60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
// Copyright 2018 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 <stdint.h>
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#include <stdlib.h>
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#include <iostream>
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#include <vector>
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#include "base/environment.h"
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#include "base/logging.h"
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#include "components/zucchini/buffer_view.h"
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#include "components/zucchini/fuzzers/file_pair.pb.h"
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#include "components/zucchini/patch_reader.h"
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#include "components/zucchini/zucchini.h"
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#include "testing/libfuzzer/proto/lpm_interface.h"
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struct Environment {
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Environment() {
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logging::SetMinLogLevel(logging::LOG_FATAL); // Disable console spamming.
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}
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};
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Environment* env = new Environment();
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DEFINE_BINARY_PROTO_FUZZER(const zucchini::fuzzers::FilePair& file_pair) {
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// Dump code for debugging.
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if (base::Environment::Create()->HasVar("LPM_DUMP_NATIVE_INPUT")) {
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std::cout << "Old File: " << file_pair.old_file() << std::endl
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<< "Patch File: " << file_pair.new_or_patch_file() << std::endl;
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}
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// Prepare data.
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zucchini::ConstBufferView old_image(
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reinterpret_cast<const uint8_t*>(file_pair.old_file().data()),
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file_pair.old_file().size());
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zucchini::ConstBufferView patch_file(
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reinterpret_cast<const uint8_t*>(file_pair.new_or_patch_file().data()),
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file_pair.new_or_patch_file().size());
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// Generate a patch reader.
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auto patch_reader = zucchini::EnsemblePatchReader::Create(patch_file);
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// Abort if the patch can't be read.
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if (!patch_reader.has_value())
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return;
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// Create the underlying new file.
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size_t new_size = patch_reader->header().new_size;
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// Reject unreasonably large "new" files that fuzzed patch may specify.
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if (new_size > 64 * 1024)
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return;
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std::vector<uint8_t> new_data(new_size);
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zucchini::MutableBufferView new_image(new_data.data(), new_size);
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// Fuzz target.
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zucchini::ApplyBuffer(old_image, *patch_reader, new_image);
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// No need to check whether output exist, or if so, whether it's valid.
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}
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