asan_rtl.cc revision e5f5895bda30f374b0b51412fd4d837fa59aed66
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 25namespace __asan { 26using namespace __sanitizer; 27 28// -------------------------- Flags ------------------------- {{{1 29static const uptr kMallocContextSize = 30; 30 31uptr FLAG_malloc_context_size = kMallocContextSize; 32uptr FLAG_max_malloc_fill_size = 0; 33s64 FLAG_v = 0; 34uptr FLAG_redzone = (ASAN_LOW_MEMORY) ? 64 : 128; // power of two, >= 32 35uptr FLAG_quarantine_size = (ASAN_LOW_MEMORY) ? 1UL << 24 : 1UL << 28; 36static s64 FLAG_atexit = 0; 37bool FLAG_poison_shadow = 1; 38s64 FLAG_report_globals = 1; 39bool FLAG_handle_segv = ASAN_NEEDS_SEGV; 40bool FLAG_use_sigaltstack = 0; 41bool FLAG_symbolize = 0; 42s64 FLAG_demangle = 1; 43s64 FLAG_debug = 0; 44bool FLAG_replace_cfallocator = 1; // Used on Mac only. 45bool FLAG_replace_str = 1; 46bool FLAG_replace_intrin = 1; 47bool FLAG_use_fake_stack = 1; 48s64 FLAG_exitcode = ASAN_DEFAULT_FAILURE_EXITCODE; 49bool FLAG_allow_user_poisoning = 1; 50s64 FLAG_sleep_before_dying = 0; 51bool FLAG_abort_on_error = 0; 52bool FLAG_unmap_shadow_on_exit = 0; 53bool FLAG_disable_core = __WORDSIZE == 64; 54bool FLAG_check_malloc_usable_size = 1; 55 56// -------------------------- Globals --------------------- {{{1 57int asan_inited; 58bool asan_init_is_running; 59static void (*death_callback)(void); 60static void (*error_report_callback)(const char*); 61char *error_message_buffer = 0; 62uptr error_message_buffer_pos = 0; 63uptr error_message_buffer_size = 0; 64 65// -------------------------- Misc ---------------- {{{1 66void ShowStatsAndAbort() { 67 __asan_print_accumulated_stats(); 68 AsanDie(); 69} 70 71static void PrintBytes(const char *before, uptr *a) { 72 u8 *bytes = (u8*)a; 73 uptr byte_num = (__WORDSIZE) / 8; 74 Printf("%s%p:", before, (void*)a); 75 for (uptr i = 0; i < byte_num; i++) { 76 Printf(" %x%x", bytes[i] >> 4, bytes[i] & 15); 77 } 78 Printf("\n"); 79} 80 81uptr ReadFileToBuffer(const char *file_name, char **buff, 82 uptr *buff_size, uptr max_len) { 83 const uptr kMinFileLen = kPageSize; 84 uptr read_len = 0; 85 *buff = 0; 86 *buff_size = 0; 87 // The files we usually open are not seekable, so try different buffer sizes. 88 for (uptr size = kMinFileLen; size <= max_len; size *= 2) { 89 int fd = AsanOpenReadonly(file_name); 90 if (fd < 0) return 0; 91 AsanUnmapOrDie(*buff, *buff_size); 92 *buff = (char*)AsanMmapSomewhereOrDie(size, __FUNCTION__); 93 *buff_size = size; 94 // Read up to one page at a time. 95 read_len = 0; 96 bool reached_eof = false; 97 while (read_len + kPageSize <= size) { 98 uptr just_read = AsanRead(fd, *buff + read_len, kPageSize); 99 if (just_read == 0) { 100 reached_eof = true; 101 break; 102 } 103 read_len += just_read; 104 } 105 AsanClose(fd); 106 if (reached_eof) // We've read the whole file. 107 break; 108 } 109 return read_len; 110} 111 112void AsanDie() { 113 static int num_calls = 0; 114 if (AtomicInc(&num_calls) > 1) { 115 // Don't die twice - run a busy loop. 116 while (1) { } 117 } 118 if (FLAG_sleep_before_dying) { 119 Report("Sleeping for %d second(s)\n", FLAG_sleep_before_dying); 120 SleepForSeconds(FLAG_sleep_before_dying); 121 } 122 if (FLAG_unmap_shadow_on_exit) 123 AsanUnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg); 124 if (death_callback) 125 death_callback(); 126 if (FLAG_abort_on_error) 127 Abort(); 128 Exit(FLAG_exitcode); 129} 130 131// ---------------------- mmap -------------------- {{{1 132void OutOfMemoryMessageAndDie(const char *mem_type, uptr size) { 133 Report("ERROR: AddressSanitizer failed to allocate " 134 "0x%zx (%zd) bytes of %s\n", 135 size, size, mem_type); 136 PRINT_CURRENT_STACK(); 137 ShowStatsAndAbort(); 138} 139 140// Reserve memory range [beg, end]. 