| // 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. |
| } |