asan_rtl.cc revision 9552db72ce37a9f090be4d9fecfbe75458c6d7bb
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_interface.h" 17#include "asan_internal.h" 18#include "asan_lock.h" 19#include "asan_mapping.h" 20#include "asan_stack.h" 21#include "asan_stats.h" 22#include "asan_thread.h" 23#include "asan_thread_registry.h" 24#include "sanitizer_common/sanitizer_libc.h" 25 26namespace __asan { 27using namespace __sanitizer; 28 29// -------------------------- Flags ------------------------- {{{1 30static const uptr kMallocContextSize = 30; 31 32uptr FLAG_malloc_context_size = kMallocContextSize; 33uptr FLAG_max_malloc_fill_size = 0; 34s64 FLAG_v = 0; 35uptr FLAG_redzone = (ASAN_LOW_MEMORY) ? 64 : 128; // power of two, >= 32 36uptr FLAG_quarantine_size = (ASAN_LOW_MEMORY) ? 1UL << 24 : 1UL << 28; 37static s64 FLAG_atexit = 0; 38bool FLAG_poison_shadow = 1; 39s64 FLAG_report_globals = 1; 40bool FLAG_handle_segv = ASAN_NEEDS_SEGV; 41bool FLAG_use_sigaltstack = 0; 42bool FLAG_symbolize = 0; 43s64 FLAG_demangle = 1; 44s64 FLAG_debug = 0; 45bool FLAG_replace_cfallocator = 1; // Used on Mac only. 46bool FLAG_replace_str = 1; 47bool FLAG_replace_intrin = 1; 48bool FLAG_use_fake_stack = 1; 49s64 FLAG_exitcode = ASAN_DEFAULT_FAILURE_EXITCODE; 50bool FLAG_allow_user_poisoning = 1; 51s64 FLAG_sleep_before_dying = 0; 52bool FLAG_abort_on_error = 0; 53bool FLAG_unmap_shadow_on_exit = 0; 54bool FLAG_disable_core = __WORDSIZE == 64; 55bool FLAG_check_malloc_usable_size = 1; 56 57// -------------------------- Globals --------------------- {{{1 58int asan_inited; 59bool asan_init_is_running; 60static void (*death_callback)(void); 61static void (*error_report_callback)(const char*); 62char *error_message_buffer = 0; 63uptr error_message_buffer_pos = 0; 64uptr error_message_buffer_size = 0; 65 66// -------------------------- Misc ---------------- {{{1 67void ShowStatsAndAbort() { 68 __asan_print_accumulated_stats(); 69 AsanDie(); 70} 71 72static void PrintBytes(const char *before, uptr *a) { 73 u8 *bytes = (u8*)a; 74 uptr byte_num = (__WORDSIZE) / 8; 75 Printf("%s%p:", before, (void*)a); 76 for (uptr i = 0; i < byte_num; i++) { 77 Printf(" %x%x", bytes[i] >> 4, bytes[i] & 15); 78 } 79 Printf("\n"); 80} 81 82uptr ReadFileToBuffer(const char *file_name, char **buff, 83 uptr *buff_size, uptr max_len) { 84 const uptr kMinFileLen = kPageSize; 85 uptr read_len = 0; 86 *buff = 0; 87 *buff_size = 0; 88 // The files we usually open are not seekable, so try different buffer sizes. 89 for (uptr size = kMinFileLen; size <= max_len; size *= 2) { 90 fd_t fd = internal_open(file_name, /*write*/ false); 91 if (fd < 0) return 0; 92 AsanUnmapOrDie(*buff, *buff_size); 93 *buff = (char*)AsanMmapSomewhereOrDie(size, __FUNCTION__); 94 *buff_size = size; 95 // Read up to one page at a time. 96 read_len = 0; 97 bool reached_eof = false; 98 while (read_len + kPageSize <= size) { 99 uptr just_read = AsanRead(fd, *buff + read_len, kPageSize); 100 if (just_read == 0) { 101 reached_eof = true; 102 break; 103 } 104 read_len += just_read; 105 } 106 AsanClose(fd); 107 if (reached_eof) // We've read the whole file. 108 break; 109 } 110 return read_len; 111} 112 113void AsanDie() { 114 static int num_calls = 0; 115 if (AtomicInc(&num_calls) > 1) { 116 // Don't die twice - run a busy loop. 117 while (1) { } 118 } 119 if (FLAG_sleep_before_dying) { 120 Report("Sleeping for %d second(s)\n", FLAG_sleep_before_dying); 