141static void ReserveShadowMemoryRange(uptr beg, uptr end) { 142 CHECK((beg % kPageSize) == 0); 143 CHECK(((end + 1) % kPageSize) == 0); 144 uptr size = end - beg + 1; 145 void *res = AsanMmapFixedNoReserve(beg, size); 146 CHECK(res == (void*)beg && "ReserveShadowMemoryRange failed"); 147} 148 149// ---------------------- LowLevelAllocator ------------- {{{1 150void *LowLevelAllocator::Allocate(uptr size) { 151 CHECK((size & (size - 1)) == 0 && "size must be a power of two"); 152 if (allocated_end_ - allocated_current_ < size) { 153 uptr size_to_allocate = Max(size, kPageSize); 154 allocated_current_ = 155 (char*)AsanMmapSomewhereOrDie(size_to_allocate, __FUNCTION__); 156 allocated_end_ = allocated_current_ + size_to_allocate; 157 PoisonShadow((uptr)allocated_current_, size_to_allocate, 158 kAsanInternalHeapMagic); 159 } 160 CHECK(allocated_end_ - allocated_current_ >= size); 161 void *res = allocated_current_; 162 allocated_current_ += size; 163 return res; 164} 165 166// ---------------------- DescribeAddress -------------------- {{{1 167static bool DescribeStackAddress(uptr addr, uptr access_size) { 168 AsanThread *t = asanThreadRegistry().FindThreadByStackAddress(addr); 169 if (!t) return false; 170 const sptr kBufSize = 4095; 171 char buf[kBufSize]; 172 uptr offset = 0; 173 const char *frame_descr = t->GetFrameNameByAddr(addr, &offset); 174 // This string is created by the compiler and has the following form: 175 // "FunctioName n alloc_1 alloc_2 ... alloc_n" 176 // where alloc_i looks like "offset size len ObjectName ". 177 CHECK(frame_descr); 178 // Report the function name and the offset. 179 const char *name_end = internal_strchr(frame_descr, ' '); 180 CHECK(name_end); 181 buf[0] = 0; 182 internal_strncat(buf, frame_descr, 183 Min(kBufSize, 184 static_cast<sptr>(name_end - frame_descr))); 185 Printf("Address %p is located at offset %zu " 186 "in frame <%s> of T%d's stack:\n", 187 addr, offset, buf, t->tid()); 188 // Report the number of stack objects. 189 char *p; 190 uptr n_objects = internal_simple_strtoll(name_end, &p, 10); 191 CHECK(n_objects > 0); 192 Printf(" This frame has %zu object(s):\n", n_objects); 193 // Report all objects in this frame. 194 for (uptr i = 0; i < n_objects; i++) { 195 uptr beg, size; 196 sptr len; 197 beg = internal_simple_strtoll(p, &p, 10); 198 size = internal_simple_strtoll(p, &p, 10); 199 len = internal_simple_strtoll(p, &p, 10); 200 if (beg <= 0 || size <= 0 || len < 0 || *p != ' ') { 201 Printf("AddressSanitizer can't parse the stack frame descriptor: |%s|\n", 202 frame_descr); 203 break; 204 } 205 p++; 206 buf[0] = 0; 207 internal_strncat(buf, p, Min(kBufSize, len)); 208 p += len; 209 Printf(" [%zu, %zu) '%s'\n", beg, beg + size, buf); 210 } 211 Printf("HINT: this may be a false positive if your program uses " 212 "some custom stack unwind mechanism\n" 213 " (longjmp and C++ exceptions *are* supported)\n"); 214 t->summary()->Announce(); 215 return true; 216} 217 218static NOINLINE void DescribeAddress(uptr addr, uptr access_size) { 219 // Check if this is a global. 