Chris Wailes | 2be2626 | 2019-01-11 16:14:43 -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 | package com.android.internal.os; |
| 18 | |
| 19 | import java.util.ArrayList; |
| 20 | import java.util.Arrays; |
| 21 | |
| 22 | /** |
| 23 | * Handles argument parsing for args related to the zygote spawner. |
| 24 | * |
| 25 | * Current recognized args: |
| 26 | * <ul> |
| 27 | * <li> --setuid=<i>uid of child process, defaults to 0</i> |
| 28 | * <li> --setgid=<i>gid of child process, defaults to 0</i> |
| 29 | * <li> --setgroups=<i>comma-separated list of supplimentary gid's</i> |
| 30 | * <li> --capabilities=<i>a pair of comma-separated integer strings |
| 31 | * indicating Linux capabilities(2) set for child. The first string |
| 32 | * represents the <code>permitted</code> set, and the second the |
| 33 | * <code>effective</code> set. Precede each with 0 or |
| 34 | * 0x for octal or hexidecimal value. If unspecified, both default to 0. |
| 35 | * This parameter is only applied if the uid of the new process will |
| 36 | * be non-0. </i> |
| 37 | * <li> --rlimit=r,c,m<i>tuple of values for setrlimit() call. |
| 38 | * <code>r</code> is the resource, <code>c</code> and <code>m</code> |
| 39 | * are the settings for current and max value.</i> |
| 40 | * <li> --instruction-set=<i>instruction-set-string</i> which instruction set to use/emulate. |
| 41 | * <li> --nice-name=<i>nice name to appear in ps</i> |
| 42 | * <li> --package-name=<i>package name this process belongs to</i> |
| 43 | * <li> --runtime-args indicates that the remaining arg list should |
| 44 | * be handed off to com.android.internal.os.RuntimeInit, rather than |
| 45 | * processed directly. |
| 46 | * Android runtime startup (eg, Binder initialization) is also eschewed. |
| 47 | * <li> [--] <args for RuntimeInit > |
| 48 | * </ul> |
| 49 | */ |
| 50 | class ZygoteArguments { |
| 51 | |
| 52 | /** |
| 53 | * from --setuid |
| 54 | */ |
| 55 | int mUid = 0; |
| 56 | boolean mUidSpecified; |
| 57 | |
| 58 | /** |
| 59 | * from --setgid |
| 60 | */ |
| 61 | int mGid = 0; |
| 62 | boolean mGidSpecified; |
| 63 | |
| 64 | /** |
| 65 | * from --setgroups |
| 66 | */ |
| 67 | int[] mGids; |
| 68 | |
| 69 | /** |
| 70 | * From --runtime-flags. |
| 71 | */ |
| 72 | int mRuntimeFlags; |
| 73 | |
| 74 | /** |
| 75 | * From --mount-external |
| 76 | */ |
| 77 | int mMountExternal = Zygote.MOUNT_EXTERNAL_NONE; |
| 78 | |
| 79 | /** |
| 80 | * from --target-sdk-version. |
| 81 | */ |
| 82 | int mTargetSdkVersion; |
| 83 | boolean mTargetSdkVersionSpecified; |
| 84 | |
| 85 | /** |
| 86 | * from --nice-name |
| 87 | */ |
| 88 | String mNiceName; |
| 89 | |
| 90 | /** |
| 91 | * from --capabilities |
| 92 | */ |
| 93 | boolean mCapabilitiesSpecified; |
| 94 | long mPermittedCapabilities; |
| 95 | long mEffectiveCapabilities; |
| 96 | |
| 97 | /** |
| 98 | * from --seinfo |
| 99 | */ |
| 100 | boolean mSeInfoSpecified; |
| 101 | String mSeInfo; |
| 102 | |
| 103 | /** |
Chris Wailes | db132a3 | 2019-02-20 10:49:27 -0800 | [diff] [blame] | 104 | * |
| 105 | */ |
| 106 | boolean mBlastulaPoolEnabled; |
| 107 | boolean mBlastulaPoolStatusSpecified = false; |
| 108 | |
| 109 | /** |
Chris Wailes | 2be2626 | 2019-01-11 16:14:43 -0800 | [diff] [blame] | 110 | * from all --rlimit=r,c,m |
| 111 | */ |
| 112 | ArrayList<int[]> mRLimits; |
| 113 | |
| 114 | /** |
| 115 | * from --invoke-with |
| 116 | */ |
| 117 | String mInvokeWith; |
| 118 | |
| 119 | /** from --package-name */ |
