1 /* 2 * Copyright (C) 2007 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 #include <sys/stat.h> 18 #include "roots.h" 19 #include "common.h" 20 21 #define CANARY_FILE "/system/build.prop" 22 #define CANARY_FILE_ROOT_PATH "SYSTEM:build.prop" 23 24 int 25 file_exists(const char *path) 26 { 27 struct stat st; 28 int ret; 29 ret = stat(path, &st); 30 if (ret == 0) { 31 return S_ISREG(st.st_mode); 32 } 33 return 0; 34 } 35 36 int 37 test_roots() 38 { 39 int ret; 40 41 /* Make sure that /system isn't mounted yet. 42 */ 43 if (file_exists(CANARY_FILE)) return -__LINE__; 44 if (is_root_path_mounted(CANARY_FILE_ROOT_PATH)) return -__LINE__; 45 46 /* Try to mount the root. 47 */ 48 ret = ensure_root_path_mounted(CANARY_FILE_ROOT_PATH); 49 if (ret < 0) return -__LINE__; 50 51 /* Make sure we can see the file now and that we know the root is mounted. 52 */ 53 if (!file_exists(CANARY_FILE)) return -__LINE__; 54 if (!is_root_path_mounted(CANARY_FILE_ROOT_PATH)) return -__LINE__; 55 56 /* Make sure that the root path corresponds to the regular path. 57 */ 58 struct stat st1, st2; 59 char buf[128]; 60 const char *path = translate_root_path(CANARY_FILE_ROOT_PATH, 61 buf, sizeof(buf)); 62 if (path == NULL) return -__LINE__; 63 ret = stat(CANARY_FILE, &st1); 64 if (ret != 0) return -__LINE__; 65 ret = stat(path, &st2); 66 if (ret != 0) return -__LINE__; 67 if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino) return -__LINE__; 68 69 /* Try to unmount the root. 70 */ 71 ret = ensure_root_path_unmounted(CANARY_FILE_ROOT_PATH); 72 if (ret < 0) return -__LINE__; 73 74 /* Make sure that we can't see the file anymore and that 75 * we don't think the root is mounted. 76 */ 77 if (file_exists(CANARY_FILE)) return -__LINE__; 78 if (is_root_path_mounted(CANARY_FILE_ROOT_PATH)) return -__LINE__; 79 80 return 0; 81 } 82