220 if (DescribeAddrIfGlobal(addr)) 221 return; 222 223 if (DescribeStackAddress(addr, access_size)) 224 return; 225 226 // finally, check if this is a heap. 227 DescribeHeapAddress(addr, access_size); 228} 229 230// -------------------------- Run-time entry ------------------- {{{1 231// exported functions 232#define ASAN_REPORT_ERROR(type, is_write, size) \ 233extern "C" NOINLINE ASAN_INTERFACE_ATTRIBUTE \ 234void __asan_report_ ## type ## size(uptr addr); \ 235void __asan_report_ ## type ## size(uptr addr) { \ 236 GET_CALLER_PC_BP_SP; \ 237 __asan_report_error(pc, bp, sp, addr, is_write, size); \ 238} 239 240ASAN_REPORT_ERROR(load, false, 1) 241ASAN_REPORT_ERROR(load, false, 2) 242ASAN_REPORT_ERROR(load, false, 4) 243ASAN_REPORT_ERROR(load, false, 8) 244ASAN_REPORT_ERROR(load, false, 16) 245ASAN_REPORT_ERROR(store, true, 1) 246ASAN_REPORT_ERROR(store, true, 2) 247ASAN_REPORT_ERROR(store, true, 4) 248ASAN_REPORT_ERROR(store, true, 8) 249ASAN_REPORT_ERROR(store, true, 16) 250 251// Force the linker to keep the symbols for various ASan interface functions. 252// We want to keep those in the executable in order to let the instrumented 253// dynamic libraries access the symbol even if it is not used by the executable 254// itself. This should help if the build system is removing dead code at link 255// time. 256static NOINLINE void force_interface_symbols() { 257 volatile int fake_condition = 0; // prevent dead condition elimination. 258 if (fake_condition) { 259 __asan_report_load1(0); 260 __asan_report_load2(0); 261 __asan_report_load4(0); 262 __asan_report_load8(0); 263 __asan_report_load16(0); 264 __asan_report_store1(0); 265 __asan_report_store2(0); 266 __asan_report_store4(0); 267 __asan_report_store8(0); 268 __asan_report_store16(0); 269 __asan_register_global(0, 0, 0); 270 __asan_register_globals(0, 0); 271 __asan_unregister_globals(0, 0); 272 __asan_set_death_callback(0); 273 __asan_set_error_report_callback(0); 274 __asan_handle_no_return(); 275 } 276} 277 278// -------------------------- Init ------------------- {{{1 279static void IntFlagValue(const char *flags, const char *flag, 280 s64 *out_val) { 281 if (!flags) return; 282 const char *str = internal_strstr(flags, flag); 283 if (!str) return; 284 *out_val = internal_atoll(str + internal_strlen(flag)); 285} 286 287static void BoolFlagValue(const char *flags, const char *flag, 288 bool *out_val) { 289 if (!flags) return; 290 const char *str = internal_strstr(flags, flag); 291 if (!str) return; 292 const char *suffix = str + internal_strlen(flag); 293 if (!internal_atoll(str + internal_strlen(flag))) { 294 if (suffix[0] == '0') { 295 *out_val = false; 296 return; 297 } 298 } else { 299 *out_val = true; 300 return; 301 } 302 switch (suffix[0]) { 303 case 'y': 304 case 't': { 305 *out_val = true; 306 break; 307 } 308 case 'n': 309 case 'f': { 310 *out_val = false; 311 break; 312 } 313 default: return; 314 } 315} 316 317static void asan_atexit() { 318 Printf("AddressSanitizer exit stats:\n"); 319 __asan_print_accumulated_stats(); 320} 321 322void CheckFailed(const char *cond, const char *file, int line) { 323 Report("CHECK failed: %s at %s:%d\n", cond, file, line); 324 PRINT_CURRENT_STACK(); 325 ShowStatsAndAbort(); 326} 327 328} // namespace __asan 329 