1# 2# System Server aka system_server spawned by zygote. 3# Most of the framework services run in this process. 4# 5 6typeattribute system_server coredomain; 7typeattribute system_server domain_deprecated; 8typeattribute system_server mlstrustedsubject; 9 10# Define a type for tmpfs-backed ashmem regions. 11tmpfs_domain(system_server) 12 13# Create a socket for connections from crash_dump. 14type_transition system_server system_data_file:sock_file system_ndebug_socket "ndebugsocket"; 15 16allow system_server zygote_tmpfs:file read; 17 18# For art. 19allow system_server dalvikcache_data_file:dir r_dir_perms; 20allow system_server dalvikcache_data_file:file r_file_perms; 21 22# When running system server under --invoke-with, we'll try to load the boot image under the 23# system server domain, following links to the system partition. 24with_asan(`allow system_server dalvikcache_data_file:lnk_file r_file_perms;') 25 26# /data/resource-cache 27allow system_server resourcecache_data_file:file r_file_perms; 28allow system_server resourcecache_data_file:dir r_dir_perms; 29 30# ptrace to processes in the same domain for debugging crashes. 31allow system_server self:process ptrace; 32 33# Read and delete last_reboot_reason file 34allow system_server reboot_data_file:file { rename r_file_perms unlink }; 35allow system_server reboot_data_file:dir { write search open remove_name }; 36 37# Child of the zygote. 38allow system_server zygote:fd use; 39allow system_server zygote:process sigchld; 40 41# May kill zygote on crashes. 42allow system_server zygote:process sigkill; 43allow system_server crash_dump:process sigkill; 44 45# Read /system/bin/app_process. 46allow system_server zygote_exec:file r_file_perms; 47 48# Needed to close the zygote socket, which involves getopt / getattr 49allow system_server zygote:unix_stream_socket { getopt getattr }; 50 51# system server gets network and bluetooth permissions. 52net_domain(system_server) 53# in addition to ioctls allowlisted for all domains, also allow system_server 54# to use privileged ioctls commands. Needed to set up VPNs. 55allowxperm system_server self:udp_socket ioctl priv_sock_ioctls; 56bluetooth_domain(system_server) 57 58# These are the capabilities assigned by the zygote to the 59# system server. 60allow system_server self:capability { 61 ipc_lock 62 kill 63 net_admin 64 net_bind_service 65 net_broadcast 66 net_raw 67 sys_boot 68 sys_nice 69 sys_ptrace 70 sys_time 71 sys_tty_config 72}; 73 74wakelock_use(system_server) 75 76# Trigger module auto-load. 77allow system_server kernel:system module_request; 78 79# Allow alarmtimers to be set 80allow system_server self:capability2 wake_alarm; 81 82# Create and share netlink_netfilter_sockets for tetheroffload. 83allow system_server self:netlink_netfilter_socket create_socket_perms_no_ioctl; 84 85# Use netlink uevent sockets. 86allow system_server self:netlink_kobject_uevent_socket create_socket_perms_no_ioctl; 87 88# Use generic netlink sockets. 89allow system_server self:netlink_socket create_socket_perms_no_ioctl; 90allow system_server self:netlink_generic_socket create_socket_perms_no_ioctl; 91 92# libvintf reads the kernel config to verify vendor interface compatibility. 93allow system_server config_gz:file { read open }; 94 95# Use generic "sockets" where the address family is not known 96# to the kernel. The ioctl permission is specifically omitted here, but may 97# be added to device specific policy along with the ioctl commands to be 98# allowlisted. 99allow system_server self:socket create_socket_perms_no_ioctl; 100 101# Set and get routes directly via netlink. 102allow system_server self:netlink_route_socket nlmsg_write; 103 104# Kill apps. 105allow system_server appdomain:process { getpgid sigkill signal }; 106 107# Set scheduling info for apps. 108allow system_server appdomain:process { getsched setsched }; 109allow system_server audioserver:process { getsched setsched }; 110allow system_server hal_audio:process { getsched setsched }; 111allow system_server hal_bluetooth:process { getsched setsched }; 112allow system_server cameraserver:process { getsched setsched }; 113allow system_server hal_camera:process { getsched setsched }; 114allow system_server mediaserver:process { getsched setsched }; 115allow system_server bootanim:process { getsched setsched }; 116 117# Allow system_server to write to cameraserver's /proc/<pid>/timerslack_ns 118allow system_server cameraserver:file w_file_perms; 119 120# Read /proc/pid data for all domains. This is used by ProcessCpuTracker 121# within system_server to keep track of memory and CPU usage for 122# all processes on the device. In addition, /proc/pid files access is needed 123# for dumping stack traces of native processes. 124r_dir_file(system_server, domain) 125 126# Read/Write to /proc/net/xt_qtaguid/ctrl and and /dev/xt_qtaguid. 