asan_rtl.cc revision 5bcca4e33ececdddd8e9e07619c129e870492251
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 __sanitizer { 27using namespace __asan; 28 29void Die() { 30 static int num_calls = 0; 31 if (AtomicInc(&num_calls) > 1) { 32 // Don't die twice - run a busy loop. 33 while (1) { } 34 } 35 if (FLAG_sleep_before_dying) { 36 Report("Sleeping for %zd second(s)\n", FLAG_sleep_before_dying); 37 SleepForSeconds(FLAG_sleep_before_dying); 38 } 39 if (FLAG_unmap_shadow_on_exit) 40 AsanUnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg); 41 if (death_callback) 42 death_callback(); 43 if (FLAG_abort_on_error) 44 Abort(); 45 Exit(FLAG_exitcode); 46} 47 48} // namespace __sanitizer 49 50namespace __asan { 51 52// -------------------------- Flags ------------------------- {{{1 53static const uptr kMallocContextSize = 30; 54 55uptr FLAG_malloc_context_size = kMallocContextSize; 56uptr FLAG_max_malloc_fill_size = 0; 57s64 FLAG_v = 0; 58uptr FLAG_redzone = (ASAN_LOW_MEMORY) ? 64 : 128; // power of two, >= 32 59uptr FLAG_quarantine_size = (ASAN_LOW_MEMORY) ? 1UL << 24 : 1UL << 28; 60static s64 FLAG_atexit = 0; 61bool FLAG_poison_shadow = 1; 62s64 FLAG_report_globals = 1; 63bool FLAG_handle_segv = ASAN_NEEDS_SEGV; 64bool FLAG_use_sigaltstack = 0; 65bool FLAG_symbolize = 0; 66s64 FLAG_demangle = 1; 67s64 FLAG_debug = 0; 68bool FLAG_replace_cfallocator = 1; // Used on Mac only. 69bool FLAG_replace_str = 1; 70bool FLAG_replace_intrin = 1; 71bool FLAG_use_fake_stack = 1; 72s64 FLAG_exitcode = ASAN_DEFAULT_FAILURE_EXITCODE; 73bool FLAG_allow_user_poisoning = 1; 74s64 FLAG_sleep_before_dying = 0; 75bool FLAG_abort_on_error = 0; 76bool FLAG_unmap_shadow_on_exit = 0; 77bool FLAG_disable_core = __WORDSIZE == 64; 78bool FLAG_check_malloc_usable_size = 1; 79 80// -------------------------- Globals --------------------- {{{1 81int asan_inited; 82bool asan_init_is_running; 83void (*death_callback)(void); 84static void (*error_report_callback)(const char*); 85char *error_message_buffer = 0; 86uptr error_message_buffer_pos = 0; 87uptr error_message_buffer_size = 0; 88 89// -------------------------- Misc ---------------- {{{1 90void ShowStatsAndAbort() { 91 __asan_print_accumulated_stats(); 92 Die(); 93} 94 95static void PrintBytes(const char *before, uptr *a) { 96 u8 *bytes = (u8*)a; 97 uptr byte_num = (__WORDSIZE) / 8; 98 Printf("%s%p:", before, (void*)a); 99 for (uptr i = 0; i < byte_num; i++) { 100 Printf(" %x%x", bytes[i] >> 4, bytes[i] & 15); 101 } 102 Printf("\n"); 103} 104 105uptr ReadFileToBuffer(const char *file_name, char **buff, 106 uptr *buff_size, uptr max_len) { 107 const uptr kMinFileLen = kPageSize; 108 uptr read_len = 0; 109 *buff = 0; 110 *buff_size = 0; 111 // The files we usually open are not seekable, so try different buffer sizes. 112 for (uptr size = kMinFileLen; size <= max_len; size *= 2) { 113 fd_t fd = internal_open(file_name, /*write*/ false); 114 if (fd < 0) return 0; 115 AsanUnmapOrDie(*buff, *buff_size); 116 *buff = (char*)AsanMmapSomewhereOrDie(size, __FUNCTION__); 117 *buff_size = size; 118 // Read up to one page at a time. 119 read_len = 0; 120 bool reached_eof = false; 121 while (read_len + kPageSize <= size) { 122 uptr just_read = internal_read(fd, *buff + read_len, kPageSize); 123 if (just_read == 0) { 124 reached_eof = true; 125 break; 126 } 127 read_len += just_read; 128 } 129 internal_close(fd); 130 if (reached_eof) // We've read the whole file. 131 break; 132 } 133 return read_len; 134} 135 136// ---------------------- mmap -------------------- {{{1 137void OutOfMemoryMessageAndDie(const char *mem_type, uptr size) { 138 Report("ERROR: AddressSanitizer failed to allocate " 139 "0x%zx (%zd) bytes of %s\n", 140 size, size, mem_type); 141 PRINT_CURRENT_STACK(); 142 ShowStatsAndAbort(); 143} 144 145// Reserve memory range [beg, end]. 