330// ---------------------- Interface ---------------- {{{1 331using namespace __asan; // NOLINT 332 333int __asan_set_error_exit_code(int exit_code) { 334 int old = FLAG_exitcode; 335 FLAG_exitcode = exit_code; 336 return old; 337} 338 339void NOINLINE __asan_handle_no_return() { 340 int local_stack; 341 AsanThread *curr_thread = asanThreadRegistry().GetCurrent(); 342 CHECK(curr_thread); 343 uptr top = curr_thread->stack_top(); 344 uptr bottom = ((uptr)&local_stack - kPageSize) & ~(kPageSize-1); 345 PoisonShadow(bottom, top - bottom, 0); 346} 347 348void NOINLINE __asan_set_death_callback(void (*callback)(void)) { 349 death_callback = callback; 350} 351 352void NOINLINE __asan_set_error_report_callback(void (*callback)(const char*)) { 353 error_report_callback = callback; 354 if (callback) { 355 error_message_buffer_size = 1 << 16; 356 error_message_buffer = 357 (char*)AsanMmapSomewhereOrDie(error_message_buffer_size, __FUNCTION__); 358 error_message_buffer_pos = 0; 359 } 360} 361 362void __asan_report_error(uptr pc, uptr bp, uptr sp, 363 uptr addr, bool is_write, uptr access_size) { 364 // Do not print more than one report, otherwise they will mix up. 365 static int num_calls = 0; 366 if (AtomicInc(&num_calls) > 1) return; 367 368 Printf("=================================================================\n"); 369 const char *bug_descr = "unknown-crash"; 370 if (AddrIsInMem(addr)) { 371 u8 *shadow_addr = (u8*)MemToShadow(addr); 372 // If we are accessing 16 bytes, look at the second shadow byte. 373 if (*shadow_addr == 0 && access_size > SHADOW_GRANULARITY) 374 shadow_addr++; 375 // If we are in the partial right redzone, look at the next shadow byte. 376 if (*shadow_addr > 0 && *shadow_addr < 128) 377 shadow_addr++; 378 switch (*shadow_addr) { 379 case kAsanHeapLeftRedzoneMagic: 380 case kAsanHeapRightRedzoneMagic: 381 bug_descr = "heap-buffer-overflow"; 382 break; 383 case kAsanHeapFreeMagic: 384 bug_descr = "heap-use-after-free"; 385 break; 386 case kAsanStackLeftRedzoneMagic: 387 bug_descr = "stack-buffer-underflow"; 388 break; 389 case kAsanStackMidRedzoneMagic: 390 case kAsanStackRightRedzoneMagic: 391 case kAsanStackPartialRedzoneMagic: 392 bug_descr = "stack-buffer-overflow"; 393 break; 394 case kAsanStackAfterReturnMagic: 395 bug_descr = "stack-use-after-return"; 396 break; 397 case kAsanUserPoisonedMemoryMagic: 398 bug_descr = "use-after-poison"; 399 break; 400 case kAsanGlobalRedzoneMagic: 401 bug_descr = "global-buffer-overflow"; 402 break; 403 } 404 } 405 406 AsanThread *curr_thread = asanThreadRegistry().GetCurrent(); 407 int curr_tid = asanThreadRegistry().GetCurrentTidOrMinusOne(); 408 409 if (curr_thread) { 410 // We started reporting an error message. Stop using the fake stack 411 // in case we will call an instrumented function from a symbolizer. 412 curr_thread->fake_stack().StopUsingFakeStack(); 413 } 414 415 Report("ERROR: AddressSanitizer %s on address " 416 "%p at pc 0x%zx bp 0x%zx sp 0x%zx\n", 417 bug_descr, addr, pc, bp, sp); 418 419 Printf("%s of size %zu at %p thread T%d\n", 420 access_size ? (is_write ? "WRITE" : "READ") : "ACCESS", 421 access_size, addr, curr_tid); 422 423 if (FLAG_debug) { 424 PrintBytes("PC: ", (uptr*)pc); 425 } 426 427 GET_STACK_TRACE_WITH_PC_AND_BP(kStackTraceMax, pc, bp); 428 stack.PrintStack(); 429 430 CHECK(AddrIsInMem(addr)); 431 432 DescribeAddress(addr, access_size); 