1 /*
2 * Copyright 2020 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 #include <chrono>
17 #include <thread>
18
19 #include "fuzzer/FuzzedDataProvider.h"
20 #include "mediautils/TimeCheck.h"
21
22 static constexpr int kMaxStringLen = 256;
23
24 // While it might be interesting to test long-running
25 // jobs, it seems unlikely it'd lead to the types of crashes
26 // we're looking for, and would mean a significant increase in fuzzer time.
27 // Therefore, we are setting a low cap.
28 static constexpr uint32_t kMaxTimeoutMs = 1000;
29 static constexpr uint32_t kMinTimeoutMs = 200;
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)30 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
31 FuzzedDataProvider data_provider(data, size);
32
33 // There's essentially 5 operations that we can access in this class
34 // 1. The time it takes to run this operation. As mentioned above,
35 // long-running tasks are not good for fuzzing, but there will be
36 // some change in the run time.
37 uint32_t timeoutMs =
38 data_provider.ConsumeIntegralInRange<uint32_t>(kMinTimeoutMs, kMaxTimeoutMs);
39 uint8_t pid_size = data_provider.ConsumeIntegral<uint8_t>();
40 std::vector<pid_t> pids(pid_size);
41 for (auto& pid : pids) {
42 pid = data_provider.ConsumeIntegral<pid_t>();
43 }
44
45 // 2. We also have setAudioHalPids, which is populated with the pids set
46 // above.
47 android::TimeCheck::setAudioHalPids(pids);
48 std::string name = data_provider.ConsumeRandomLengthString(kMaxStringLen);
49
50 // 3. The constructor, which is fuzzed here:
51 android::TimeCheck timeCheck(name.c_str(), timeoutMs);
52 // We will leave some buffer to avoid sleeping too long
53 uint8_t sleep_amount_ms = data_provider.ConsumeIntegralInRange<uint8_t>(0, timeoutMs / 2);
54
55 // We want to make sure we can cover the time out functionality.
56 if (sleep_amount_ms) {
57 auto ms = std::chrono::milliseconds(sleep_amount_ms);
58 std::this_thread::sleep_for(ms);
59 }
60
61 // 4. Finally, the destructor on timecheck. These seem to be the only factors
62 // in play.
63 return 0;
64 }
65