77 lines
2.9 KiB
C++
77 lines
2.9 KiB
C++
/**
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* Copyright (C) 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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#include <binder/IMemory.h>
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#include <binder/MemoryDealer.h>
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#include <private/android_filesystem_config.h>
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#include "MediaLogService.h"
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#include "fuzzer/FuzzedDataProvider.h"
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constexpr const char* kWriterNames[2] = {"FastMixer", "FastCapture"};
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constexpr size_t kMinSize = 0x100;
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constexpr size_t kMaxSize = 0x10000;
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constexpr size_t kLogMemorySize = 400 * 1024;
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constexpr size_t kMaxNumLines = USHRT_MAX;
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using namespace android;
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class MediaLogFuzzer {
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public:
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void init();
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void process(const uint8_t* data, size_t size);
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private:
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sp<MemoryDealer> mMemoryDealer = nullptr;
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sp<MediaLogService> mService = nullptr;
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};
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void MediaLogFuzzer::init() {
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setuid(AID_MEDIA);
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mService = new MediaLogService();
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mMemoryDealer = new MemoryDealer(kLogMemorySize, "MediaLogFuzzer", MemoryHeapBase::READ_ONLY);
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}
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void MediaLogFuzzer::process(const uint8_t* data, size_t size) {
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FuzzedDataProvider fuzzedDataProvider(data, size);
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size_t writerNameIdx =
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fuzzedDataProvider.ConsumeIntegralInRange<size_t>(0, std::size(kWriterNames) - 1);
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bool shouldDumpBeforeUnregister = fuzzedDataProvider.ConsumeBool();
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size_t logSize = fuzzedDataProvider.ConsumeIntegralInRange<size_t>(kMinSize, kMaxSize);
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sp<IMemory> logBuffer = mMemoryDealer->allocate(NBLog::Timeline::sharedSize(logSize));
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Vector<String16> args;
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size_t numberOfLines = fuzzedDataProvider.ConsumeIntegralInRange<size_t>(0, kMaxNumLines);
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for (size_t lineIdx = 0; lineIdx < numberOfLines; ++lineIdx) {
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args.add(static_cast<String16>(fuzzedDataProvider.ConsumeRandomLengthString().c_str()));
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}
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const char* fileName = "logDumpFile";
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int fd = memfd_create(fileName, MFD_ALLOW_SEALING);
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fuzzedDataProvider.ConsumeData(logBuffer->unsecurePointer(), logBuffer->size());
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mService->registerWriter(logBuffer, logSize, kWriterNames[writerNameIdx]);
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if (shouldDumpBeforeUnregister) {
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mService->dump(fd, args);
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mService->unregisterWriter(logBuffer);
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} else {
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mService->unregisterWriter(logBuffer);
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mService->dump(fd, args);
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}
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}
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
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MediaLogFuzzer mediaLogFuzzer = MediaLogFuzzer();
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mediaLogFuzzer.init();
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mediaLogFuzzer.process(data, size);
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return 0;
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}
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