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//===-- asan_rtl.cpp ------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of AddressSanitizer, an address sanity checker.
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//
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// Main file of the ASan run-time library.
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//===----------------------------------------------------------------------===//
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#include "asan_activation.h"
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#include "asan_allocator.h"
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#include "asan_fake_stack.h"
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#include "asan_interceptors.h"
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#include "asan_interface_internal.h"
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#include "asan_internal.h"
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#include "asan_mapping.h"
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#include "asan_poisoning.h"
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#include "asan_report.h"
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#include "asan_stack.h"
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#include "asan_stats.h"
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#include "asan_suppressions.h"
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#include "asan_thread.h"
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#include "lsan/lsan_common.h"
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#include "sanitizer_common/sanitizer_atomic.h"
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#include "sanitizer_common/sanitizer_flags.h"
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#include "sanitizer_common/sanitizer_interface_internal.h"
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#include "sanitizer_common/sanitizer_libc.h"
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#include "sanitizer_common/sanitizer_symbolizer.h"
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#include "ubsan/ubsan_init.h"
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#include "ubsan/ubsan_platform.h"
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uptr __asan_shadow_memory_dynamic_address;  // Global interface symbol.
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int __asan_option_detect_stack_use_after_return;  // Global interface symbol.
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uptr *__asan_test_only_reported_buggy_pointer;  // Used only for testing asan.
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namespace __asan {
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uptr AsanMappingProfile[kAsanMappingProfileSize];
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static void AsanDie() {
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  static atomic_uint32_t num_calls;
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  if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) {
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    // Don't die twice - run a busy loop.
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    while (1) {
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      internal_sched_yield();
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    }
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  }
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  if (common_flags()->print_module_map >= 1)
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    DumpProcessMap();
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  WaitForDebugger(flags()->sleep_before_dying, "before dying");
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  if (flags()->unmap_shadow_on_exit) {
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    if (kMidMemBeg) {
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      UnmapOrDie((void*)kLowShadowBeg, kMidMemBeg - kLowShadowBeg);
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      UnmapOrDie((void*)kMidMemEnd, kHighShadowEnd - kMidMemEnd);
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    } else {
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      if (kHighShadowEnd)
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        UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg);
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    }
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  }
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}
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static void CheckUnwind() {
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  GET_STACK_TRACE(kStackTraceMax, common_flags()->fast_unwind_on_check);
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  stack.Print();
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}
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// -------------------------- Globals --------------------- {{{1
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static StaticSpinMutex asan_inited_mutex;
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static atomic_uint8_t asan_inited = {0};
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static void SetAsanInited() {
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  atomic_store(&asan_inited, 1, memory_order_release);
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}
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bool AsanInited() {
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  return atomic_load(&asan_inited, memory_order_acquire) == 1;
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}
84

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bool replace_intrin_cached;
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87
#if !ASAN_FIXED_MAPPING
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uptr kHighMemEnd, kMidMemBeg, kMidMemEnd;
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#endif
90

91
// -------------------------- Misc ---------------- {{{1
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void ShowStatsAndAbort() {
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  __asan_print_accumulated_stats();
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  Die();
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}
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NOINLINE
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static void ReportGenericErrorWrapper(uptr addr, bool is_write, int size,
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                                      int exp_arg, bool fatal) {
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  GET_CALLER_PC_BP_SP;
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  ReportGenericError(pc, bp, sp, addr, is_write, size, exp_arg, fatal);
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}
103

104
// --------------- LowLevelAllocateCallbac ---------- {{{1
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static void OnLowLevelAllocate(uptr ptr, uptr size) {
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  PoisonShadow(ptr, size, kAsanInternalHeapMagic);
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}
108

