forked from OSchip/llvm-project
508 lines
18 KiB
C++
508 lines
18 KiB
C++
//===-- asan_rtl.cc -------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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_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 "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 "lsan/lsan_common.h"
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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 (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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UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg);
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}
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}
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if (common_flags()->coverage)
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__sanitizer_cov_dump();
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if (flags()->abort_on_error)
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Abort();
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internal__exit(flags()->exitcode);
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}
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static void AsanCheckFailed(const char *file, int line, const char *cond,
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u64 v1, u64 v2) {
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Report("AddressSanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n", file,
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line, cond, (uptr)v1, (uptr)v2);
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// FIXME: check for infinite recursion without a thread-local counter here.
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PRINT_CURRENT_STACK_CHECK();
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Die();
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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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// ---------------------- mmap -------------------- {{{1
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// Reserve memory range [beg, end].
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static void ReserveShadowMemoryRange(uptr beg, uptr end) {
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CHECK_EQ((beg % GetPageSizeCached()), 0);
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CHECK_EQ(((end + 1) % GetPageSizeCached()), 0);
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uptr size = end - beg + 1;
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DecreaseTotalMmap(size); // Don't count the shadow against mmap_limit_mb.
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void *res = MmapFixedNoReserve(beg, size);
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if (res != (void*)beg) {
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Report("ReserveShadowMemoryRange failed while trying to map 0x%zx bytes. "
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"Perhaps you're using ulimit -v\n", size);
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Abort();
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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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void __asan_report_ ## type ## size(uptr addr) { \
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GET_CALLER_PC_BP_SP; \
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__asan_report_error(pc, bp, sp, addr, is_write, size); \
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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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void __asan_report_ ## type ## _n(uptr addr, uptr size) { \
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GET_CALLER_PC_BP_SP; \
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__asan_report_error(pc, bp, sp, addr, is_write, size); \
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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(type, is_write, size) \
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extern "C" NOINLINE INTERFACE_ATTRIBUTE void __asan_##type##size(uptr addr); \
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void __asan_##type##size(uptr addr) { \
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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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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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__asan_report_error(pc, bp, sp, addr, is_write, size); \
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} \
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} \
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} \
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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 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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__asan_report_error(pc, bp, sp, addr, false, size);
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}
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}
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extern "C"
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NOINLINE INTERFACE_ATTRIBUTE 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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__asan_report_error(pc, bp, sp, addr, true, size);
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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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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_store1(0); break;
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case 7: __asan_report_store2(0); break;
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case 8: __asan_report_store4(0); break;
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case 9: __asan_report_store8(0); break;
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case 10: __asan_report_store16(0); break;
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case 12: __asan_register_globals(0, 0); break;
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case 13: __asan_unregister_globals(0, 0); break;
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case 14: __asan_set_death_callback(0); break;
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case 15: __asan_set_error_report_callback(0); break;
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case 16: __asan_handle_no_return(); break;
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case 17: __asan_address_is_poisoned(0); break;
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case 25: __asan_poison_memory_region(0, 0); break;
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case 26: __asan_unpoison_memory_region(0, 0); break;
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case 27: __asan_set_error_exit_code(0); break;
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case 30: __asan_before_dynamic_init(0); break;
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case 31: __asan_after_dynamic_init(); break;
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case 32: __asan_poison_stack_memory(0, 0); break;
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case 33: __asan_unpoison_stack_memory(0, 0); break;
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case 34: __asan_region_is_poisoned(0, 0); break;
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case 35: __asan_describe_address(0); break;
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}
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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 = GetMaxVirtualAddress();
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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 |= SHADOW_GRANULARITY * GetPageSizeCached() - 1;
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#endif // !ASAN_FIXED_MAPPING
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CHECK_EQ((kHighMemBeg % GetPageSizeCached()), 0);
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}
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static void ProtectGap(uptr a, uptr size) {
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CHECK_EQ(a, (uptr)Mprotect(a, size));
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}
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static void PrintAddressSpaceLayout() {
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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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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 %p %p",
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(void*)MEM_TO_SHADOW(kLowShadowBeg),
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(void*)MEM_TO_SHADOW(kLowShadowEnd),
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(void*)MEM_TO_SHADOW(kHighShadowBeg),
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(void*)MEM_TO_SHADOW(kHighShadowEnd));
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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=%zuM\n", (uptr)flags()->quarantine_size >> 20);
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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: %zx\n", (uptr)SHADOW_SCALE);
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Printf("SHADOW_GRANULARITY: %zx\n", (uptr)SHADOW_GRANULARITY);
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Printf("SHADOW_OFFSET: %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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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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// 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(flags());
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SetCanPoisonMemory(flags()->poison_heap);
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SetMallocContextSize(common_flags()->malloc_context_size);
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InitializeHighMemEnd();
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// Make sure we are not statically linked.
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AsanDoesNotSupportStaticLinkage();
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// Install tool-specific callbacks in sanitizer_common.
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SetDieCallback(AsanDie);
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SetCheckFailedCallback(AsanCheckFailed);
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SetPrintfAndReportCallback(AppendToErrorMessageBuffer);
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__sanitizer_set_report_path(common_flags()->log_path);
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// Enable UAR detection, if required.
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__asan_option_detect_stack_use_after_return =
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flags()->detect_stack_use_after_return;
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// Re-exec ourselves if we need to set additional env or command line args.
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MaybeReexec();
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// Setup internal allocator callback.
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SetLowLevelAllocateCallback(OnLowLevelAllocate);
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InitializeAsanInterceptors();
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// Enable system log ("adb logcat") on Android.
