asan_rtl.cc revision 7f80655d8283dbdf77bfee4a849eed4d59e95c7a 
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_internal.h"
17#include "asan_internal.h"
18#include "asan_mapping.h"
19#include "asan_poisoning.h"
20#include "asan_report.h"
21#include "asan_stack.h"
22#include "asan_stats.h"
23#include "asan_thread.h"
24#include "sanitizer_common/sanitizer_atomic.h"
25#include "sanitizer_common/sanitizer_flags.h"
26#include "sanitizer_common/sanitizer_libc.h"
27#include "sanitizer_common/sanitizer_symbolizer.h"
28#include "lsan/lsan_common.h"
29
30int __asan_option_detect_stack_use_after_return;  // Global interface symbol.
31
32namespace __asan {
33
34uptr AsanMappingProfile[kAsanMappingProfileSize];
35
36static void AsanDie() {
37  static atomic_uint32_t num_calls;
38  if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) {
39    // Don't die twice - run a busy loop.
40    while (1) { }
41  }
42  if (flags()->sleep_before_dying) {
43    Report("Sleeping for %d second(s)\n", flags()->sleep_before_dying);
44    SleepForSeconds(flags()->sleep_before_dying);
45  }
46  if (flags()->unmap_shadow_on_exit) {
47    if (kMidMemBeg) {
48      UnmapOrDie((void*)kLowShadowBeg, kMidMemBeg - kLowShadowBeg);
49      UnmapOrDie((void*)kMidMemEnd, kHighShadowEnd - kMidMemEnd);
50    } else {
51      UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg);
52    }
53  }
54  if (death_callback)
55    death_callback();
56  if (flags()->abort_on_error)
57    Abort();
58  internal__exit(flags()->exitcode);
59}
60
61static void AsanCheckFailed(const char *file, int line, const char *cond,
62                            u64 v1, u64 v2) {
63  Report("AddressSanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n",
64             file, line, cond, (uptr)v1, (uptr)v2);
65  // FIXME: check for infinite recursion without a thread-local counter here.
66  PRINT_CURRENT_STACK();
67  Die();
68}
69
70// -------------------------- Flags ------------------------- {{{1
71static const int kDefaultMallocContextSize = 30;
72
73Flags asan_flags_dont_use_directly;  // use via flags().
74
75static const char *MaybeCallAsanDefaultOptions() {
76  return (&__asan_default_options) ? __asan_default_options() : "";
77}
78
79static const char *MaybeUseAsanDefaultOptionsCompileDefiniton() {
80#ifdef ASAN_DEFAULT_OPTIONS
81// Stringize the macro value.
82# define ASAN_STRINGIZE(x) #x
83# define ASAN_STRINGIZE_OPTIONS(options) ASAN_STRINGIZE(options)
84  return ASAN_STRINGIZE_OPTIONS(ASAN_DEFAULT_OPTIONS);
85#else
86  return "";
87#endif
88}
89
90static void ParseFlagsFromString(Flags *f, const char *str) {
91  ParseCommonFlagsFromString(str);
92  CHECK((uptr)common_flags()->malloc_context_size <= kStackTraceMax);
93
94  ParseFlag(str, &f->quarantine_size, "quarantine_size");
95  ParseFlag(str, &f->redzone, "redzone");
96  CHECK_GE(f->redzone, 16);
97  CHECK(IsPowerOfTwo(f->redzone));
98
99  ParseFlag(str, &f->debug, "debug");
100  ParseFlag(str, &f->report_globals, "report_globals");
101  ParseFlag(str, &f->check_initialization_order, "check_initialization_order");
102
103  ParseFlag(str, &f->replace_str, "replace_str");
104  ParseFlag(str, &f->replace_intrin, "replace_intrin");
105  ParseFlag(str, &f->mac_ignore_invalid_free, "mac_ignore_invalid_free");
106  ParseFlag(str, &f->detect_stack_use_after_return,
107            "detect_stack_use_after_return");
108  ParseFlag(str, &f->uar_stack_size_log, "uar_stack_size_log");