109
// -------------------------- Run-time entry ------------------- {{{1
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// exported functions
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#define ASAN_REPORT_ERROR(type, is_write, size)                     \
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extern "C" NOINLINE INTERFACE_ATTRIBUTE                             \
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void __asan_report_ ## type ## size(uptr addr) {                    \
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  GET_CALLER_PC_BP_SP;                                              \
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  ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true);    \
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}                                                                   \
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extern "C" NOINLINE INTERFACE_ATTRIBUTE                             \
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void __asan_report_exp_ ## type ## size(uptr addr, u32 exp) {       \
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  GET_CALLER_PC_BP_SP;                                              \
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  ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true);  \
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}                                                                   \
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extern "C" NOINLINE INTERFACE_ATTRIBUTE                             \
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void __asan_report_ ## type ## size ## _noabort(uptr addr) {        \
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  GET_CALLER_PC_BP_SP;                                              \
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  ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false);   \
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}                                                                   \
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ASAN_REPORT_ERROR(load, false, 1)
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ASAN_REPORT_ERROR(load, false, 2)
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ASAN_REPORT_ERROR(load, false, 4)
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ASAN_REPORT_ERROR(load, false, 8)
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ASAN_REPORT_ERROR(load, false, 16)
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ASAN_REPORT_ERROR(store, true, 1)
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ASAN_REPORT_ERROR(store, true, 2)
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ASAN_REPORT_ERROR(store, true, 4)
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ASAN_REPORT_ERROR(store, true, 8)
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ASAN_REPORT_ERROR(store, true, 16)
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139
#define ASAN_REPORT_ERROR_N(type, is_write)                                 \
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extern "C" NOINLINE INTERFACE_ATTRIBUTE                                     \
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void __asan_report_ ## type ## _n(uptr addr, uptr size) {                   \
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  GET_CALLER_PC_BP_SP;                                                      \
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  ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true);            \
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}                                                                           \
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extern "C" NOINLINE INTERFACE_ATTRIBUTE                                     \
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void __asan_report_exp_ ## type ## _n(uptr addr, uptr size, u32 exp) {      \
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  GET_CALLER_PC_BP_SP;                                                      \
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  ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true);          \
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}                                                                           \
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extern "C" NOINLINE INTERFACE_ATTRIBUTE                                     \
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void __asan_report_ ## type ## _n_noabort(uptr addr, uptr size) {           \
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  GET_CALLER_PC_BP_SP;                                                      \
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  ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false);           \
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}                                                                           \
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ASAN_REPORT_ERROR_N(load, false)
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ASAN_REPORT_ERROR_N(store, true)
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#define ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp_arg, fatal) \
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  uptr sp = MEM_TO_SHADOW(addr);                                               \
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  uptr s = size <= ASAN_SHADOW_GRANULARITY ? *reinterpret_cast<u8 *>(sp)       \
162
                                           : *reinterpret_cast<u16 *>(sp);     \
163
  if (UNLIKELY(s)) {                                                           \
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    if (UNLIKELY(size >= ASAN_SHADOW_GRANULARITY ||                            \
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                 ((s8)((addr & (ASAN_SHADOW_GRANULARITY - 1)) + size - 1)) >=  \
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                     (s8)s)) {                                                 \
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      ReportGenericErrorWrapper(addr, is_write, size, exp_arg, fatal);         \
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    }                                                                          \
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  }
170

171
#define ASAN_MEMORY_ACCESS_CALLBACK(type, is_write, size)                      \
172
  extern "C" NOINLINE INTERFACE_ATTRIBUTE                                      \
173
  void __asan_##type##size(uptr addr) {                                        \
174
    ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, true)            \
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  }                                                                            \
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  extern "C" NOINLINE INTERFACE_ATTRIBUTE                                      \
177
  void __asan_exp_##type##size(uptr addr, u32 exp) {                           \
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    ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp, true)          \
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  }                                                                            \
180
  extern "C" NOINLINE INTERFACE_ATTRIBUTE                                      \
181
  void __asan_##type##size ## _noabort(uptr addr) {                            \
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    ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, false)           \
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  }                                                                            \
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ASAN_MEMORY_ACCESS_CALLBACK(load, false, 1)
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ASAN_MEMORY_ACCESS_CALLBACK(load, false, 2)
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ASAN_MEMORY_ACCESS_CALLBACK(load, false, 4)
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ASAN_MEMORY_ACCESS_CALLBACK(load, false, 8)
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ASAN_MEMORY_ACCESS_CALLBACK(load, false, 16)
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ASAN_MEMORY_ACCESS_CALLBACK(store, true, 1)
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ASAN_MEMORY_ACCESS_CALLBACK(store, true, 2)
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ASAN_MEMORY_ACCESS_CALLBACK(store, true, 4)
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ASAN_MEMORY_ACCESS_CALLBACK(store, true, 8)
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ASAN_MEMORY_ACCESS_CALLBACK(store, true, 16)
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196
extern "C"
197
NOINLINE INTERFACE_ATTRIBUTE
198
void __asan_loadN(uptr addr, uptr size) {
199
  if ((addr = __asan_region_is_poisoned(addr, size))) {
200
    GET_CALLER_PC_BP_SP;
201
    ReportGenericError(pc, bp, sp, addr, false, size, 0, true);
202
  }
203
}
204

