hostsidetests/securitybulletin/securityPatch/CVE-2020-0470/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 <stdlib.h>
#include "../includes/common.h"

// This PoC is only for 64-bit builds
#if _64_BIT
#include <media/NdkMediaCodec.h>

#define DEQUEUE_BUFFER_TIMEOUT_MICROSECONDS 1000
#define TOTAL_TIMEOUT_MICROSECONDS (300 * 1000 * 1000)
#define FILE_SIZE 72
#define VIDEO_MAX_WIDTH 176
#define VIDEO_MAX_HEIGHT 144
#endif /* _64_BIT */

int main(int argc, char *argv[]) {
    (void)argc;
    (void)argv;

// This PoC is only for 64-bit builds
#if _64_BIT
    if (argc != 2) {
        return EXIT_FAILURE;
    }

    FILE *inFile = fopen(argv[1], "rb");
    if (!inFile) {
        return EXIT_FAILURE;
    }
    AMediaCodec *codec;
    media_status_t status;
    int64_t inActiveTime = 0ll;
    bool isEncoder = false;

    codec = AMediaCodec_createCodecByName("c2.android.av1.decoder");
    if (!codec) {
        fclose(inFile);
        return EXIT_FAILURE;
    }
    /* Set Format */
    AMediaFormat *format = AMediaFormat_new();
    if (!format) {
        fclose(inFile);
        AMediaCodec_delete(codec);
        return EXIT_FAILURE;
    }
    AMediaFormat_setString(format, AMEDIAFORMAT_KEY_MIME, "video/av01");
    AMediaFormat_setInt32(format, AMEDIAFORMAT_KEY_MAX_INPUT_SIZE, FILE_SIZE);
    AMediaFormat_setInt32(format, AMEDIAFORMAT_KEY_WIDTH, VIDEO_MAX_WIDTH);
    AMediaFormat_setInt32(format, AMEDIAFORMAT_KEY_HEIGHT, VIDEO_MAX_HEIGHT);
    AMediaCodec_configure(codec, format, nullptr, nullptr, isEncoder);
    AMediaCodec_start(codec);

    size_t filePos = 0;
    bool inputEOS = false;
    while (inActiveTime < TOTAL_TIMEOUT_MICROSECONDS) {
        /* Queue input data */
        if (!inputEOS) {
            uint32_t bufferFlags = 0;
            ssize_t inIdx =
                AMediaCodec_dequeueInputBuffer(codec, DEQUEUE_BUFFER_TIMEOUT_MICROSECONDS);
            if (inIdx >= 0) {
                ssize_t bytesRead = 0;
                size_t bufSize;
                uint8_t *buf = AMediaCodec_getInputBuffer(codec, inIdx, &bufSize);
                if (filePos < FILE_SIZE) {
                    bytesRead = fread(buf, 1, FILE_SIZE, inFile);
                    filePos += FILE_SIZE;
                    fseek(inFile, filePos, SEEK_SET);
                }
                if (bytesRead <= 0) {
                    bytesRead = 0;
                    inputEOS = true;
                    bufferFlags |= AMEDIACODEC_BUFFER_FLAG_END_OF_STREAM;
                }
                status = AMediaCodec_queueInputBuffer(codec, inIdx, 0, bytesRead, 0, bufferFlags);
                if (status != AMEDIA_OK) {
                    break;
                }
                inActiveTime = 0;
            } else if (inIdx == AMEDIACODEC_INFO_TRY_AGAIN_LATER) {
                inActiveTime += DEQUEUE_BUFFER_TIMEOUT_MICROSECONDS;
            } else {
                break;
            }
        }
        /* Dequeue output */
        AMediaCodecBufferInfo info;
        ssize_t outIdx =
            AMediaCodec_dequeueOutputBuffer(codec, &info, DEQUEUE_BUFFER_TIMEOUT_MICROSECONDS);
        if (outIdx == AMEDIACODEC_INFO_OUTPUT_FORMAT_CHANGED ||
            outIdx == AMEDIACODEC_INFO_OUTPUT_BUFFERS_CHANGED) {
            inActiveTime = 0;
        } else if (outIdx >= 0) {
            status = AMediaCodec_releaseOutputBuffer(codec, outIdx, false);
            if (status != AMEDIA_OK) {
                break;
            }
            if (info.flags & AMEDIACODEC_BUFFER_FLAG_END_OF_STREAM) {
                break;
            }
            inActiveTime = 0;
        } else if (outIdx == AMEDIACODEC_INFO_TRY_AGAIN_LATER) {
            inActiveTime += DEQUEUE_BUFFER_TIMEOUT_MICROSECONDS;
        } else {
            break;
        }
    }
    AMediaFormat_delete(format);
    AMediaCodec_stop(codec);
    AMediaCodec_delete(codec);
    fclose(inFile);
#endif /* _64_BIT */

    return EXIT_SUCCESS;
}