109  ParseFlag(str, &f->max_malloc_fill_size, "max_malloc_fill_size");
110  ParseFlag(str, &f->malloc_fill_byte, "malloc_fill_byte");
111  ParseFlag(str, &f->exitcode, "exitcode");
112  ParseFlag(str, &f->allow_user_poisoning, "allow_user_poisoning");
113  ParseFlag(str, &f->sleep_before_dying, "sleep_before_dying");
114  ParseFlag(str, &f->handle_segv, "handle_segv");
115  ParseFlag(str, &f->allow_user_segv_handler, "allow_user_segv_handler");
116  ParseFlag(str, &f->use_sigaltstack, "use_sigaltstack");
117  ParseFlag(str, &f->check_malloc_usable_size, "check_malloc_usable_size");
118  ParseFlag(str, &f->unmap_shadow_on_exit, "unmap_shadow_on_exit");
119  ParseFlag(str, &f->abort_on_error, "abort_on_error");
120  ParseFlag(str, &f->print_stats, "print_stats");
121  ParseFlag(str, &f->print_legend, "print_legend");
122  ParseFlag(str, &f->atexit, "atexit");
123  ParseFlag(str, &f->disable_core, "disable_core");
124  ParseFlag(str, &f->allow_reexec, "allow_reexec");
125  ParseFlag(str, &f->print_full_thread_history, "print_full_thread_history");
126  ParseFlag(str, &f->poison_heap, "poison_heap");
127  ParseFlag(str, &f->poison_partial, "poison_partial");
128  ParseFlag(str, &f->alloc_dealloc_mismatch, "alloc_dealloc_mismatch");
129  ParseFlag(str, &f->strict_memcmp, "strict_memcmp");
130  ParseFlag(str, &f->strict_init_order, "strict_init_order");
131}
132
133void InitializeFlags(Flags *f, const char *env) {
134  CommonFlags *cf = common_flags();
135  cf->external_symbolizer_path = GetEnv("ASAN_SYMBOLIZER_PATH");
136  cf->symbolize = true;
137  cf->malloc_context_size = kDefaultMallocContextSize;
138  cf->fast_unwind_on_fatal = false;
139  cf->fast_unwind_on_malloc = true;
140  cf->strip_path_prefix = "";
141  cf->handle_ioctl = false;
142  cf->log_path = 0;
143  cf->detect_leaks = false;
144  cf->leak_check_at_exit = true;
145
146  internal_memset(f, 0, sizeof(*f));
147  f->quarantine_size = (ASAN_LOW_MEMORY) ? 1UL << 26 : 1UL << 28;
148  f->redzone = 16;
149  f->debug = false;
150  f->report_globals = 1;
151  f->check_initialization_order = true;
152  f->replace_str = true;
153  f->replace_intrin = true;
154  f->mac_ignore_invalid_free = false;
155  f->detect_stack_use_after_return = false;  // Also needs the compiler flag.
156  f->uar_stack_size_log = 0;
157  f->max_malloc_fill_size = 0x1000;  // By default, fill only the first 4K.
158  f->malloc_fill_byte = 0xbe;
159  f->exitcode = ASAN_DEFAULT_FAILURE_EXITCODE;
160  f->allow_user_poisoning = true;
161  f->sleep_before_dying = 0;
162  f->handle_segv = ASAN_NEEDS_SEGV;
163  f->allow_user_segv_handler = false;
164  f->use_sigaltstack = false;
165  f->check_malloc_usable_size = true;
166  f->unmap_shadow_on_exit = false;
167  f->abort_on_error = false;
168  f->print_stats = false;
169  f->print_legend = true;
170  f->atexit = false;
171  f->disable_core = (SANITIZER_WORDSIZE == 64);
172  f->allow_reexec = true;
173  f->print_full_thread_history = true;
174  f->poison_heap = true;
175  f->poison_partial = true;
176  // Turn off alloc/dealloc mismatch checker on Mac and Windows for now.
177  // TODO(glider,timurrrr): Fix known issues and enable this back.
178  f->alloc_dealloc_mismatch = (SANITIZER_MAC == 0) && (SANITIZER_WINDOWS == 0);
179  f->strict_memcmp = true;
180  f->strict_init_order = false;
181
182  // Override from compile definition.
183  ParseFlagsFromString(f, MaybeUseAsanDefaultOptionsCompileDefiniton());
184
185  // Override from user-specified string.
