InstalldNativeService.cpp revision 2fc82a9b9319753c72acbbd7cbc5ce535e1a173b
1/* 2** Copyright 2008, 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 "InstalldNativeService.h" 18 19#include <errno.h> 20#include <inttypes.h> 21#include <fstream> 22#include <fts.h> 23#include <regex> 24#include <stdlib.h> 25#include <string.h> 26#include <sys/capability.h> 27#include <sys/file.h> 28#include <sys/resource.h> 29#include <sys/quota.h> 30#include <sys/stat.h> 31#include <sys/statvfs.h> 32#include <sys/types.h> 33#include <sys/wait.h> 34#include <sys/xattr.h> 35#include <unistd.h> 36 37#include <android-base/logging.h> 38#include <android-base/stringprintf.h> 39#include <android-base/strings.h> 40#include <android-base/unique_fd.h> 41#include <cutils/fs.h> 42#include <cutils/log.h> // TODO: Move everything to base/logging. 43#include <cutils/properties.h> 44#include <cutils/sched_policy.h> 45#include <logwrap/logwrap.h> 46#include <private/android_filesystem_config.h> 47#include <selinux/android.h> 48#include <system/thread_defs.h> 49 50#include "dexopt.h" 51#include "globals.h" 52#include "installd_deps.h" 53#include "otapreopt_utils.h" 54#include "utils.h" 55 56#ifndef LOG_TAG 57#define LOG_TAG "installd" 58#endif 59 60#define MEASURE_EXTERNAL 0 61 62using android::base::StringPrintf; 63 64namespace android { 65namespace installd { 66 67static constexpr const char* kCpPath = "/system/bin/cp"; 68static constexpr const char* kXattrDefault = "user.default"; 69 70static constexpr const int MIN_RESTRICTED_HOME_SDK_VERSION = 24; // > M 71 72static constexpr const char* PKG_LIB_POSTFIX = "/lib"; 73static constexpr const char* CACHE_DIR_POSTFIX = "/cache"; 74static constexpr const char* CODE_CACHE_DIR_POSTFIX = "/code_cache"; 75 76static constexpr const char* IDMAP_PREFIX = "/data/resource-cache/"; 77static constexpr const char* IDMAP_SUFFIX = "@idmap"; 78 79// NOTE: keep in sync with StorageManager 80static constexpr int FLAG_STORAGE_DE = 1 << 0; 81static constexpr int FLAG_STORAGE_CE = 1 << 1; 82 83// NOTE: keep in sync with Installer 84static constexpr int FLAG_CLEAR_CACHE_ONLY = 1 << 8; 85static constexpr int FLAG_CLEAR_CODE_CACHE_ONLY = 1 << 9; 86static constexpr int FLAG_USE_QUOTA = 1 << 12; 87 88namespace { 89 90constexpr const char* kDump = "android.permission.DUMP"; 91 92static binder::Status ok() { 93 return binder::Status::ok(); 94} 95 96static binder::Status exception(uint32_t code, const std::string& msg) { 97 return binder::Status::fromExceptionCode(code, String8(msg.c_str())); 98} 99 100static binder::Status error() { 101 return binder::Status::fromServiceSpecificError(errno); 102} 103 104static binder::Status error(const std::string& msg) { 105 PLOG(ERROR) << msg; 106 return binder::Status::fromServiceSpecificError(errno, String8(msg.c_str())); 107} 108 109static binder::Status error(uint32_t code, const std::string& msg) { 110 LOG(ERROR) << msg << " (" << code << ")"; 111 return binder::Status::fromServiceSpecificError(code, String8(msg.c_str())); 112} 113 114binder::Status checkPermission(const char* permission) { 115 pid_t pid; 116 uid_t uid; 117 118 if (checkCallingPermission(String16(permission), reinterpret_cast<int32_t*>(&pid), 119 reinterpret_cast<int32_t*>(&uid))) { 120 return ok(); 121 } else { 122 return exception(binder::Status::EX_SECURITY, 123 StringPrintf("UID %d / PID %d lacks permission %s", uid, pid, permission)); 124 } 125} 126 127binder::Status checkUid(uid_t expectedUid) { 128 uid_t uid = IPCThreadState::self()->getCallingUid(); 129 if (uid == expectedUid || uid == AID_ROOT) { 130 return ok(); 131 } else { 132 return exception(binder::Status::EX_SECURITY, 133 StringPrintf("UID %d is not expected UID %d", uid, expectedUid)); 134 } 135} 136 137binder::Status checkArgumentUuid(const std::unique_ptr<std::string>& uuid) { 138 if (!uuid || is_valid_filename(*uuid)) { 139 return ok(); 140 } else { 141 return exception(binder::Status::EX_ILLEGAL_ARGUMENT, 142 StringPrintf("UUID %s is malformed", uuid->c_str())); 143 } 144} 145 146binder::Status checkArgumentPackageName(const std::string& packageName) { 147 if (is_valid_package_name(packageName.c_str())) { 148 return ok(); 149 } else { 150 return exception(binder::Status::EX_ILLEGAL_ARGUMENT, 151 StringPrintf("Package name %s is malformed", packageName.c_str())); 152 } 153} 154 155#define ENFORCE_UID(uid) { \ 156 binder::Status status = checkUid((uid)); \ 157 if (!status.isOk()) { \ 158 return status; \ 159 } \ 160} 161 162#define CHECK_ARGUMENT_UUID(uuid) { \ 163 binder::Status status = checkArgumentUuid((uuid)); \ 164 if (!status.isOk()) { \ 165 return status; \ 166 } \ 167} 168 169#define CHECK_ARGUMENT_PACKAGE_NAME(packageName) { \ 170 binder::Status status = \ 171 checkArgumentPackageName((packageName)); \ 172 if (!status.isOk()) { \ 173 return status; \ 174 } \ 175} 176 177} // namespace 178 179status_t InstalldNativeService::start() { 180 IPCThreadState::self()->disableBackgroundScheduling(true); 181 status_t ret = BinderService<InstalldNativeService>::publish(); 182 if (ret != android::OK) { 183 return ret; 184 } 185 sp<ProcessState> ps(ProcessState::self()); 186 ps->startThreadPool(); 187 ps->giveThreadPoolName(); 188 return android::OK; 189} 190 191status_t InstalldNativeService::dump(int fd, const Vector<String16> & /* args */) { 192 const binder::Status dump_permission = checkPermission(kDump); 193 if (!dump_permission.isOk()) { 194 const String8 msg(dump_permission.toString8()); 195 write(fd, msg.string(), msg.size()); 196 return PERMISSION_DENIED; 197 } 198 199 std::string msg = "installd is happy\n"; 200 write(fd, msg.c_str(), strlen(msg.c_str())); 201 return NO_ERROR; 202} 203 204/** 205 * Perform restorecon of the given path, but only perform recursive restorecon 206 * if the label of that top-level file actually changed. This can save us 207 * significant time by avoiding no-op traversals of large filesystem trees. 