146static void ReserveShadowMemoryRange(uptr beg, uptr end) { 147 CHECK((beg % kPageSize) == 0); 148 CHECK(((end + 1) % kPageSize) == 0); 149 uptr size = end - beg + 1; 150 void *res = AsanMmapFixedNoReserve(beg, size); 151 CHECK(res == (void*)beg && "ReserveShadowMemoryRange failed"); 152} 153 154// ---------------------- LowLevelAllocator ------------- {{{1 155void *LowLevelAllocator::Allocate(uptr size) { 156 CHECK((size & (size - 1)) == 0 && "size must be a power of two"); 157 if (allocated_end_ - allocated_current_ < size) { 158 uptr size_to_allocate = Max(size, kPageSize); 159 allocated_current_ = 160 (char*)AsanMmapSomewhereOrDie(size_to_allocate, __FUNCTION__); 161 allocated_end_ = allocated_current_ + size_to_allocate; 162 PoisonShadow((uptr)allocated_current_, size_to_allocate, 163 kAsanInternalHeapMagic); 164 } 165 CHECK(allocated_end_ - allocated_current_ >= size); 166 void *res = allocated_current_; 167 allocated_current_ += size; 168 return res; 169} 170 171// ---------------------- DescribeAddress -------------------- {{{1 172static bool DescribeStackAddress(uptr addr, uptr access_size) { 173 AsanThread *t = asanThreadRegistry().FindThreadByStackAddress(addr); 174 if (!t) return false; 175 const sptr kBufSize = 4095; 176 char buf[kBufSize]; 177 uptr offset = 0; 178 const char *frame_descr = t->GetFrameNameByAddr(addr, &offset); 179 // This string is created by the compiler and has the following form: 180 // "FunctioName n alloc_1 alloc_2 ... alloc_n" 181 // where alloc_i looks like "offset size len ObjectName ". 182 CHECK(frame_descr); 183 // Report the function name and the offset. 184 const char *name_end = internal_strchr(frame_descr, ' '); 185 CHECK(name_end); 186 buf[0] = 0; 187 internal_strncat(buf, frame_descr, 188 Min(kBufSize, 189 static_cast<sptr>(name_end - frame_descr))); 190 Printf("Address %p is located at offset %zu " 191 "in frame <%s> of T%d's stack:\n", 192 (void*)addr, offset, buf, t->tid()); 193 // Report the number of stack objects. 194 char *p; 195 uptr n_objects = internal_simple_strtoll(name_end, &p, 10); 196 CHECK(n_objects > 0); 197 Printf(" This frame has %zu object(s):\n", n_objects); 198 // Report all objects in this frame. 199 for (uptr i = 0; i < n_objects; i++) { 200 uptr beg, size; 201 sptr len; 202 beg = internal_simple_strtoll(p, &p, 10); 203 size = internal_simple_strtoll(p, &p, 10); 204 len = internal_simple_strtoll(p, &p, 10); 205 if (beg <= 0 || size <= 0 || len < 0 || *p != ' ') { 206 Printf("AddressSanitizer can't parse the stack frame descriptor: |%s|\n", 207 frame_descr); 208 break; 209 } 210 p++; 211 buf[0] = 0; 212 internal_strncat(buf, p, Min(kBufSize, len)); 213 p += len; 214 Printf(" [%zu, %zu) '%s'\n", beg, beg + size, buf); 215 } 216 Printf("HINT: this may be a false positive if your program uses " 217 "some custom stack unwind mechanism\n" 218 " (longjmp and C++ exceptions *are* supported)\n"); 219 t->summary()->Announce(); 220 return true; 221} 222 223static NOINLINE void DescribeAddress(uptr addr, uptr access_size) { 224 // Check if this is a global. 