186  ParseFlagsFromString(f, MaybeCallAsanDefaultOptions());
187  if (common_flags()->verbosity) {
188    Report("Using the defaults from __asan_default_options: %s\n",
189           MaybeCallAsanDefaultOptions());
190  }
191
192  // Override from command line.
193  ParseFlagsFromString(f, env);
194
195#if !CAN_SANITIZE_LEAKS
196  if (cf->detect_leaks) {
197    Report("%s: detect_leaks is not supported on this platform.\n",
198           SanitizerToolName);
199    cf->detect_leaks = false;
200  }
201#endif
202}
203
204// -------------------------- Globals --------------------- {{{1
205int asan_inited;
206bool asan_init_is_running;
207void (*death_callback)(void);
208
209#if !ASAN_FIXED_MAPPING
210uptr kHighMemEnd, kMidMemBeg, kMidMemEnd;
211#endif
212
213// -------------------------- Misc ---------------- {{{1
214void ShowStatsAndAbort() {
215  __asan_print_accumulated_stats();
216  Die();
217}
218
219// ---------------------- mmap -------------------- {{{1
220// Reserve memory range [beg, end].
221static void ReserveShadowMemoryRange(uptr beg, uptr end) {
222  CHECK_EQ((beg % GetPageSizeCached()), 0);
223  CHECK_EQ(((end + 1) % GetPageSizeCached()), 0);
224  uptr size = end - beg + 1;
225  void *res = MmapFixedNoReserve(beg, size);
226  if (res != (void*)beg) {
227    Report("ReserveShadowMemoryRange failed while trying to map 0x%zx bytes. "
228           "Perhaps you're using ulimit -v\n", size);
229    Abort();
230  }
231}
232
233// --------------- LowLevelAllocateCallbac ---------- {{{1
234static void OnLowLevelAllocate(uptr ptr, uptr size) {
235  PoisonShadow(ptr, size, kAsanInternalHeapMagic);
236}
237
238// -------------------------- Run-time entry ------------------- {{{1
239// exported functions
240#define ASAN_REPORT_ERROR(type, is_write, size)                     \
241extern "C" NOINLINE INTERFACE_ATTRIBUTE                        \
242void __asan_report_ ## type ## size(uptr addr);                \
243void __asan_report_ ## type ## size(uptr addr) {               \
244  GET_CALLER_PC_BP_SP;                                              \
245  __asan_report_error(pc, bp, sp, addr, is_write, size);            \
246}
247
248ASAN_REPORT_ERROR(load, false, 1)
249ASAN_REPORT_ERROR(load, false, 2)
250ASAN_REPORT_ERROR(load, false, 4)
251ASAN_REPORT_ERROR(load, false, 8)
252ASAN_REPORT_ERROR(load, false, 16)
253ASAN_REPORT_ERROR(store, true, 1)
254ASAN_REPORT_ERROR(store, true, 2)
255ASAN_REPORT_ERROR(store, true, 4)
256ASAN_REPORT_ERROR(store, true, 8)
257ASAN_REPORT_ERROR(store, true, 16)
258
259#define ASAN_REPORT_ERROR_N(type, is_write)                    \
260extern "C" NOINLINE INTERFACE_ATTRIBUTE                        \
261void __asan_report_ ## type ## _n(uptr addr, uptr size);       \
262void __asan_report_ ## type ## _n(uptr addr, uptr size) {      \
263  GET_CALLER_PC_BP_SP;                                         \
264  __asan_report_error(pc, bp, sp, addr, is_write, size);       \
265}
266
267ASAN_REPORT_ERROR_N(load, false)
268ASAN_REPORT_ERROR_N(store, true)
269
270// Force the linker to keep the symbols for various ASan interface functions.
271// We want to keep those in the executable in order to let the instrumented
272// dynamic libraries access the symbol even if it is not used by the executable
273// itself. This should help if the build system is removing dead code at link
274// time.
275static NOINLINE void force_interface_symbols() {
276  volatile int fake_condition = 0;  // prevent dead condition elimination.
277  // __asan_report_* functions are noreturn, so we need a switch to prevent
278  // the compiler from removing any of them.