208 */ 209static int restorecon_app_data_lazy(const std::string& path, const std::string& seInfo, uid_t uid, 210 bool existing) { 211 int res = 0; 212 char* before = nullptr; 213 char* after = nullptr; 214 215 // Note that SELINUX_ANDROID_RESTORECON_DATADATA flag is set by 216 // libselinux. Not needed here. 217 218 if (lgetfilecon(path.c_str(), &before) < 0) { 219 PLOG(ERROR) << "Failed before getfilecon for " << path; 220 goto fail; 221 } 222 if (selinux_android_restorecon_pkgdir(path.c_str(), seInfo.c_str(), uid, 0) < 0) { 223 PLOG(ERROR) << "Failed top-level restorecon for " << path; 224 goto fail; 225 } 226 if (lgetfilecon(path.c_str(), &after) < 0) { 227 PLOG(ERROR) << "Failed after getfilecon for " << path; 228 goto fail; 229 } 230 231 // If the initial top-level restorecon above changed the label, then go 232 // back and restorecon everything recursively 233 if (strcmp(before, after)) { 234 if (existing) { 235 LOG(DEBUG) << "Detected label change from " << before << " to " << after << " at " 236 << path << "; running recursive restorecon"; 237 } 238 if (selinux_android_restorecon_pkgdir(path.c_str(), seInfo.c_str(), uid, 239 SELINUX_ANDROID_RESTORECON_RECURSE) < 0) { 240 PLOG(ERROR) << "Failed recursive restorecon for " << path; 241 goto fail; 242 } 243 } 244 245 goto done; 246fail: 247 res = -1; 248done: 249 free(before); 250 free(after); 251 return res; 252} 253 254static int restorecon_app_data_lazy(const std::string& parent, const char* name, 255 const std::string& seInfo, uid_t uid, bool existing) { 256 return restorecon_app_data_lazy(StringPrintf("%s/%s", parent.c_str(), name), seInfo, uid, 257 existing); 258} 259 260static int prepare_app_dir(const std::string& path, mode_t target_mode, uid_t uid) { 261 if (fs_prepare_dir_strict(path.c_str(), target_mode, uid, uid) != 0) { 262 PLOG(ERROR) << "Failed to prepare " << path; 263 return -1; 264 } 265 return 0; 266} 267 268/** 269 * Prepare an app cache directory, which offers to fix-up the GID and 270 * directory mode flags during a platform upgrade. 271 */ 272static int prepare_app_cache_dir(const std::string& parent, const char* name, mode_t target_mode, 273 uid_t uid, gid_t gid) { 274 auto path = StringPrintf("%s/%s", parent.c_str(), name); 275 struct stat st; 276 if (stat(path.c_str(), &st) != 0) { 277 if (errno == ENOENT) { 278 // This is fine, just create it 279 if (fs_prepare_dir_strict(path.c_str(), target_mode, uid, gid) != 0) { 280 PLOG(ERROR) << "Failed to prepare " << path; 281 return -1; 282 } else { 283 return 0; 284 } 285 } else { 286 PLOG(ERROR) << "Failed to stat " << path; 287 return -1; 288 } 289 } 290 291 if (st.st_uid != uid) { 292 // Mismatched UID is real trouble; we can't recover 293 LOG(ERROR) << "Mismatched UID at " << path << ": found " << st.st_uid 294 << " but expected " << uid; 295 return -1; 296 } else if (st.st_gid == gid && st.st_mode == target_mode) { 297 // Everything looks good! 298 return 0; 299 } 300 301 // Directory is owned correctly, but GID or mode mismatch means it's 302 // probably a platform upgrade so we need to fix them 303 FTS *fts; 304 FTSENT *p; 305 char *argv[] = { (char*) path.c_str(), nullptr }; 306 if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_XDEV, NULL))) { 307 PLOG(ERROR) << "Failed to fts_open " << path; 308 return -1; 309 } 310 while ((p = fts_read(fts)) != NULL) { 311 switch (p->fts_info) { 312 case FTS_DP: 313 if (chmod(p->fts_accpath, target_mode) != 0) { 314 PLOG(WARNING) << "Failed to chmod " << p->fts_path; 315 } 316 // Intentional fall through to also set GID 317 case FTS_F: 318 if (chown(p->fts_accpath, -1, gid) != 0) { 319 PLOG(WARNING) << "Failed to chown " << p->fts_path; 320 } 321 break; 322 case FTS_SL: 323 case FTS_SLNONE: 324 if (lchown(p->fts_accpath, -1, gid) != 0) { 325 PLOG(WARNING) << "Failed to chown " << p->fts_path; 326 } 327 break; 328 } 329 } 330 fts_close(fts); 331 return 0; 332} 333 334binder::Status InstalldNativeService::createAppData(const std::unique_ptr<std::string>& uuid, 335 const std::string& packageName, int32_t userId, int32_t flags, int32_t appId, 336 const std::string& seInfo, int32_t targetSdkVersion, int64_t* _aidl_return) { 337 ENFORCE_UID(AID_SYSTEM); 338 CHECK_ARGUMENT_UUID(uuid); 339 CHECK_ARGUMENT_PACKAGE_NAME(packageName); 340 341 const char* uuid_ = uuid ? uuid->c_str() : nullptr; 342 const char* pkgname = packageName.c_str(); 343 344 // Assume invalid inode unless filled in below 345 if (_aidl_return != nullptr) *_aidl_return = -1; 346 347 uid_t uid = multiuser_get_uid(userId, appId); 348 gid_t cacheGid = multiuser_get_cache_gid(userId, appId); 349 mode_t targetMode = targetSdkVersion >= MIN_RESTRICTED_HOME_SDK_VERSION ? 0700 : 0751; 350 351 if (flags & FLAG_STORAGE_CE) { 352 auto path = create_data_user_ce_package_path(uuid_, userId, pkgname); 353 bool existing = (access(path.c_str(), F_OK) == 0); 354 355 if (prepare_app_dir(path, targetMode, uid) || 356 prepare_app_cache_dir(path, "cache", 02771, uid, cacheGid) || 357 prepare_app_cache_dir(path, "code_cache", 02771, uid, cacheGid)) { 358 return error("Failed to prepare " + path); 359 } 360 361 // Consider restorecon over contents if label changed 362 if (restorecon_app_data_lazy(path, seInfo, uid, existing) || 363 restorecon_app_data_lazy(path, "cache", seInfo, uid, existing) || 364 restorecon_app_data_lazy(path, "code_cache", seInfo, uid, existing)) { 365 return error("Failed to restorecon " + path); 366 } 367 368 // Remember inode numbers of cache directories so that we can clear 369 // contents while CE storage is locked 370 if (write_path_inode(path, "cache", kXattrInodeCache) || 371 write_path_inode(path, "code_cache", kXattrInodeCodeCache)) { 372 return error("Failed to write_path_inode for " + path); 373 } 374 375 // And return the CE inode of the top-level data directory so we can 376 // clear contents while CE storage is locked 377 if ((_aidl_return != nullptr) 378 && get_path_inode(path, reinterpret_cast<ino_t*>(_aidl_return)) != 0) { 379 return error("Failed to get_path_inode for " + path); 380 } 381 } 382 if (flags & FLAG_STORAGE_DE) { 383 auto path = create_data_user_de_package_path(uuid_, userId, pkgname); 384 bool existing = (access(path.c_str(), F_OK) == 0); 385 386 if (prepare_app_dir(path, targetMode, uid) || 387 prepare_app_cache_dir(path, "cache", 02771, uid, cacheGid) || 388 prepare_app_cache_dir(path, "code_cache", 02771, uid, cacheGid)) { 389 return error("Failed to