The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 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 | #define LOG_TAG "Zygote" |
| 18 | |
| 19 | #include <sys/types.h> |
| 20 | #include <unistd.h> |
| 21 | #include <fcntl.h> |
| 22 | #include <utils/misc.h> |
| 23 | #include <errno.h> |
| 24 | #include <sys/select.h> |
| 25 | |
| 26 | #include "jni.h" |
| 27 | #include <JNIHelp.h> |
| 28 | #include "android_runtime/AndroidRuntime.h" |
| 29 | |
Nick Kralevich | b3c4a0b | 2013-02-28 16:49:43 -0800 | [diff] [blame] | 30 | #include <sys/capability.h> |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 31 | #include <sys/prctl.h> |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 32 | |
| 33 | namespace android { |
| 34 | |
| 35 | /* |
| 36 | * In class com.android.internal.os.ZygoteInit: |
| 37 | * private static native boolean setreuid(int ruid, int euid) |
| 38 | */ |
| 39 | static jint com_android_internal_os_ZygoteInit_setreuid( |
| 40 | JNIEnv* env, jobject clazz, jint ruid, jint euid) |
| 41 | { |
Andy McFadden | 05554a4 | 2011-01-10 11:22:43 -0800 | [diff] [blame] | 42 | if (setreuid(ruid, euid) < 0) { |
| 43 | return errno; |
| 44 | } |
| 45 | return 0; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 46 | } |
| 47 | |
| 48 | /* |
| 49 | * In class com.android.internal.os.ZygoteInit: |
| 50 | * private static native int setregid(int rgid, int egid) |
| 51 | */ |
| 52 | static jint com_android_internal_os_ZygoteInit_setregid( |
| 53 | JNIEnv* env, jobject clazz, jint rgid, jint egid) |
| 54 | { |
Andy McFadden | 05554a4 | 2011-01-10 11:22:43 -0800 | [diff] [blame] | 55 | if (setregid(rgid, egid) < 0) { |
| 56 | return errno; |
| 57 | } |
| 58 | return 0; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | /* |
| 62 | * In class com.android.internal.os.ZygoteInit: |
| 63 | * private static native int setpgid(int rgid, int egid) |
| 64 | */ |
| 65 | static jint com_android_internal_os_ZygoteInit_setpgid( |
| 66 | JNIEnv* env, jobject clazz, jint pid, jint pgid) |
| 67 | { |
Andy McFadden | 05554a4 | 2011-01-10 11:22:43 -0800 | [diff] [blame] | 68 | if (setpgid(pid, pgid) < 0) { |
| 69 | return errno; |
| 70 | } |
| 71 | return 0; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | /* |
| 75 | * In class com.android.internal.os.ZygoteInit: |
| 76 | * private static native int getpgid(int pid) |
| 77 | */ |
| 78 | static jint com_android_internal_os_ZygoteInit_getpgid( |
| 79 | JNIEnv* env, jobject clazz, jint pid) |
| 80 | { |
| 81 | pid_t ret; |
| 82 | ret = getpgid(pid); |
| 83 | |
| 84 | if (ret < 0) { |
| 85 | jniThrowIOException(env, errno); |
| 86 | } |
| 87 | |
| 88 | return ret; |
| 89 | } |
| 90 | |
Elliott Hughes | 69a017b | 2011-04-08 14:10:28 -0700 | [diff] [blame] | 91 | static void com_android_internal_os_ZygoteInit_reopenStdio(JNIEnv* env, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 92 | jobject clazz, jobject in, jobject out, jobject errfd) |
| 93 | { |
| 94 | int fd; |
| 95 | int err; |
| 96 | |
| 97 | fd = jniGetFDFromFileDescriptor(env, in); |
| 98 | |
| 99 | if (env->ExceptionOccurred() != NULL) { |
| 100 | return; |
| 101 | } |
| 102 | |
| 103 | do { |
| 104 | err = dup2(fd, STDIN_FILENO); |
| 105 | } while (err < 0 && errno == EINTR); |
| 106 | |
| 107 | fd = jniGetFDFromFileDescriptor(env, out); |
| 108 | |
| 109 | if (env->ExceptionOccurred() != NULL) { |