205
extern "C"
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NOINLINE INTERFACE_ATTRIBUTE
207
void __asan_exp_loadN(uptr addr, uptr size, u32 exp) {
208
  if ((addr = __asan_region_is_poisoned(addr, size))) {
209
    GET_CALLER_PC_BP_SP;
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    ReportGenericError(pc, bp, sp, addr, false, size, exp, true);
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  }
212
}
213

214
extern "C"
215
NOINLINE INTERFACE_ATTRIBUTE
216
void __asan_loadN_noabort(uptr addr, uptr size) {
217
  if ((addr = __asan_region_is_poisoned(addr, size))) {
218
    GET_CALLER_PC_BP_SP;
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    ReportGenericError(pc, bp, sp, addr, false, size, 0, false);
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  }
221
}
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223
extern "C"
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NOINLINE INTERFACE_ATTRIBUTE
225
void __asan_storeN(uptr addr, uptr size) {
226
  if ((addr = __asan_region_is_poisoned(addr, size))) {
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    GET_CALLER_PC_BP_SP;
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    ReportGenericError(pc, bp, sp, addr, true, size, 0, true);
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  }
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}
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232
extern "C"
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NOINLINE INTERFACE_ATTRIBUTE
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void __asan_exp_storeN(uptr addr, uptr size, u32 exp) {
235
  if ((addr = __asan_region_is_poisoned(addr, size))) {
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    GET_CALLER_PC_BP_SP;
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    ReportGenericError(pc, bp, sp, addr, true, size, exp, true);
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  }
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}
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241
extern "C"
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NOINLINE INTERFACE_ATTRIBUTE
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void __asan_storeN_noabort(uptr addr, uptr size) {
244
  if ((addr = __asan_region_is_poisoned(addr, size))) {
245
    GET_CALLER_PC_BP_SP;
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    ReportGenericError(pc, bp, sp, addr, true, size, 0, false);
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  }
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}
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// Force the linker to keep the symbols for various ASan interface functions.
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// We want to keep those in the executable in order to let the instrumented
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// dynamic libraries access the symbol even if it is not used by the executable
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// itself. This should help if the build system is removing dead code at link
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// time.
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static NOINLINE void force_interface_symbols() {
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  volatile int fake_condition = 0;  // prevent dead condition elimination.
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  // __asan_report_* functions are noreturn, so we need a switch to prevent
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  // the compiler from removing any of them.
259
  // clang-format off
260
  switch (fake_condition) {
261
    case 1: __asan_report_load1(0); break;
