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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <stddef.h>
#include <stdint.h>
#include <log/log.h>
#include <unwindstack/Memory.h>
#include "gwp_asan/common.h"
#include "types.h"
#include "utility.h"
class Cause;
class Tombstone;
class GwpAsanCrashData {
public:
GwpAsanCrashData() = delete;
~GwpAsanCrashData() = default;
// Construct the crash data object. Takes a handle to the object that can
// supply the memory of the dead process, and pointers to the GWP-ASan state
// and metadata regions within that process. Also takes the thread information
// of the crashed process. If the process didn't crash via SEGV, GWP-ASan may
// still be responsible, as it terminates when it detects an internal error
// (double free, invalid free). In these cases, we will retrieve the fault
// address from the GWP-ASan allocator's state.
GwpAsanCrashData(unwindstack::Memory* process_memory, const ProcessInfo& process_info,
const ThreadInfo& thread_info);
// Is GWP-ASan responsible for this crash.
bool CrashIsMine() const;
// Returns the fault address. The fault address may be the same as provided
// during construction, or it may have been retrieved from GWP-ASan's internal
// allocator crash state.
uintptr_t GetFaultAddress() const;
void AddCauseProtos(Tombstone* tombstone, unwindstack::Unwinder* unwinder) const;
protected:
// Is GWP-ASan responsible for this crash.
bool is_gwp_asan_responsible_ = false;
// Thread ID of the crash.
size_t thread_id_;
// The type of error that GWP-ASan caused (and the stringified version),
// Undefined if GWP-ASan isn't responsible for the crash.
gwp_asan::Error error_;
const char* error_string_;
// Pointer to the crash address. Holds the internal crash address if it
// exists, otherwise the address provided at construction.
uintptr_t crash_address_ = 0u;
// Pointer to the metadata for the responsible allocation, nullptr if it
// doesn't exist.
const gwp_asan::AllocationMetadata* responsible_allocation_ = nullptr;
// Internal state.
gwp_asan::AllocatorState state_;
std::unique_ptr<const gwp_asan::AllocationMetadata> metadata_;
};
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