| 120 | String mPackageName; |
| 121 | |
| 122 | /** from --packages-for-uid */ |
| 123 | String[] mPackagesForUid; |
| 124 | |
Sudheer Shanka | 03fd40b | 2019-02-06 12:39:14 -0800 | [diff] [blame] | 125 | /** from --sandbox-id */ |
| 126 | String mSandboxId; |
| 127 | |
Chris Wailes | 2be2626 | 2019-01-11 16:14:43 -0800 | [diff] [blame] | 128 | /** |
| 129 | * Any args after and including the first non-option arg (or after a '--') |
| 130 | */ |
| 131 | String[] mRemainingArgs; |
| 132 | |
| 133 | /** |
| 134 | * Whether the current arguments constitute an ABI list query. |
| 135 | */ |
| 136 | boolean mAbiListQuery; |
| 137 | |
| 138 | /** |
| 139 | * The instruction set to use, or null when not important. |
| 140 | */ |
| 141 | String mInstructionSet; |
| 142 | |
| 143 | /** |
| 144 | * The app data directory. May be null, e.g., for the system server. Note that this might not be |
| 145 | * reliable in the case of process-sharing apps. |
| 146 | */ |
| 147 | String mAppDataDir; |
| 148 | |
| 149 | /** |
| 150 | * The APK path of the package to preload, when using --preload-package. |
| 151 | */ |
| 152 | String mPreloadPackage; |
| 153 | |
| 154 | /** |
| 155 | * A Base64 string representing a serialize ApplicationInfo Parcel, |
| 156 | when using --preload-app. |
| 157 | */ |
| 158 | String mPreloadApp; |
| 159 | |
| 160 | /** |
| 161 | * The native library path of the package to preload, when using --preload-package. |
| 162 | */ |
| 163 | String mPreloadPackageLibs; |
| 164 | |
| 165 | /** |
| 166 | * The filename of the native library to preload, when using --preload-package. |
| 167 | */ |
| 168 | String mPreloadPackageLibFileName; |
| 169 | |
| 170 | /** |
| 171 | * The cache key under which to enter the preloaded package into the classloader cache, when |
| 172 | * using --preload-package. |
| 173 | */ |
| 174 | String mPreloadPackageCacheKey; |
| 175 | |
| 176 | /** |
| 177 | * Whether this is a request to start preloading the default resources and classes. This |
| 178 | * argument only makes sense when the zygote is in lazy preload mode (i.e, when it's started |
| 179 | * with --enable-lazy-preload). |
| 180 | */ |
| 181 | boolean mPreloadDefault; |
| 182 | |
| 183 | /** |
| 184 | * Whether this is a request to start a zygote process as a child of this zygote. Set with |
| 185 | * --start-child-zygote. The remaining arguments must include the CHILD_ZYGOTE_SOCKET_NAME_ARG |
| 186 | * flag to indicate the abstract socket name that should be used for communication. |
| 187 | */ |
| 188 | boolean mStartChildZygote; |
| 189 | |
| 190 | /** |
| 191 | * Whether the current arguments constitute a request for the zygote's PID. |
| 192 | */ |
| 193 | boolean mPidQuery; |
| 194 | |
| 195 | /** |
| 196 | * Exemptions from API blacklisting. These are sent to the pre-forked zygote at boot time, or |
| 197 | * when they change, via --set-api-blacklist-exemptions. |
| 198 | */ |
| 199 | String[] mApiBlacklistExemptions; |
| 200 | |
| 201 | /** |
| 202 | * Sampling rate for logging hidden API accesses to the event log. This is sent to the |
| 203 | * pre-forked zygote at boot time, or when it changes, via --hidden-api-log-sampling-rate. |
| 204 | */ |
| 205 | int mHiddenApiAccessLogSampleRate = -1; |
| 206 | |
| 207 | /** |
| 208 | * Constructs instance and parses args |
| 209 | * |
| 210 | * @param args zygote command-line args |
| 211 | */ |
| 212 | ZygoteArguments(String[] args) throws IllegalArgumentException { |
| 213 | parseArgs(args); |