121 SleepForSeconds(FLAG_sleep_before_dying); 122 } 123 if (FLAG_unmap_shadow_on_exit) 124 AsanUnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg); 125 if (death_callback) 126 death_callback(); 127 if (FLAG_abort_on_error) 128 Abort(); 129 Exit(FLAG_exitcode); 130} 131 132// ---------------------- mmap -------------------- {{{1 133void OutOfMemoryMessageAndDie(const char *mem_type, uptr size) { 134 Report("ERROR: AddressSanitizer failed to allocate " 135 "0x%zx (%zd) bytes of %s\n", 136 size, size, mem_type); 137 PRINT_CURRENT_STACK(); 138 ShowStatsAndAbort(); 139} 140 141// Reserve memory range [beg, end]. 142static void ReserveShadowMemoryRange(uptr beg, uptr end) { 143 CHECK((beg % kPageSize) == 0); 144 CHECK(((end + 1) % kPageSize) == 0); 145 uptr size = end - beg + 1; 146 void *res = AsanMmapFixedNoReserve(beg, size); 147 CHECK(res == (void*)beg && "ReserveShadowMemoryRange failed"); 148} 149 150// ---------------------- LowLevelAllocator ------------- {{{1 151void *LowLevelAllocator::Allocate(uptr size) { 152 CHECK((size & (size - 1)) == 0 && "size must be a power of two"); 153 if (allocated_end_ - allocated_current_ < size) { 154 uptr size_to_allocate = Max(size, kPageSize); 155 allocated_current_ = 156 (char*)AsanMmapSomewhereOrDie(size_to_allocate, __FUNCTION__); 157 allocated_end_ = allocated_current_ + size_to_allocate; 158 PoisonShadow((uptr)allocated_current_, size_to_allocate, 159 kAsanInternalHeapMagic); 160 } 161 CHECK(allocated_end_ - allocated_current_ >= size); 162 void *res = allocated_current_; 163 allocated_current_ += size; 164 return res; 165} 166 167// ---------------------- DescribeAddress -------------------- {{{1 168static bool DescribeStackAddress(uptr addr, uptr access_size) { 169 AsanThread *t = asanThreadRegistry().FindThreadByStackAddress(addr); 170 if (!t) return false; 171 const sptr kBufSize = 4095; 172 char buf[kBufSize]; 173 uptr offset = 0; 174 const char *frame_descr = t->GetFrameNameByAddr(addr, &offset); 175 // This string is created by the compiler and has the following form: 176 // "FunctioName n alloc_1 alloc_2 ... alloc_n" 177 // where alloc_i looks like "offset size len ObjectName ". 178 CHECK(frame_descr); 179 // Report the function name and the offset. 180 const char *name_end = internal_strchr(frame_descr, ' '); 181 CHECK(name_end); 182 buf[0] = 0; 183 internal_strncat(buf, frame_descr, 184 Min(kBufSize, 185 static_cast<sptr>(name_end - frame_descr))); 186 Printf("Address %p is located at offset %zu " 187 "in frame <%s> of T%d's stack:\n", 188 addr, offset, buf, t->tid()); 189 // Report the number of stack objects. 190 char *p; 191 uptr n_objects = internal_simple_strtoll(name_end, &p, 10); 192 CHECK(n_objects > 0); 193 Printf(" This frame has %zu object(s):\n", n_objects); 194 // Report all objects in this frame. 195 for (uptr i = 0; i < n_objects; i++) { 196 uptr beg, size; 197 sptr len; 198 beg = internal_simple_strtoll(p, &p, 10); 199 size = internal_simple_strtoll(p, &p, 10); 200 len = internal_simple_strtoll(p, &p, 10); 201 if (beg <= 0 || size <= 0 || len < 0 || *p != ' ') { 202 Printf("AddressSanitizer can't parse the stack frame descriptor: |%s|\n", 203 frame_descr); 204 break; 205 } 206 p++; 207 buf[0] = 0; 208 internal_strncat(buf, p, Min(kBufSize, len)); 209 p += len; 210 Printf(" [%zu, %zu) '%s'\n", beg, beg + size, buf); 211 } 212 Printf("HINT: this may be a false positive if your program uses " 213 "some custom stack unwind mechanism\n" 214 " (longjmp and C++ exceptions *are* supported)\n"); 215 t->summary()->Announce(); 216 return true; 217} 218 219static NOINLINE void DescribeAddress(uptr addr, uptr access_size) { 220 // Check if this is a global. 