prepare " + path); 390 } 391 392 // Consider restorecon over contents if label changed 393 if (restorecon_app_data_lazy(path, seInfo, uid, existing)) { 394 return error("Failed to restorecon " + path); 395 } 396 397 if (property_get_bool("dalvik.vm.usejitprofiles", false)) { 398 const std::string profile_path = create_data_user_profile_package_path(userId, pkgname); 399 // read-write-execute only for the app user. 400 if (fs_prepare_dir_strict(profile_path.c_str(), 0700, uid, uid) != 0) { 401 return error("Failed to prepare " + profile_path); 402 } 403 std::string profile_file = create_primary_profile(profile_path); 404 // read-write only for the app user. 405 if (fs_prepare_file_strict(profile_file.c_str(), 0600, uid, uid) != 0) { 406 return error("Failed to prepare " + profile_path); 407 } 408 const std::string ref_profile_path = create_data_ref_profile_package_path(pkgname); 409 // dex2oat/profman runs under the shared app gid and it needs to read/write reference 410 // profiles. 411 int shared_app_gid = multiuser_get_shared_gid(0, appId); 412 if ((shared_app_gid != -1) && fs_prepare_dir_strict( 413 ref_profile_path.c_str(), 0700, shared_app_gid, shared_app_gid) != 0) { 414 return error("Failed to prepare " + ref_profile_path); 415 } 416 } 417 } 418 return ok(); 419} 420 421binder::Status InstalldNativeService::migrateAppData(const std::unique_ptr<std::string>& uuid, 422 const std::string& packageName, int32_t userId, int32_t flags) { 423 ENFORCE_UID(AID_SYSTEM); 424 CHECK_ARGUMENT_UUID(uuid); 425 CHECK_ARGUMENT_PACKAGE_NAME(packageName); 426 427 const char* uuid_ = uuid ? uuid->c_str() : nullptr; 428 const char* pkgname = packageName.c_str(); 429 430 // This method only exists to upgrade system apps that have requested 431 // forceDeviceEncrypted, so their default storage always lives in a 432 // consistent location. This only works on non-FBE devices, since we 433 // never want to risk exposing data on a device with real CE/DE storage. 434 435 auto ce_path = create_data_user_ce_package_path(uuid_, userId, pkgname); 436 auto de_path = create_data_user_de_package_path(uuid_, userId, pkgname); 437 438 // If neither directory is marked as default, assume CE is default 439 if (getxattr(ce_path.c_str(), kXattrDefault, nullptr, 0) == -1 440 && getxattr(de_path.c_str(), kXattrDefault, nullptr, 0) == -1) { 441 if (setxattr(ce_path.c_str(), kXattrDefault, nullptr, 0, 0) != 0) { 442 return error("Failed to mark default storage " + ce_path); 443 } 444 } 445 446 // Migrate default data location if needed 447 auto target = (flags & FLAG_STORAGE_DE) ? de_path : ce_path; 448 auto source = (flags & FLAG_STORAGE_DE) ? ce_path : de_path; 449 450 if (getxattr(target.c_str(), kXattrDefault, nullptr, 0) == -1) { 451 LOG(WARNING) << "Requested default storage " << target 452 << " is not active; migrating from " << source; 453 if (delete_dir_contents_and_dir(target) != 0) { 454 return error("Failed to delete " + target); 455 } 456 if (rename(source.c_str(), target.c_str()) != 0) { 457 return error("Failed to rename " + source + " to " + target); 458 } 459 } 460 461 return ok(); 462} 463 464 465binder::Status InstalldNativeService::clearAppProfiles(const std::string& packageName) { 466 ENFORCE_UID(AID_SYSTEM); 467 CHECK_ARGUMENT_PACKAGE_NAME(packageName); 468 469 const char* pkgname = packageName.c_str(); 470 binder::Status res = ok(); 471 if (!clear_reference_profile(pkgname)) { 472 res = error("Failed to clear reference profile for " + packageName); 473 } 474 if (!clear_current_profiles(pkgname)) { 475 res = error("Failed to clear current profiles for " + packageName); 476 } 477 return res; 478} 479 480binder::Status InstalldNativeService::clearAppData(const std::unique_ptr<std::string>& uuid, 481 const std::string& packageName, int32_t userId, int32_t flags, int64_t ceDataInode) { 482 ENFORCE_UID(AID_SYSTEM); 483 CHECK_ARGUMENT_UUID(uuid); 484 CHECK_ARGUMENT_PACKAGE_NAME(packageName); 485 486 const char* uuid_ = uuid ? uuid->c_str() : nullptr; 487 const char* pkgname = packageName.c_str(); 488 489 binder::Status res = ok(); 490 if (flags & FLAG_STORAGE_CE) { 491 auto path = create_data_user_ce_package_path(uuid_, userId, pkgname, ceDataInode); 492 if (flags & FLAG_CLEAR_CACHE_ONLY) { 493 path = read_path_inode(path, "cache", kXattrInodeCache); 494 } else if (flags & FLAG_CLEAR_CODE_CACHE_ONLY) { 495 path = read_path_inode(path, "code_cache", kXattrInodeCodeCache); 496 } 497 if (access(path.c_str(), F_OK) == 0) { 498 if (delete_dir_contents(path) != 0) { 499 res = error("Failed to delete contents of " + path); 500 } 501 } 502 } 503 if (flags & FLAG_STORAGE_DE) { 504 std::string suffix = ""; 505 bool only_cache = false; 506 if (flags & FLAG_CLEAR_CACHE_ONLY) { 507 suffix = CACHE_DIR_POSTFIX; 508 only_cache = true; 509 } else if (flags & FLAG_CLEAR_CODE_CACHE_ONLY) { 510 suffix = CODE_CACHE_DIR_POSTFIX; 511 only_cache = true; 512 } 513 514 auto path = create_data_user_de_package_path(uuid_, userId, pkgname) + suffix; 515 if (access(path.c_str(), F_OK) == 0) { 516 if (delete_dir_contents(path) != 0) { 517 res = error("Failed to delete contents of " + path); 518 } 519 } 520 if (!only_cache) { 521 if (!clear_current_profile(pkgname, userId)) { 522 res = error("Failed to clear current profile for " + packageName); 523 } 524 } 525 } 526 return res; 527} 528 529static int destroy_app_reference_profile(const char *pkgname) { 530 return delete_dir_contents_and_dir( 531 create_data_ref_profile_package_path(pkgname), 532 /*ignore_if_missing*/ true); 533} 534 535static int destroy_app_current_profiles(const char *pkgname, userid_t userid) { 536 return delete_dir_contents_and_dir( 537 create_data_user_profile_package_path(userid, pkgname), 538 /*ignore_if_missing*/ true); 539} 540 541binder::Status InstalldNativeService::destroyAppProfiles(const std::string& packageName) { 542 ENFORCE_UID(AID_SYSTEM); 543 CHECK_ARGUMENT_PACKAGE_NAME(packageName); 544 545 const char* pkgname = packageName.c_str(); 546 binder::Status res = ok(); 547 std::vector<userid_t> users = get_known_users(/*volume_uuid*/ nullptr); 548 for (auto user : users) { 549 if (destroy_app_current_profiles(pkgname, user) != 0) { 550 