638 lines
22 KiB
C++
638 lines
22 KiB
C++
//===-- 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_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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}
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if (common_flags()->print_module_map >= 1)
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DumpProcessMap();
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if (flags()->sleep_before_dying) {
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Report("Sleeping for %d second(s)\n", flags()->sleep_before_dying);
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SleepForSeconds(flags()->sleep_before_dying);
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}
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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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int asan_inited;
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bool asan_init_is_running;
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#if !ASAN_FIXED_MAPPING
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uptr kHighMemEnd, kMidMemBeg, kMidMemEnd;
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#endif
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// -------------------------- 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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if (__asan_test_only_reported_buggy_pointer) {
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*__asan_test_only_reported_buggy_pointer = addr;
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} else {
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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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}
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}
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// --------------- 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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}
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// -------------------------- 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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#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 <= SHADOW_GRANULARITY ? *reinterpret_cast<u8 *>(sp) \
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: *reinterpret_cast<u16 *>(sp); \
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if (UNLIKELY(s)) { \
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if (UNLIKELY(size >= SHADOW_GRANULARITY || \
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((s8)((addr & (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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}
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#define ASAN_MEMORY_ACCESS_CALLBACK(type, is_write, size) \
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extern "C" NOINLINE INTERFACE_ATTRIBUTE \
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void __asan_##type##size(uptr addr) { \
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ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, true) \
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} \
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extern "C" NOINLINE INTERFACE_ATTRIBUTE \
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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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} \
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extern "C" NOINLINE INTERFACE_ATTRIBUTE \
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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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extern "C"
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NOINLINE INTERFACE_ATTRIBUTE
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void __asan_loadN(uptr addr, uptr size) {
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if (__asan_region_is_poisoned(addr, size)) {
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GET_CALLER_PC_BP_SP;
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ReportGenericError(pc, bp, sp, addr, false, size, 0, true);
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}
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}
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extern "C"
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NOINLINE INTERFACE_ATTRIBUTE
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void __asan_exp_loadN(uptr addr, uptr size, u32 exp) {
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if (__asan_region_is_poisoned(addr, size)) {
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GET_CALLER_PC_BP_SP;
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ReportGenericError(pc, bp, sp, addr, false, size, exp, true);
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}
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}
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extern "C"
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NOINLINE INTERFACE_ATTRIBUTE
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void __asan_loadN_noabort(uptr addr, uptr size) {
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if (__asan_region_is_poisoned(addr, size)) {
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GET_CALLER_PC_BP_SP;
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ReportGenericError(pc, bp, sp, addr, false, size, 0, false);
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}
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}
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extern "C"
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NOINLINE INTERFACE_ATTRIBUTE
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void __asan_storeN(uptr addr, uptr size) {
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if (__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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extern "C"
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NOINLINE INTERFACE_ATTRIBUTE
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void __asan_exp_storeN(uptr addr, uptr size, u32 exp) {
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if (__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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extern "C"
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NOINLINE INTERFACE_ATTRIBUTE
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void __asan_storeN_noabort(uptr addr, uptr size) {
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if (__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, 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.
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// clang-format off
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switch (fake_condition) {
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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;
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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;
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case 22: __asan_report_exp_store8(0, 0); break;
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case 23: __asan_report_exp_store16(0, 0); break;
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case 24: __asan_report_exp_store_n(0, 0, 0); break;
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case 25: __asan_register_globals(nullptr, 0); break;
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case 26: __asan_unregister_globals(nullptr, 0); break;
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case 27: __asan_set_death_callback(nullptr); break;
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case 28: __asan_set_error_report_callback(nullptr); break;
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case 29: __asan_handle_no_return(); break;
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case 30: __asan_address_is_poisoned(nullptr); break;
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case 31: __asan_poison_memory_region(nullptr, 0); break;
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case 32: __asan_unpoison_memory_region(nullptr, 0); break;
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case 34: __asan_before_dynamic_init(nullptr); break;
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case 35: __asan_after_dynamic_init(); break;
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case 36: __asan_poison_stack_memory(0, 0); break;
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case 37: __asan_unpoison_stack_memory(0, 0); break;
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case 38: __asan_region_is_poisoned(0, 0); break;
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case 39: __asan_describe_address(0); break;
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case 40: __asan_set_shadow_00(0, 0); break;
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case 41: __asan_set_shadow_f1(0, 0); break;
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case 42: __asan_set_shadow_f2(0, 0); break;
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case 43: __asan_set_shadow_f3(0, 0); break;
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case 44: __asan_set_shadow_f5(0, 0); break;
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case 45: __asan_set_shadow_f8(0, 0); break;
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}
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// clang-format on
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}
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static void asan_atexit() {
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Printf("AddressSanitizer exit stats:\n");
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__asan_print_accumulated_stats();
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// Print AsanMappingProfile.