279  switch (fake_condition) {
280    case 1: __asan_report_load1(0); break;
281    case 2: __asan_report_load2(0); break;
282    case 3: __asan_report_load4(0); break;
283    case 4: __asan_report_load8(0); break;
284    case 5: __asan_report_load16(0); break;
285    case 6: __asan_report_store1(0); break;
286    case 7: __asan_report_store2(0); break;
287    case 8: __asan_report_store4(0); break;
288    case 9: __asan_report_store8(0); break;
289    case 10: __asan_report_store16(0); break;
290    case 12: __asan_register_globals(0, 0); break;
291    case 13: __asan_unregister_globals(0, 0); break;
292    case 14: __asan_set_death_callback(0); break;
293    case 15: __asan_set_error_report_callback(0); break;
294    case 16: __asan_handle_no_return(); break;
295    case 17: __asan_address_is_poisoned(0); break;
296    case 18: __asan_get_allocated_size(0); break;
297    case 19: __asan_get_current_allocated_bytes(); break;
298    case 20: __asan_get_estimated_allocated_size(0); break;
299    case 21: __asan_get_free_bytes(); break;
300    case 22: __asan_get_heap_size(); break;
301    case 23: __asan_get_ownership(0); break;
302    case 24: __asan_get_unmapped_bytes(); break;
303    case 25: __asan_poison_memory_region(0, 0); break;
304    case 26: __asan_unpoison_memory_region(0, 0); break;
305    case 27: __asan_set_error_exit_code(0); break;
306    case 30: __asan_before_dynamic_init(0); break;
307    case 31: __asan_after_dynamic_init(); break;
308    case 32: __asan_poison_stack_memory(0, 0); break;
309    case 33: __asan_unpoison_stack_memory(0, 0); break;
310    case 34: __asan_region_is_poisoned(0, 0); break;
311    case 35: __asan_describe_address(0); break;
312  }
313}
314
315static void asan_atexit() {
316  Printf("AddressSanitizer exit stats:\n");
317  __asan_print_accumulated_stats();
318  // Print AsanMappingProfile.
319  for (uptr i = 0; i < kAsanMappingProfileSize; i++) {
320    if (AsanMappingProfile[i] == 0) continue;
321    Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]);
322  }
323}
324
325static void InitializeHighMemEnd() {
326#if !ASAN_FIXED_MAPPING
327  kHighMemEnd = GetMaxVirtualAddress();
328  // Increase kHighMemEnd to make sure it's properly
329  // aligned together with kHighMemBeg:
330  kHighMemEnd |= SHADOW_GRANULARITY * GetPageSizeCached() - 1;
331#endif  // !ASAN_FIXED_MAPPING
332  CHECK_EQ((kHighMemBeg % GetPageSizeCached()), 0);
333}
334
335static void ProtectGap(uptr a, uptr size) {
336  CHECK_EQ(a, (uptr)Mprotect(a, size));
337}
338
339static void PrintAddressSpaceLayout() {
340  Printf("|| `[%p, %p]` || HighMem    ||\n",
341         (void*)kHighMemBeg, (void*)kHighMemEnd);
342  Printf("|| `[%p, %p]` || HighShadow ||\n",
343         (void*)kHighShadowBeg, (void*)kHighShadowEnd);
344  if (kMidMemBeg) {
345    Printf("|| `[%p, %p]` || ShadowGap3 ||\n",
346           (void*)kShadowGap3Beg, (void*)kShadowGap3End);
347    Printf("|| `[%p, %p]` || MidMem     ||\n",
348           (void*)kMidMemBeg, (void*)kMidMemEnd);
349    Printf("|| `[%p, %p]` || ShadowGap2 ||\n",
350           (void*)kShadowGap2Beg, (void*)kShadowGap2End);
351    Printf("|| `[%p, %p]` || MidShadow  ||\n",
352           (void*)kMidShadowBeg, (void*)kMidShadowEnd);
353  }
354  Printf("|| `[%p, %p]` || ShadowGap  ||\n",
355         (void*)kShadowGapBeg, (void*)kShadowGapEnd);
356  if (kLowShadowBeg) {
357    Printf("|| `[%p, %p]` || LowShadow  ||\n",
358           (void*)kLowShadowBeg, (void*)kLowShadowEnd);
359    Printf("|| `[%p, %p]` || LowMem     ||\n",
360           (void*)kLowMemBeg, (void*)kLowMemEnd);
361  }
362  Printf("MemToShadow(shadow): %p %p %p %p",
363         (void*)MEM_TO_SHADOW(kLowShadowBeg),