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    case 2: __asan_report_load2(0); break;
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    case 3: __asan_report_load4(0); break;
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    case 4: __asan_report_load8(0); break;
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    case 5: __asan_report_load16(0); break;
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    case 6: __asan_report_load_n(0, 0); break;
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    case 7: __asan_report_store1(0); break;
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    case 8: __asan_report_store2(0); break;
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    case 9: __asan_report_store4(0); break;
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    case 10: __asan_report_store8(0); break;
271
    case 11: __asan_report_store16(0); break;
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    case 12: __asan_report_store_n(0, 0); break;
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    case 13: __asan_report_exp_load1(0, 0); break;
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    case 14: __asan_report_exp_load2(0, 0); break;
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    case 15: __asan_report_exp_load4(0, 0); break;
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    case 16: __asan_report_exp_load8(0, 0); break;
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    case 17: __asan_report_exp_load16(0, 0); break;
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    case 18: __asan_report_exp_load_n(0, 0, 0); break;
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    case 19: __asan_report_exp_store1(0, 0); break;
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    case 20: __asan_report_exp_store2(0, 0); break;
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    case 21: __asan_report_exp_store4(0, 0); break;
282
    case 22: __asan_report_exp_store8(0, 0); break;
283
    case 23: __asan_report_exp_store16(0, 0); break;
284
    case 24: __asan_report_exp_store_n(0, 0, 0); break;
285
    case 25: __asan_register_globals(nullptr, 0); break;
286
    case 26: __asan_unregister_globals(nullptr, 0); break;
287
    case 27: __asan_set_death_callback(nullptr); break;
288
    case 28: __asan_set_error_report_callback(nullptr); break;
289
    case 29: __asan_handle_no_return(); break;
290
    case 30: __asan_address_is_poisoned(nullptr); break;
291
    case 31: __asan_poison_memory_region(nullptr, 0); break;
292
    case 32: __asan_unpoison_memory_region(nullptr, 0); break;
293
    case 34: __asan_before_dynamic_init(nullptr); break;
294
    case 35: __asan_after_dynamic_init(); break;
295
    case 36: __asan_poison_stack_memory(0, 0); break;
296
    case 37: __asan_unpoison_stack_memory(0, 0); break;
297
    case 38: __asan_region_is_poisoned(0, 0); break;
298
    case 39: __asan_describe_address(0); break;
299
    case 40: __asan_set_shadow_00(0, 0); break;
300
    case 41: __asan_set_shadow_01(0, 0); break;
301
    case 42: __asan_set_shadow_02(0, 0); break;
302
    case 43: __asan_set_shadow_03(0, 0); break;
303
    case 44: __asan_set_shadow_04(0, 0); break;
304
    case 45: __asan_set_shadow_05(0, 0); break;
305
    case 46: __asan_set_shadow_06(0, 0); break;
306
    case 47: __asan_set_shadow_07(0, 0); break;
307
    case 48: __asan_set_shadow_f1(0, 0); break;
308
    case 49: __asan_set_shadow_f2(0, 0); break;
309
    case 50: __asan_set_shadow_f3(0, 0); break;
310
    case 51: __asan_set_shadow_f5(0, 0); break;
311
    case 52: __asan_set_shadow_f8(0, 0); break;
312
  }
313
  // clang-format on
314
}
315