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for (uptr i = 0; i < kAsanMappingProfileSize; i++) {
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if (AsanMappingProfile[i] == 0) continue;
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Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]);
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}
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}
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static void InitializeHighMemEnd() {
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#if !ASAN_FIXED_MAPPING
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kHighMemEnd = GetMaxUserVirtualAddress();
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// Increase kHighMemEnd to make sure it's properly
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// aligned together with kHighMemBeg:
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kHighMemEnd |= (GetMmapGranularity() << SHADOW_SCALE) - 1;
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#endif // !ASAN_FIXED_MAPPING
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CHECK_EQ((kHighMemBeg % GetMmapGranularity()), 0);
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}
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void PrintAddressSpaceLayout() {
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if (kHighMemBeg) {
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Printf("|| `[%p, %p]` || HighMem ||\n",
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(void*)kHighMemBeg, (void*)kHighMemEnd);
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Printf("|| `[%p, %p]` || HighShadow ||\n",
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(void*)kHighShadowBeg, (void*)kHighShadowEnd);
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}
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if (kMidMemBeg) {
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Printf("|| `[%p, %p]` || ShadowGap3 ||\n",
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(void*)kShadowGap3Beg, (void*)kShadowGap3End);
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Printf("|| `[%p, %p]` || MidMem ||\n",
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(void*)kMidMemBeg, (void*)kMidMemEnd);
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Printf("|| `[%p, %p]` || ShadowGap2 ||\n",
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(void*)kShadowGap2Beg, (void*)kShadowGap2End);
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Printf("|| `[%p, %p]` || MidShadow ||\n",
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(void*)kMidShadowBeg, (void*)kMidShadowEnd);
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}
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Printf("|| `[%p, %p]` || ShadowGap ||\n",
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(void*)kShadowGapBeg, (void*)kShadowGapEnd);
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if (kLowShadowBeg) {
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Printf("|| `[%p, %p]` || LowShadow ||\n",
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(void*)kLowShadowBeg, (void*)kLowShadowEnd);
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Printf("|| `[%p, %p]` || LowMem ||\n",
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(void*)kLowMemBeg, (void*)kLowMemEnd);
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}
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Printf("MemToShadow(shadow): %p %p",
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(void*)MEM_TO_SHADOW(kLowShadowBeg),
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(void*)MEM_TO_SHADOW(kLowShadowEnd));
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if (kHighMemBeg) {
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Printf(" %p %p",
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(void*)MEM_TO_SHADOW(kHighShadowBeg),
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(void*)MEM_TO_SHADOW(kHighShadowEnd));
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}
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if (kMidMemBeg) {
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Printf(" %p %p",
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(void*)MEM_TO_SHADOW(kMidShadowBeg),
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(void*)MEM_TO_SHADOW(kMidShadowEnd));
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}
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Printf("\n");
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Printf("redzone=%zu\n", (uptr)flags()->redzone);
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Printf("max_redzone=%zu\n", (uptr)flags()->max_redzone);
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Printf("quarantine_size_mb=%zuM\n", (uptr)flags()->quarantine_size_mb);
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Printf("thread_local_quarantine_size_kb=%zuK\n",
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(uptr)flags()->thread_local_quarantine_size_kb);
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Printf("malloc_context_size=%zu\n",
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(uptr)common_flags()->malloc_context_size);
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Printf("SHADOW_SCALE: %d\n", (int)SHADOW_SCALE);
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Printf("SHADOW_GRANULARITY: %d\n", (int)SHADOW_GRANULARITY);
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Printf("SHADOW_OFFSET: 0x%zx\n", (uptr)SHADOW_OFFSET);
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CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7);
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if (kMidMemBeg)
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CHECK(kMidShadowBeg > kLowShadowEnd &&
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kMidMemBeg > kMidShadowEnd &&
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kHighShadowBeg > kMidMemEnd);
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}
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#if defined(__thumb__) && defined(__linux__)
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#define START_BACKGROUND_THREAD_IN_ASAN_INTERNAL
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#endif
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#ifndef START_BACKGROUND_THREAD_IN_ASAN_INTERNAL
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static bool UNUSED __local_asan_dyninit = [] {
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MaybeStartBackgroudThread();
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SetSoftRssLimitExceededCallback(AsanSoftRssLimitExceededCallback);
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return false;
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}();
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#endif
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static void AsanInitInternal() {
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if (LIKELY(asan_inited)) return;
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SanitizerToolName = "AddressSanitizer";
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CHECK(!asan_init_is_running && "ASan init calls itself!");
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asan_init_is_running = true;
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CacheBinaryName();
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// Initialize flags. This must be done early, because most of the
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// initialization steps look at flags().