| 214 | } |
| 215 | |
| 216 | /** |
| 217 | * Parses the commandline arguments intended for the Zygote spawner (such as "--setuid=" and |
| 218 | * "--setgid=") and creates an array containing the remaining args. |
| 219 | * |
| 220 | * Per security review bug #1112214, duplicate args are disallowed in critical cases to make |
| 221 | * injection harder. |
| 222 | */ |
Chris Wailes | b13bfc5 | 2019-02-20 11:19:48 -0800 | [diff] [blame] | 223 | private void parseArgs(String[] args) throws IllegalArgumentException { |
| 224 | /* |
| 225 | * See android.os.ZygoteProcess.zygoteSendArgsAndGetResult() |
| 226 | * Presently the wire format to the zygote process is: |
| 227 | * a) a count of arguments (argc, in essence) |
| 228 | * b) a number of newline-separated argument strings equal to count |
| 229 | * |
| 230 | * After the zygote process reads these it will write the pid of |
| 231 | * the child or -1 on failure. |
| 232 | */ |
| 233 | |
Chris Wailes | 2be2626 | 2019-01-11 16:14:43 -0800 | [diff] [blame] | 234 | int curArg = 0; |
| 235 | |
| 236 | boolean seenRuntimeArgs = false; |
| 237 | |
| 238 | boolean expectRuntimeArgs = true; |
| 239 | for ( /* curArg */ ; curArg < args.length; curArg++) { |
| 240 | String arg = args[curArg]; |
| 241 | |
| 242 | if (arg.equals("--")) { |
| 243 | curArg++; |
| 244 | break; |
| 245 | } else if (arg.startsWith("--setuid=")) { |
| 246 | if (mUidSpecified) { |
| 247 | throw new IllegalArgumentException( |
| 248 | "Duplicate arg specified"); |
| 249 | } |
| 250 | mUidSpecified = true; |
| 251 | mUid = Integer.parseInt( |
| 252 | arg.substring(arg.indexOf('=') + 1)); |
| 253 | } else if (arg.startsWith("--setgid=")) { |
| 254 | if (mGidSpecified) { |
| 255 | throw new IllegalArgumentException( |
| 256 | "Duplicate arg specified"); |
| 257 | } |
| 258 | mGidSpecified = true; |
| 259 | mGid = Integer.parseInt( |
| 260 | arg.substring(arg.indexOf('=') + 1)); |
| 261 | } else if (arg.startsWith("--target-sdk-version=")) { |
| 262 | if (mTargetSdkVersionSpecified) { |
| 263 | throw new IllegalArgumentException( |
| 264 | "Duplicate target-sdk-version specified"); |
| 265 | } |
| 266 | mTargetSdkVersionSpecified = true; |
| 267 | mTargetSdkVersion = Integer.parseInt( |
| 268 | arg.substring(arg.indexOf('=') + 1)); |
| 269 | } else if (arg.equals("--runtime-args")) { |
| 270 | seenRuntimeArgs = true; |
| 271 | } else if (arg.startsWith("--runtime-flags=")) { |
| 272 | mRuntimeFlags = Integer.parseInt( |
| 273 | arg.substring(arg.indexOf('=') + 1)); |
| 274 | } else if (arg.startsWith("--seinfo=")) { |
| 275 | if (mSeInfoSpecified) { |
| 276 | throw new IllegalArgumentException( |
| 277 | "Duplicate arg specified"); |
| 278 | } |
| 279 | mSeInfoSpecified = true; |
| 280 | mSeInfo = arg.substring(arg.indexOf('=') + 1); |
| 281 | } else if (arg.startsWith("--capabilities=")) { |
| 282 | if (mCapabilitiesSpecified) { |
| 283 | throw new IllegalArgumentException( |
| 284 | "Duplicate arg specified"); |
| 285 | } |
| 286 | mCapabilitiesSpecified = true; |
| 287 | String capString = arg.substring(arg.indexOf('=') + 1); |
| 288 | |
| 289 | String[] capStrings = capString.split(",", 2); |
| 290 | |
| 291 | if (capStrings.length == 1) { |
| 292 | mEffectiveCapabilities = Long.decode(capStrings[0]); |
| 293 | mPermittedCapabilities = mEffectiveCapabilities; |
| 294 | } else { |
| 295 | mPermittedCapabilities = Long.decode(capStrings[0]); |
| 296 | mEffectiveCapabilities = Long.decode(capStrings[1]); |
| 297 | } |