221 if (DescribeAddrIfGlobal(addr)) 222 return; 223 224 if (DescribeStackAddress(addr, access_size)) 225 return; 226 227 // finally, check if this is a heap. 228 DescribeHeapAddress(addr, access_size); 229} 230 231// -------------------------- Run-time entry ------------------- {{{1 232// exported functions 233#define ASAN_REPORT_ERROR(type, is_write, size) \ 234extern "C" NOINLINE ASAN_INTERFACE_ATTRIBUTE \ 235void __asan_report_ ## type ## size(uptr addr); \ 236void __asan_report_ ## type ## size(uptr addr) { \ 237 GET_CALLER_PC_BP_SP; \ 238 __asan_report_error(pc, bp, sp, addr, is_write, size); \ 239} 240 241ASAN_REPORT_ERROR(load, false, 1) 242ASAN_REPORT_ERROR(load, false, 2) 243ASAN_REPORT_ERROR(load, false, 4) 244ASAN_REPORT_ERROR(load, false, 8) 245ASAN_REPORT_ERROR(load, false, 16) 246ASAN_REPORT_ERROR(store, true, 1) 247ASAN_REPORT_ERROR(store, true, 2) 248ASAN_REPORT_ERROR(store, true, 4) 249ASAN_REPORT_ERROR(store, true, 8) 250ASAN_REPORT_ERROR(store, true, 16) 251 252// Force the linker to keep the symbols for various ASan interface functions. 253// We want to keep those in the executable in order to let the instrumented 254// dynamic libraries access the symbol even if it is not used by the executable 255// itself. This should help if the build system is removing dead code at link 256// time. 257static NOINLINE void force_interface_symbols() { 258 volatile int fake_condition = 0; // prevent dead condition elimination. 259 if (fake_condition) { 260 __asan_report_load1(0); 261 __asan_report_load2(0); 262 __asan_report_load4(0); 263 __asan_report_load8(0); 264 __asan_report_load16(0); 265 __asan_report_store1(0); 266 __asan_report_store2(0); 267 __asan_report_store4(0); 268 __asan_report_store8(0); 269 __asan_report_store16(0); 270 __asan_register_global(0, 0, 0); 271 __asan_register_globals(0, 0); 272 __asan_unregister_globals(0, 0); 273 __asan_set_death_callback(0); 274 __asan_set_error_report_callback(0); 275 __asan_handle_no_return(); 276 } 277} 278 279// -------------------------- Init ------------------- {{{1 280static void IntFlagValue(const char *flags, const char *flag, 281 s64 *out_val) { 282 if (!flags) return; 283 const char *str = internal_strstr(flags, flag); 284 if (!str) return; 285 *out_val = internal_atoll(str + internal_strlen(flag)); 286} 287 288static void BoolFlagValue(const char *flags, const char *flag, 289 bool *out_val) { 290 if (!flags) return; 291 const char *str = internal_strstr(flags, flag); 292 if (!str) return; 293 const char *suffix = str + internal_strlen(flag); 294 if (!internal_atoll(str + internal_strlen(flag))) { 295 if (suffix[0] == '0') { 296 *out_val = false; 297 return; 298 } 299 } else { 300 *out_val = true; 301 return; 302 } 303 switch (suffix[0]) { 304 case 'y': 305 case 't': { 306 *out_val = true; 307 break; 308 } 309 case 'n': 310 case 'f': { 311 *out_val = false; 312 break; 313 } 314 default: return; 315 } 316} 317 318static void asan_atexit() { 319 Printf("AddressSanitizer exit stats:\n"); 320 __asan_print_accumulated_stats(); 321} 322 323void CheckFailed(const char *cond, const char *file, int line) { 324 Report("CHECK