1 /*
2 * Copyright (C) 2022 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
17 #include <fuzzer/FuzzedDataProvider.h>
18 #include <media/NdkMediaCrypto.h>
19 #include <functional>
20
21 #include <functional>
22
23 constexpr size_t kMaxString = 256;
24 constexpr size_t kMinBytes = 0;
25 constexpr size_t kMaxBytes = 1000;
26 constexpr size_t kMaxRuns = 100;
27
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)28 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
29 FuzzedDataProvider fdp(data, size);
30 AMediaUUID uuid = {};
31 size_t apiCount = 0;
32 int32_t maxLen = fdp.ConsumeIntegralInRange<size_t>(kMinBytes, (size_t)sizeof(AMediaUUID));
33 for (size_t idx = 0; idx < maxLen; ++idx) {
34 uuid[idx] = fdp.ConsumeIntegral<uint8_t>();
35 }
36 std::vector<uint8_t> initData =
37 fdp.ConsumeBytes<uint8_t>(fdp.ConsumeIntegralInRange<size_t>(kMinBytes, kMaxBytes));
38 AMediaCrypto* crypto = AMediaCrypto_new(uuid, initData.data(), initData.size());
39 /*
40 * The AMediaCrypto_isCryptoSchemeSupported API doesn't consume any input bytes,
41 * so when PickValueInArray() selects it repeatedly, only one byte is consumed by 'fdp'.
42 * As a result, on larger inputs, AMediaCrypto_isCryptoSchemeSupported can run a large
43 * number of times, potentially causing a timeout crash.
44 * Therefore, to prevent this issue, while loop is limited to kMaxRuns.
45 */
46 while (fdp.remaining_bytes() && ++apiCount <= kMaxRuns) {
47 auto invokeNdkCryptoFuzzer = fdp.PickValueInArray<const std::function<void()>>({
48 [&]() {
49 AMediaCrypto_requiresSecureDecoderComponent(
50 fdp.ConsumeRandomLengthString(kMaxString).c_str());
51 },
52 [&]() { AMediaCrypto_isCryptoSchemeSupported(uuid); },
53 });
54 invokeNdkCryptoFuzzer();
55 }
56 AMediaCrypto_delete(crypto);
57 return 0;
58 }
59