225 if (DescribeAddrIfGlobal(addr)) 226 return; 227 228 if (DescribeStackAddress(addr, access_size)) 229 return; 230 231 // finally, check if this is a heap. 232 DescribeHeapAddress(addr, access_size); 233} 234 235// -------------------------- Run-time entry ------------------- {{{1 236// exported functions 237#define ASAN_REPORT_ERROR(type, is_write, size) \ 238extern "C" NOINLINE INTERFACE_ATTRIBUTE \ 239void __asan_report_ ## type ## size(uptr addr); \ 240void __asan_report_ ## type ## size(uptr addr) { \ 241 GET_CALLER_PC_BP_SP; \ 242 __asan_report_error(pc, bp, sp, addr, is_write, size); \ 243} 244 245ASAN_REPORT_ERROR(load, false, 1) 246ASAN_REPORT_ERROR(load, false, 2) 247ASAN_REPORT_ERROR(load, false, 4) 248ASAN_REPORT_ERROR(load, false, 8) 249ASAN_REPORT_ERROR(load, false, 16) 250ASAN_REPORT_ERROR(store, true, 1) 251ASAN_REPORT_ERROR(store, true, 2) 252ASAN_REPORT_ERROR(store, true, 4) 253ASAN_REPORT_ERROR(store, true, 8) 254ASAN_REPORT_ERROR(store, true, 16) 255 256// Force the linker to keep the symbols for various ASan interface functions. 257// We want to keep those in the executable in order to let the instrumented 258// dynamic libraries access the symbol even if it is not used by the executable 259// itself. This should help if the build system is removing dead code at link 260// time. 261static NOINLINE void force_interface_symbols() { 262 volatile int fake_condition = 0; // prevent dead condition elimination. 263 if (fake_condition) { 264 __asan_report_load1(0); 265 __asan_report_load2(0); 266 __asan_report_load4(0); 267 __asan_report_load8(0); 268 __asan_report_load16(0); 269 __asan_report_store1(0); 270 __asan_report_store2(0); 271 __asan_report_store4(0); 272 __asan_report_store8(0); 273 __asan_report_store16(0); 274 __asan_register_global(0, 0, 0); 275 __asan_register_globals(0, 0); 276 __asan_unregister_globals(0, 0); 277 __asan_set_death_callback(0); 278 __asan_set_error_report_callback(0); 279 __asan_handle_no_return(); 280 } 281} 282 283// -------------------------- Init ------------------- {{{1 284static void IntFlagValue(const char *flags, const char *flag, 285 s64 *out_val) { 286 if (!flags) return; 287 const char *str = internal_strstr(flags, flag); 288 if (!str) return; 289 *out_val = internal_atoll(str + internal_strlen(flag)); 290} 291 292static void BoolFlagValue(const char *flags, const char *flag, 293 bool *out_val) { 294 if (!flags) return; 295 const char *str = internal_strstr(flags, flag); 296 if (!str) return; 297 const char *suffix = str + internal_strlen(flag); 298 if (!internal_atoll(str + internal_strlen(flag))) { 299 if (suffix[0] == '0') { 300 *out_val = false; 301 return; 302 } 303 } else { 304 *out_val = true; 305 return; 306 } 307 switch (suffix[0]) { 308 case 'y': 309 case 't': { 310 *out_val = true; 311 break; 312 } 313 case 'n': 314 case 'f': { 315 *out_val = false; 316 break; 317 } 318 default: return; 319 } 320} 321 322static void asan_atexit() { 323 Printf("AddressSanitizer exit stats:\n"); 324 __asan_print_accumulated_stats(); 325} 326 327void CheckFailed(const char *cond, const char *file, int line) { 328 Report("CHECK failed: %s at %s:%d\n", cond, file, line); 329 PRINT_CURRENT_STACK(); 330 ShowStatsAndAbort(); 331} 332 333} // namespace __asan 334 335// ---------------------- Interface ---------------- {{{1 336using namespace __asan; // NOLINT 337 338int __asan_set_error_exit_code(int exit_code) { 339 int old = FLAG_exitcode; 340 FLAG_exitcode = exit_code; 341 return old; 342} 343 344void NOINLINE __asan_handle_no_return() { 345 int local_stack; 346 AsanThread *curr_thread = asanThreadRegistry().GetCurrent(); 347 CHECK(curr_thread); 348 uptr top = curr_thread->stack_top(); 349 uptr bottom = ((uptr)&local_stack - kPageSize) & ~(kPageSize-1); 350 PoisonShadow(bottom, top - bottom, 0); 351} 352 353void NOINLINE __asan_set_death_callback(void (*callback)(void)) { 354 death_callback = callback; 355} 356 357void NOINLINE __asan_set_error_report_callback(void (*callback)(const char*)) { 358 error_report_callback = callback; 359 if (callback) { 360 error_message_buffer_size = 1 << 16; 361 error_message_buffer = 362 (char*)AsanMmapSomewhereOrDie(error_message_buffer_size, __FUNCTION__); 363 error_message_buffer_pos = 0; 364 } 365} 366 367void __asan_report_error(uptr pc, uptr bp, uptr sp, 368 uptr addr, bool is_write, uptr access_size) { 369 // Do not print more than one report, otherwise they will mix up. 370 static int num_calls = 0; 371 if (AtomicInc(&num_calls) > 1) return; 372 373 Printf("=================================================================\n"); 374 const char *bug_descr = "unknown-crash"; 375 if (AddrIsInMem(addr)) { 376 u8 *shadow_addr = (u8*)MemToShadow(addr); 377 // If we are accessing 16 bytes, look at the second shadow byte. 378 if (*shadow_addr == 0 && access_size > SHADOW_GRANULARITY) 379 shadow_addr++; 380 // If we are in the partial right redzone, look at the next shadow byte. 381 if (*shadow_addr > 0 && *shadow_addr < 128) 382 shadow_addr++; 383 switch (*shadow_addr) { 384 case kAsanHeapLeftRedzoneMagic: 385 case kAsanHeapRightRedzoneMagic: 386 bug_descr = "heap-buffer-overflow"; 387 break; 388 case kAsanHeapFreeMagic: 389 bug_descr = "heap-use-after-free"; 390 break; 391 case kAsanStackLeftRedzoneMagic: 392 bug_descr = "stack-buffer-underflow"; 393 break; 394 case kAsanStackMidRedzoneMagic: 395 case kAsanStackRightRedzoneMagic: 396 case kAsanStackPartialRedzoneMagic: 397 bug_descr = "stack-buffer-overflow"; 398 break; 399 case kAsanStackAfterReturnMagic: 400 bug_descr = "stack-use-after-return"; 401 break; 402 case kAsanUserPoisonedMemoryMagic: 403 bug_descr = "use-after-poison"; 404 break; 405 case kAsanGlobalRedzoneMagic: 406 bug_descr = "global-buffer-overflow"; 407 break; 408 } 409 } 410 411 AsanThread *curr_thread = asanThreadRegistry().GetCurrent(); 412 int curr_tid = asanThreadRegistry().GetCurrentTidOrMinusOne(); 413 414 if (curr_thread) { 415 // We started reporting an error message. Stop using the fake stack 416 // in case we will call an instrumented function from a symbolizer. 417 curr_thread->fake_stack().StopUsingFakeStack(); 418 } 419 420 Report("ERROR: AddressSanitizer %s on address " 421 "%p at pc 0x%zx bp 0x%zx sp 0x%zx\n", 422 bug_descr, (void*)addr, pc, bp, sp); 423 424 Printf("%s of size %zu at %p thread T%d\n", 425 access_size ? (is_write ? "WRITE" : "READ") : "ACCESS", 426 access_size, (void*)addr, curr_tid); 427 428 if (FLAG_debug) { 429 PrintBytes("PC: ", (uptr*)pc); 430 } 431 432 GET_STACK_TRACE_WITH_PC_AND_BP(kStackTraceMax, pc, bp); 433 stack.PrintStack(); 434 435 CHECK(AddrIsInMem(addr)); 436 437 