1 //===-- asan_rtl.cc -------------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is a part of AddressSanitizer, an address sanity checker.
12 // Main file of the ASan run-time library.
13 //===----------------------------------------------------------------------===//
15 #include "asan_activation.h"
16 #include "asan_allocator.h"
17 #include "asan_interceptors.h"
18 #include "asan_interface_internal.h"
19 #include "asan_internal.h"
20 #include "asan_mapping.h"
21 #include "asan_poisoning.h"
22 #include "asan_report.h"
23 #include "asan_stack.h"
24 #include "asan_stats.h"
25 #include "asan_suppressions.h"
26 #include "asan_thread.h"
27 #include "sanitizer_common/sanitizer_atomic.h"
28 #include "sanitizer_common/sanitizer_flags.h"
29 #include "sanitizer_common/sanitizer_libc.h"
30 #include "sanitizer_common/sanitizer_symbolizer.h"
31 #include "lsan/lsan_common.h"
32 #include "ubsan/ubsan_init.h"
33 #include "ubsan/ubsan_platform.h"
35 uptr __asan_shadow_memory_dynamic_address; // Global interface symbol.
36 int __asan_option_detect_stack_use_after_return; // Global interface symbol.
37 uptr *__asan_test_only_reported_buggy_pointer; // Used only for testing asan.
41 uptr AsanMappingProfile[kAsanMappingProfileSize];
43 static void AsanDie() {
44 static atomic_uint32_t num_calls;
45 if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) {
46 // Don't die twice - run a busy loop.
49 if (flags()->sleep_before_dying) {
50 Report("Sleeping for %d second(s)\n", flags()->sleep_before_dying);
51 SleepForSeconds(flags()->sleep_before_dying);
53 if (flags()->unmap_shadow_on_exit) {
55 UnmapOrDie((void*)kLowShadowBeg, kMidMemBeg - kLowShadowBeg);
56 UnmapOrDie((void*)kMidMemEnd, kHighShadowEnd - kMidMemEnd);
58 UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg);
63 static void AsanCheckFailed(const char *file, int line, const char *cond,
65 Report("AddressSanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n", file,
66 line, cond, (uptr)v1, (uptr)v2);
67 // FIXME: check for infinite recursion without a thread-local counter here.
68 PRINT_CURRENT_STACK_CHECK();
72 // -------------------------- Globals --------------------- {{{1
74 bool asan_init_is_running;
76 #if !ASAN_FIXED_MAPPING
77 uptr kHighMemEnd, kMidMemBeg, kMidMemEnd;
80 // -------------------------- Misc ---------------- {{{1
81 void ShowStatsAndAbort() {
82 __asan_print_accumulated_stats();
86 // ---------------------- mmap -------------------- {{{1
87 // Reserve memory range [beg, end].
88 // We need to use inclusive range because end+1 may not be representable.
89 void ReserveShadowMemoryRange(uptr beg, uptr end, const char *name) {
90 CHECK_EQ((beg % GetMmapGranularity()), 0);
91 CHECK_EQ(((end + 1) % GetMmapGranularity()), 0);
92 uptr size = end - beg + 1;