364         (void*)MEM_TO_SHADOW(kLowShadowEnd),
365         (void*)MEM_TO_SHADOW(kHighShadowBeg),
366         (void*)MEM_TO_SHADOW(kHighShadowEnd));
367  if (kMidMemBeg) {
368    Printf(" %p %p",
369           (void*)MEM_TO_SHADOW(kMidShadowBeg),
370           (void*)MEM_TO_SHADOW(kMidShadowEnd));
371  }
372  Printf("\n");
373  Printf("red_zone=%zu\n", (uptr)flags()->redzone);
374  Printf("quarantine_size=%zuM\n", (uptr)flags()->quarantine_size >> 20);
375  Printf("malloc_context_size=%zu\n",
376         (uptr)common_flags()->malloc_context_size);
377
378  Printf("SHADOW_SCALE: %zx\n", (uptr)SHADOW_SCALE);
379  Printf("SHADOW_GRANULARITY: %zx\n", (uptr)SHADOW_GRANULARITY);
380  Printf("SHADOW_OFFSET: %zx\n", (uptr)SHADOW_OFFSET);
381  CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7);
382  if (kMidMemBeg)
383    CHECK(kMidShadowBeg > kLowShadowEnd &&
384          kMidMemBeg > kMidShadowEnd &&
385          kHighShadowBeg > kMidMemEnd);
386}
387
388}  // namespace __asan
389
390// ---------------------- Interface ---------------- {{{1
391using namespace __asan;  // NOLINT
392
393#if !SANITIZER_SUPPORTS_WEAK_HOOKS
394extern "C" {
395SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
396const char* __asan_default_options() { return ""; }
397}  // extern "C"
398#endif
399
400int NOINLINE __asan_set_error_exit_code(int exit_code) {
401  int old = flags()->exitcode;
402  flags()->exitcode = exit_code;
403  return old;
404}
405
406void NOINLINE __asan_handle_no_return() {
407  int local_stack;
408  AsanThread *curr_thread = GetCurrentThread();
409  CHECK(curr_thread);
410  uptr PageSize = GetPageSizeCached();
411  uptr top = curr_thread->stack_top();
412  uptr bottom = ((uptr)&local_stack - PageSize) & ~(PageSize-1);
413  static const uptr kMaxExpectedCleanupSize = 64 << 20;  // 64M
414  if (top - bottom > kMaxExpectedCleanupSize) {
415    static bool reported_warning = false;
416    if (reported_warning)
417      return;
418    reported_warning = true;
419    Report("WARNING: ASan is ignoring requested __asan_handle_no_return: "
420           "stack top: %p; bottom %p; size: %p (%zd)\n"
421           "False positive error reports may follow\n"
422           "For details see "
423           "http://code.google.com/p/address-sanitizer/issues/detail?id=189\n",
424           top, bottom, top - bottom, top - bottom);
425    return;
426  }
427  PoisonShadow(bottom, top - bottom, 0);
428  if (curr_thread->has_fake_stack())
429    curr_thread->fake_stack()->HandleNoReturn();
430}
431
432void NOINLINE __asan_set_death_callback(void (*callback)(void)) {
433  death_callback = callback;
434}
435
436void __asan_init() {
437  if (asan_inited) return;
438  SanitizerToolName = "AddressSanitizer";
439  CHECK(!asan_init_is_running && "ASan init calls itself!");
440  asan_init_is_running = true;
441  InitializeHighMemEnd();
442
443  // Make sure we are not statically linked.
444  AsanDoesNotSupportStaticLinkage();
445
446  // Install tool-specific callbacks in sanitizer_common.
447  SetDieCallback(AsanDie);
448  SetCheckFailedCallback(AsanCheckFailed);
449  SetPrintfAndReportCallback(AppendToErrorMessageBuffer);
450
451  // Initialize flags. This must be done early, because most of the
452  // initialization steps look at flags().
453  const char *options = GetEnv("ASAN_OPTIONS");
454  InitializeFlags(flags(), options);
455  __sanitizer_set_report_path(common_flags()->log_path);
456  __asan_option_detect_stack_use_after_return =
457      flags()->detect_stack_use_after_return;
458
459  if (common_flags()->verbosity && options) {
460    Report("Parsed ASAN_OPTIONS: %s\n", options);
461  }
462
463  // Re-exec ourselves if we need to set additional env or command line args.
