void force_interface_symbols() { 278 volatile int fake_condition = 0; // prevent dead condition elimination. 279 // __asan_report_* functions are noreturn, so we need a switch to prevent 280 // the compiler from removing any of them. 281 switch (fake_condition) { 282 case 1: __asan_report_load1(0); break; 283 case 2: __asan_report_load2(0); break; 284 case 3: __asan_report_load4(0); break; 285 case 4: __asan_report_load8(0); break; 286 case 5: __asan_report_load16(0); break; 287 case 6: __asan_report_store1(0); break; 288 case 7: __asan_report_store2(0); break; 289 case 8: __asan_report_store4(0); break; 290 case 9: __asan_report_store8(0); break; 291 case 10: __asan_report_store16(0); break; 292 case 12: __asan_register_globals(0, 0); break; 293 case 13: __asan_unregister_globals(0, 0); break; 294 case 14: __asan_set_death_callback(0); break; 295 case 15: __asan_set_error_report_callback(0); break; 296 case 16: __asan_handle_no_return(); break; 297 case 17: __asan_address_is_poisoned(0); break; 298 case 18: __asan_get_allocated_size(0); break; 299 case 19: __asan_get_current_allocated_bytes(); break; 300 case 20: __asan_get_estimated_allocated_size(0); break; 301 case 21: __asan_get_free_bytes(); break; 302 case 22: __asan_get_heap_size(); break; 303 case 23: __asan_get_ownership(0); break; 304 case 24: __asan_get_unmapped_bytes(); break; 305 case 25: __asan_poison_memory_region(0, 0); break; 306 case 26: __asan_unpoison_memory_region(0, 0); break; 307 case 27: __asan_set_error_exit_code(0); break; 308 case 28: __asan_stack_free(0, 0, 0); break; 309 case 29: __asan_stack_malloc(0, 0); break; 310 case 30: __asan_before_dynamic_init(0); break; 311 case 31: __asan_after_dynamic_init(); break; 312 case 32: __asan_poison_stack_memory(0, 0); break; 313 case 33: __asan_unpoison_stack_memory(0, 0); break; 314 case 34: __asan_region_is_poisoned(0, 0); break; 315 case 35: __asan_describe_address(0); break; 316 } 317} 318 319static void asan_atexit() { 320 Printf("AddressSanitizer exit stats:\n"); 321 __asan_print_accumulated_stats(); 322 // Print AsanMappingProfile. 323 for (uptr i = 0; i < kAsanMappingProfileSize; i++) { 324 if (AsanMappingProfile[i] == 0) continue; 325 Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]); 326 } 327} 328 329static void InitializeHighMemEnd() { 330#if !ASAN_FIXED_MAPPING 331#if SANITIZER_WORDSIZE == 64 332# if defined(__powerpc64__) 333 // FIXME: 334 // On PowerPC64 we have two different address space layouts: 44- and 46-bit. 335 // We somehow need to figure our which one we are using now and choose 336 // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL. 337 // Note that with 'ulimit -s unlimited' the stack is moved away from the top 338 // of the address space, so simply checking the stack address is not enough. 339 kHighMemEnd = (1ULL << 44) - 1; // 0x00000fffffffffffUL 340# else 341 kHighMemEnd = (1ULL << 47) - 1; // 0x00007fffffffffffUL; 342# endif 343#else // SANITIZER_WORDSIZE == 32 344 kHighMemEnd = (1ULL << 32) - 1; // 0xffffffff; 345#endif // SANITIZER_WORDSIZE 346#endif // !ASAN_FIXED_MAPPING 347} 348 349static void ProtectGap(uptr a, uptr size) { 350 CHECK_EQ(a, (uptr)Mprotect(a, size)); 351} 352 353static void PrintAddressSpaceLayout() { 354 Printf("|| `[%p, %p]` || HighMem ||\n", 355 (void*)kHighMemBeg, (void*)kHighMemEnd); 356 Printf("|| `[%p, %p]` || HighShadow ||\n", 357 (void*)kHighShadowBeg, (void*)kHighShadowEnd); 358 if (kMidMemBeg) { 359 Printf("|| `[%p, %p]` || ShadowGap3 ||\n", 360 (void*)kShadowGap3Beg, (void*)kShadowGap3End); 361 Printf("|| `[%p, %p]` || MidMem ||\n", 362 (void*)kMidMemBeg, (void*)kMidMemEnd); 