res = error("Failed to destroy current profiles for " + packageName); 551 } 552 } 553 if (destroy_app_reference_profile(pkgname) != 0) { 554 res = error("Failed to destroy reference profile for " + packageName); 555 } 556 return res; 557} 558 559binder::Status InstalldNativeService::destroyAppData(const std::unique_ptr<std::string>& uuid, 560 const std::string& packageName, int32_t userId, int32_t flags, int64_t ceDataInode) { 561 ENFORCE_UID(AID_SYSTEM); 562 CHECK_ARGUMENT_UUID(uuid); 563 CHECK_ARGUMENT_PACKAGE_NAME(packageName); 564 565 const char* uuid_ = uuid ? uuid->c_str() : nullptr; 566 const char* pkgname = packageName.c_str(); 567 568 binder::Status res = ok(); 569 if (flags & FLAG_STORAGE_CE) { 570 auto path = create_data_user_ce_package_path(uuid_, userId, pkgname, ceDataInode); 571 if (delete_dir_contents_and_dir(path) != 0) { 572 res = error("Failed to delete " + path); 573 } 574 } 575 if (flags & FLAG_STORAGE_DE) { 576 auto path = create_data_user_de_package_path(uuid_, userId, pkgname); 577 if (delete_dir_contents_and_dir(path) != 0) { 578 res = error("Failed to delete " + path); 579 } 580 destroy_app_current_profiles(pkgname, userId); 581 // TODO(calin): If the package is still installed by other users it's probably 582 // beneficial to keep the reference profile around. 583 // Verify if it's ok to do that. 584 destroy_app_reference_profile(pkgname); 585 } 586 return res; 587} 588 589binder::Status InstalldNativeService::moveCompleteApp(const std::unique_ptr<std::string>& fromUuid, 590 const std::unique_ptr<std::string>& toUuid, const std::string& packageName, 591 const std::string& dataAppName, int32_t appId, const std::string& seInfo, 592 int32_t targetSdkVersion) { 593 ENFORCE_UID(AID_SYSTEM); 594 CHECK_ARGUMENT_UUID(fromUuid); 595 CHECK_ARGUMENT_UUID(toUuid); 596 CHECK_ARGUMENT_PACKAGE_NAME(packageName); 597 598 const char* from_uuid = fromUuid ? fromUuid->c_str() : nullptr; 599 const char* to_uuid = toUuid ? toUuid->c_str() : nullptr; 600 const char* package_name = packageName.c_str(); 601 const char* data_app_name = dataAppName.c_str(); 602 603 binder::Status res = ok(); 604 std::vector<userid_t> users = get_known_users(from_uuid); 605 606 // Copy app 607 { 608 auto from = create_data_app_package_path(from_uuid, data_app_name); 609 auto to = create_data_app_package_path(to_uuid, data_app_name); 610 auto to_parent = create_data_app_path(to_uuid); 611 612 char *argv[] = { 613 (char*) kCpPath, 614 (char*) "-F", /* delete any existing destination file first (--remove-destination) */ 615 (char*) "-p", /* preserve timestamps, ownership, and permissions */ 616 (char*) "-R", /* recurse into subdirectories (DEST must be a directory) */ 617 (char*) "-P", /* Do not follow symlinks [default] */ 618 (char*) "-d", /* don't dereference symlinks */ 619 (char*) from.c_str(), 620 (char*) to_parent.c_str() 621 }; 622 623 LOG(DEBUG) << "Copying " << from << " to " << to; 624 int rc = android_fork_execvp(ARRAY_SIZE(argv), argv, NULL, false, true); 625 if (rc != 0) { 626 res = error(rc, "Failed copying " + from + " to " + to); 627 goto fail; 628 } 629 630 if (selinux_android_restorecon(to.c_str(), SELINUX_ANDROID_RESTORECON_RECURSE) != 0) { 631 res = error("Failed to restorecon " + to); 632 goto fail; 633 } 634 } 635 636 // Copy private data for all known users 637 for (auto user : users) { 638 639 // Data source may not exist for all users; that's okay 640 auto from_ce = create_data_user_ce_package_path(from_uuid, user, package_name); 641 if (access(from_ce.c_str(), F_OK) != 0) { 642 LOG(INFO) << "Missing source " << from_ce; 643 continue; 644 } 645 646 if (!createAppData(toUuid, packageName, user, FLAG_STORAGE_CE | FLAG_STORAGE_DE, appId, 647 seInfo, targetSdkVersion, nullptr).isOk()) { 648 res = error("Failed to create package target"); 649 goto fail; 650 } 651 652 char *argv[] = { 653 (char*) kCpPath, 654 (char*) "-F", /* delete any existing destination file first (--remove-destination) */ 655 (char*) "-p", /* preserve timestamps, ownership, and permissions */ 656 (char*) "-R", /* recurse into subdirectories (DEST must be a directory) */ 657 (char*) "-P", /* Do not follow symlinks [default] */ 658 (char*) "-d", /* don't dereference symlinks */ 659 nullptr, 660 nullptr 661 }; 662 663 { 664 auto from = create_data_user_de_package_path(from_uuid, user, package_name); 665 auto to = create_data_user_de_path(to_uuid, user); 666 argv[6] = (char*) from.c_str(); 667 argv[7] = (char*) to.c_str(); 668 669 LOG(DEBUG) << "Copying " << from << " to " << to; 670 int rc = android_fork_execvp(ARRAY_SIZE(argv), argv, NULL, false, true); 671 if (rc != 0) { 672 res = error(rc, "Failed copying " + from + " to " + to); 673 goto fail; 674 } 675 } 676 { 677 auto from = create_data_user_ce_package_path(from_uuid, user, package_name); 678 auto to = create_data_user_ce_path(to_uuid, user); 679 argv[6] = (char*) from.c_str(); 680 argv[7] = (char*) to.c_str(); 681 682 LOG(DEBUG) << "Copying " << from << " to " << to; 683 int rc = android_fork_execvp(ARRAY_SIZE(argv), argv, NULL, false, true); 684 if (rc != 0) { 685 res = error(rc, "Failed copying " + from + " to " + to); 686 goto fail; 687 } 688 } 689 690 if (!restoreconAppData(toUuid, packageName, user, FLAG_STORAGE_CE | FLAG_STORAGE_DE, 691 appId, seInfo).isOk()) { 692 res = error("Failed to restorecon"); 693 goto fail; 694 } 695 } 696 697 // We let the framework scan the new location and persist that before 698 // deleting the data in the old location; this ordering ensures that 699 // we can recover from things like battery pulls. 