| 298 | } else if (arg.startsWith("--rlimit=")) { |
| 299 | // Duplicate --rlimit arguments are specifically allowed. |
| 300 | String[] limitStrings = arg.substring(arg.indexOf('=') + 1).split(","); |
| 301 | |
| 302 | if (limitStrings.length != 3) { |
| 303 | throw new IllegalArgumentException( |
| 304 | "--rlimit= should have 3 comma-delimited ints"); |
| 305 | } |
| 306 | int[] rlimitTuple = new int[limitStrings.length]; |
| 307 | |
| 308 | for (int i = 0; i < limitStrings.length; i++) { |
| 309 | rlimitTuple[i] = Integer.parseInt(limitStrings[i]); |
| 310 | } |
| 311 | |
| 312 | if (mRLimits == null) { |
| 313 | mRLimits = new ArrayList(); |
| 314 | } |
| 315 | |
| 316 | mRLimits.add(rlimitTuple); |
| 317 | } else if (arg.startsWith("--setgroups=")) { |
| 318 | if (mGids != null) { |
| 319 | throw new IllegalArgumentException( |
| 320 | "Duplicate arg specified"); |
| 321 | } |
| 322 | |
| 323 | String[] params = arg.substring(arg.indexOf('=') + 1).split(","); |
| 324 | |
| 325 | mGids = new int[params.length]; |
| 326 | |
| 327 | for (int i = params.length - 1; i >= 0; i--) { |
| 328 | mGids[i] = Integer.parseInt(params[i]); |
| 329 | } |
| 330 | } else if (arg.equals("--invoke-with")) { |
| 331 | if (mInvokeWith != null) { |
| 332 | throw new IllegalArgumentException( |
| 333 | "Duplicate arg specified"); |
| 334 | } |
| 335 | try { |
| 336 | mInvokeWith = args[++curArg]; |
| 337 | } catch (IndexOutOfBoundsException ex) { |
| 338 | throw new IllegalArgumentException( |
| 339 | "--invoke-with requires argument"); |
| 340 | } |
| 341 | } else if (arg.startsWith("--nice-name=")) { |
| 342 | if (mNiceName != null) { |
| 343 | throw new IllegalArgumentException( |
| 344 | "Duplicate arg specified"); |
| 345 | } |
| 346 | mNiceName = arg.substring(arg.indexOf('=') + 1); |
| 347 | } else if (arg.equals("--mount-external-default")) { |
| 348 | mMountExternal = Zygote.MOUNT_EXTERNAL_DEFAULT; |
| 349 | } else if (arg.equals("--mount-external-read")) { |
| 350 | mMountExternal = Zygote.MOUNT_EXTERNAL_READ; |
| 351 | } else if (arg.equals("--mount-external-write")) { |
| 352 | mMountExternal = Zygote.MOUNT_EXTERNAL_WRITE; |
| 353 | } else if (arg.equals("--mount-external-full")) { |
| 354 | mMountExternal = Zygote.MOUNT_EXTERNAL_FULL; |
| 355 | } else if (arg.equals("--mount-external-installer")) { |
| 356 | mMountExternal = Zygote.MOUNT_EXTERNAL_INSTALLER; |
Jeff Sharkey | 5bf9d72 | 2019-01-23 23:52:11 -0700 | [diff] [blame] | 357 | } else if (arg.equals("--mount-external-legacy")) { |
| 358 | mMountExternal = Zygote.MOUNT_EXTERNAL_LEGACY; |
Chris Wailes | 2be2626 | 2019-01-11 16:14:43 -0800 | [diff] [blame] | 359 | } else if (arg.equals("--query-abi-list")) { |
| 360 | mAbiListQuery = true; |
| 361 | } else if (arg.equals("--get-pid")) { |
| 362 | mPidQuery = true; |
| 363 | } else if (arg.startsWith("--instruction-set=")) { |
| 364 | mInstructionSet = arg.substring(arg.indexOf('=') + 1); |
| 365 | } else if (arg.startsWith("--app-data-dir=")) { |
| 366 | mAppDataDir = arg.substring(arg.indexOf('=') + 1); |
| 367 | } else if (arg.equals("--preload-app")) { |
| 368 | mPreloadApp = args[++curArg]; |
| 369 | } else if (arg.equals("--preload-package")) { |
| 370 | mPreloadPackage = args[++curArg]; |
| 371 | mPreloadPackageLibs = args[++curArg]; |
| 372 | mPreloadPackageLibFileName = args[++curArg]; |
| 373 | mPreloadPackageCacheKey = args[++curArg]; |
| 374 | } else if (arg.equals("--preload-default")) { |
| 375 | mPreloadDefault = true; |