DescribeAddress(addr, access_size); 438 439 uptr shadow_addr = MemToShadow(addr); 440 Report("ABORTING\n"); 441 __asan_print_accumulated_stats(); 442 Printf("Shadow byte and word:\n"); 443 Printf(" %p: %x\n", (void*)shadow_addr, *(unsigned char*)shadow_addr); 444 uptr aligned_shadow = shadow_addr & ~(kWordSize - 1); 445 PrintBytes(" ", (uptr*)(aligned_shadow)); 446 Printf("More shadow bytes:\n"); 447 PrintBytes(" ", (uptr*)(aligned_shadow-4*kWordSize)); 448 PrintBytes(" ", (uptr*)(aligned_shadow-3*kWordSize)); 449 PrintBytes(" ", (uptr*)(aligned_shadow-2*kWordSize)); 450 PrintBytes(" ", (uptr*)(aligned_shadow-1*kWordSize)); 451 PrintBytes("=>", (uptr*)(aligned_shadow+0*kWordSize)); 452 PrintBytes(" ", (uptr*)(aligned_shadow+1*kWordSize)); 453 PrintBytes(" ", (uptr*)(aligned_shadow+2*kWordSize)); 454 PrintBytes(" ", (uptr*)(aligned_shadow+3*kWordSize)); 455 PrintBytes(" ", (uptr*)(aligned_shadow+4*kWordSize)); 456 if (error_report_callback) { 457 error_report_callback(error_message_buffer); 458 } 459 Die(); 460} 461 462static void ParseAsanOptions(const char *options) { 463 IntFlagValue(options, "malloc_context_size=", 464 (s64*)&FLAG_malloc_context_size); 465 CHECK(FLAG_malloc_context_size <= kMallocContextSize); 466 467 IntFlagValue(options, "max_malloc_fill_size=", 468 (s64*)&FLAG_max_malloc_fill_size); 469 470 IntFlagValue(options, "verbosity=", &FLAG_v); 471 472 IntFlagValue(options, "redzone=", (s64*)&FLAG_redzone); 473 CHECK(FLAG_redzone >= 32); 474 CHECK((FLAG_redzone & (FLAG_redzone - 1)) == 0); 475 IntFlagValue(options, "quarantine_size=", (s64*)&FLAG_quarantine_size); 476 477 IntFlagValue(options, "atexit=", &FLAG_atexit); 478 BoolFlagValue(options, "poison_shadow=", &FLAG_poison_shadow); 479 IntFlagValue(options, "report_globals=", &FLAG_report_globals); 480 BoolFlagValue(options, "handle_segv=", &FLAG_handle_segv); 481 BoolFlagValue(options, "use_sigaltstack=", &FLAG_use_sigaltstack); 482 BoolFlagValue(options, "symbolize=", &FLAG_symbolize); 483 IntFlagValue(options, "demangle=", &FLAG_demangle); 484 IntFlagValue(options, "debug=", &FLAG_debug); 485 BoolFlagValue(options, "replace_cfallocator=", &FLAG_replace_cfallocator); 486 BoolFlagValue(options, "replace_str=", &FLAG_replace_str); 487 BoolFlagValue(options, "replace_intrin=", &FLAG_replace_intrin); 488 BoolFlagValue(options, "use_fake_stack=", &FLAG_use_fake_stack); 489 IntFlagValue(options, "exitcode=", &FLAG_exitcode); 490 BoolFlagValue(options, "allow_user_poisoning=", &FLAG_allow_user_poisoning); 491 IntFlagValue(options, "sleep_before_dying=", &FLAG_sleep_before_dying); 492 BoolFlagValue(options, "abort_on_error=", &FLAG_abort_on_error); 493 BoolFlagValue(options, "unmap_shadow_on_exit=", &FLAG_unmap_shadow_on_exit); 494 // By default, disable core dumper on 64-bit -- 495 // it makes little sense to dump 16T+ core. 496 BoolFlagValue(options, "disable_core=", &FLAG_disable_core); 497 498 // Allow the users to work around the bug in Nvidia drivers prior to 295.*. 499 BoolFlagValue(options, "check_malloc_usable_size=", 500 &FLAG_check_malloc_usable_size); 501} 502 503void __asan_init() { 504 if (asan_inited) return; 505 MiniLibcStub(); // FIXME: remove me once mini libc build is tested properly. 506 asan_init_is_running = true; 507 508 // Make sure we are not statically linked. 