316
static void asan_atexit() {
317
  Printf("AddressSanitizer exit stats:\n");
318
  __asan_print_accumulated_stats();
319
  // Print AsanMappingProfile.
320
  for (uptr i = 0; i < kAsanMappingProfileSize; i++) {
321
    if (AsanMappingProfile[i] == 0) continue;
322
    Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]);
323
  }
324
}
325

326
static void InitializeHighMemEnd() {
327
#if !ASAN_FIXED_MAPPING
328
  kHighMemEnd = GetMaxUserVirtualAddress();
329
  // Increase kHighMemEnd to make sure it's properly
330
  // aligned together with kHighMemBeg:
331
  kHighMemEnd |= (GetMmapGranularity() << ASAN_SHADOW_SCALE) - 1;
332
#endif  // !ASAN_FIXED_MAPPING
333
  CHECK_EQ((kHighMemBeg % GetMmapGranularity()), 0);
334
}
335

336
void PrintAddressSpaceLayout() {
337
  if (kHighMemBeg) {
338
    Printf("|| `[%p, %p]` || HighMem    ||\n",
339
           (void*)kHighMemBeg, (void*)kHighMemEnd);
340
    Printf("|| `[%p, %p]` || HighShadow ||\n",
341
           (void*)kHighShadowBeg, (void*)kHighShadowEnd);
342
  }
343
  if (kMidMemBeg) {
344
    Printf("|| `[%p, %p]` || ShadowGap3 ||\n",
345
           (void*)kShadowGap3Beg, (void*)kShadowGap3End);
346
    Printf("|| `[%p, %p]` || MidMem     ||\n",
347
           (void*)kMidMemBeg, (void*)kMidMemEnd);
348
    Printf("|| `[%p, %p]` || ShadowGap2 ||\n",
349
           (void*)kShadowGap2Beg, (void*)kShadowGap2End);
350
    Printf("|| `[%p, %p]` || MidShadow  ||\n",
351
           (void*)kMidShadowBeg, (void*)kMidShadowEnd);
352
  }
353
  Printf("|| `[%p, %p]` || ShadowGap  ||\n",
354
         (void*)kShadowGapBeg, (void*)kShadowGapEnd);
355
  if (kLowShadowBeg) {
356
    Printf("|| `[%p, %p]` || LowShadow  ||\n",
357
           (void*)kLowShadowBeg, (void*)kLowShadowEnd);
358
    Printf("|| `[%p, %p]` || LowMem     ||\n",
359
           (void*)kLowMemBeg, (void*)kLowMemEnd);
360
  }
361
  Printf("MemToShadow(shadow): %p %p",
362
         (void*)MEM_TO_SHADOW(kLowShadowBeg),
363
         (void*)MEM_TO_SHADOW(kLowShadowEnd));
364
  if (kHighMemBeg) {
365
    Printf(" %p %p",
366
           (void*)MEM_TO_SHADOW(kHighShadowBeg),
367
           (void*)MEM_TO_SHADOW(kHighShadowEnd));
368
  }
369
  if (kMidMemBeg) {
370
    Printf(" %p %p",
371
           (void*)MEM_TO_SHADOW(kMidShadowBeg),
372
           (void*)MEM_TO_SHADOW(kMidShadowEnd));
373
  }
374
  Printf("\n");
375
  Printf("redzone=%zu\n", (uptr)flags()->redzone);
376
  Printf("max_redzone=%zu\n", (uptr)flags()->max_redzone);
377
  Printf("quarantine_size_mb=%zuM\n", (uptr)flags()->quarantine_size_mb);
378
  Printf("thread_local_quarantine_size_kb=%zuK\n",
379
         (uptr)flags()->thread_local_quarantine_size_kb);
380
  Printf("malloc_context_size=%zu\n",
381
         (uptr)common_flags()->malloc_context_size);
382

383
  Printf("SHADOW_SCALE: %d\n", (int)ASAN_SHADOW_SCALE);
384
  Printf("SHADOW_GRANULARITY: %d\n", (int)ASAN_SHADOW_GRANULARITY);
385
  Printf("SHADOW_OFFSET: 0x%zx\n", (uptr)ASAN_SHADOW_OFFSET);
386
  CHECK(ASAN_SHADOW_SCALE >= 3 && ASAN_SHADOW_SCALE <= 7);
387
  if (kMidMemBeg)
388
    CHECK(kMidShadowBeg > kLowShadowEnd &&
389
          kMidMemBeg > kMidShadowEnd &&
390
          kHighShadowBeg > kMidMemEnd);
391
}
392

393
static bool AsanInitInternal() {
394
  if (LIKELY(AsanInited()))
395
    return true;
396
  SanitizerToolName = "AddressSanitizer";
397

398
  CacheBinaryName();
399

400
  // Initialize flags. This must be done early, because most of the
401
  // initialization steps look at flags().
402
  InitializeFlags();
403

404
  WaitForDebugger(flags()->sleep_before_init, "before init");
405

406
  // Stop performing init at this point if we are being loaded via
407
  // dlopen() and the platform supports it.
408
  if (SANITIZER_SUPPORTS_INIT_FOR_DLOPEN && UNLIKELY(HandleDlopenInit())) {
409
    VReport(1, "AddressSanitizer init is being performed for dlopen().\n");
410
    return false;
411
  }
412

413
  // Make sure we are not statically linked.
414
  __interception::DoesNotSupportStaticLinking();
415
  AsanCheckIncompatibleRT();
416
  AsanCheckDynamicRTPrereqs();
417
  AvoidCVE_2016_2143();
418

