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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.
#ifndef SRC_LIBFUZZER_LIBFUZZER_MACRO_H_
#define SRC_LIBFUZZER_LIBFUZZER_MACRO_H_
#include <stddef.h>
#include <cstdint>
#include <functional>
#include <type_traits>
#include "port/protobuf.h"
// Defines custom mutator, crossover and test functions using default
// serialization format. Default is text.
#define DEFINE_PROTO_FUZZER(arg) DEFINE_TEXT_PROTO_FUZZER(arg)
// Defines custom mutator, crossover and test functions using text
// serialization. This format is more convenient to read.
#define DEFINE_TEXT_PROTO_FUZZER(arg) DEFINE_PROTO_FUZZER_IMPL(false, arg)
// Defines custom mutator, crossover and test functions using binary
// serialization. This makes mutations faster. However often test function is
// significantly slower than mutator, so fuzzing rate may stay unchanged.
#define DEFINE_BINARY_PROTO_FUZZER(arg) DEFINE_PROTO_FUZZER_IMPL(true, arg)
// Registers the callback as a potential mutation performed on the parent
// message of a field. This must be called inside an initialization code block.
// libFuzzer suggests putting one-time-initialization in a function used to
// initialize a static variable inside the fuzzer target. For example:
//
// static bool Modify(
// SomeMessage* message /* Fix or additionally modify the message */,
// unsigned int seed /* If random generator is needed use this seed */) {
// ...
// }
//
// DEFINE_PROTO_FUZZER(const SomeMessage& msg) {
// static PostProcessorRegistration reg(&Modify);
// }
// Implementation of macros above.
#define DEFINE_CUSTOM_PROTO_MUTATOR_IMPL(use_binary, Proto) \
extern "C" size_t LLVMFuzzerCustomMutator( \
uint8_t* data, size_t size, size_t max_size, unsigned int seed) { \
using protobuf_mutator::libfuzzer::CustomProtoMutator; \
Proto input; \
return CustomProtoMutator(use_binary, data, size, max_size, seed, &input); \
}
#define DEFINE_CUSTOM_PROTO_CROSSOVER_IMPL(use_binary, Proto) \
extern "C" size_t LLVMFuzzerCustomCrossOver( \
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) { \
using protobuf_mutator::libfuzzer::CustomProtoCrossOver; \
Proto input1; \
Proto input2; \
return CustomProtoCrossOver(use_binary, data1, size1, data2, size2, out, \
max_out_size, seed, &input1, &input2); \
}
#define DEFINE_TEST_ONE_PROTO_INPUT_IMPL(use_binary, Proto) \
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) { \
using protobuf_mutator::libfuzzer::LoadProtoInput; \
Proto input; \
if (LoadProtoInput(use_binary, data, size, &input)) \
TestOneProtoInput(input); \
return 0; \
}
#define DEFINE_POST_PROCESS_PROTO_MUTATION_IMPL(Proto) \
using PostProcessorRegistration = \
protobuf_mutator::libfuzzer::PostProcessorRegistration<Proto>;
#define DEFINE_PROTO_FUZZER_IMPL(use_binary, arg) \
static void TestOneProtoInput(arg); \
using FuzzerProtoType = \
protobuf_mutator::libfuzzer::macro_internal::GetFirstParam< \
decltype(&TestOneProtoInput)>::type; \
DEFINE_CUSTOM_PROTO_MUTATOR_IMPL(use_binary, FuzzerProtoType) \
DEFINE_CUSTOM_PROTO_CROSSOVER_IMPL(use_binary, FuzzerProtoType) \
DEFINE_TEST_ONE_PROTO_INPUT_IMPL(use_binary, FuzzerProtoType) \
DEFINE_POST_PROCESS_PROTO_MUTATION_IMPL(FuzzerProtoType) \
static void TestOneProtoInput(arg)
namespace protobuf_mutator {
namespace libfuzzer {
size_t CustomProtoMutator(bool binary, uint8_t* data, size_t size,
size_t max_size, unsigned int seed,
protobuf::Message* 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);
bool LoadProtoInput(bool binary, const uint8_t* data, size_t size,
protobuf::Message* input);
void RegisterPostProcessor(
const protobuf::Descriptor* desc,
std::function<void(protobuf::Message* message, unsigned int seed)>
callback);
template <class Proto>
struct PostProcessorRegistration {
PostProcessorRegistration(
const std::function<void(Proto* message, unsigned int seed)>& callback) {
RegisterPostProcessor(
Proto::descriptor(),
[callback](protobuf::Message* message, unsigned int seed) {
callback(static_cast<Proto*>(message), seed);
});
}
};
namespace macro_internal {
template <typename T>
struct GetFirstParam;
template <class Arg>
struct GetFirstParam<void (*)(Arg)> {
using type = typename std::remove_const<
typename std::remove_reference<Arg>::type>::type;
};
} // namespace macro_internal
} // namespace libfuzzer
} // namespace protobuf_mutator
#endif // SRC_LIBFUZZER_LIBFUZZER_MACRO_H_
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