700 return ok(); 701 702fail: 703 // Nuke everything we might have already copied 704 { 705 auto to = create_data_app_package_path(to_uuid, data_app_name); 706 if (delete_dir_contents(to.c_str(), 1, NULL) != 0) { 707 LOG(WARNING) << "Failed to rollback " << to; 708 } 709 } 710 for (auto user : users) { 711 { 712 auto to = create_data_user_de_package_path(to_uuid, user, package_name); 713 if (delete_dir_contents(to.c_str(), 1, NULL) != 0) { 714 LOG(WARNING) << "Failed to rollback " << to; 715 } 716 } 717 { 718 auto to = create_data_user_ce_package_path(to_uuid, user, package_name); 719 if (delete_dir_contents(to.c_str(), 1, NULL) != 0) { 720 LOG(WARNING) << "Failed to rollback " << to; 721 } 722 } 723 } 724 return res; 725} 726 727binder::Status InstalldNativeService::createUserData(const std::unique_ptr<std::string>& uuid, 728 int32_t userId, int32_t userSerial ATTRIBUTE_UNUSED, int32_t flags) { 729 ENFORCE_UID(AID_SYSTEM); 730 CHECK_ARGUMENT_UUID(uuid); 731 732 const char* uuid_ = uuid ? uuid->c_str() : nullptr; 733 if (flags & FLAG_STORAGE_DE) { 734 if (uuid_ == nullptr) { 735 if (ensure_config_user_dirs(userId) != 0) { 736 return error(StringPrintf("Failed to ensure dirs for %d", userId)); 737 } 738 } 739 } 740 return ok(); 741} 742 743binder::Status InstalldNativeService::destroyUserData(const std::unique_ptr<std::string>& uuid, 744 int32_t userId, int32_t flags) { 745 ENFORCE_UID(AID_SYSTEM); 746 CHECK_ARGUMENT_UUID(uuid); 747 748 const char* uuid_ = uuid ? uuid->c_str() : nullptr; 749 binder::Status res = ok(); 750 if (flags & FLAG_STORAGE_DE) { 751 auto path = create_data_user_de_path(uuid_, userId); 752 if (delete_dir_contents_and_dir(path, true) != 0) { 753 res = error("Failed to delete " + path); 754 } 755 if (uuid_ == nullptr) { 756 path = create_data_misc_legacy_path(userId); 757 if (delete_dir_contents_and_dir(path, true) != 0) { 758 res = error("Failed to delete " + path); 759 } 760 path = create_data_user_profiles_path(userId); 761 if (delete_dir_contents_and_dir(path, true) != 0) { 762 res = error("Failed to delete " + path); 763 } 764 } 765 } 766 if (flags & FLAG_STORAGE_CE) { 767 auto path = create_data_user_ce_path(uuid_, userId); 768 if (delete_dir_contents_and_dir(path, true) != 0) { 769 res = error("Failed to delete " + path); 770 } 771 path = create_data_media_path(uuid_, userId); 772 if (delete_dir_contents_and_dir(path, true) != 0) { 773 res = error("Failed to delete " + path); 774 } 775 } 776 return res; 777} 778 779/* Try to ensure free_size bytes of storage are available. 780 * Returns 0 on success. 781 * This is rather simple-minded because doing a full LRU would 782 * be potentially memory-intensive, and without atime it would 783 * also require that apps constantly modify file metadata even 784 * when just reading from the cache, which is pretty awful. 785 */ 786binder::Status InstalldNativeService::freeCache(const std::unique_ptr<std::string>& uuid, 787 int64_t freeStorageSize) { 788 ENFORCE_UID(AID_SYSTEM); 789 CHECK_ARGUMENT_UUID(uuid); 790 791 const char* uuid_ = uuid ? uuid->c_str() : nullptr; 792 cache_t* cache; 793 int64_t avail; 794 795 auto data_path = create_data_path(uuid_); 796 797 avail = data_disk_free(data_path); 798 if (avail < 0) { 799 return error("Failed to determine free space for " + data_path); 800 } 801 802 ALOGI("free_cache(%" PRId64 ") avail %" PRId64 "\n", freeStorageSize, avail); 803 if (avail >= freeStorageSize) { 804 return ok(); 805 } 806 807 cache = start_cache_collection(); 808 809 auto users = get_known_users(uuid_); 810 for (auto user : users) { 811 add_cache_files(cache, create_data_user_ce_path(uuid_, user)); 812 add_cache_files(cache, create_data_user_de_path(uuid_, user)); 813 add_cache_files(cache, 814 StringPrintf("%s/Android/data", create_data_media_path(uuid_, user).c_str())); 815 } 816 817 clear_cache_files(data_path, cache, freeStorageSize); 818 finish_cache_collection(cache); 819 820 avail = data_disk_free(data_path); 821 if (avail >= freeStorageSize) { 822 return ok(); 823 } else { 824 return error(StringPrintf("Failed to free up %" PRId64 " on %s; final free space %" PRId64, 825 freeStorageSize, data_path.c_str(), avail)); 826 } 827} 828 829binder::Status InstalldNativeService::rmdex(const std::string& codePath, 830 const std::string& instructionSet) { 831 ENFORCE_UID(AID_SYSTEM); 832 char dex_path[PKG_PATH_MAX]; 833 834 const char* path = codePath.c_str(); 835 const char* instruction_set = instructionSet.c_str(); 836 837 if (validate_apk_path(path) && validate_system_app_path(path)) { 838 return error("Invalid path " + codePath); 839 } 840 841 if (!create_cache_path(dex_path, path, instruction_set)) { 842 return error("Failed to create cache path for " + codePath); 843 } 844 845 ALOGV("unlink %s\n", dex_path); 846 if (unlink(dex_path) < 0) { 847 return error(StringPrintf("Failed to unlink %s", dex_path)); 848 } else { 849 return ok(); 850 } 851} 852 853static bool uuidEquals(const std::unique_ptr<std::string>& a, 854 const std::unique_ptr<std::string>& b) { 855 if (!a && !b) { 856 return true; 857 } else if (!a && b) { 858 return false; 859 } else if (a && !b) { 860 return false; 861 } else { 862 return *a == *b; 863 } 864} 865 866struct stats { 867 int64_t codeSize; 868 int64_t dataSize; 869 int64_t cacheSize; 870}; 871 872static void collectQuotaStats(const std::unique_ptr<std::string>& uuid, int32_t userId, 873 int32_t appId, struct stats* stats) { 874 struct dqblk dq; 875 876 auto path = create_data_path(uuid ? uuid->c_str() : nullptr); 877 std::string device; 878 { 879 std::ifstream in("/proc/mounts"); 880 if (!in.is_open()) { 881 PLOG(ERROR) << "Failed to read mounts"; 882 return; 883 } 884 std::string source; 885 std::string target; 886 while (!in.eof()) { 887 std::getline(in, source, ' '); 888 std::getline(in, target, ' '); 889 if (target == path) { 890 device = source; 891 break; 892 } 893 // Skip to next line 894 std::getline(in, source); 895 } 896 } 897 if (device.empty()) { 898 PLOG(ERROR) << "Failed to resolve block device for " << path; 899 return; 900 } 901 902 uid_t uid = multiuser_get_uid(userId, appId); 903 if (quotactl(QCMD(Q_GETQUOTA, USRQUOTA), device.c_str(), uid, 904 reinterpret_cast<char*>(&dq)) != 0) { 905 if (errno != ESRCH) { 906 PLOG(ERROR) << "Failed to quotactl " << device << " for UID " << uid; 907 } 908 } else { 909 stats->dataSize += dq.dqb_curspace; 910 } 911 912 int cacheGid = multiuser_get_cache_gid(userId, appId); 913 if (cacheGid != -1) { 914 if (quotactl(QCMD(Q_GETQUOTA, GRPQUOTA), device.c_str(), cacheGid, 915 reinterpret_cast<char*>(&dq)) != 0) { 916 if (errno != ESRCH) { 917 PLOG(ERROR) << "Failed to quotactl " << device << " for GID " << cacheGid; 918 } 919 } else { 920 stats->cacheSize += dq.dqb_curspace; 921 } 922 } 923 924 int sharedGid = multiuser_get_shared_app_gid(uid); 925 if (sharedGid != -1) { 926 if (quotactl(QCMD(Q_GETQUOTA, GRPQUOTA), device.c_str(), sharedGid, 927 reinterpret_cast<char*>(&dq)) != 0) { 928 if (errno != ESRCH) { 929 PLOG(ERROR) << "Failed to quotactl " << device << " for GID " << sharedGid; 930 } 931 } else { 932 stats->codeSize += dq.dqb_curspace; 933 } 934 } 935} 936 937static void collectManualStats(std::string& path, struct stats* stats) { 938 DIR *d; 939 int dfd; 940 struct dirent *de; 941 struct stat s; 942 943 d = opendir(path.c_str()); 944 if (d == nullptr) { 945 if (errno != ENOENT) { 946 PLOG(WARNING) << "Failed to open " << path; 947 } 948 return; 949 } 950 dfd = dirfd(d); 951 while ((de = readdir(d))) { 952 const char *name = de->d_name; 953 954 int64_t size = 0; 955 if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) { 956 size = s.st_blocks * 512; 957 } 958 959 if (de->d_type == DT_DIR) { 960 if (!strcmp(name, ".")) { 961 // Don't recurse, but still count node size 962 } else if (!strcmp(name, "..")) { 963 // Don't recurse or count node size 964 continue; 965 } else { 966 // Measure all children nodes 967 size = 0; 968 calculate_tree_size(StringPrintf("%s/%s", path.c_str(), name), &size); 969 } 970 971 if (!strcmp(name, "cache") || !strcmp(name, "code_cache")) { 972 stats->cacheSize += size; 973 } 974 } 975 976 // Legacy symlink isn't owned by app 977 if (de->d_type == DT_LNK && !strcmp(name, "lib")) { 978 continue; 979 } 980 981 // Everything found inside is considered data 982 stats->dataSize += size; 983 } 984 closedir(d); 985} 986 987binder::Status InstalldNativeService::getAppSize(const std::unique_ptr<std::string>& uuid, 988 const std::string& packageName, int32_t userId, int32_t flags, int32_t appId, 989 int64_t ceDataInode, const std::string& codePath, 990 const std::unique_ptr<std::string>& externalUuid, std::vector<int64_t>* _aidl_return) { 991 ENFORCE_UID(AID_SYSTEM); 992 CHECK_ARGUMENT_UUID(uuid); 993 CHECK_ARGUMENT_PACKAGE_NAME(packageName); 994 995 const char* uuid_ = uuid ? uuid->c_str() : nullptr; 996 const char* extuuid_ = externalUuid ? externalUuid->c_str() : nullptr; 997 const char* pkgname = packageName.c_str(); 998 999 // Here's a summary of the common storage locations across the platform, 1000 // and how they're each tagged: 1001 // 1002 // /data/app/com.example UID system 1003 // /data/app/com.example/oat UID system 1004 // /data/user/0/com.example UID u0_a10 GID u0_a10 1005 // /data/user/0/com.example/cache UID u0_a10 GID u0_a10_cache 1006 // /data/media/0/Android/data/com.example UID u0_a10 GID u0_a10 1007 // /data/media/0/Android/data/com.example/cache UID u0_a10 GID u0_a10_cache 1008 // /data/media/0/Android/obb/com.example UID system 1009 1010 struct stats stats; 1011 memset(&stats, 0, sizeof(stats)); 1012 1013 auto obbCodePath = create_data_media_package_path(extuuid_, userId, pkgname, "obb"); 1014 calculate_tree_size(obbCodePath, &stats.codeSize); 1015 1016 if (flags & FLAG_USE_QUOTA) { 1017 calculate_tree_size(codePath, &stats.codeSize, 1018 0, multiuser_get_shared_gid(userId, appId)); 1019 1020 collectQuotaStats(uuid, userId, appId, &stats); 1021 1022 // If external storage lives on a different storage device, also 1023 // collect quota stats from that block device 1024 if (!uuidEquals(uuid, externalUuid)) { 1025 collectQuotaStats(externalUuid, userId, appId, &stats); 1026 } 1027 } else { 1028 calculate_tree_size(codePath, &stats.codeSize); 1029 1030 auto cePath = create_data_user_ce_package_path(uuid_, userId, pkgname, ceDataInode); 1031 collectManualStats(cePath, &stats); 1032 1033 auto dePath = create_data_user_de_package_path(uuid_, userId, pkgname); 1034 collectManualStats(dePath, &stats); 1035 1036 auto userProfilePath = create_data_user_profile_package_path(userId, pkgname); 1037 calculate_tree_size(userProfilePath, &stats.dataSize); 1038 1039 auto refProfilePath = create_data_ref_profile_package_path(pkgname); 1040 calculate_tree_size(refProfilePath, &stats.codeSize); 1041 1042 calculate_tree_size(create_data_dalvik_cache_path(), &stats.codeSize, 1043 multiuser_get_shared_gid(userId, appId), 0); 1044 1045 calculate_tree_size(create_data_misc_foreign_dex_path(userId), &stats.dataSize, 1046 multiuser_get_uid(userId, appId), 0); 1047 1048#if MEASURE_EXTERNAL 1049 auto extPath = create_data_media_package_path(extuuid_, userId, pkgname, "data"); 1050 collectManualStats(extPath, &stats); 1051 1052 auto mediaPath = create_data_media_package_path(extuuid_, userId, pkgname, "media"); 1053 calculate_tree_size(mediaPath, &stats.dataSize); 1054#endif 1055 } 1056 1057 std::vector<int64_t> ret; 1058 ret.push_back(stats.codeSize); 1059 ret.push_back(stats.dataSize); 1060 ret.push_back(stats.cacheSize); 1061 *_aidl_return = ret; 1062 return ok(); 1063} 1064 1065// Dumps the contents of a profile file, using pkgname's dex files for pretty 1066// printing the result. 1067binder::Status InstalldNativeService::dumpProfiles(int32_t uid, const std::string& packageName, 1068 const std::string& codePaths, bool* _aidl_return) { 1069 ENFORCE_UID(AID_SYSTEM); 1070 CHECK_ARGUMENT_PACKAGE_NAME(packageName); 1071 1072 const char* pkgname = packageName.c_str(); 1073 const char* code_paths = codePaths.c_str(); 1074 1075 *_aidl_return = dump_profiles(uid, pkgname, code_paths); 1076 return ok(); 1077} 1078 1079// TODO: Consider returning error codes. 