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