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108 lines
3.4 KiB
C++
108 lines
3.4 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/debug/asan_invalid_access.h"
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#include <stddef.h>
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#include <memory>
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#include "base/debug/alias.h"
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#include "base/logging.h"
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#include "build/build_config.h"
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#if defined(OS_WIN)
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#include <windows.h>
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#endif
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namespace base {
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namespace debug {
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namespace {
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#if defined(SYZYASAN) && defined(COMPILER_MSVC)
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// Disable warning C4530: "C++ exception handler used, but unwind semantics are
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// not enabled". We don't want to change the compilation flags just for this
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// test, and no exception should be triggered here, so this warning has no value
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// here.
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#pragma warning(push)
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#pragma warning(disable: 4530)
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// Corrupt a memory block and make sure that the corruption gets detected either
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// when we free it or when another crash happens (if |induce_crash| is set to
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// true).
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NOINLINE void CorruptMemoryBlock(bool induce_crash) {
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// NOTE(sebmarchand): We intentionally corrupt a memory block here in order to
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// trigger an Address Sanitizer (ASAN) error report.
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static const int kArraySize = 5;
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int* array = new int[kArraySize];
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// Encapsulate the invalid memory access into a try-catch statement to prevent
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// this function from being instrumented. This way the underflow won't be
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// detected but the corruption will (as the allocator will still be hooked).
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try {
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// Declares the dummy value as volatile to make sure it doesn't get
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// optimized away.
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int volatile dummy = array[-1]--;
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base::debug::Alias(const_cast<int*>(&dummy));
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} catch (...) {
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}
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if (induce_crash)
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CHECK(false);
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delete[] array;
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}
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#pragma warning(pop)
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#endif // SYZYASAN && COMPILER_MSVC
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} // namespace
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#if defined(ADDRESS_SANITIZER) || defined(SYZYASAN)
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// NOTE(sebmarchand): We intentionally perform some invalid heap access here in
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// order to trigger an AddressSanitizer (ASan) error report.
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static const size_t kArraySize = 5;
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void AsanHeapOverflow() {
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// Declares the array as volatile to make sure it doesn't get optimized away.
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std::unique_ptr<volatile int[]> array(
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const_cast<volatile int*>(new int[kArraySize]));
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int dummy = array[kArraySize];
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base::debug::Alias(&dummy);
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}
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void AsanHeapUnderflow() {
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// Declares the array as volatile to make sure it doesn't get optimized away.
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std::unique_ptr<volatile int[]> array(
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const_cast<volatile int*>(new int[kArraySize]));
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// We need to store the underflow address in a temporary variable as trying to
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// access array[-1] will trigger a warning C4245: "conversion from 'int' to
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// 'size_t', signed/unsigned mismatch".
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volatile int* underflow_address = &array[0] - 1;
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int dummy = *underflow_address;
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base::debug::Alias(&dummy);
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}
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void AsanHeapUseAfterFree() {
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// Declares the array as volatile to make sure it doesn't get optimized away.
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std::unique_ptr<volatile int[]> array(
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const_cast<volatile int*>(new int[kArraySize]));
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volatile int* dangling = array.get();
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array.reset();
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int dummy = dangling[kArraySize / 2];
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base::debug::Alias(&dummy);
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}
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#endif // ADDRESS_SANITIZER || SYZYASAN
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#if defined(SYZYASAN) && defined(COMPILER_MSVC)
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void AsanCorruptHeapBlock() {
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CorruptMemoryBlock(false);
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}
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void AsanCorruptHeap() {
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CorruptMemoryBlock(true);
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}
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#endif // SYZYASAN && COMPILER_MSVC
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} // namespace debug
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} // namespace base
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