363 Printf("|| `[%p, %p]` || ShadowGap2 ||\n", 364 (void*)kShadowGap2Beg, (void*)kShadowGap2End); 365 Printf("|| `[%p, %p]` || MidShadow ||\n", 366 (void*)kMidShadowBeg, (void*)kMidShadowEnd); 367 } 368 Printf("|| `[%p, %p]` || ShadowGap ||\n", 369 (void*)kShadowGapBeg, (void*)kShadowGapEnd); 370 if (kLowShadowBeg) { 371 Printf("|| `[%p, %p]` || LowShadow ||\n", 372 (void*)kLowShadowBeg, (void*)kLowShadowEnd); 373 Printf("|| `[%p, %p]` || LowMem ||\n", 374 (void*)kLowMemBeg, (void*)kLowMemEnd); 375 } 376 Printf("MemToShadow(shadow): %p %p %p %p", 377 (void*)MEM_TO_SHADOW(kLowShadowBeg), 378 (void*)MEM_TO_SHADOW(kLowShadowEnd), 379 (void*)MEM_TO_SHADOW(kHighShadowBeg), 380 (void*)MEM_TO_SHADOW(kHighShadowEnd)); 381 if (kMidMemBeg) { 382 Printf(" %p %p", 383 (void*)MEM_TO_SHADOW(kMidShadowBeg), 384 (void*)MEM_TO_SHADOW(kMidShadowEnd)); 385 } 386 Printf("\n"); 387 Printf("red_zone=%zu\n", (uptr)flags()->redzone); 388 Printf("malloc_context_size=%zu\n", 389 (uptr)common_flags()->malloc_context_size); 390 391 Printf("SHADOW_SCALE: %zx\n", (uptr)SHADOW_SCALE); 392 Printf("SHADOW_GRANULARITY: %zx\n", (uptr)SHADOW_GRANULARITY); 393 Printf("SHADOW_OFFSET: %zx\n", (uptr)SHADOW_OFFSET); 394 CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7); 395 if (kMidMemBeg) 396 CHECK(kMidShadowBeg > kLowShadowEnd && 397 kMidMemBeg > kMidShadowEnd && 398 kHighShadowBeg > kMidMemEnd); 399} 400 401} // namespace __asan 402 403// ---------------------- Interface ---------------- {{{1 404using namespace __asan; // NOLINT 405 406#if !SANITIZER_SUPPORTS_WEAK_HOOKS 407extern "C" { 408SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE 409const char* __asan_default_options() { return ""; } 410} // extern "C" 411#endif 412 413int NOINLINE __asan_set_error_exit_code(int exit_code) { 414 int old = flags()->exitcode; 415 flags()->exitcode = exit_code; 416 return old; 417} 418 419void NOINLINE __asan_handle_no_return() { 420 int local_stack; 421 AsanThread *curr_thread = GetCurrentThread(); 422 CHECK(curr_thread); 423 uptr PageSize = GetPageSizeCached(); 424 uptr top = curr_thread->stack_top(); 425 uptr bottom = ((uptr)&local_stack - PageSize) & ~(PageSize-1); 426 static const uptr kMaxExpectedCleanupSize = 64 << 20; // 64M 427 if (top - bottom > kMaxExpectedCleanupSize) { 428 static bool reported_warning = false; 429 if (reported_warning) 430 return; 431 reported_warning = true; 432 Report("WARNING: ASan is ignoring requested __asan_handle_no_return: " 433 "stack top: %p; bottom %p; size: %p (%zd)\n" 434 "False positive error reports may follow\n" 435 "For details see " 436 "http://code.google.com/p/address-sanitizer/issues/detail?id=189\n", 437 top, bottom, top - bottom, top - bottom); 438 return; 439 } 440 PoisonShadow(bottom, top - bottom, 0); 441} 442 443void NOINLINE __asan_set_death_callback(void (*callback)(void)) { 444 death_callback = callback; 445} 446 447void __asan_init() { 448 if (asan_inited) return; 449 SanitizerToolName = "AddressSanitizer"; 450 CHECK(!asan_init_is_running && "ASan init calls itself!"); 451 asan_init_is_running = true; 452 InitializeHighMemEnd(); 453 454 // Make sure we are not statically linked. 455 AsanDoesNotSupportStaticLinkage(); 456 457 // Install tool-specific callbacks in sanitizer_common. 458 SetDieCallback(AsanDie); 459 SetCheckFailedCallback(AsanCheckFailed); 460 SetPrintfAndReportCallback(AppendToErrorMessageBuffer); 461 462 // Initialize flags. This must be done early, because most of the 463 // initialization steps look at flags(). 