509 AsanDoesNotSupportStaticLinkage(); 510 511#if !defined(_WIN32) 512 if (__asan_default_options) { 513 ParseAsanOptions(__asan_default_options); 514 if (FLAG_v) { 515 Report("Using the defaults from __asan_default_options: %s\n", 516 __asan_default_options); 517 } 518 } 519#endif 520 // flags 521 const char *options = AsanGetEnv("ASAN_OPTIONS"); 522 ParseAsanOptions(options); 523 524 if (FLAG_v && options) { 525 Report("Parsed ASAN_OPTIONS: %s\n", options); 526 } 527 528 if (FLAG_atexit) { 529 Atexit(asan_atexit); 530 } 531 532 // interceptors 533 InitializeAsanInterceptors(); 534 535 ReplaceSystemMalloc(); 536 ReplaceOperatorsNewAndDelete(); 537 538 if (FLAG_v) { 539 Printf("|| `[%zx, %zx]` || HighMem ||\n", kHighMemBeg, kHighMemEnd); 540 Printf("|| `[%zx, %zx]` || HighShadow ||\n", 541 kHighShadowBeg, kHighShadowEnd); 542 Printf("|| `[%zx, %zx]` || ShadowGap ||\n", 543 kShadowGapBeg, kShadowGapEnd); 544 Printf("|| `[%zx, %zx]` || LowShadow ||\n", 545 kLowShadowBeg, kLowShadowEnd); 546 Printf("|| `[%zx, %zx]` || LowMem ||\n", kLowMemBeg, kLowMemEnd); 547 Printf("MemToShadow(shadow): %p %p %p %p\n", 548 MEM_TO_SHADOW(kLowShadowBeg), 549 MEM_TO_SHADOW(kLowShadowEnd), 550 MEM_TO_SHADOW(kHighShadowBeg), 551 MEM_TO_SHADOW(kHighShadowEnd)); 552 Printf("red_zone=%zu\n", (uptr)FLAG_redzone); 553 Printf("malloc_context_size=%zu\n", (uptr)FLAG_malloc_context_size); 554 555 Printf("SHADOW_SCALE: %zx\n", (uptr)SHADOW_SCALE); 556 Printf("SHADOW_GRANULARITY: %zx\n", (uptr)SHADOW_GRANULARITY); 557 Printf("SHADOW_OFFSET: %zx\n", (uptr)SHADOW_OFFSET); 558 CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7); 559 } 560 561 if (FLAG_disable_core) { 562 AsanDisableCoreDumper(); 563 } 564 565 if (AsanShadowRangeIsAvailable()) { 566 if (kLowShadowBeg != kLowShadowEnd) { 567 // mmap the low shadow plus at least one page. 568 ReserveShadowMemoryRange(kLowShadowBeg - kMmapGranularity, kLowShadowEnd); 569 } 570 // mmap the high shadow. 571 ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd); 572 // protect the gap 573 void *prot = AsanMprotect(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1); 574 CHECK(prot == (void*)kShadowGapBeg); 575 } else { 576 Report("Shadow memory range interleaves with an existing memory mapping. " 577 "ASan cannot proceed correctly. ABORTING.\n"); 578 AsanDumpProcessMap(); 579 Die(); 580 } 581 582 InstallSignalHandlers(); 583 584 // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited 585 // should be set to 1 prior to initializing the threads. 586 asan_inited = 1; 587 asan_init_is_running = false; 588 589 asanThreadRegistry().Init(); 590 asanThreadRegistry().GetMain()->ThreadStart(); 591 force_interface_symbols(); // no-op. 592 593 if (FLAG_v) { 594 Report("AddressSanitizer Init done\n"); 595 } 596} 597 598#if defined(ASAN_USE_PREINIT_ARRAY) 599 // On Linux, we force __asan_init to be called before anyone else 600 // by placing it into .preinit_array section. 601 // FIXME: do we have anything like this on Mac? 602 __attribute__((section(".preinit_array"))) 603 typeof(__asan_init) *__asan_preinit =__asan_init; 604#elif defined(_WIN32) && defined(_DLL) 605 // On Windows, when using dynamic CRT (/MD), we can put a pointer 606 // to __asan_init into the global list of C initializers. 607 // See crt0dat.c in the CRT sources for the details. 608 #pragma section(".CRT$XIB", long, read) // NOLINT 609 __declspec(allocate(".CRT$XIB")) void (*__asan_preinit)() = __asan_init; 610#endif 611