433 434 uptr shadow_addr = MemToShadow(addr); 435 Report("ABORTING\n"); 436 __asan_print_accumulated_stats(); 437 Printf("Shadow byte and word:\n"); 438 Printf(" %p: %x\n", shadow_addr, *(unsigned char*)shadow_addr); 439 uptr aligned_shadow = shadow_addr & ~(kWordSize - 1); 440 PrintBytes(" ", (uptr*)(aligned_shadow)); 441 Printf("More shadow bytes:\n"); 442 PrintBytes(" ", (uptr*)(aligned_shadow-4*kWordSize)); 443 PrintBytes(" ", (uptr*)(aligned_shadow-3*kWordSize)); 444 PrintBytes(" ", (uptr*)(aligned_shadow-2*kWordSize)); 445 PrintBytes(" ", (uptr*)(aligned_shadow-1*kWordSize)); 446 PrintBytes("=>", (uptr*)(aligned_shadow+0*kWordSize)); 447 PrintBytes(" ", (uptr*)(aligned_shadow+1*kWordSize)); 448 PrintBytes(" ", (uptr*)(aligned_shadow+2*kWordSize)); 449 PrintBytes(" ", (uptr*)(aligned_shadow+3*kWordSize)); 450 PrintBytes(" ", (uptr*)(aligned_shadow+4*kWordSize)); 451 if (error_report_callback) { 452 error_report_callback(error_message_buffer); 453 } 454 AsanDie(); 455} 456 457static void ParseAsanOptions(const char *options) { 458 IntFlagValue(options, "malloc_context_size=", 459 (s64*)&FLAG_malloc_context_size); 460 CHECK(FLAG_malloc_context_size <= kMallocContextSize); 461 462 IntFlagValue(options, "max_malloc_fill_size=", 463 (s64*)&FLAG_max_malloc_fill_size); 464 465 IntFlagValue(options, "verbosity=", &FLAG_v); 466 467 IntFlagValue(options, "redzone=", (s64*)&FLAG_redzone); 468 CHECK(FLAG_redzone >= 32); 469 CHECK((FLAG_redzone & (FLAG_redzone - 1)) == 0); 470 IntFlagValue(options, "quarantine_size=", (s64*)&FLAG_quarantine_size); 471 472 IntFlagValue(options, "atexit=", &FLAG_atexit); 473 BoolFlagValue(options, "poison_shadow=", &FLAG_poison_shadow); 474 IntFlagValue(options, "report_globals=", &FLAG_report_globals); 475 BoolFlagValue(options, "handle_segv=", &FLAG_handle_segv); 476 BoolFlagValue(options, "use_sigaltstack=", &FLAG_use_sigaltstack); 477 BoolFlagValue(options, "symbolize=", &FLAG_symbolize); 478 IntFlagValue(options, "demangle=", &FLAG_demangle); 479 IntFlagValue(options, "debug=", &FLAG_debug); 480 BoolFlagValue(options, "replace_cfallocator=", &FLAG_replace_cfallocator); 481 BoolFlagValue(options, "replace_str=", &FLAG_replace_str); 482 BoolFlagValue(options, "replace_intrin=", &FLAG_replace_intrin); 483 BoolFlagValue(options, "use_fake_stack=", &FLAG_use_fake_stack); 484 IntFlagValue(options, "exitcode=", &FLAG_exitcode); 485 BoolFlagValue(options, "allow_user_poisoning=", &FLAG_allow_user_poisoning); 486 IntFlagValue(options, "sleep_before_dying=", &FLAG_sleep_before_dying); 487 BoolFlagValue(options, "abort_on_error=", &FLAG_abort_on_error); 488 BoolFlagValue(options, "unmap_shadow_on_exit=", &FLAG_unmap_shadow_on_exit); 489 // By default, disable core dumper on 64-bit -- 490 // it makes little sense to dump 16T+ core. 491 BoolFlagValue(options, "disable_core=", &FLAG_disable_core); 492 493 // Allow the users to work around the bug in Nvidia drivers prior to 295.*. 494 BoolFlagValue(options, "check_malloc_usable_size=", 495 &FLAG_check_malloc_usable_size); 496} 497 498void __asan_init() { 499 if (asan_inited) return; 500 MiniLibcStub(); // FIXME: remove me once mini libc build is tested properly. 501 asan_init_is_running = true; 502 503 // Make sure we are not statically linked. 