8726d3a448
Rather than use a std::vector for backing memory, allocate the memory using a new with nothrow, and in MemoryBuffer use realloc. Since the size field is coming from the elf, it could be corrupted or intentionally crafted to cause problems. In addition, add some other protections to make sure that overflows don't occur. Bug: 146215949 Test: Ran unit tests with jemalloc and scudo to verify that they Test: both behave the same way. Change-Id: If14243ce382ba5403a6bacd0ec673452c6b7c3be
57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _LIBUNWINDSTACK_MEMORY_BUFFER_H
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#define _LIBUNWINDSTACK_MEMORY_BUFFER_H
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#include <stdint.h>
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#include <string>
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#include <vector>
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#include <unwindstack/Memory.h>
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namespace unwindstack {
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class MemoryBuffer : public Memory {
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public:
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MemoryBuffer() = default;
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virtual ~MemoryBuffer() { free(raw_); }
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size_t Read(uint64_t addr, void* dst, size_t size) override;
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uint8_t* GetPtr(size_t offset);
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bool Resize(size_t size) {
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raw_ = reinterpret_cast<uint8_t*>(realloc(raw_, size));
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if (raw_ == nullptr) {
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size_ = 0;
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return false;
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}
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size_ = size;
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return true;
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}
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uint64_t Size() { return size_; }
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private:
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uint8_t* raw_ = nullptr;
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size_t size_ = 0;
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};
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} // namespace unwindstack
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#endif // _LIBUNWINDSTACK_MEMORY_BUFFER_H
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