| 376 | expectRuntimeArgs = false; |
| 377 | } else if (arg.equals("--start-child-zygote")) { |
| 378 | mStartChildZygote = true; |
| 379 | } else if (arg.equals("--set-api-blacklist-exemptions")) { |
| 380 | // consume all remaining args; this is a stand-alone command, never included |
| 381 | // with the regular fork command. |
| 382 | mApiBlacklistExemptions = Arrays.copyOfRange(args, curArg + 1, args.length); |
| 383 | curArg = args.length; |
| 384 | expectRuntimeArgs = false; |
| 385 | } else if (arg.startsWith("--hidden-api-log-sampling-rate=")) { |
| 386 | String rateStr = arg.substring(arg.indexOf('=') + 1); |
| 387 | try { |
| 388 | mHiddenApiAccessLogSampleRate = Integer.parseInt(rateStr); |
| 389 | } catch (NumberFormatException nfe) { |
| 390 | throw new IllegalArgumentException( |
| 391 | "Invalid log sampling rate: " + rateStr, nfe); |
| 392 | } |
| 393 | expectRuntimeArgs = false; |
| 394 | } else if (arg.startsWith("--package-name=")) { |
| 395 | if (mPackageName != null) { |
| 396 | throw new IllegalArgumentException("Duplicate arg specified"); |
| 397 | } |
| 398 | mPackageName = arg.substring(arg.indexOf('=') + 1); |
| 399 | } else if (arg.startsWith("--packages-for-uid=")) { |
| 400 | mPackagesForUid = arg.substring(arg.indexOf('=') + 1).split(","); |
Sudheer Shanka | 03fd40b | 2019-02-06 12:39:14 -0800 | [diff] [blame] | 401 | } else if (arg.startsWith("--sandbox-id=")) { |
| 402 | if (mSandboxId != null) { |
| 403 | throw new IllegalArgumentException("Duplicate arg specified"); |
| 404 | } |
| 405 | mSandboxId = arg.substring(arg.indexOf('=') + 1); |
Chris Wailes | db132a3 | 2019-02-20 10:49:27 -0800 | [diff] [blame] | 406 | } else if (arg.startsWith("--blastula-pool-enabled=")) { |
| 407 | mBlastulaPoolStatusSpecified = true; |
| 408 | mBlastulaPoolEnabled = Boolean.parseBoolean(arg.substring(arg.indexOf('=') + 1)); |
| 409 | expectRuntimeArgs = false; |
Chris Wailes | 2be2626 | 2019-01-11 16:14:43 -0800 | [diff] [blame] | 410 | } else { |
| 411 | break; |
| 412 | } |
| 413 | } |
| 414 | |
| 415 | if (mAbiListQuery || mPidQuery) { |
| 416 | if (args.length - curArg > 0) { |
| 417 | throw new IllegalArgumentException("Unexpected arguments after --query-abi-list."); |
| 418 | } |
| 419 | } else if (mPreloadPackage != null) { |
| 420 | if (args.length - curArg > 0) { |
| 421 | throw new IllegalArgumentException( |
| 422 | "Unexpected arguments after --preload-package."); |
| 423 | } |
| 424 | } else if (mPreloadApp != null) { |
| 425 | if (args.length - curArg > 0) { |
| 426 | throw new IllegalArgumentException( |
| 427 | "Unexpected arguments after --preload-app."); |
| 428 | } |
| 429 | } else if (expectRuntimeArgs) { |
| 430 | if (!seenRuntimeArgs) { |
| 431 | throw new IllegalArgumentException("Unexpected argument : " + args[curArg]); |
| 432 | } |
| 433 | |
| 434 | mRemainingArgs = new String[args.length - curArg]; |
| 435 | System.arraycopy(args, curArg, mRemainingArgs, 0, mRemainingArgs.length); |
| 436 | } |
| 437 | |
| 438 | if (mStartChildZygote) { |
| 439 | boolean seenChildSocketArg = false; |
| 440 | for (String arg : mRemainingArgs) { |
| 441 | if (arg.startsWith(Zygote.CHILD_ZYGOTE_SOCKET_NAME_ARG)) { |
| 442 | seenChildSocketArg = true; |
| 443 | break; |
| 444 | } |
| 445 | } |
| 446 | if (!seenChildSocketArg) { |
| 447 | throw new IllegalArgumentException("--start-child-zygote specified " |
| 448 | + "without " + Zygote.CHILD_ZYGOTE_SOCKET_NAME_ARG); |
| 449 | } |
| 450 | } |
| 451 | } |
| 452 | } |