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InitializeFlags();
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// Stop performing init at this point if we are being loaded via
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// dlopen() and the platform supports it.
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if (SANITIZER_SUPPORTS_INIT_FOR_DLOPEN && UNLIKELY(HandleDlopenInit())) {
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asan_init_is_running = false;
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VReport(1, "AddressSanitizer init is being performed for dlopen().\n");
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return;
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}
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AsanCheckIncompatibleRT();
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AsanCheckDynamicRTPrereqs();
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AvoidCVE_2016_2143();
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SetCanPoisonMemory(flags()->poison_heap);
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SetMallocContextSize(common_flags()->malloc_context_size);
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|
|
InitializePlatformExceptionHandlers();
|
|
|
|
InitializeHighMemEnd();
|
|
|
|
// Make sure we are not statically linked.
|
|
AsanDoesNotSupportStaticLinkage();
|
|
|
|
// Install tool-specific callbacks in sanitizer_common.
|
|
AddDieCallback(AsanDie);
|
|
SetCheckUnwindCallback(CheckUnwind);
|
|
SetPrintfAndReportCallback(AppendToErrorMessageBuffer);
|
|
|
|
__sanitizer_set_report_path(common_flags()->log_path);
|
|
|
|
__asan_option_detect_stack_use_after_return =
|
|
flags()->detect_stack_use_after_return;
|
|
|
|
__sanitizer::InitializePlatformEarly();
|
|
|
|
// Re-exec ourselves if we need to set additional env or command line args.
|
|
MaybeReexec();
|
|
|
|
// Setup internal allocator callback.
|
|
SetLowLevelAllocateMinAlignment(SHADOW_GRANULARITY);
|
|
SetLowLevelAllocateCallback(OnLowLevelAllocate);
|
|
|
|
InitializeAsanInterceptors();
|
|
CheckASLR();
|
|
|
|
// Enable system log ("adb logcat") on Android.
|
|
// Doing this before interceptors are initialized crashes in:
|
|
// AsanInitInternal -> android_log_write -> __interceptor_strcmp
|
|
AndroidLogInit();
|
|
|
|
ReplaceSystemMalloc();
|
|
|
|
DisableCoreDumperIfNecessary();
|
|
|
|
InitializeShadowMemory();
|
|
|
|
AsanTSDInit(PlatformTSDDtor);
|
|
InstallDeadlySignalHandlers(AsanOnDeadlySignal);
|
|
|
|
AllocatorOptions allocator_options;
|
|
allocator_options.SetFrom(flags(), common_flags());
|
|
InitializeAllocator(allocator_options);
|
|
|
|
#ifdef START_BACKGROUND_THREAD_IN_ASAN_INTERNAL
|
|
MaybeStartBackgroudThread();
|
|
SetSoftRssLimitExceededCallback(AsanSoftRssLimitExceededCallback);
|
|
#endif
|
|
|
|
// On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
|
|
// should be set to 1 prior to initializing the threads.
|
|
asan_inited = 1;
|
|
asan_init_is_running = false;
|
|
|
|
if (flags()->atexit)
|
|
Atexit(asan_atexit);
|
|
|
|
InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
|
|
|
|
// Now that ASan runtime is (mostly) initialized, deactivate it if
|
|
// necessary, so that it can be re-activated when requested.
|
|
if (flags()->start_deactivated)
|
|
AsanDeactivate();
|
|
|
|
// interceptors
|
|
InitTlsSize();
|
|
|
|
// Create main thread.
|
|
AsanThread *main_thread = CreateMainThread();
|
|
CHECK_EQ(0, main_thread->tid());
|
|
force_interface_symbols(); // no-op.
|
|
SanitizerInitializeUnwinder();
|
|
|
|
if (CAN_SANITIZE_LEAKS) {
|
|
__lsan::InitCommonLsan();
|
|
if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) {
|
|
if (flags()->halt_on_error)
|
|
Atexit(__lsan::DoLeakCheck);
|
|
else
|
|
Atexit(__lsan::DoRecoverableLeakCheckVoid);
|
|
}
|
|
}
|
|
|
|
#if CAN_SANITIZE_UB
|
|
__ubsan::InitAsPlugin();
|
|
#endif
|
|
|
|
InitializeSuppressions();
|
|
|
|
if (CAN_SANITIZE_LEAKS) {
|
|
// LateInitialize() calls dlsym, which can allocate an error string buffer
|
|
// in the TLS. Let's ignore the allocation to avoid reporting a leak.