failed: %s at %s:%d\n", cond, file, line); 325 PRINT_CURRENT_STACK(); 326 ShowStatsAndAbort(); 327} 328 329} // namespace __asan 330 331// ---------------------- Interface ---------------- {{{1 332using namespace __asan; // NOLINT 333 334int __asan_set_error_exit_code(int exit_code) { 335 int old = FLAG_exitcode; 336 FLAG_exitcode = exit_code; 337 return old; 338} 339 340void NOINLINE __asan_handle_no_return() { 341 int local_stack; 342 AsanThread *curr_thread = asanThreadRegistry().GetCurrent(); 343 CHECK(curr_thread); 344 uptr top = curr_thread->stack_top(); 345 uptr bottom = ((uptr)&local_stack - kPageSize) & ~(kPageSize-1); 346 PoisonShadow(bottom, top - bottom, 0); 347} 348 349void NOINLINE __asan_set_death_callback(void (*callback)(void)) { 350 death_callback = callback; 351} 352 353void NOINLINE __asan_set_error_report_callback(void (*callback)(const char*)) { 354 error_report_callback = callback; 355 if (callback) { 356 error_message_buffer_size = 1 << 16; 357 error_message_buffer = 358 (char*)AsanMmapSomewhereOrDie(error_message_buffer_size, __FUNCTION__); 359 error_message_buffer_pos = 0; 360 } 361} 362 363void __asan_report_error(uptr pc, uptr bp, uptr sp, 364 uptr addr, bool is_write, uptr access_size) { 365 // Do not print more than one report, otherwise they will mix up. 366 static int num_calls = 0; 367 if (AtomicInc(&num_calls) > 1) return; 368 369 Printf("=================================================================\n"); 370 const char *bug_descr = "unknown-crash"; 371 if (AddrIsInMem(addr)) { 372 u8 *shadow_addr = (u8*)MemToShadow(addr); 373 // If we are accessing 16 bytes, look at the second shadow byte. 374 if (*shadow_addr == 0 && access_size > SHADOW_GRANULARITY) 375 shadow_addr++; 376 // If we are in the partial right redzone, look at the next shadow byte. 377 if (*shadow_addr > 0 && *shadow_addr < 128) 378 shadow_addr++; 379 switch (*shadow_addr) { 380 case kAsanHeapLeftRedzoneMagic: 381 case kAsanHeapRightRedzoneMagic: 382 bug_descr = "heap-buffer-overflow"; 383 break; 384 case kAsanHeapFreeMagic: 385 bug_descr = "heap-use-after-free"; 386 break; 387 case kAsanStackLeftRedzoneMagic: 388 bug_descr = "stack-buffer-underflow"; 389 break; 390 case kAsanStackMidRedzoneMagic: 391 case kAsanStackRightRedzoneMagic: 392 case kAsanStackPartialRedzoneMagic: 393 bug_descr = "stack-buffer-overflow"; 394 break; 395 case kAsanStackAfterReturnMagic: 396 bug_descr = "stack-use-after-return"; 397 break; 398 case kAsanUserPoisonedMemoryMagic: 399 bug_descr = "use-after-poison"; 400 break; 401 case kAsanGlobalRedzoneMagic: 402 bug_descr = "global-buffer-overflow"; 403 break; 404 } 405 } 406 407 AsanThread *curr_thread = asanThreadRegistry().GetCurrent(); 408 int curr_tid = asanThreadRegistry().GetCurrentTidOrMinusOne(); 409 410 if (curr_thread) { 411 // We started reporting an error message. Stop using the fake stack 412 // in case we will call an instrumented function from a symbolizer. 