1080binder::Status InstalldNativeService::mergeProfiles(int32_t uid, const std::string& packageName, 1081 bool* _aidl_return) { 1082 ENFORCE_UID(AID_SYSTEM); 1083 CHECK_ARGUMENT_PACKAGE_NAME(packageName); 1084 1085 const char* pkgname = packageName.c_str(); 1086 *_aidl_return = analyse_profiles(uid, pkgname); 1087 return ok(); 1088} 1089 1090binder::Status InstalldNativeService::dexopt(const std::string& apkPath, int32_t uid, 1091 const std::unique_ptr<std::string>& packageName, const std::string& instructionSet, 1092 int32_t dexoptNeeded, const std::unique_ptr<std::string>& outputPath, int32_t dexFlags, 1093 const std::string& compilerFilter, const std::unique_ptr<std::string>& uuid, 1094 const std::unique_ptr<std::string>& sharedLibraries) { 1095 ENFORCE_UID(AID_SYSTEM); 1096 CHECK_ARGUMENT_UUID(uuid); 1097 if (packageName && *packageName != "*") { 1098 CHECK_ARGUMENT_PACKAGE_NAME(*packageName); 1099 } 1100 1101 const char* apk_path = apkPath.c_str(); 1102 const char* pkgname = packageName ? packageName->c_str() : "*"; 1103 const char* instruction_set = instructionSet.c_str(); 1104 const char* oat_dir = outputPath ? outputPath->c_str() : nullptr; 1105 const char* compiler_filter = compilerFilter.c_str(); 1106 const char* volume_uuid = uuid ? uuid->c_str() : nullptr; 1107 const char* shared_libraries = sharedLibraries ? sharedLibraries->c_str() : nullptr; 1108 1109 int res = android::installd::dexopt(apk_path, uid, pkgname, instruction_set, dexoptNeeded, 1110 oat_dir, dexFlags, compiler_filter, volume_uuid, shared_libraries); 1111 return res ? error(res, "Failed to dexopt") : ok(); 1112} 1113 1114binder::Status InstalldNativeService::markBootComplete(const std::string& instructionSet) { 1115 ENFORCE_UID(AID_SYSTEM); 1116 const char* instruction_set = instructionSet.c_str(); 1117 1118 char boot_marker_path[PKG_PATH_MAX]; 1119 sprintf(boot_marker_path, 1120 "%s/%s/%s/.booting", 1121 android_data_dir.path, 1122 DALVIK_CACHE, 1123 instruction_set); 1124 1125 ALOGV("mark_boot_complete : %s", boot_marker_path); 1126 if (unlink(boot_marker_path) != 0) { 1127 return error(StringPrintf("Failed to unlink %s", boot_marker_path)); 1128 } 1129 return ok(); 1130} 1131 1132void mkinnerdirs(char* path, int basepos, mode_t mode, int uid, int gid, 1133 struct stat* statbuf) 1134{ 1135 while (path[basepos] != 0) { 1136 if (path[basepos] == '/') { 1137 path[basepos] = 0; 1138 if (lstat(path, statbuf) < 0) { 1139 ALOGV("Making directory: %s\n", path); 1140 if (mkdir(path, mode) == 0) { 1141 chown(path, uid, gid); 1142 } else { 1143 ALOGW("Unable to make directory %s: %s\n", path, strerror(errno)); 1144 } 1145 } 1146 path[basepos] = '/'; 1147 basepos++; 1148 } 1149 basepos++; 1150 } 1151} 1152 1153binder::Status InstalldNativeService::linkNativeLibraryDirectory( 1154 const std::unique_ptr<std::string>& uuid, const std::string& packageName, 1155 const std::string& nativeLibPath32, int32_t userId) { 1156 ENFORCE_UID(AID_SYSTEM); 1157 CHECK_ARGUMENT_UUID(uuid); 1158 CHECK_ARGUMENT_PACKAGE_NAME(packageName); 1159 1160 const char* uuid_ = uuid ? uuid->c_str() : nullptr; 1161 const char* pkgname = packageName.c_str(); 1162 const char* asecLibDir = nativeLibPath32.c_str(); 1163 struct stat s, libStat; 1164 binder::Status res = ok(); 1165 1166 auto _pkgdir = create_data_user_ce_package_path(uuid_, userId, pkgname); 1167 auto _libsymlink = _pkgdir + PKG_LIB_POSTFIX; 1168 1169 const char* pkgdir = _pkgdir.c_str(); 1170 const char* libsymlink = _libsymlink.c_str(); 1171 1172 if (stat(pkgdir, &s) < 0) { 1173 return error("Failed to stat " + _pkgdir); 1174 } 1175 1176 if (chown(pkgdir, AID_INSTALL, AID_INSTALL) < 0) { 1177 return error("Failed to chown " + _pkgdir); 1178 } 1179 1180 if (chmod(pkgdir, 0700) < 0) { 1181 res = error("Failed to chmod " + _pkgdir); 1182 goto out; 1183 } 1184 1185 if (lstat(libsymlink, &libStat) < 0) { 1186 if (errno != ENOENT) { 1187 res = error("Failed to stat " + _libsymlink); 1188 goto out; 1189 } 1190 } else { 1191 if (S_ISDIR(libStat.st_mode)) { 1192 if (delete_dir_contents(libsymlink, 1, NULL) < 0) { 1193 res = error("Failed to delete " + _libsymlink); 1194 goto out; 1195 } 1196 } else if (S_ISLNK(libStat.st_mode)) { 1197 if (unlink(libsymlink) < 0) { 1198 res = error("Failed to unlink " + _libsymlink); 1199 goto out; 1200 } 1201 } 1202 } 1203 1204 if (symlink(asecLibDir, libsymlink) < 0) { 1205 res = error("Failed to symlink " + _libsymlink + " to " + nativeLibPath32); 1206 goto out; 1207 } 1208 1209out: 1210 if (chmod(pkgdir, s.st_mode) < 0) { 1211 auto msg = "Failed to cleanup chmod " + _pkgdir; 1212 if (res.isOk()) { 1213 res = error(msg); 1214 } else { 1215 PLOG(ERROR) << msg; 1216 } 1217 } 1218 1219 if (chown(pkgdir, s.st_uid, s.st_gid) < 0) { 1220 auto msg = "Failed to cleanup chown " + _pkgdir; 1221 if (res.isOk()) { 1222 res = error(msg); 1223 } else { 1224 PLOG(ERROR) << msg; 1225 } 1226 } 1227 1228 return res; 1229} 1230 1231static void run_idmap(const char *target_apk, const char *overlay_apk, int idmap_fd) 1232{ 1233 static const char *IDMAP_BIN = "/system/bin/idmap"; 1234 static const size_t MAX_INT_LEN = 32; 1235 char idmap_str[MAX_INT_LEN]; 1236 1237 snprintf(idmap_str, sizeof(idmap_str), "%d", idmap_fd); 1238 1239 execl(IDMAP_BIN, IDMAP_BIN, "--fd", target_apk, overlay_apk, idmap_str, (char*)NULL); 1240 ALOGE("execl(%s) failed: %s\n", IDMAP_BIN, strerror(errno)); 1241} 1242 1243// Transform string /a/b/c.apk to (prefix)/a@b@c.apk@(suffix) 1244// eg /a/b/c.apk to /data/resource-cache/a@b@c.apk@idmap 1245static int flatten_path(const char *prefix, const char *suffix, 1246 const char *overlay_path, char *idmap_path, size_t N) 1247{ 1248 if (overlay_path == NULL || idmap_path == NULL) { 1249 return -1; 1250 } 1251 const size_t len_overlay_path = strlen(overlay_path); 1252 // will access overlay_path + 1 further below; requires absolute path 1253 if (len_overlay_path < 2 || *overlay_path != '/') { 1254 return -1; 1255 } 1256 const size_t len_idmap_root = strlen(prefix); 1257 const size_t len_suffix = strlen(suffix); 1258 if (SIZE_MAX - len_idmap_root < len_overlay_path || 1259 SIZE_MAX - (len_idmap_root + len_overlay_path) < len_suffix) { 1260 // additions below would cause overflow 1261 return -1; 1262 } 1263 if (N < len_idmap_root + len_overlay_path + len_suffix) { 1264 return -1; 1265 } 1266 memset(idmap_path, 0, N); 1267 snprintf(idmap_path, N, "%s%s%s", prefix, overlay_path + 1, suffix); 1268 char *ch = idmap_path + len_idmap_root; 1269 while (*ch != '\0') { 1270 if (*ch == '/') { 1271 *ch = '@'; 1272 } 1273 ++ch; 1274 } 1275 return 0; 1276} 1277 1278binder::Status InstalldNativeService::idmap(const std::string& targetApkPath, 1279 const std::string& overlayApkPath, int32_t uid) { 1280 ENFORCE_UID(AID_SYSTEM); 1281 const char* target_apk = targetApkPath.c_str(); 1282 const char* overlay_apk = overlayApkPath.c_str(); 1283 ALOGV("idmap target_apk=%s overlay_apk=%s uid=%d\n", target_apk, overlay_apk, uid); 1284 1285 int idmap_fd = -1; 1286 