93 DecreaseTotalMmap(size); // Don't count the shadow against mmap_limit_mb.
94 void *res = MmapFixedNoReserve(beg, size, name);
95 if (res != (void*)beg) {
96 Report("ReserveShadowMemoryRange failed while trying to map 0x%zx bytes. "
97 "Perhaps you're using ulimit -v\n", size);
100 if (common_flags()->no_huge_pages_for_shadow)
101 NoHugePagesInRegion(beg, size);
102 if (common_flags()->use_madv_dontdump)
103 DontDumpShadowMemory(beg, size);
106 // --------------- LowLevelAllocateCallbac ---------- {{{1
107 static void OnLowLevelAllocate(uptr ptr, uptr size) {
108 PoisonShadow(ptr, size, kAsanInternalHeapMagic);
111 // -------------------------- Run-time entry ------------------- {{{1
112 // exported functions
113 #define ASAN_REPORT_ERROR(type, is_write, size) \
114 extern "C" NOINLINE INTERFACE_ATTRIBUTE \
115 void __asan_report_ ## type ## size(uptr addr) { \
116 GET_CALLER_PC_BP_SP; \
117 ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true); \
119 extern "C" NOINLINE INTERFACE_ATTRIBUTE \
120 void __asan_report_exp_ ## type ## size(uptr addr, u32 exp) { \
121 GET_CALLER_PC_BP_SP; \
122 ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true); \
124 extern "C" NOINLINE INTERFACE_ATTRIBUTE \
125 void __asan_report_ ## type ## size ## _noabort(uptr addr) { \
126 GET_CALLER_PC_BP_SP; \
127 ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false); \
130 ASAN_REPORT_ERROR(load, false, 1)
131 ASAN_REPORT_ERROR(load, false, 2)
132 ASAN_REPORT_ERROR(load, false, 4)
133 ASAN_REPORT_ERROR(load, false, 8)
134 ASAN_REPORT_ERROR(load, false, 16)
135 ASAN_REPORT_ERROR(store, true, 1)
136 ASAN_REPORT_ERROR(store, true, 2)
137 ASAN_REPORT_ERROR(store, true, 4)
138 ASAN_REPORT_ERROR(store, true, 8)
139 ASAN_REPORT_ERROR(store, true, 16)
141 #define ASAN_REPORT_ERROR_N(type, is_write) \
142 extern "C" NOINLINE INTERFACE_ATTRIBUTE \
143 void __asan_report_ ## type ## _n(uptr addr, uptr size) { \
144 GET_CALLER_PC_BP_SP; \
145 ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true); \
147 extern "C" NOINLINE INTERFACE_ATTRIBUTE \
148 void __asan_report_exp_ ## type ## _n(uptr addr, uptr size, u32 exp) { \
149 GET_CALLER_PC_BP_SP; \
150 ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true); \
152 extern "C" NOINLINE INTERFACE_ATTRIBUTE \
153 void __asan_report_ ## type ## _n_noabort(uptr addr, uptr size) { \
154 GET_CALLER_PC_BP_SP; \
155 ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false); \
158 ASAN_REPORT_ERROR_N(load, false)
159 ASAN_REPORT_ERROR_N(store, true)
161 #define ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp_arg, fatal) \
162 uptr sp = MEM_TO_SHADOW(addr); \
163 uptr s = size <= SHADOW_GRANULARITY ? *reinterpret_cast<u8 *>(sp) \
164 : *reinterpret_cast<u16 *>(sp); \
166 if (UNLIKELY(size >= SHADOW_GRANULARITY || \
167 ((s8)((addr & (SHADOW_GRANULARITY - 1)) + size - 1)) >= \
169 if (__asan_test_only_reported_buggy_pointer) { \
170 *__asan_test_only_reported_buggy_pointer = addr; \
172 GET_CALLER_PC_BP_SP; \
173 ReportGenericError(pc, bp, sp, addr, is_write, size, exp_arg, \
179 #define ASAN_MEMORY_ACCESS_CALLBACK(type, is_write, size) \
180 extern "C" NOINLINE INTERFACE_ATTRIBUTE \
181 void __asan_##type##size(uptr addr) { \
182 ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, true) \