464  MaybeReexec();
465
466  // Setup internal allocator callback.
467  SetLowLevelAllocateCallback(OnLowLevelAllocate);
468
469  InitializeAsanInterceptors();
470
471  ReplaceSystemMalloc();
472  ReplaceOperatorsNewAndDelete();
473
474  uptr shadow_start = kLowShadowBeg;
475  if (kLowShadowBeg)
476    shadow_start -= GetMmapGranularity();
477  bool full_shadow_is_available =
478      MemoryRangeIsAvailable(shadow_start, kHighShadowEnd);
479
480#if SANITIZER_LINUX && defined(__x86_64__) && !ASAN_FIXED_MAPPING
481  if (!full_shadow_is_available) {
482    kMidMemBeg = kLowMemEnd < 0x3000000000ULL ? 0x3000000000ULL : 0;
483    kMidMemEnd = kLowMemEnd < 0x3000000000ULL ? 0x4fffffffffULL : 0;
484  }
485#endif
486
487  if (common_flags()->verbosity)
488    PrintAddressSpaceLayout();
489
490  if (flags()->disable_core) {
491    DisableCoreDumper();
492  }
493
494  if (full_shadow_is_available) {
495    // mmap the low shadow plus at least one page at the left.
496    if (kLowShadowBeg)
497      ReserveShadowMemoryRange(shadow_start, kLowShadowEnd);
498    // mmap the high shadow.
499    ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd);
500    // protect the gap.
501    ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
502  } else if (kMidMemBeg &&
503      MemoryRangeIsAvailable(shadow_start, kMidMemBeg - 1) &&
504      MemoryRangeIsAvailable(kMidMemEnd + 1, kHighShadowEnd)) {
505    CHECK(kLowShadowBeg != kLowShadowEnd);
506    // mmap the low shadow plus at least one page at the left.
507    ReserveShadowMemoryRange(shadow_start, kLowShadowEnd);
508    // mmap the mid shadow.
509    ReserveShadowMemoryRange(kMidShadowBeg, kMidShadowEnd);
510    // mmap the high shadow.
511    ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd);
512    // protect the gaps.
513    ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
514    ProtectGap(kShadowGap2Beg, kShadowGap2End - kShadowGap2Beg + 1);
515    ProtectGap(kShadowGap3Beg, kShadowGap3End - kShadowGap3Beg + 1);
516  } else {
517    Report("Shadow memory range interleaves with an existing memory mapping. "
518           "ASan cannot proceed correctly. ABORTING.\n");
519    DumpProcessMap();
520    Die();
521  }
522
523  AsanTSDInit(PlatformTSDDtor);
524  InstallSignalHandlers();
525
526  // Allocator should be initialized before starting external symbolizer, as
527  // fork() on Mac locks the allocator.
528  InitializeAllocator();
529
530  // Start symbolizer process if necessary.
531  if (common_flags()->symbolize) {
532    Symbolizer::Init(common_flags()->external_symbolizer_path);
533  } else {
534    Symbolizer::Disable();
535  }
536
537  // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
538  // should be set to 1 prior to initializing the threads.
539  asan_inited = 1;
540  asan_init_is_running = false;
541
542  if (flags()->atexit)
543    Atexit(asan_atexit);
544
545  // interceptors
546  InitTlsSize();
547
548  // Create main thread.
549  AsanThread *main_thread = AsanThread::Create(0, 0);
550  CreateThreadContextArgs create_main_args = { main_thread, 0 };
551  u32 main_tid = asanThreadRegistry().CreateThread(
552      0, true, 0, &create_main_args);
553  CHECK_EQ(0, main_tid);
554  SetCurrentThread(main_thread);
555  main_thread->ThreadStart(internal_getpid());
556  force_interface_symbols();  // no-op.
557
558#if CAN_SANITIZE_LEAKS
559  __lsan::InitCommonLsan();
560  if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) {
561    Atexit(__lsan::DoLeakCheck);
562  }
563#endif  // CAN_SANITIZE_LEAKS
564
565  if (common_flags()->verbosity) {
566    Report("AddressSanitizer Init done\n");
567  }
568}
569