char idmap_path[PATH_MAX]; 1287 1288 if (flatten_path(IDMAP_PREFIX, IDMAP_SUFFIX, overlay_apk, 1289 idmap_path, sizeof(idmap_path)) == -1) { 1290 ALOGE("idmap cannot generate idmap path for overlay %s\n", overlay_apk); 1291 goto fail; 1292 } 1293 1294 unlink(idmap_path); 1295 idmap_fd = open(idmap_path, O_RDWR | O_CREAT | O_EXCL, 0644); 1296 if (idmap_fd < 0) { 1297 ALOGE("idmap cannot open '%s' for output: %s\n", idmap_path, strerror(errno)); 1298 goto fail; 1299 } 1300 if (fchown(idmap_fd, AID_SYSTEM, uid) < 0) { 1301 ALOGE("idmap cannot chown '%s'\n", idmap_path); 1302 goto fail; 1303 } 1304 if (fchmod(idmap_fd, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) < 0) { 1305 ALOGE("idmap cannot chmod '%s'\n", idmap_path); 1306 goto fail; 1307 } 1308 1309 pid_t pid; 1310 pid = fork(); 1311 if (pid == 0) { 1312 /* child -- drop privileges before continuing */ 1313 if (setgid(uid) != 0) { 1314 ALOGE("setgid(%d) failed during idmap\n", uid); 1315 exit(1); 1316 } 1317 if (setuid(uid) != 0) { 1318 ALOGE("setuid(%d) failed during idmap\n", uid); 1319 exit(1); 1320 } 1321 if (flock(idmap_fd, LOCK_EX | LOCK_NB) != 0) { 1322 ALOGE("flock(%s) failed during idmap: %s\n", idmap_path, strerror(errno)); 1323 exit(1); 1324 } 1325 1326 run_idmap(target_apk, overlay_apk, idmap_fd); 1327 exit(1); /* only if exec call to idmap failed */ 1328 } else { 1329 int status = wait_child(pid); 1330 if (status != 0) { 1331 ALOGE("idmap failed, status=0x%04x\n", status); 1332 goto fail; 1333 } 1334 } 1335 1336 close(idmap_fd); 1337 return ok(); 1338fail: 1339 if (idmap_fd >= 0) { 1340 close(idmap_fd); 1341 unlink(idmap_path); 1342 } 1343 return error(); 1344} 1345 1346binder::Status InstalldNativeService::restoreconAppData(const std::unique_ptr<std::string>& uuid, 1347 const std::string& packageName, int32_t userId, int32_t flags, int32_t appId, 1348 const std::string& seInfo) { 1349 ENFORCE_UID(AID_SYSTEM); 1350 CHECK_ARGUMENT_UUID(uuid); 1351 CHECK_ARGUMENT_PACKAGE_NAME(packageName); 1352 1353 binder::Status res = ok(); 1354 1355 // SELINUX_ANDROID_RESTORECON_DATADATA flag is set by libselinux. Not needed here. 1356 unsigned int seflags = SELINUX_ANDROID_RESTORECON_RECURSE; 1357 const char* uuid_ = uuid ? uuid->c_str() : nullptr; 1358 const char* pkgName = packageName.c_str(); 1359 const char* seinfo = seInfo.c_str(); 1360 1361 uid_t uid = multiuser_get_uid(userId, appId); 1362 if (flags & FLAG_STORAGE_CE) { 1363 auto path = create_data_user_ce_package_path(uuid_, userId, pkgName); 1364 if (selinux_android_restorecon_pkgdir(path.c_str(), seinfo, uid, seflags) < 0) { 1365 res = error("restorecon failed for " + path); 1366 } 1367 } 1368 if (flags & FLAG_STORAGE_DE) { 1369 auto path = create_data_user_de_package_path(uuid_, userId, pkgName); 1370 if (selinux_android_restorecon_pkgdir(path.c_str(), seinfo, uid, seflags) < 0) { 1371 res = error("restorecon failed for " + path); 1372 } 1373 } 1374 return res; 1375} 1376 1377binder::Status InstalldNativeService::createOatDir(const std::string& oatDir, 1378 const std::string& instructionSet) { 1379 ENFORCE_UID(AID_SYSTEM); 1380 const char* oat_dir = oatDir.c_str(); 1381 const char* instruction_set = instructionSet.c_str(); 1382 char oat_instr_dir[PKG_PATH_MAX]; 1383 1384 if (validate_apk_path(oat_dir)) { 1385 return error("Invalid path " + oatDir); 1386 } 1387 if (fs_prepare_dir(oat_dir, S_IRWXU | S_IRWXG | S_IXOTH, AID_SYSTEM, AID_INSTALL)) { 1388 return error("Failed to prepare " + oatDir); 1389 } 1390 if (selinux_android_restorecon(oat_dir, 0)) { 1391 return error("Failed to restorecon " + oatDir); 1392 } 1393 snprintf(oat_instr_dir, PKG_PATH_MAX, "%s/%s", oat_dir, instruction_set); 1394 if (fs_prepare_dir(oat_instr_dir, S_IRWXU | S_IRWXG | S_IXOTH, AID_SYSTEM, AID_INSTALL)) { 1395 return error(StringPrintf("Failed to prepare %s", oat_instr_dir)); 1396 } 1397 return ok(); 1398} 1399 1400binder::Status InstalldNativeService::rmPackageDir(const std::string& packageDir) { 1401 ENFORCE_UID(AID_SYSTEM); 1402 if (validate_apk_path(packageDir.c_str())) { 1403 return error("Invalid path " + packageDir); 1404 } 1405 if (delete_dir_contents_and_dir(packageDir) != 0) { 1406 return error("Failed to delete " + packageDir); 1407 } 1408 return ok(); 1409} 1410 1411binder::Status InstalldNativeService::linkFile(const std::string& relativePath, 1412 const std::string& fromBase, const std::string& toBase) { 1413 ENFORCE_UID(AID_SYSTEM); 1414 const char* relative_path = relativePath.c_str(); 1415 const char* from_base = fromBase.c_str(); 1416 const char* to_base = toBase.c_str(); 1417 char from_path[PKG_PATH_MAX]; 1418 char to_path[PKG_PATH_MAX]; 1419 snprintf(from_path, PKG_PATH_MAX, "%s/%s", from_base, relative_path); 1420 snprintf(to_path, PKG_PATH_MAX, "%s/%s", to_base, relative_path); 1421 1422 if (validate_apk_path_subdirs(from_path)) { 1423 return error(StringPrintf("Invalid from path %s", from_path)); 1424 } 1425 1426 if (validate_apk_path_subdirs(to_path)) { 1427 return error(StringPrintf("Invalid to path %s", to_path)); 1428 } 1429 1430 if (link(from_path, to_path) < 0) { 1431 return error(StringPrintf("Failed to link from %s to %s", from_path, to_path)); 1432 } 1433 1434 return ok(); 1435} 1436 1437binder::Status InstalldNativeService::moveAb(const std::string& apkPath, 1438 const std::string& instructionSet, const std::string& outputPath) { 1439 ENFORCE_UID(AID_SYSTEM); 1440 1441 const char* apk_path = apkPath.c_str(); 1442 const char* instruction_set = instructionSet.c_str(); 1443 const char* oat_dir = outputPath.c_str(); 1444 1445 bool success = move_ab(apk_path, instruction_set, oat_dir); 1446 return success ? ok() : error(); 1447} 1448 1449binder::Status InstalldNativeService::deleteOdex(const std::string& apkPath, 1450 const std::string& instructionSet, const std::string& outputPath) { 1451 ENFORCE_UID(AID_SYSTEM); 1452 1453 const char* apk_path = apkPath.c_str(); 1454 const char* instruction_set = instructionSet.c_str(); 1455 const char* oat_dir = outputPath.c_str(); 1456 1457 bool res = delete_odex(apk_path, instruction_set, oat_dir); 1458 return res ? ok() : error(); 1459} 1460 1461} // namespace installd 1462} // namespace android 1463