184 extern "C" NOINLINE INTERFACE_ATTRIBUTE \
185 void __asan_exp_##type##size(uptr addr, u32 exp) { \
186 ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp, true) \
188 extern "C" NOINLINE INTERFACE_ATTRIBUTE \
189 void __asan_##type##size ## _noabort(uptr addr) { \
190 ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, false) \
193 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 1)
194 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 2)
195 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 4)
196 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 8)
197 ASAN_MEMORY_ACCESS_CALLBACK(load, false, 16)
198 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 1)
199 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 2)
200 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 4)
201 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 8)
202 ASAN_MEMORY_ACCESS_CALLBACK(store, true, 16)
205 NOINLINE INTERFACE_ATTRIBUTE
206 void __asan_loadN(uptr addr, uptr size) {
207 if (__asan_region_is_poisoned(addr, size)) {
209 ReportGenericError(pc, bp, sp, addr, false, size, 0, true);
214 NOINLINE INTERFACE_ATTRIBUTE
215 void __asan_exp_loadN(uptr addr, uptr size, u32 exp) {
216 if (__asan_region_is_poisoned(addr, size)) {
218 ReportGenericError(pc, bp, sp, addr, false, size, exp, true);
223 NOINLINE INTERFACE_ATTRIBUTE
224 void __asan_loadN_noabort(uptr addr, uptr size) {
225 if (__asan_region_is_poisoned(addr, size)) {
227 ReportGenericError(pc, bp, sp, addr, false, size, 0, false);
232 NOINLINE INTERFACE_ATTRIBUTE
233 void __asan_storeN(uptr addr, uptr size) {
234 if (__asan_region_is_poisoned(addr, size)) {
236 ReportGenericError(pc, bp, sp, addr, true, size, 0, true);
241 NOINLINE INTERFACE_ATTRIBUTE
242 void __asan_exp_storeN(uptr addr, uptr size, u32 exp) {
243 if (__asan_region_is_poisoned(addr, size)) {
245 ReportGenericError(pc, bp, sp, addr, true, size, exp, true);
250 NOINLINE INTERFACE_ATTRIBUTE
251 void __asan_storeN_noabort(uptr addr, uptr size) {
252 if (__asan_region_is_poisoned(addr, size)) {
254 ReportGenericError(pc, bp, sp, addr, true, size, 0, false);
258 // Force the linker to keep the symbols for various ASan interface functions.
259 // We want to keep those in the executable in order to let the instrumented
260 // dynamic libraries access the symbol even if it is not used by the executable
261 // itself. This should help if the build system is removing dead code at link
263 static NOINLINE void force_interface_symbols() {
264 volatile int fake_condition = 0; // prevent dead condition elimination.
265 // __asan_report_* functions are noreturn, so we need a switch to prevent
266 // the compiler from removing any of them.
268 switch (fake_condition) {
269 case 1: __asan_report_load1(0); break;
270 case 2: __asan_report_load2(0); break;
271 case 3: __asan_report_load4(0); break;
272 case 4: __asan_report_load8(0); break;
273 case 5: __asan_report_load16(0); break;
274 case 6: __asan_report_load_n(0, 0); break;
275 case 7: __asan_report_store1(0); break;
276 case 8: __asan_report_store2(0); break;
277 case 9: __asan_report_store4(0); break;
278 case 10: __asan_report_store8(0); break;
279 case 11: __asan_report_store16(0); break;
280 case 12: __asan_report_store_n(0, 0); break;