464 const char *options = GetEnv("ASAN_OPTIONS"); 465 InitializeFlags(flags(), options); 466 __sanitizer_set_report_path(flags()->log_path); 467 468 if (flags()->verbosity && options) { 469 Report("Parsed ASAN_OPTIONS: %s\n", options); 470 } 471 472 // Re-exec ourselves if we need to set additional env or command line args. 473 MaybeReexec(); 474 475 // Setup internal allocator callback. 476 SetLowLevelAllocateCallback(OnLowLevelAllocate); 477 478 if (flags()->atexit) { 479 Atexit(asan_atexit); 480 } 481 482 // interceptors 483 InitializeAsanInterceptors(); 484 485 ReplaceSystemMalloc(); 486 ReplaceOperatorsNewAndDelete(); 487 488 uptr shadow_start = kLowShadowBeg; 489 if (kLowShadowBeg) shadow_start -= GetMmapGranularity(); 490 uptr shadow_end = kHighShadowEnd; 491 bool full_shadow_is_available = 492 MemoryRangeIsAvailable(shadow_start, shadow_end); 493 494#if SANITIZER_LINUX && defined(__x86_64__) && !ASAN_FIXED_MAPPING 495 if (!full_shadow_is_available) { 496 kMidMemBeg = kLowMemEnd < 0x3000000000ULL ? 0x3000000000ULL : 0; 497 kMidMemEnd = kLowMemEnd < 0x3000000000ULL ? 0x4fffffffffULL : 0; 498 } 499#endif 500 501 if (flags()->verbosity) 502 PrintAddressSpaceLayout(); 503 504 if (flags()->disable_core) { 505 DisableCoreDumper(); 506 } 507 508 if (full_shadow_is_available) { 509 // mmap the low shadow plus at least one page at the left. 510 if (kLowShadowBeg) 511 ReserveShadowMemoryRange(shadow_start, kLowShadowEnd); 512 // mmap the high shadow. 513 ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd); 514 // protect the gap. 515 ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1); 516 } else if (kMidMemBeg && 517 MemoryRangeIsAvailable(shadow_start, kMidMemBeg - 1) && 518 MemoryRangeIsAvailable(kMidMemEnd + 1, shadow_end)) { 519 CHECK(kLowShadowBeg != kLowShadowEnd); 520 // mmap the low shadow plus at least one page at the left. 521 ReserveShadowMemoryRange(shadow_start, kLowShadowEnd); 522 // mmap the mid shadow. 523 ReserveShadowMemoryRange(kMidShadowBeg, kMidShadowEnd); 524 // mmap the high shadow. 525 ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd); 526 // protect the gaps. 527 ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1); 528 ProtectGap(kShadowGap2Beg, kShadowGap2End - kShadowGap2Beg + 1); 529 ProtectGap(kShadowGap3Beg, kShadowGap3End - kShadowGap3Beg + 1); 530 } else { 531 Report("Shadow memory range interleaves with an existing memory mapping. " 532 "ASan cannot proceed correctly. ABORTING.\n"); 533 DumpProcessMap(); 534 Die(); 535 } 536 537 InstallSignalHandlers(); 538 // Start symbolizer process if necessary. 539 const char* external_symbolizer = common_flags()->external_symbolizer_path; 540 if (common_flags()->symbolize && external_symbolizer && 541 external_symbolizer[0]) { 542 InitializeExternalSymbolizer(external_symbolizer); 543 } 544 545 // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited 546 // should be set to 1 prior to initializing the threads. 547 asan_inited = 1; 548 asan_init_is_running = false; 549 550 // Create main thread. 551 AsanTSDInit(AsanThread::TSDDtor); 552 AsanThread *main_thread = AsanThread::Create(0, 0); 553 CreateThreadContextArgs create_main_args = { main_thread, 0 }; 554 u32 main_tid = asanThreadRegistry().CreateThread( 555 0, true, 0, &create_main_args); 556 CHECK_EQ(0, main_tid); 557 SetCurrentThread(main_thread); 558 main_thread->ThreadStart(internal_getpid()); 559 force_interface_symbols(); // no-op. 560 561 InitializeAllocator(); 562 563#if CAN_SANITIZE_LEAKS 564 __lsan::InitCommonLsan(); 565 if (flags()->detect_leaks) { 566 Atexit(__lsan::DoLeakCheck); 567 } 568#endif 569 570 if (flags()->verbosity) { 571 Report("AddressSanitizer Init done\n"); 572 } 573} 574