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// Doing this before interceptors are initialized crashes in:
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// AsanInitInternal -> android_log_write -> __interceptor_strcmp
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AndroidLogInit();
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ReplaceSystemMalloc();
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uptr shadow_start = kLowShadowBeg;
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if (kLowShadowBeg)
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shadow_start -= GetMmapGranularity();
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bool full_shadow_is_available =
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MemoryRangeIsAvailable(shadow_start, kHighShadowEnd);
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#if SANITIZER_LINUX && defined(__x86_64__) && defined(_LP64) && \
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!ASAN_FIXED_MAPPING
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if (!full_shadow_is_available) {
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kMidMemBeg = kLowMemEnd < 0x3000000000ULL ? 0x3000000000ULL : 0;
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kMidMemEnd = kLowMemEnd < 0x3000000000ULL ? 0x4fffffffffULL : 0;
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}
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#endif
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if (common_flags()->verbosity)
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PrintAddressSpaceLayout();
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DisableCoreDumperIfNecessary();
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if (full_shadow_is_available) {
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// mmap the low shadow plus at least one page at the left.
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if (kLowShadowBeg)
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ReserveShadowMemoryRange(shadow_start, kLowShadowEnd);
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// mmap the high shadow.
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ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd);
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// protect the gap.
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ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
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CHECK_EQ(kShadowGapEnd, kHighShadowBeg - 1);
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} else if (kMidMemBeg &&
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MemoryRangeIsAvailable(shadow_start, kMidMemBeg - 1) &&
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MemoryRangeIsAvailable(kMidMemEnd + 1, kHighShadowEnd)) {
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CHECK(kLowShadowBeg != kLowShadowEnd);
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// mmap the low shadow plus at least one page at the left.
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ReserveShadowMemoryRange(shadow_start, kLowShadowEnd);
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// mmap the mid shadow.
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ReserveShadowMemoryRange(kMidShadowBeg, kMidShadowEnd);
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// mmap the high shadow.
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ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd);
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// protect the gaps.
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ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
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ProtectGap(kShadowGap2Beg, kShadowGap2End - kShadowGap2Beg + 1);
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ProtectGap(kShadowGap3Beg, kShadowGap3End - kShadowGap3Beg + 1);
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} else {
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Report("Shadow memory range interleaves with an existing memory mapping. "
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"ASan cannot proceed correctly. ABORTING.\n");
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DumpProcessMap();
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Die();
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}
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AsanTSDInit(PlatformTSDDtor);
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InstallDeadlySignalHandlers(AsanOnSIGSEGV);
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InitializeAllocator(common_flags()->allocator_may_return_null,
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flags()->quarantine_size);
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MaybeStartBackgroudThread();
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// On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
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// should be set to 1 prior to initializing the threads.
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asan_inited = 1;
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asan_init_is_running = false;
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if (flags()->atexit)
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Atexit(asan_atexit);
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if (common_flags()->coverage) {
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__sanitizer_cov_init();
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Atexit(__sanitizer_cov_dump);
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}
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// interceptors
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InitTlsSize();
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// Create main thread.
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AsanThread *main_thread = AsanThread::Create(
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/* start_routine */ nullptr, /* arg */ nullptr, /* parent_tid */ 0,
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/* stack */ nullptr, /* detached */ true);
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CHECK_EQ(0, main_thread->tid());
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SetCurrentThread(main_thread);
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main_thread->ThreadStart(internal_getpid(),
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/* signal_thread_is_registered */ nullptr);
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force_interface_symbols(); // no-op.
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SanitizerInitializeUnwinder();
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#if CAN_SANITIZE_LEAKS
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__lsan::InitCommonLsan(false);
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if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) {
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Atexit(__lsan::DoLeakCheck);
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}
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#endif // CAN_SANITIZE_LEAKS
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InitializeSuppressions();
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VReport(1, "AddressSanitizer Init done\n");
|
|
}
|
|
|
|
// 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 initializer from .preinit_array haven't run).
|
|
|
|
class AsanInitializer {
|
|
public: // NOLINT
|
|
AsanInitializer() {
|
|
AsanCheckIncompatibleRT();
|
|
AsanCheckDynamicRTPrereqs();
|
|
AsanInitFromRtl();
|
|
}
|
|
};
|
|
|
|
static AsanInitializer asan_initializer;
|
|
#endif // ASAN_DYNAMIC
|
|
|
|
} // namespace __asan
|
|
|
|
// ---------------------- Interface ---------------- {{{1
|
|
using namespace __asan; // NOLINT
|
|
|
|
int NOINLINE __asan_set_error_exit_code(int exit_code) {
|
|
int old = flags()->exitcode;
|
|
flags()->exitcode = exit_code;
|
|
return old;
|
|
}
|
|
|
|
void NOINLINE __asan_handle_no_return() {
|
|
int local_stack;
|
|
AsanThread *curr_thread = GetCurrentThread();
|
|
CHECK(curr_thread);
|
|
uptr PageSize = GetPageSizeCached();
|
|
uptr top = curr_thread->stack_top();
|
|
uptr bottom = ((uptr)&local_stack - PageSize) & ~(PageSize-1);
|
|
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 top: %p; bottom %p; size: %p (%zd)\n"
|
|
"False positive error reports may follow\n"
|
|
"For details see "
|
|
"http://code.google.com/p/address-sanitizer/issues/detail?id=189\n",
|
|
top, bottom, top - bottom, top - bottom);
|
|
return;
|
|
}
|
|
PoisonShadow(bottom, top - bottom, 0);
|
|
if (curr_thread->has_fake_stack())
|
|
curr_thread->fake_stack()->HandleNoReturn();
|
|
}
|
|
|
|
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() {
|
|
AsanCheckIncompatibleRT();
|
|
AsanActivate();
|
|
AsanInitInternal();
|
|
}
|