504 AsanDoesNotSupportStaticLinkage(); 505 506#if !defined(_WIN32) 507 if (__asan_default_options) { 508 ParseAsanOptions(__asan_default_options); 509 if (FLAG_v) { 510 Report("Using the defaults from __asan_default_options: %s\n", 511 __asan_default_options); 512 } 513 } 514#endif 515 // flags 516 const char *options = AsanGetEnv("ASAN_OPTIONS"); 517 ParseAsanOptions(options); 518 519 if (FLAG_v && options) { 520 Report("Parsed ASAN_OPTIONS: %s\n", options); 521 } 522 523 if (FLAG_atexit) { 524 Atexit(asan_atexit); 525 } 526 527 // interceptors 528 InitializeAsanInterceptors(); 529 530 ReplaceSystemMalloc(); 531 ReplaceOperatorsNewAndDelete(); 532 533 if (FLAG_v) { 534 Printf("|| `[%p, %p]` || HighMem ||\n", kHighMemBeg, kHighMemEnd); 535 Printf("|| `[%p, %p]` || HighShadow ||\n", 536 kHighShadowBeg, kHighShadowEnd); 537 Printf("|| `[%p, %p]` || ShadowGap ||\n", 538 kShadowGapBeg, kShadowGapEnd); 539 Printf("|| `[%p, %p]` || LowShadow ||\n", 540 kLowShadowBeg, kLowShadowEnd); 541 Printf("|| `[%p, %p]` || LowMem ||\n", kLowMemBeg, kLowMemEnd); 542 Printf("MemToShadow(shadow): %p %p %p %p\n", 543 MEM_TO_SHADOW(kLowShadowBeg), 544 MEM_TO_SHADOW(kLowShadowEnd), 545 MEM_TO_SHADOW(kHighShadowBeg), 546 MEM_TO_SHADOW(kHighShadowEnd)); 547 Printf("red_zone=%zu\n", (uptr)FLAG_redzone); 548 Printf("malloc_context_size=%zu\n", (uptr)FLAG_malloc_context_size); 549 550 Printf("SHADOW_SCALE: %zx\n", (uptr)SHADOW_SCALE); 551 Printf("SHADOW_GRANULARITY: %zx\n", (uptr)SHADOW_GRANULARITY); 552 Printf("SHADOW_OFFSET: %zx\n", (uptr)SHADOW_OFFSET); 553 CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7); 554 } 555 556 if (FLAG_disable_core) { 557 AsanDisableCoreDumper(); 558 } 559 560 if (AsanShadowRangeIsAvailable()) { 561 if (kLowShadowBeg != kLowShadowEnd) { 562 // mmap the low shadow plus at least one page. 563 ReserveShadowMemoryRange(kLowShadowBeg - kMmapGranularity, kLowShadowEnd); 564 } 565 // mmap the high shadow. 566 ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd); 567 // protect the gap 568 void *prot = AsanMprotect(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1); 569 CHECK(prot == (void*)kShadowGapBeg); 570 } else { 571 Report("Shadow memory range interleaves with an existing memory mapping. " 572 "ASan cannot proceed correctly. ABORTING.\n"); 573 AsanDumpProcessMap(); 574 AsanDie(); 575 } 576 577 InstallSignalHandlers(); 578 579 // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited 580 // should be set to 1 prior to initializing the threads. 581 asan_inited = 1; 582 asan_init_is_running = false; 583 584 asanThreadRegistry().Init(); 585 asanThreadRegistry().GetMain()->ThreadStart(); 586 force_interface_symbols(); // no-op. 587 588 if (FLAG_v) { 589 Report("AddressSanitizer Init done\n"); 590 } 591} 592 593#if defined(ASAN_USE_PREINIT_ARRAY) 594 // On Linux, we force __asan_init to be called before anyone else 595 // by placing it into .preinit_array section. 596 // FIXME: do we have anything like this on Mac? 597 __attribute__((section(".preinit_array"))) 598 typeof(__asan_init) *__asan_preinit =__asan_init; 599#elif defined(_WIN32) && defined(_DLL) 600 // On Windows, when using dynamic CRT (/MD), we can put a pointer 601 // to __asan_init into the global list of C initializers. 602 // See crt0dat.c in the CRT sources for the details. 603 #pragma section(".CRT$XIB", long, read) // NOLINT 604 __declspec(allocate(".CRT$XIB")) void (*__asan_preinit)() = __asan_init; 605#endif 606