281 case 13: __asan_report_exp_load1(0, 0); break;
282 case 14: __asan_report_exp_load2(0, 0); break;
283 case 15: __asan_report_exp_load4(0, 0); break;
284 case 16: __asan_report_exp_load8(0, 0); break;
285 case 17: __asan_report_exp_load16(0, 0); break;
286 case 18: __asan_report_exp_load_n(0, 0, 0); break;
287 case 19: __asan_report_exp_store1(0, 0); break;
288 case 20: __asan_report_exp_store2(0, 0); break;
289 case 21: __asan_report_exp_store4(0, 0); break;
290 case 22: __asan_report_exp_store8(0, 0); break;
291 case 23: __asan_report_exp_store16(0, 0); break;
292 case 24: __asan_report_exp_store_n(0, 0, 0); break;
293 case 25: __asan_register_globals(nullptr, 0); break;
294 case 26: __asan_unregister_globals(nullptr, 0); break;
295 case 27: __asan_set_death_callback(nullptr); break;
296 case 28: __asan_set_error_report_callback(nullptr); break;
297 case 29: __asan_handle_no_return(); break;
298 case 30: __asan_address_is_poisoned(nullptr); break;
299 case 31: __asan_poison_memory_region(nullptr, 0); break;
300 case 32: __asan_unpoison_memory_region(nullptr, 0); break;
301 case 34: __asan_before_dynamic_init(nullptr); break;
302 case 35: __asan_after_dynamic_init(); break;
303 case 36: __asan_poison_stack_memory(0, 0); break;
304 case 37: __asan_unpoison_stack_memory(0, 0); break;
305 case 38: __asan_region_is_poisoned(0, 0); break;
306 case 39: __asan_describe_address(0); break;
307 case 40: __asan_set_shadow_00(0, 0); break;
308 case 41: __asan_set_shadow_f1(0, 0); break;
309 case 42: __asan_set_shadow_f2(0, 0); break;
310 case 43: __asan_set_shadow_f3(0, 0); break;
311 case 44: __asan_set_shadow_f5(0, 0); break;
312 case 45: __asan_set_shadow_f8(0, 0); break;
317 static void asan_atexit() {
318 Printf("AddressSanitizer exit stats:\n");
319 __asan_print_accumulated_stats();
320 // Print AsanMappingProfile.
321 for (uptr i = 0; i < kAsanMappingProfileSize; i++) {
322 if (AsanMappingProfile[i] == 0) continue;
323 Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]);
327 static void InitializeHighMemEnd() {
328 #if !ASAN_FIXED_MAPPING
329 kHighMemEnd = GetMaxVirtualAddress();
330 // Increase kHighMemEnd to make sure it's properly
331 // aligned together with kHighMemBeg:
332 kHighMemEnd |= SHADOW_GRANULARITY * GetMmapGranularity() - 1;
333 #endif // !ASAN_FIXED_MAPPING
334 CHECK_EQ((kHighMemBeg % GetMmapGranularity()), 0);
337 static void ProtectGap(uptr addr, uptr size) {
338 if (!flags()->protect_shadow_gap) {
339 // The shadow gap is unprotected, so there is a chance that someone
340 // is actually using this memory. Which means it needs a shadow...
341 uptr GapShadowBeg = RoundDownTo(MEM_TO_SHADOW(addr), GetPageSizeCached());
343 RoundUpTo(MEM_TO_SHADOW(addr + size), GetPageSizeCached()) - 1;
345 Printf("protect_shadow_gap=0:"
346 " not protecting shadow gap, allocating gap's shadow\n"
347 "|| `[%p, %p]` || ShadowGap's shadow ||\n", GapShadowBeg,
349 ReserveShadowMemoryRange(GapShadowBeg, GapShadowEnd,
350 "unprotected gap shadow");
353 void *res = MmapFixedNoAccess(addr, size, "shadow gap");
354 if (addr == (uptr)res)
356 // A few pages at the start of the address space can not be protected.
357 // But we really want to protect as much as possible, to prevent this memory
358 // being returned as a result of a non-FIXED mmap().
