1 /* 2 * Copyright (C) 2010 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 <android_runtime/AndroidRuntime.h> 18 #include <nativehelper/JNIHelp.h> 19 #include <jni.h> 20 #include <nativehelper/ScopedUtfChars.h> 21 22 #include <utils/misc.h> 23 #include <sys/ioctl.h> 24 #include <sys/mount.h> 25 #include <utils/Log.h> 26 27 28 #include <inttypes.h> 29 #include <fcntl.h> 30 #include <errno.h> 31 #include <string.h> 32 33 namespace android { 34 get_block_device_size(int fd)35 uint64_t get_block_device_size(int fd) 36 { 37 uint64_t size = 0; 38 int ret; 39 40 ret = ioctl(fd, BLKGETSIZE64, &size); 41 42 if (ret) 43 return 0; 44 45 return size; 46 } 47 wipe_block_device(int fd)48 int wipe_block_device(int fd) 49 { 50 uint64_t range[2]; 51 int ret; 52 uint64_t len = get_block_device_size(fd); 53 54 range[0] = 0; 55 range[1] = len; 56 57 if (range[1] == 0) 58 return 0; 59 60 ret = ioctl(fd, BLKSECDISCARD, &range); 61 if (ret < 0) { 62 ALOGE("Something went wrong secure discarding block: %s\n", strerror(errno)); 63 range[0] = 0; 64 range[1] = len; 65 ret = ioctl(fd, BLKDISCARD, &range); 66 if (ret < 0) { 67 ALOGE("Discard failed: %s\n", strerror(errno)); 68 return -1; 69 } else { 70 ALOGE("Wipe via secure discard failed, used non-secure discard instead\n"); 71 return 0; 72 } 73 74 } 75 76 return ret; 77 } 78 com_android_server_PersistentDataBlockService_getBlockDeviceSize(JNIEnv * env,jclass,jstring jpath)79 static jlong com_android_server_PersistentDataBlockService_getBlockDeviceSize(JNIEnv *env, jclass, jstring jpath) 80 { 81 ScopedUtfChars path(env, jpath); 82 int fd = open(path.c_str(), O_RDONLY); 83 84 if (fd < 0) 85 return 0; 86 87 const uint64_t size = get_block_device_size(fd); 88 89 close(fd); 90 91 return size; 92 } 93 com_android_server_PersistentDataBlockService_wipe(JNIEnv * env,jclass,jstring jpath)94 static int com_android_server_PersistentDataBlockService_wipe(JNIEnv *env, jclass, jstring jpath) { 95 ScopedUtfChars path(env, jpath); 96 int fd = open(path.c_str(), O_WRONLY); 97 98 if (fd < 0) 99 return 0; 100 101 const int ret = wipe_block_device(fd); 102 103 close(fd); 104 105 return ret; 106 } 107 108 static const JNINativeMethod sMethods[] = { 109 /* name, signature, funcPtr */ 110 {"nativeGetBlockDeviceSize", "(Ljava/lang/String;)J", (void*)com_android_server_PersistentDataBlockService_getBlockDeviceSize}, 111 {"nativeWipe", "(Ljava/lang/String;)I", (void*)com_android_server_PersistentDataBlockService_wipe}, 112 }; 113 register_android_server_PersistentDataBlockService(JNIEnv * env)114 int register_android_server_PersistentDataBlockService(JNIEnv* env) 115 { 116 return jniRegisterNativeMethods(env, "com/android/server/PersistentDataBlockService", 117 sMethods, NELEM(sMethods)); 118 } 119 120 } /* namespace android */