413 curr_thread->fake_stack().StopUsingFakeStack(); 414 } 415 416 Report("ERROR: AddressSanitizer %s on address " 417 "%p at pc 0x%zx bp 0x%zx sp 0x%zx\n", 418 bug_descr, addr, pc, bp, sp); 419 420 Printf("%s of size %zu at %p thread T%d\n", 421 access_size ? (is_write ? "WRITE" : "READ") : "ACCESS", 422 access_size, addr, curr_tid); 423 424 if (FLAG_debug) { 425 PrintBytes("PC: ", (uptr*)pc); 426 } 427 428 GET_STACK_TRACE_WITH_PC_AND_BP(kStackTraceMax, pc, bp); 429 stack.PrintStack(); 430 431 CHECK(AddrIsInMem(addr)); 432 433 DescribeAddress(addr, access_size); 434 435 uptr shadow_addr = MemToShadow(addr); 436 Report("ABORTING\n"); 437 __asan_print_accumulated_stats(); 438 Printf("Shadow byte and word:\n"); 439 Printf(" %p: %x\n", shadow_addr, *(unsigned char*)shadow_addr); 440 uptr aligned_shadow = shadow_addr & ~(kWordSize - 1); 441 PrintBytes(" ", (uptr*)(aligned_shadow)); 442 Printf("More shadow bytes:\n"); 443 PrintBytes(" ", (uptr*)(aligned_shadow-4*kWordSize)); 444 PrintBytes(" ", (uptr*)(aligned_shadow-3*kWordSize)); 445 PrintBytes(" ", (uptr*)(aligned_shadow-2*kWordSize)); 446 PrintBytes(" ", (uptr*)(aligned_shadow-1*kWordSize)); 447 PrintBytes("=>", (uptr*)(aligned_shadow+0*kWordSize)); 448 PrintBytes(" ", (uptr*)(aligned_shadow+1*kWordSize)); 449 PrintBytes(" ", (uptr*)(aligned_shadow+2*kWordSize)); 450 PrintBytes(" ", (uptr*)(aligned_shadow+3*kWordSize)); 451 PrintBytes(" ", (uptr*)(aligned_shadow+4*kWordSize)); 452 if (error_report_callback) { 453 error_report_callback(error_message_buffer); 454 } 455 AsanDie(); 456} 457 458static void ParseAsanOptions(const char *options) { 459 IntFlagValue(options, "malloc_context_size=", 460 (s64*)&FLAG_malloc_context_size); 461 CHECK(FLAG_malloc_context_size <= kMallocContextSize); 462 463 IntFlagValue(options, "max_malloc_fill_size=", 464 (s64*)&FLAG_max_malloc_fill_size); 465 466 IntFlagValue(options, "verbosity=", &FLAG_v); 467 468 IntFlagValue(options, "redzone=", (s64*)&FLAG_redzone); 469 CHECK(FLAG_redzone >= 32); 470 CHECK((FLAG_redzone & (FLAG_redzone - 1)) == 0); 471 IntFlagValue(options, "quarantine_size=", (s64*)&FLAG_quarantine_size); 472 473 IntFlagValue(options, "atexit=", &FLAG_atexit); 474 BoolFlagValue(options, "poison_shadow=", &FLAG_poison_shadow); 475 IntFlagValue(options, "report_globals=", &FLAG_report_globals); 476 BoolFlagValue(options, "handle_segv=", &FLAG_handle_segv); 477 BoolFlagValue(options, "use_sigaltstack=", &FLAG_use_sigaltstack); 478 BoolFlagValue(options, "symbolize=", &FLAG_symbolize); 479 IntFlagValue(options, "demangle=", &FLAG_demangle); 480 IntFlagValue(options, "debug=", &FLAG_debug); 481 BoolFlagValue(options, "replace_cfallocator=", &FLAG_replace_cfallocator); 482 BoolFlagValue(options, "replace_str=", &FLAG_replace_str); 483 BoolFlagValue(options, "replace_intrin=", &FLAG_replace_intrin); 484 BoolFlagValue(options, "use_fake_stack=", &FLAG_use_fake_stack); 485 IntFlagValue(options, "exitcode=", &FLAG_exitcode); 486 BoolFlagValue(options, "allow_user_poisoning=", &FLAG_allow_user_poisoning); 487 IntFlagValue(options, "sleep_before_dying=", &FLAG_sleep_before_dying); 488 BoolFlagValue(options, "abort_on_error=", &FLAG_abort_on_error); 489 BoolFlagValue(options, "unmap_shadow_on_exit=", &FLAG_unmap_shadow_on_exit); 490 // By default, disable core dumper on 64-bit -- 491 // it makes little sense to dump 16T+ core. 492 BoolFlagValue(options, "disable_core=", &FLAG_disable_core); 493 494 // Allow the users to work around the bug in Nvidia drivers prior to 295.*. 495 BoolFlagValue(options, "check_malloc_usable_size=", 496 &FLAG_check_malloc_usable_size); 497} 498 499void __asan_init() { 500 if (asan_inited) return; 501 MiniLibcStub(); // FIXME: remove me once mini libc build is tested properly. 502 asan_init_is_running = true; 503 504 // Make sure we are not statically linked. 