419
  SetCanPoisonMemory(flags()->poison_heap);
420
  SetMallocContextSize(common_flags()->malloc_context_size);
421

422
  InitializePlatformExceptionHandlers();
423

424
  InitializeHighMemEnd();
425

426
  // Install tool-specific callbacks in sanitizer_common.
427
  AddDieCallback(AsanDie);
428
  SetCheckUnwindCallback(CheckUnwind);
429
  SetPrintfAndReportCallback(AppendToErrorMessageBuffer);
430

431
  __sanitizer_set_report_path(common_flags()->log_path);
432

433
  __asan_option_detect_stack_use_after_return =
434
      flags()->detect_stack_use_after_return;
435

436
  __sanitizer::InitializePlatformEarly();
437

438
  // Setup internal allocator callback.
439
  SetLowLevelAllocateMinAlignment(ASAN_SHADOW_GRANULARITY);
440
  SetLowLevelAllocateCallback(OnLowLevelAllocate);
441

442
  InitializeAsanInterceptors();
443
  CheckASLR();
444

445
  // Enable system log ("adb logcat") on Android.
446
  // Doing this before interceptors are initialized crashes in:
447
  // AsanInitInternal -> android_log_write -> __interceptor_strcmp
448
  AndroidLogInit();
449

450
  ReplaceSystemMalloc();
451

452
  DisableCoreDumperIfNecessary();
453

454
  InitializeShadowMemory();
455

456
  AsanTSDInit(PlatformTSDDtor);
457
  InstallDeadlySignalHandlers(AsanOnDeadlySignal);
458

459
  AllocatorOptions allocator_options;
460
  allocator_options.SetFrom(flags(), common_flags());
461
  InitializeAllocator(allocator_options);
462

463
  if (SANITIZER_START_BACKGROUND_THREAD_IN_ASAN_INTERNAL)
464
    MaybeStartBackgroudThread();
465

466
  // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
467
  // should be set to 1 prior to initializing the threads.
468
  replace_intrin_cached = flags()->replace_intrin;
469
  SetAsanInited();
470

471
  if (flags()->atexit)
472
    Atexit(asan_atexit);
473

474
  InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
475

476
  // Now that ASan runtime is (mostly) initialized, deactivate it if
477
  // necessary, so that it can be re-activated when requested.
478
  if (flags()->start_deactivated)
479
    AsanDeactivate();
480

481
  // interceptors
482
  InitTlsSize();
483

484
  // Create main thread.
485
  AsanThread *main_thread = CreateMainThread();
486
  CHECK_EQ(0, main_thread->tid());
487
  force_interface_symbols();  // no-op.
488
  SanitizerInitializeUnwinder();
489

490
  if (CAN_SANITIZE_LEAKS) {
491
    __lsan::InitCommonLsan();
492
    InstallAtExitCheckLeaks();
493
  }
494

495
  InstallAtForkHandler();
496

497
#if CAN_SANITIZE_UB
498
  __ubsan::InitAsPlugin();
499
#endif
500

501
  InitializeSuppressions();
502

503
  if (CAN_SANITIZE_LEAKS) {
504
    // LateInitialize() calls dlsym, which can allocate an error string buffer
505
    // in the TLS.  Let's ignore the allocation to avoid reporting a leak.
506
    __lsan::ScopedInterceptorDisabler disabler;
507
    Symbolizer::LateInitialize();
508
  } else {
509
    Symbolizer::LateInitialize();
510
  }
511

512
  VReport(1, "AddressSanitizer Init done\n");
513

514
  WaitForDebugger(flags()->sleep_after_init, "after init");
515

516
  return true;
517
}
518

519
// Initialize as requested from some part of ASan runtime library (interceptors,
520
// allocator, etc).
521
void AsanInitFromRtl() {
522
  if (LIKELY(AsanInited()))
523
    return;
524
  SpinMutexLock lock(&asan_inited_mutex);
525
  AsanInitInternal();
526
}
527