359 if (addr == kZeroBaseShadowStart) {
360 uptr step = GetMmapGranularity();
361 while (size > step && addr < kZeroBaseMaxShadowStart) {
364 void *res = MmapFixedNoAccess(addr, size, "shadow gap");
365 if (addr == (uptr)res)
370 Report("ERROR: Failed to protect the shadow gap. "
371 "ASan cannot proceed correctly. ABORTING.\n");
376 static void PrintAddressSpaceLayout() {
377 Printf("|| `[%p, %p]` || HighMem ||\n",
378 (void*)kHighMemBeg, (void*)kHighMemEnd);
379 Printf("|| `[%p, %p]` || HighShadow ||\n",
380 (void*)kHighShadowBeg, (void*)kHighShadowEnd);
382 Printf("|| `[%p, %p]` || ShadowGap3 ||\n",
383 (void*)kShadowGap3Beg, (void*)kShadowGap3End);
384 Printf("|| `[%p, %p]` || MidMem ||\n",
385 (void*)kMidMemBeg, (void*)kMidMemEnd);
386 Printf("|| `[%p, %p]` || ShadowGap2 ||\n",
387 (void*)kShadowGap2Beg, (void*)kShadowGap2End);
388 Printf("|| `[%p, %p]` || MidShadow ||\n",
389 (void*)kMidShadowBeg, (void*)kMidShadowEnd);
391 Printf("|| `[%p, %p]` || ShadowGap ||\n",
392 (void*)kShadowGapBeg, (void*)kShadowGapEnd);
394 Printf("|| `[%p, %p]` || LowShadow ||\n",
395 (void*)kLowShadowBeg, (void*)kLowShadowEnd);
396 Printf("|| `[%p, %p]` || LowMem ||\n",
397 (void*)kLowMemBeg, (void*)kLowMemEnd);
399 Printf("MemToShadow(shadow): %p %p %p %p",
400 (void*)MEM_TO_SHADOW(kLowShadowBeg),
401 (void*)MEM_TO_SHADOW(kLowShadowEnd),
402 (void*)MEM_TO_SHADOW(kHighShadowBeg),
403 (void*)MEM_TO_SHADOW(kHighShadowEnd));
406 (void*)MEM_TO_SHADOW(kMidShadowBeg),
407 (void*)MEM_TO_SHADOW(kMidShadowEnd));
410 Printf("redzone=%zu\n", (uptr)flags()->redzone);
411 Printf("max_redzone=%zu\n", (uptr)flags()->max_redzone);
412 Printf("quarantine_size_mb=%zuM\n", (uptr)flags()->quarantine_size_mb);
413 Printf("thread_local_quarantine_size_kb=%zuK\n",
414 (uptr)flags()->thread_local_quarantine_size_kb);
415 Printf("malloc_context_size=%zu\n",
416 (uptr)common_flags()->malloc_context_size);
418 Printf("SHADOW_SCALE: %d\n", (int)SHADOW_SCALE);
419 Printf("SHADOW_GRANULARITY: %d\n", (int)SHADOW_GRANULARITY);
420 Printf("SHADOW_OFFSET: 0x%zx\n", (uptr)SHADOW_OFFSET);
421 CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7);
423 CHECK(kMidShadowBeg > kLowShadowEnd &&
424 kMidMemBeg > kMidShadowEnd &&
425 kHighShadowBeg > kMidMemEnd);
428 static void InitializeShadowMemory() {
429 // Set the shadow memory address to uninitialized.
430 __asan_shadow_memory_dynamic_address = kDefaultShadowSentinel;
432 uptr shadow_start = kLowShadowBeg;
433 // Detect if a dynamic shadow address must used and find a available location
434 // when necessary. When dynamic address is used, the macro |kLowShadowBeg|
435 // expands to |__asan_shadow_memory_dynamic_address| which is
436 // |kDefaultShadowSentinel|.
437 if (shadow_start == kDefaultShadowSentinel) {
438 __asan_shadow_memory_dynamic_address = 0;
439 CHECK_EQ(0, kLowShadowBeg);
441 uptr granularity = GetMmapGranularity();
442 uptr alignment = 8 * granularity;
443 uptr left_padding = granularity;
444 uptr space_size = kHighShadowEnd + left_padding;
446 shadow_start = FindAvailableMemoryRange(space_size, alignment, granularity);
447 CHECK_NE((uptr)0, shadow_start);
448 CHECK(IsAligned(shadow_start, alignment));
450 // Update the shadow memory address (potentially) used by instrumentation.
