75 lines
2.7 KiB
C++
75 lines
2.7 KiB
C++
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/*
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* Copyright 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Authors: corbin.souffrant@leviathansecurity.com
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// brian.balling@leviathansecurity.com
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#include <fuzzer/FuzzedDataProvider.h>
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#include <helpers.h>
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#include <pdx/client_channel.h>
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#include <pdx/service.h>
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#include <pdx/service_dispatcher.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <sys/eventfd.h>
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#include <thread>
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using namespace android::pdx;
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// Dispatch fuzzer entry point. This fuzzer creates a ServiceDispatcher
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// and creates an endpoint that returns fuzzed messages that are passed
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// to the ReceiveAndDispatch and DispatchLoop functions.
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
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eventfd_t wakeup_val = 1;
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FuzzedDataProvider fdp = FuzzedDataProvider(data, size);
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// Endpoint is only used to be immediately wrapped as a unique_ptr,
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// so it is ok to be using a raw ptr and new here without freeing.
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FuzzEndpoint* endpoint = new FuzzEndpoint(&fdp);
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std::unique_ptr<ServiceDispatcher> dispatcher = ServiceDispatcher::Create();
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std::shared_ptr<Channel> channel(nullptr);
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std::shared_ptr<Client> client(nullptr);
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std::shared_ptr<Service> service(
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new Service("FuzzService", std::unique_ptr<Endpoint>(endpoint)));
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service->SetChannel(0, std::shared_ptr<Channel>(channel));
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dispatcher->AddService(service);
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// Dispatcher blocks, so needs to run in its own thread.
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std::thread run_dispatcher([&]() {
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uint8_t opt = 0;
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// Right now the only operations block, so the while loop is pointless
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// but leaving it in, just in case that ever changes.
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while (fdp.remaining_bytes() > sizeof(MessageInfo)) {
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opt = fdp.ConsumeIntegral<uint8_t>() % dispatcher_operations.size();
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dispatcher_operations[opt](dispatcher, &fdp);
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}
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});
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// Continuously wake up the epoll so the dispatcher can run.
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while (fdp.remaining_bytes() > sizeof(MessageInfo)) {
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eventfd_write(endpoint->epoll_fd(), wakeup_val);
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}
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// Cleanup the dispatcher and thread.
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dispatcher->SetCanceled(true);
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if (run_dispatcher.joinable())
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run_dispatcher.join();
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dispatcher->RemoveService(service);
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return 0;
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}
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