528
bool TryAsanInitFromRtl() {
529
  if (LIKELY(AsanInited()))
530
    return true;
531
  if (!asan_inited_mutex.TryLock())
532
    return false;
533
  bool result = AsanInitInternal();
534
  asan_inited_mutex.Unlock();
535
  return result;
536
}
537

538
#if ASAN_DYNAMIC
539
// Initialize runtime in case it's LD_PRELOAD-ed into unsanitized executable
540
// (and thus normal initializers from .preinit_array or modules haven't run).
541

542
class AsanInitializer {
543
 public:
544
  AsanInitializer() {
545
    AsanInitFromRtl();
546
  }
547
};
548

549
static AsanInitializer asan_initializer;
550
#endif  // ASAN_DYNAMIC
551

552
void UnpoisonStack(uptr bottom, uptr top, const char *type) {
553
  static const uptr kMaxExpectedCleanupSize = 64 << 20;  // 64M
554
  if (top - bottom > kMaxExpectedCleanupSize) {
555
    static bool reported_warning = false;
556
    if (reported_warning)
557
      return;
558
    reported_warning = true;
559
    Report(
560
        "WARNING: ASan is ignoring requested __asan_handle_no_return: "
561
        "stack type: %s top: %p; bottom %p; size: %p (%zd)\n"
562
        "False positive error reports may follow\n"
563
        "For details see "
564
        "https://github.com/google/sanitizers/issues/189\n",
565
        type, (void *)top, (void *)bottom, (void *)(top - bottom),
566
        top - bottom);
567
    return;
568
  }
569
  PoisonShadow(bottom, RoundUpTo(top - bottom, ASAN_SHADOW_GRANULARITY), 0);
570
}
571

572
static void UnpoisonDefaultStack() {
573
  uptr bottom, top;
574

575
  if (AsanThread *curr_thread = GetCurrentThread()) {
576
    int local_stack;
577
    const uptr page_size = GetPageSizeCached();
578
    top = curr_thread->stack_top();
579
    bottom = ((uptr)&local_stack - page_size) & ~(page_size - 1);
580
  } else {
581
    CHECK(!SANITIZER_FUCHSIA);
582
    // If we haven't seen this thread, try asking the OS for stack bounds.
583
    uptr tls_addr, tls_size, stack_size;
584
    GetThreadStackAndTls(/*main=*/false, &bottom, &stack_size, &tls_addr,
585
                         &tls_size);
586
    top = bottom + stack_size;
587
  }
588

589
  UnpoisonStack(bottom, top, "default");
590
}
591

592
static void UnpoisonFakeStack() {
593
  AsanThread *curr_thread = GetCurrentThread();
594
  if (!curr_thread)
595
    return;
596
  FakeStack *stack = curr_thread->get_fake_stack();
597
  if (!stack)
598
    return;
599
  stack->HandleNoReturn();
600
}
601

602
}  // namespace __asan
603

604
// ---------------------- Interface ---------------- {{{1
605
using namespace __asan;
606

607
void NOINLINE __asan_handle_no_return() {
608
  if (UNLIKELY(!AsanInited()))
609
    return;
610

611
  if (!PlatformUnpoisonStacks())
612
    UnpoisonDefaultStack();
613

614
  UnpoisonFakeStack();
615
}
616

617
extern "C" void *__asan_extra_spill_area() {
618
  AsanThread *t = GetCurrentThread();
619
  CHECK(t);
620
  return t->extra_spill_area();
621
}
622

623
void __asan_handle_vfork(void *sp) {
624
  AsanThread *t = GetCurrentThread();
625
  CHECK(t);
626
  uptr bottom = t->stack_bottom();
627
  PoisonShadow(bottom, (uptr)sp - bottom, 0);
628
}
629

630
void NOINLINE __asan_set_death_callback(void (*callback)(void)) {
631
  SetUserDieCallback(callback);
632
}
633

634
// Initialize as requested from instrumented application code.
635
// We use this call as a trigger to wake up ASan from deactivated state.
636
void __asan_init() {
637
  AsanActivate();
638
  AsanInitFromRtl();
639
}
640

641
void __asan_version_mismatch_check() {
642
  // Do nothing.
643
}
644

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