| 110 | return; |
| 111 | } |
| 112 | |
| 113 | do { |
| 114 | err = dup2(fd, STDOUT_FILENO); |
| 115 | } while (err < 0 && errno == EINTR); |
| 116 | |
| 117 | fd = jniGetFDFromFileDescriptor(env, errfd); |
| 118 | |
| 119 | if (env->ExceptionOccurred() != NULL) { |
| 120 | return; |
| 121 | } |
| 122 | |
| 123 | do { |
| 124 | err = dup2(fd, STDERR_FILENO); |
| 125 | } while (err < 0 && errno == EINTR); |
| 126 | } |
| 127 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 128 | static void com_android_internal_os_ZygoteInit_setCloseOnExec (JNIEnv *env, |
| 129 | jobject clazz, jobject descriptor, jboolean flag) |
| 130 | { |
| 131 | int fd; |
| 132 | int err; |
| 133 | int fdFlags; |
| 134 | |
| 135 | fd = jniGetFDFromFileDescriptor(env, descriptor); |
| 136 | |
| 137 | if (env->ExceptionOccurred() != NULL) { |
| 138 | return; |
| 139 | } |
| 140 | |
| 141 | fdFlags = fcntl(fd, F_GETFD); |
| 142 | |
| 143 | if (fdFlags < 0) { |
| 144 | jniThrowIOException(env, errno); |
| 145 | return; |
| 146 | } |
| 147 | |
| 148 | if (flag) { |
| 149 | fdFlags |= FD_CLOEXEC; |
| 150 | } else { |
| 151 | fdFlags &= ~FD_CLOEXEC; |
| 152 | } |
| 153 | |
| 154 | err = fcntl(fd, F_SETFD, fdFlags); |
| 155 | |
| 156 | if (err < 0) { |
| 157 | jniThrowIOException(env, errno); |
| 158 | return; |
| 159 | } |
| 160 | } |
| 161 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 162 | static jlong com_android_internal_os_ZygoteInit_capgetPermitted (JNIEnv *env, |
| 163 | jobject clazz, jint pid) |
| 164 | { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 165 | struct __user_cap_header_struct capheader; |
| 166 | struct __user_cap_data_struct capdata; |
| 167 | int err; |
| 168 | |
| 169 | memset (&capheader, 0, sizeof(capheader)); |
| 170 | memset (&capdata, 0, sizeof(capdata)); |
| 171 | |
| 172 | capheader.version = _LINUX_CAPABILITY_VERSION; |
| 173 | capheader.pid = pid; |
| 174 | |
Elliott Hughes | 69a017b | 2011-04-08 14:10:28 -0700 | [diff] [blame] | 175 | err = capget (&capheader, &capdata); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 176 | |
| 177 | if (err < 0) { |
| 178 | jniThrowIOException(env, errno); |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | return (jlong) capdata.permitted; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | static jint com_android_internal_os_ZygoteInit_selectReadable ( |
Elliott Hughes | 69a017b | 2011-04-08 14:10:28 -0700 | [diff] [blame] | 186 | JNIEnv *env, jobject clazz, jobjectArray fds) |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 187 | { |
| 188 | if (fds == NULL) { |
Elliott Hughes | 69a017b | 2011-04-08 14:10:28 -0700 | [diff] [blame] | 189 | jniThrowNullPointerException(env, "fds == null"); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 190 | return -1; |
| 191 | } |
| 192 | |
| 193 | jsize length = env->GetArrayLength(fds); |
| 194 | fd_set fdset; |
| 195 | |
| 196 | if (env->ExceptionOccurred() != NULL) { |
| 197 | return -1; |
| 198 | } |
| 199 | |
| 200 | FD_ZERO(&fdset); |
| 201 | |
| 202 | int nfds = 0; |
| 203 | for (jsize i = 0; i < length; i++) { |
| 204 | jobject fdObj = env->GetObjectArrayElement(fds, i); |
| 205 | if (env->ExceptionOccurred() != NULL) { |
| 206 | return -1; |
| 207 | } |
| 208 | if (fdObj == NULL) { |
| 209 | continue; |
| 210 | } |
| 211 | int fd = jniGetFDFromFileDescriptor(env, fdObj); |
