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/*
* Copyright 2020 The Android Open Source Project
*
* 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.
*/
// Authors: corbin.souffrant@leviathansecurity.com
// brian.balling@leviathansecurity.com
#include <fuzzer/FuzzedDataProvider.h>
#include <helpers.h>
#include <pdx/client_channel.h>
#include <pdx/service.h>
#include <pdx/service_dispatcher.h>
#include <stddef.h>
#include <stdint.h>
#include <sys/eventfd.h>
#include <thread>
using namespace android::pdx;
// Dispatch fuzzer entry point. This fuzzer creates a ServiceDispatcher
// and creates an endpoint that returns fuzzed messages that are passed
// to the ReceiveAndDispatch and DispatchLoop functions.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
eventfd_t wakeup_val = 1;
FuzzedDataProvider fdp = FuzzedDataProvider(data, size);
// Endpoint is only used to be immediately wrapped as a unique_ptr,
// so it is ok to be using a raw ptr and new here without freeing.
FuzzEndpoint* endpoint = new FuzzEndpoint(&fdp);
std::unique_ptr<ServiceDispatcher> dispatcher = ServiceDispatcher::Create();
std::shared_ptr<Channel> channel(nullptr);
std::shared_ptr<Client> client(nullptr);
std::shared_ptr<Service> service(
new Service("FuzzService", std::unique_ptr<Endpoint>(endpoint)));
service->SetChannel(0, std::shared_ptr<Channel>(channel));
dispatcher->AddService(service);
// Dispatcher blocks, so needs to run in its own thread.
std::thread run_dispatcher([&]() {
uint8_t opt = 0;
// Right now the only operations block, so the while loop is pointless
// but leaving it in, just in case that ever changes.
while (fdp.remaining_bytes() > sizeof(MessageInfo)) {
opt = fdp.ConsumeIntegral<uint8_t>() % dispatcher_operations.size();
dispatcher_operations[opt](dispatcher, &fdp);
}
});
// Continuously wake up the epoll so the dispatcher can run.
while (fdp.remaining_bytes() > sizeof(MessageInfo)) {
eventfd_write(endpoint->epoll_fd(), wakeup_val);
}
// Cleanup the dispatcher and thread.
dispatcher->SetCanceled(true);
if (run_dispatcher.joinable())
run_dispatcher.join();
dispatcher->RemoveService(service);
return 0;
}
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