451 __asan_shadow_memory_dynamic_address = shadow_start;
454 shadow_start -= GetMmapGranularity();
455 bool full_shadow_is_available =
456 MemoryRangeIsAvailable(shadow_start, kHighShadowEnd);
458 #if SANITIZER_LINUX && defined(__x86_64__) && defined(_LP64) && \
460 if (!full_shadow_is_available) {
461 kMidMemBeg = kLowMemEnd < 0x3000000000ULL ? 0x3000000000ULL : 0;
462 kMidMemEnd = kLowMemEnd < 0x3000000000ULL ? 0x4fffffffffULL : 0;
466 if (Verbosity()) PrintAddressSpaceLayout();
468 if (full_shadow_is_available) {
469 // mmap the low shadow plus at least one page at the left.
471 ReserveShadowMemoryRange(shadow_start, kLowShadowEnd, "low shadow");
472 // mmap the high shadow.
473 ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd, "high shadow");
475 ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
476 CHECK_EQ(kShadowGapEnd, kHighShadowBeg - 1);
477 } else if (kMidMemBeg &&
478 MemoryRangeIsAvailable(shadow_start, kMidMemBeg - 1) &&
479 MemoryRangeIsAvailable(kMidMemEnd + 1, kHighShadowEnd)) {
480 CHECK(kLowShadowBeg != kLowShadowEnd);
481 // mmap the low shadow plus at least one page at the left.
482 ReserveShadowMemoryRange(shadow_start, kLowShadowEnd, "low shadow");
483 // mmap the mid shadow.
484 ReserveShadowMemoryRange(kMidShadowBeg, kMidShadowEnd, "mid shadow");
485 // mmap the high shadow.
486 ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd, "high shadow");
488 ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
489 ProtectGap(kShadowGap2Beg, kShadowGap2End - kShadowGap2Beg + 1);
490 ProtectGap(kShadowGap3Beg, kShadowGap3End - kShadowGap3Beg + 1);
492 Report("Shadow memory range interleaves with an existing memory mapping. "
493 "ASan cannot proceed correctly. ABORTING.\n");
494 Report("ASan shadow was supposed to be located in the [%p-%p] range.\n",
495 shadow_start, kHighShadowEnd);
501 static void AsanInitInternal() {
502 if (LIKELY(asan_inited)) return;
503 SanitizerToolName = "AddressSanitizer";
504 CHECK(!asan_init_is_running && "ASan init calls itself!");
505 asan_init_is_running = true;
509 // Initialize flags. This must be done early, because most of the
510 // initialization steps look at flags().
513 AsanCheckIncompatibleRT();
514 AsanCheckDynamicRTPrereqs();
515 AvoidCVE_2016_2143();
517 SetCanPoisonMemory(flags()->poison_heap);
518 SetMallocContextSize(common_flags()->malloc_context_size);
520 InitializePlatformExceptionHandlers();
522 InitializeHighMemEnd();
524 // Make sure we are not statically linked.
525 AsanDoesNotSupportStaticLinkage();
527 // Install tool-specific callbacks in sanitizer_common.
528 AddDieCallback(AsanDie);
529 SetCheckFailedCallback(AsanCheckFailed);
530 SetPrintfAndReportCallback(AppendToErrorMessageBuffer);
532 __sanitizer_set_report_path(common_flags()->log_path);
534 __asan_option_detect_stack_use_after_return =
535 flags()->detect_stack_use_after_return;
537 // Re-exec ourselves if we need to set additional env or command line args.
540 // Setup internal allocator callback.
541 SetLowLevelAllocateCallback(OnLowLevelAllocate);
543 InitializeAsanInterceptors();
545 // Enable system log ("adb logcat") on Android.
546 // Doing this before interceptors are initialized crashes in:
547 // AsanInitInternal -> android_log_write -> __interceptor_strcmp
550 ReplaceSystemMalloc();
552 DisableCoreDumperIfNecessary();
554 InitializeShadowMemory();
556 AsanTSDInit(PlatformTSDDtor);
557 InstallDeadlySignalHandlers(AsanOnDeadlySignal);
559 AllocatorOptions allocator_options;
560 allocator_options.SetFrom(flags(), common_flags());
561 InitializeAllocator(allocator_options);
563 MaybeStartBackgroudThread();
564 SetSoftRssLimitExceededCallback(AsanSoftRssLimitExceededCallback);
566 // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
567 // should be set to 1 prior to initializing the threads.