505 AsanDoesNotSupportStaticLinkage(); 506 507#if !defined(_WIN32) 508 if (__asan_default_options) { 509 ParseAsanOptions(__asan_default_options); 510 if (FLAG_v) { 511 Report("Using the defaults from __asan_default_options: %s\n", 512 __asan_default_options); 513 } 514 } 515#endif 516 // flags 517 const char *options = AsanGetEnv("ASAN_OPTIONS"); 518 ParseAsanOptions(options); 519 520 if (FLAG_v && options) { 521 Report("Parsed ASAN_OPTIONS: %s\n", options); 522 } 523 524 if (FLAG_atexit) { 525 Atexit(asan_atexit); 526 } 527 528 // interceptors 529 InitializeAsanInterceptors(); 530 531 ReplaceSystemMalloc(); 532 ReplaceOperatorsNewAndDelete(); 533 534 if (FLAG_v) { 535 Printf("|| `[%p, %p]` || HighMem ||\n", kHighMemBeg, kHighMemEnd); 536 Printf("|| `[%p, %p]` || HighShadow ||\n", 537 kHighShadowBeg, kHighShadowEnd); 538 Printf("|| `[%p, %p]` || ShadowGap ||\n", 539 kShadowGapBeg, kShadowGapEnd); 540 Printf("|| `[%p, %p]` || LowShadow ||\n", 541 kLowShadowBeg, kLowShadowEnd); 542 Printf("|| `[%p, %p]` || LowMem ||\n", kLowMemBeg, kLowMemEnd); 543 Printf("MemToShadow(shadow): %p %p %p %p\n", 544 MEM_TO_SHADOW(kLowShadowBeg), 545 MEM_TO_SHADOW(kLowShadowEnd), 546 MEM_TO_SHADOW(kHighShadowBeg), 547 MEM_TO_SHADOW(kHighShadowEnd)); 548 Printf("red_zone=%zu\n", (uptr)FLAG_redzone); 549 Printf("malloc_context_size=%zu\n", (uptr)FLAG_malloc_context_size); 550 551 Printf("SHADOW_SCALE: %zx\n", (uptr)SHADOW_SCALE); 552 Printf("SHADOW_GRANULARITY: %zx\n", (uptr)SHADOW_GRANULARITY); 553 Printf("SHADOW_OFFSET: %zx\n", (uptr)SHADOW_OFFSET); 554 CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7); 555 } 556 557 if (FLAG_disable_core) { 558 AsanDisableCoreDumper(); 559 } 560 561 if (AsanShadowRangeIsAvailable()) { 562 if (kLowShadowBeg != kLowShadowEnd) { 563 // mmap the low shadow plus at least one page. 564 ReserveShadowMemoryRange(kLowShadowBeg - kMmapGranularity, kLowShadowEnd); 565 } 566 // mmap the high shadow. 567 ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd); 568 // protect the gap 569 void *prot = AsanMprotect(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1); 570 CHECK(prot == (void*)kShadowGapBeg); 571 } else { 572 Report("Shadow memory range interleaves with an existing memory mapping. " 573 "ASan cannot proceed correctly. ABORTING.\n"); 574 AsanDumpProcessMap(); 575 AsanDie(); 576 } 577 578 InstallSignalHandlers(); 579 580 // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited 581 // should be set to 1 prior to initializing the threads. 582 asan_inited = 1; 583 asan_init_is_running = false; 584 585 asanThreadRegistry().Init(); 586 asanThreadRegistry().GetMain()->ThreadStart(); 587 force_interface_symbols(); // no-op. 588 589 if (FLAG_v) { 590 Report("AddressSanitizer Init done\n"); 591 } 592} 593 594#if defined(ASAN_USE_PREINIT_ARRAY) 595 // On Linux, we force __asan_init to be called before anyone else 596 // by placing it into .preinit_array section. 597 // FIXME: do we have anything like this on Mac? 598 __attribute__((section(".preinit_array"))) 599 typeof(__asan_init) *__asan_preinit =__asan_init; 600#elif defined(_WIN32) && defined(_DLL) 601 // On Windows, when using dynamic CRT (/MD), we can put a pointer 602 // to __asan_init into the global list of C initializers. 603 // See crt0dat.c in the CRT sources for the details. 604 #pragma section(".CRT$XIB", long, read) // NOLINT 605 __declspec(allocate(".CRT$XIB")) void (*__asan_preinit)() = __asan_init; 606#endif 607