|
|
__lsan::ScopedInterceptorDisabler disabler;
|
|
Symbolizer::LateInitialize();
|
|
} else {
|
|
Symbolizer::LateInitialize();
|
|
}
|
|
|
|
VReport(1, "AddressSanitizer Init done\n");
|
|
|
|
if (flags()->sleep_after_init) {
|
|
Report("Sleeping for %d second(s)\n", flags()->sleep_after_init);
|
|
SleepForSeconds(flags()->sleep_after_init);
|
|
}
|
|
}
|
|
|
|
// Initialize as requested from some part of ASan runtime library (interceptors,
|
|
// allocator, etc).
|
|
void AsanInitFromRtl() {
|
|
AsanInitInternal();
|
|
}
|
|
|
|
#if ASAN_DYNAMIC
|
|
// Initialize runtime in case it's LD_PRELOAD-ed into unsanitized executable
|
|
// (and thus normal initializers from .preinit_array or modules haven't run).
|
|
|
|
class AsanInitializer {
|
|
public:
|
|
AsanInitializer() {
|
|
AsanInitFromRtl();
|
|
}
|
|
};
|
|
|
|
static AsanInitializer asan_initializer;
|
|
#endif // ASAN_DYNAMIC
|
|
|
|
void UnpoisonStack(uptr bottom, uptr top, const char *type) {
|
|
static const uptr kMaxExpectedCleanupSize = 64 << 20; // 64M
|
|
if (top - bottom > kMaxExpectedCleanupSize) {
|
|
static bool reported_warning = false;
|
|
if (reported_warning)
|
|
return;
|
|
reported_warning = true;
|
|
Report(
|
|
"WARNING: ASan is ignoring requested __asan_handle_no_return: "
|
|
"stack type: %s top: %p; bottom %p; size: %p (%zd)\n"
|
|
"False positive error reports may follow\n"
|
|
"For details see "
|
|
"https://github.com/google/sanitizers/issues/189\n",
|
|
type, (void *)top, (void *)bottom, (void *)(top - bottom),
|
|
top - bottom);
|
|
return;
|
|
}
|
|
PoisonShadow(bottom, RoundUpTo(top - bottom, SHADOW_GRANULARITY), 0);
|
|
}
|
|
|
|
static void UnpoisonDefaultStack() {
|
|
uptr bottom, top;
|
|
|
|
if (AsanThread *curr_thread = GetCurrentThread()) {
|
|
int local_stack;
|
|
const uptr page_size = GetPageSizeCached();
|
|
top = curr_thread->stack_top();
|
|
bottom = ((uptr)&local_stack - page_size) & ~(page_size - 1);
|
|
} else {
|
|
CHECK(!SANITIZER_FUCHSIA);
|
|
// If we haven't seen this thread, try asking the OS for stack bounds.
|
|
uptr tls_addr, tls_size, stack_size;
|
|
GetThreadStackAndTls(/*main=*/false, &bottom, &stack_size, &tls_addr,
|
|
&tls_size);
|
|
top = bottom + stack_size;
|
|
}
|
|
|
|
UnpoisonStack(bottom, top, "default");
|
|
}
|
|
|
|
static void UnpoisonFakeStack() {
|
|
AsanThread *curr_thread = GetCurrentThread();
|
|
if (!curr_thread)
|
|
return;
|
|
FakeStack *stack = curr_thread->get_fake_stack();
|
|
if (!stack)
|
|
return;
|
|
stack->HandleNoReturn();
|
|
}
|
|
|
|
} // namespace __asan
|
|
|
|
// ---------------------- Interface ---------------- {{{1
|
|
using namespace __asan;
|
|
|
|
void NOINLINE __asan_handle_no_return() {
|
|
if (asan_init_is_running)
|
|
return;
|
|
|
|
if (!PlatformUnpoisonStacks())
|
|
UnpoisonDefaultStack();
|
|
|
|
UnpoisonFakeStack();
|
|
}
|
|
|
|
extern "C" void *__asan_extra_spill_area() {
|
|
AsanThread *t = GetCurrentThread();
|
|
CHECK(t);
|
|
return t->extra_spill_area();
|
|
}
|
|
|
|
void __asan_handle_vfork(void *sp) {
|
|
AsanThread *t = GetCurrentThread();
|
|
CHECK(t);
|
|
uptr bottom = t->stack_bottom();
|
|
PoisonShadow(bottom, (uptr)sp - bottom, 0);
|
|
}
|
|
|
|
void NOINLINE __asan_set_death_callback(void (*callback)(void)) {
|
|
SetUserDieCallback(callback);
|
|
}
|
|
|
|
// Initialize as requested from instrumented application code.
|
|
// We use this call as a trigger to wake up ASan from deactivated state.
|
|
void __asan_init() {
|
|
AsanActivate();
|
|
AsanInitInternal();
|
|
}
|
|
|
|
void __asan_version_mismatch_check() {
|
|
// Do nothing.
|
|
}
|