/*
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* Copyright (C) 2015 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stdint.h>
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#include <string.h>
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#include <vector>
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#include "Config.h"
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#include "DebugData.h"
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#include "GuardData.h"
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#include "backtrace.h"
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#include "debug_disable.h"
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#include "debug_log.h"
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#include "malloc_debug.h"
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GuardData::GuardData(DebugData* debug_data, int init_value, size_t num_bytes)
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: OptionData(debug_data) {
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// Create a buffer for fast comparisons of the front guard.
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cmp_mem_.resize(num_bytes);
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memset(cmp_mem_.data(), init_value, cmp_mem_.size());
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}
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void GuardData::LogFailure(const Header* header, const void* pointer, const void* data) {
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error_log(LOG_DIVIDER);
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error_log("+++ ALLOCATION %p SIZE %zu HAS A CORRUPTED %s GUARD", pointer, header->size,
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GetTypeName());
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// Log all of the failing bytes.
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const uint8_t* expected = cmp_mem_.data();
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int pointer_idx = reinterpret_cast<uintptr_t>(data) - reinterpret_cast<uintptr_t>(pointer);
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const uint8_t* real = reinterpret_cast<const uint8_t*>(data);
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for (size_t i = 0; i < cmp_mem_.size(); i++, pointer_idx++) {
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if (real[i] != expected[i]) {
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error_log(" allocation[%d] = 0x%02x (expected 0x%02x)", pointer_idx, real[i], expected[i]);
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}
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}
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error_log("Backtrace at time of failure:");
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BacktraceAndLog();
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error_log(LOG_DIVIDER);
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if (g_debug->config().options() & ABORT_ON_ERROR) {
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abort();
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}
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}
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FrontGuardData::FrontGuardData(DebugData* debug_data, const Config& config, size_t* offset)
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: GuardData(debug_data, config.front_guard_value(), config.front_guard_bytes()) {
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// Create a buffer for fast comparisons of the front guard.
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cmp_mem_.resize(config.front_guard_bytes());
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memset(cmp_mem_.data(), config.front_guard_value(), cmp_mem_.size());
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// Assumes that front_bytes is a multiple of MINIMUM_ALIGNMENT_BYTES.
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offset_ = *offset;
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*offset += config.front_guard_bytes();
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}
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bool FrontGuardData::Valid(const Header* header) {
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return GuardData::Valid(debug_->GetFrontGuard(header));
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}
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void FrontGuardData::LogFailure(const Header* header) {
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GuardData::LogFailure(header, debug_->GetPointer(header), debug_->GetFrontGuard(header));
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}
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RearGuardData::RearGuardData(DebugData* debug_data, const Config& config)
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: GuardData(debug_data, config.rear_guard_value(), config.rear_guard_bytes()) {}
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bool RearGuardData::Valid(const Header* header) {
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return GuardData::Valid(debug_->GetRearGuard(header));
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}
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void RearGuardData::LogFailure(const Header* header) {
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GuardData::LogFailure(header, debug_->GetPointer(header), debug_->GetRearGuard(header));
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}
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