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// Copyright 2017 Google Inc. All rights reserved.
//
// 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.
#include "src/libfuzzer/libfuzzer_macro.h"
#include <algorithm>
#include <memory>
#include <vector>
#include "src/binary_format.h"
#include "src/libfuzzer/libfuzzer_mutator.h"
#include "src/text_format.h"
namespace protobuf_mutator {
namespace libfuzzer {
namespace {
class InputReader {
public:
InputReader(const uint8_t* data, size_t size) : data_(data), size_(size) {}
virtual ~InputReader() = default;
virtual bool Read(protobuf::Message* message) const = 0;
const uint8_t* data() const { return data_; }
size_t size() const { return size_; }
private:
const uint8_t* data_;
size_t size_;
};
class OutputWriter {
public:
OutputWriter(uint8_t* data, size_t size) : data_(data), size_(size) {}
virtual ~OutputWriter() = default;
virtual size_t Write(const protobuf::Message& message) = 0;
uint8_t* data() const { return data_; }
size_t size() const { return size_; }
private:
uint8_t* data_;
size_t size_;
};
class TextInputReader : public InputReader {
public:
using InputReader::InputReader;
bool Read(protobuf::Message* message) const override {
return ParseTextMessage(data(), size(), message);
}
};
class TextOutputWriter : public OutputWriter {
public:
using OutputWriter::OutputWriter;
size_t Write(const protobuf::Message& message) override {
return SaveMessageAsText(message, data(), size());
}
};
class BinaryInputReader : public InputReader {
public:
using InputReader::InputReader;
bool Read(protobuf::Message* message) const override {
return ParseBinaryMessage(data(), size(), message);
}
};
class BinaryOutputWriter : public OutputWriter {
public:
using OutputWriter::OutputWriter;
size_t Write(const protobuf::Message& message) override {
return SaveMessageAsBinary(message, data(), size());
}
};
class LastMutationCache {
public:
void Store(const uint8_t* data, size_t size, protobuf::Message* message) {
if (!message_) message_.reset(message->New());
message->GetReflection()->Swap(message, message_.get());
data_.assign(data, data + size);
}
bool LoadIfSame(const uint8_t* data, size_t size,
protobuf::Message* message) {
if (!message_ || size != data_.size() ||
!std::equal(data_.begin(), data_.end(), data))
return false;
message->GetReflection()->Swap(message, message_.get());
message_.reset();
return true;
}
private:
std::vector<uint8_t> data_;
std::unique_ptr<protobuf::Message> message_;
};
LastMutationCache* GetCache() {
static LastMutationCache cache;
return &cache;
}
Mutator* GetMutator() {
static Mutator mutator;
return &mutator;
}
size_t GetMaxSize(const InputReader& input, const OutputWriter& output,
const protobuf::Message& message) {
size_t max_size = message.ByteSizeLong() + output.size();
max_size -= std::min(max_size, input.size());
return max_size;
}
size_t MutateMessage(unsigned int seed, const InputReader& input,
OutputWriter* output, protobuf::Message* message) {
GetMutator()->Seed(seed);
input.Read(message);
size_t max_size = GetMaxSize(input, *output, *message);
GetMutator()->Mutate(message, max_size);
if (size_t new_size = output->Write(*message)) {
assert(new_size <= output->size());
GetCache()->Store(output->data(), new_size, message);
return new_size;
}
return 0;
}
size_t CrossOverMessages(unsigned int seed, const InputReader& input1,
const InputReader& input2, OutputWriter* output,
protobuf::Message* message1,
protobuf::Message* message2) {
GetMutator()->Seed(seed);
input1.Read(message1);
input2.Read(message2);
size_t max_size = GetMaxSize(input1, *output, *message1);
GetMutator()->CrossOver(*message2, message1, max_size);
if (size_t new_size = output->Write(*message1)) {
assert(new_size <= output->size());
GetCache()->Store(output->data(), new_size, message1);
return new_size;
}
return 0;
}
size_t MutateTextMessage(uint8_t* data, size_t size, size_t max_size,
unsigned int seed, protobuf::Message* message) {
TextInputReader input(data, size);
TextOutputWriter output(data, max_size);
return MutateMessage(seed, input, &output, message);
}
size_t CrossOverTextMessages(const uint8_t* data1, size_t size1,
const uint8_t* data2, size_t size2, uint8_t* out,
size_t max_out_size, unsigned int seed,
protobuf::Message* message1,
protobuf::Message* message2) {
TextInputReader input1(data1, size1);
TextInputReader input2(data2, size2);
TextOutputWriter output(out, max_out_size);
return CrossOverMessages(seed, input1, input2, &output, message1, message2);
}
size_t MutateBinaryMessage(uint8_t* data, size_t size, size_t max_size,
unsigned int seed, protobuf::Message* message) {
BinaryInputReader input(data, size);
BinaryOutputWriter output(data, max_size);
return MutateMessage(seed, input, &output, message);
}
size_t CrossOverBinaryMessages(const uint8_t* data1, size_t size1,
const uint8_t* data2, size_t size2, uint8_t* out,
size_t max_out_size, unsigned int seed,
protobuf::Message* message1,
protobuf::Message* message2) {
BinaryInputReader input1(data1, size1);
BinaryInputReader input2(data2, size2);
BinaryOutputWriter output(out, max_out_size);
return CrossOverMessages(seed, input1, input2, &output, message1, message2);
}
} // namespace
size_t CustomProtoMutator(bool binary, uint8_t* data, size_t size,
size_t max_size, unsigned int seed,
protobuf::Message* input) {
auto mutate = binary ? &MutateBinaryMessage : &MutateTextMessage;
return mutate(data, size, max_size, seed, input);
}
size_t CustomProtoCrossOver(bool binary, const uint8_t* data1, size_t size1,
const uint8_t* data2, size_t size2, uint8_t* out,
size_t max_out_size, unsigned int seed,
protobuf::Message* input1,
protobuf::Message* input2) {
auto cross = binary ? &CrossOverBinaryMessages : &CrossOverTextMessages;
return cross(data1, size1, data2, size2, out, max_out_size, seed, input1,
input2);
}
bool LoadProtoInput(bool binary, const uint8_t* data, size_t size,
protobuf::Message* input) {
if (GetCache()->LoadIfSame(data, size, input)) return true;
auto result = binary ? ParseBinaryMessage(data, size, input)
: ParseTextMessage(data, size, input);
if (!result) return false;
GetMutator()->Seed(size);
GetMutator()->Fix(input);
return true;
}
void RegisterPostProcessor(
const protobuf::Descriptor* desc,
std::function<void(protobuf::Message* message, unsigned int seed)>
callback) {
GetMutator()->RegisterPostProcessor(desc, callback);
}
} // namespace libfuzzer
} // namespace protobuf_mutator
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