569 asan_init_is_running = false;
574 InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
576 // Now that ASan runtime is (mostly) initialized, deactivate it if
577 // necessary, so that it can be re-activated when requested.
578 if (flags()->start_deactivated)
584 // Create main thread.
585 AsanThread *main_thread = AsanThread::Create(
586 /* start_routine */ nullptr, /* arg */ nullptr, /* parent_tid */ 0,
587 /* stack */ nullptr, /* detached */ true);
588 CHECK_EQ(0, main_thread->tid());
589 SetCurrentThread(main_thread);
590 main_thread->ThreadStart(internal_getpid(),
591 /* signal_thread_is_registered */ nullptr);
592 force_interface_symbols(); // no-op.
593 SanitizerInitializeUnwinder();
595 if (CAN_SANITIZE_LEAKS) {
596 __lsan::InitCommonLsan();
597 if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) {
598 Atexit(__lsan::DoLeakCheck);
603 __ubsan::InitAsPlugin();
606 InitializeSuppressions();
608 if (CAN_SANITIZE_LEAKS) {
609 // LateInitialize() calls dlsym, which can allocate an error string buffer
610 // in the TLS. Let's ignore the allocation to avoid reporting a leak.
611 __lsan::ScopedInterceptorDisabler disabler;
612 Symbolizer::LateInitialize();
614 Symbolizer::LateInitialize();
617 VReport(1, "AddressSanitizer Init done\n");
620 // Initialize as requested from some part of ASan runtime library (interceptors,
622 void AsanInitFromRtl() {
627 // Initialize runtime in case it's LD_PRELOAD-ed into unsanitized executable
628 // (and thus normal initializers from .preinit_array or modules haven't run).
630 class AsanInitializer {
637 static AsanInitializer asan_initializer;
638 #endif // ASAN_DYNAMIC
640 } // namespace __asan
642 // ---------------------- Interface ---------------- {{{1
643 using namespace __asan; // NOLINT
645 void NOINLINE __asan_handle_no_return() {
646 if (asan_init_is_running)
650 AsanThread *curr_thread = GetCurrentThread();
651 uptr PageSize = GetPageSizeCached();
654 top = curr_thread->stack_top();
655 bottom = ((uptr)&local_stack - PageSize) & ~(PageSize - 1);
657 // If we haven't seen this thread, try asking the OS for stack bounds.
658 uptr tls_addr, tls_size, stack_size;
659 GetThreadStackAndTls(/*main=*/false, &bottom, &stack_size, &tls_addr,
661 top = bottom + stack_size;
663 static const uptr kMaxExpectedCleanupSize = 64 << 20; // 64M
664 if (top - bottom > kMaxExpectedCleanupSize) {
665 static bool reported_warning = false;
666 if (reported_warning)
668 reported_warning = true;
669 Report("WARNING: ASan is ignoring requested __asan_handle_no_return: "
670 "stack top: %p; bottom %p; size: %p (%zd)\n"
671 "False positive error reports may follow\n"
673 "https://github.com/google/sanitizers/issues/189\n",
674 top, bottom, top - bottom, top - bottom);
677 PoisonShadow(bottom, top - bottom, 0);
678 if (curr_thread && curr_thread->has_fake_stack())
679 curr_thread->fake_stack()->HandleNoReturn();
682 void NOINLINE __asan_set_death_callback(void (*callback)(void)) {
683 SetUserDieCallback(callback);
686 // Initialize as requested from instrumented application code.
687 // We use this call as a trigger to wake up ASan from deactivated state.
693 void __asan_version_mismatch_check() {