| 212 | if (env->ExceptionOccurred() != NULL) { |
| 213 | return -1; |
| 214 | } |
| 215 | |
| 216 | FD_SET(fd, &fdset); |
| 217 | |
| 218 | if (fd >= nfds) { |
| 219 | nfds = fd + 1; |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | int err; |
| 224 | do { |
| 225 | err = select (nfds, &fdset, NULL, NULL, NULL); |
| 226 | } while (err < 0 && errno == EINTR); |
| 227 | |
| 228 | if (err < 0) { |
| 229 | jniThrowIOException(env, errno); |
| 230 | return -1; |
| 231 | } |
| 232 | |
| 233 | for (jsize i = 0; i < length; i++) { |
| 234 | jobject fdObj = env->GetObjectArrayElement(fds, i); |
| 235 | if (env->ExceptionOccurred() != NULL) { |
| 236 | return -1; |
| 237 | } |
| 238 | if (fdObj == NULL) { |
| 239 | continue; |
| 240 | } |
| 241 | int fd = jniGetFDFromFileDescriptor(env, fdObj); |
| 242 | if (env->ExceptionOccurred() != NULL) { |
| 243 | return -1; |
| 244 | } |
| 245 | if (FD_ISSET(fd, &fdset)) { |
| 246 | return (jint)i; |
| 247 | } |
| 248 | } |
| 249 | return -1; |
| 250 | } |
| 251 | |
| 252 | static jobject com_android_internal_os_ZygoteInit_createFileDescriptor ( |
Elliott Hughes | 69a017b | 2011-04-08 14:10:28 -0700 | [diff] [blame] | 253 | JNIEnv *env, jobject clazz, jint fd) |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 254 | { |
| 255 | return jniCreateFileDescriptor(env, fd); |
| 256 | } |
| 257 | |
| 258 | /* |
| 259 | * JNI registration. |
| 260 | */ |
| 261 | static JNINativeMethod gMethods[] = { |
| 262 | /* name, signature, funcPtr */ |
| 263 | { "setreuid", "(II)I", |
| 264 | (void*) com_android_internal_os_ZygoteInit_setreuid }, |
| 265 | { "setregid", "(II)I", |
| 266 | (void*) com_android_internal_os_ZygoteInit_setregid }, |
| 267 | { "setpgid", "(II)I", |
| 268 | (void *) com_android_internal_os_ZygoteInit_setpgid }, |
| 269 | { "getpgid", "(I)I", |
| 270 | (void *) com_android_internal_os_ZygoteInit_getpgid }, |
Elliott Hughes | 69a017b | 2011-04-08 14:10:28 -0700 | [diff] [blame] | 271 | { "reopenStdio", |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 272 | "(Ljava/io/FileDescriptor;Ljava/io/FileDescriptor;" |
Elliott Hughes | 69a017b | 2011-04-08 14:10:28 -0700 | [diff] [blame] | 273 | "Ljava/io/FileDescriptor;)V", |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 274 | (void *) com_android_internal_os_ZygoteInit_reopenStdio}, |
Elliott Hughes | 69a017b | 2011-04-08 14:10:28 -0700 | [diff] [blame] | 275 | { "setCloseOnExec", "(Ljava/io/FileDescriptor;Z)V", |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 276 | (void *) com_android_internal_os_ZygoteInit_setCloseOnExec}, |
Elliott Hughes | 69a017b | 2011-04-08 14:10:28 -0700 | [diff] [blame] | 277 | { "capgetPermitted", "(I)J", |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 278 | (void *) com_android_internal_os_ZygoteInit_capgetPermitted }, |
| 279 | { "selectReadable", "([Ljava/io/FileDescriptor;)I", |
| 280 | (void *) com_android_internal_os_ZygoteInit_selectReadable }, |
| 281 | { "createFileDescriptor", "(I)Ljava/io/FileDescriptor;", |
| 282 | (void *) com_android_internal_os_ZygoteInit_createFileDescriptor } |
| 283 | }; |
| 284 | int register_com_android_internal_os_ZygoteInit(JNIEnv* env) |
| 285 | { |
| 286 | return AndroidRuntime::registerNativeMethods(env, |
| 287 | "com/android/internal/os/ZygoteInit", gMethods, NELEM(gMethods)); |
| 288 | } |
| 289 | |
| 290 | }; // namespace android |