7168f2726e
This adds fuzzers for: - CallStack - Looper - LruCache - Printer - ProcessCallStack - PropertyMap - RWLock - RefBase - StopWatch. Test: Ran each fuzzer for 10 minutes. Rough coverage est. (likely far below actual value): 10.97% Signed-off-by: Dylan Katz <dylan.katz@leviathansecurity.com> Change-Id: I2f9f35c18b13338c282fb7f9c3ea4099ecb2c56f
103 lines
4 KiB
C++
Executable file
103 lines
4 KiB
C++
Executable file
/*
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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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#include <atomic>
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#include <thread>
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#include "fuzzer/FuzzedDataProvider.h"
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#include "utils/RefBase.h"
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#include "utils/StrongPointer.h"
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using android::RefBase;
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using android::sp;
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using android::wp;
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static constexpr int REFBASE_INITIAL_STRONG_VALUE = (1 << 28);
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static constexpr int REFBASE_MAX_COUNT = 0xfffff;
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static constexpr int MAX_OPERATIONS = 100;
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static constexpr int MAX_THREADS = 10;
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bool canDecrementStrong(RefBase* ref) {
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// There's an assert around decrementing the strong count too much that causes an artificial
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// crash This is just running BAD_STRONG from RefBase
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const int32_t count = ref->getStrongCount() - 1;
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return !(count == 0 || ((count) & (~(REFBASE_MAX_COUNT | REFBASE_INITIAL_STRONG_VALUE))) != 0);
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}
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bool canDecrementWeak(RefBase* ref) {
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const int32_t count = ref->getWeakRefs()->getWeakCount() - 1;
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return !((count) == 0 || ((count) & (~REFBASE_MAX_COUNT)) != 0);
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}
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struct RefBaseSubclass : public RefBase {
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RefBaseSubclass() {}
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virtual ~RefBaseSubclass() {}
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};
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std::vector<std::function<void(RefBaseSubclass*)>> operations = {
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[](RefBaseSubclass* ref) -> void { ref->getStrongCount(); },
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[](RefBaseSubclass* ref) -> void { ref->printRefs(); },
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[](RefBaseSubclass* ref) -> void { ref->getWeakRefs()->printRefs(); },
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[](RefBaseSubclass* ref) -> void { ref->getWeakRefs()->getWeakCount(); },
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[](RefBaseSubclass* ref) -> void { ref->getWeakRefs()->refBase(); },
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[](RefBaseSubclass* ref) -> void { ref->incStrong(nullptr); },
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[](RefBaseSubclass* ref) -> void {
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if (canDecrementStrong(ref)) {
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ref->decStrong(nullptr);
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}
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},
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[](RefBaseSubclass* ref) -> void { ref->forceIncStrong(nullptr); },
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[](RefBaseSubclass* ref) -> void { ref->createWeak(nullptr); },
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[](RefBaseSubclass* ref) -> void { ref->getWeakRefs()->attemptIncStrong(nullptr); },
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[](RefBaseSubclass* ref) -> void { ref->getWeakRefs()->attemptIncWeak(nullptr); },
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[](RefBaseSubclass* ref) -> void {
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if (canDecrementWeak(ref)) {
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ref->getWeakRefs()->decWeak(nullptr);
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}
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},
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[](RefBaseSubclass* ref) -> void { ref->getWeakRefs()->incWeak(nullptr); },
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[](RefBaseSubclass* ref) -> void { ref->getWeakRefs()->printRefs(); },
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};
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void loop(RefBaseSubclass* loopRef, const std::vector<uint8_t>& fuzzOps) {
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for (auto op : fuzzOps) {
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operations[op % operations.size()](loopRef);
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}
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}
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void spawnThreads(FuzzedDataProvider* dataProvider) {
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std::vector<std::thread> threads = std::vector<std::thread>();
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// Get the number of threads to generate
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uint8_t count = dataProvider->ConsumeIntegralInRange<uint8_t>(1, MAX_THREADS);
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// Generate threads
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for (uint8_t i = 0; i < count; i++) {
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RefBaseSubclass* threadRef = new RefBaseSubclass();
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uint8_t opCount = dataProvider->ConsumeIntegralInRange<uint8_t>(1, MAX_OPERATIONS);
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std::vector<uint8_t> threadOperations = dataProvider->ConsumeBytes<uint8_t>(opCount);
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std::thread tmp = std::thread(loop, threadRef, threadOperations);
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threads.push_back(move(tmp));
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}
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for (auto& th : threads) {
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th.join();
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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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FuzzedDataProvider dataProvider(data, size);
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spawnThreads(&dataProvider);
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return 0;
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}
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