127allow system_server qtaguid_proc:file rw_file_perms; 128allow system_server qtaguid_device:chr_file rw_file_perms; 129 130# Read /proc/uid_cputime/show_uid_stat. 131allow system_server proc_uid_cputime_showstat:file r_file_perms; 132 133# Write /proc/uid_cputime/remove_uid_range. 134allow system_server proc_uid_cputime_removeuid:file { w_file_perms getattr }; 135 136# Write /proc/uid_procstat/set. 137allow system_server proc_uid_procstat_set:file { w_file_perms getattr }; 138 139# Read /proc/uid_time_in_state. 140allow system_server proc_uid_time_in_state:file r_file_perms; 141 142# Write to /proc/sysrq-trigger. 143allow system_server proc_sysrq:file rw_file_perms; 144 145# Read /proc/stat for CPU usage statistics 146allow system_server proc_stat:file r_file_perms; 147 148# Read /sys/kernel/debug/wakeup_sources. 149allow system_server debugfs:file r_file_perms; 150 151# The DhcpClient and WifiWatchdog use packet_sockets 152allow system_server self:packet_socket create_socket_perms_no_ioctl; 153 154# NetworkDiagnostics requires explicit bind() calls to ping sockets. These aren't actually the same 155# as raw sockets, but the kernel doesn't yet distinguish between the two. 156allow system_server node:rawip_socket node_bind; 157 158# 3rd party VPN clients require a tun_socket to be created 159allow system_server self:tun_socket create_socket_perms_no_ioctl; 160 161# Talk to init and various daemons via sockets. 162unix_socket_connect(system_server, lmkd, lmkd) 163unix_socket_connect(system_server, mtpd, mtp) 164unix_socket_connect(system_server, netd, netd) 165unix_socket_connect(system_server, vold, vold) 166unix_socket_connect(system_server, webview_zygote, webview_zygote) 167unix_socket_connect(system_server, zygote, zygote) 168unix_socket_connect(system_server, racoon, racoon) 169unix_socket_connect(system_server, uncrypt, uncrypt) 170 171# Communicate over a socket created by surfaceflinger. 172allow system_server surfaceflinger:unix_stream_socket { read write setopt }; 173 174# Perform Binder IPC. 175binder_use(system_server) 176binder_call(system_server, appdomain) 177binder_call(system_server, binderservicedomain) 178binder_call(system_server, dumpstate) 179binder_call(system_server, fingerprintd) 180binder_call(system_server, gatekeeperd) 181binder_call(system_server, installd) 182binder_call(system_server, incidentd) 183binder_call(system_server, netd) 184binder_call(system_server, wificond) 185binder_service(system_server) 186 187# Use HALs 188hal_client_domain(system_server, hal_allocator) 189hal_client_domain(system_server, hal_broadcastradio) 190hal_client_domain(system_server, hal_configstore) 191hal_client_domain(system_server, hal_contexthub) 192hal_client_domain(system_server, hal_fingerprint) 193hal_client_domain(system_server, hal_gnss) 194hal_client_domain(system_server, hal_graphics_allocator) 195hal_client_domain(system_server, hal_ir) 196hal_client_domain(system_server, hal_light) 197hal_client_domain(system_server, hal_memtrack) 198hal_client_domain(system_server, hal_neuralnetworks) 199hal_client_domain(system_server, hal_oemlock) 200allow system_server hal_omx_hwservice:hwservice_manager find; 201allow system_server hidl_token_hwservice:hwservice_manager find; 202hal_client_domain(system_server, hal_power) 203hal_client_domain(system_server, hal_sensors) 204hal_client_domain(system_server, hal_tetheroffload) 205hal_client_domain(system_server, hal_thermal) 206hal_client_domain(system_server, hal_tv_cec) 207hal_client_domain(system_server, hal_tv_input) 208hal_client_domain(system_server, hal_usb) 209hal_client_domain(system_server, hal_vibrator) 210hal_client_domain(system_server, hal_vr) 211hal_client_domain(system_server, hal_weaver) 212hal_client_domain(system_server, hal_wifi) 213hal_client_domain(system_server, hal_wifi_offload) 214hal_client_domain(system_server, hal_wifi_supplicant) 215 216binder_call(system_server, mediacodec) 217 218# Talk with graphics composer fences 219allow system_server hal_graphics_composer:fd use; 220 221# Use RenderScript always-passthrough HAL 222allow system_server hal_renderscript_hwservice:hwservice_manager find; 223 224# Offer HwBinder services 225add_hwservice(system_server, fwk_scheduler_hwservice) 226add_hwservice(system_server, fwk_sensor_hwservice) 227 228# Talk to tombstoned to get ANR traces. 229unix_socket_connect(system_server, tombstoned_intercept, tombstoned) 230 231# List HAL interfaces to get ANR traces. 232allow system_server hwservicemanager:hwservice_manager list; 233 234# Send signals to trigger ANR traces. 235allow system_server { 236 # This is derived from the list that system server defines as interesting native processes 237 # to dump during ANRs or watchdog aborts, defined in NATIVE_STACKS_OF_INTEREST in 238 # frameworks/base/services/core/java/com/android/server/Watchdog.java. 239 audioserver 240 cameraserver 241 drmserver 242 inputflinger 243 mediadrmserver 244 mediaextractor 245 mediaserver 246 mediametrics 247 sdcardd 248 surfaceflinger 249 250 # This list comes from HAL_INTERFACES_OF_INTEREST in 251 # frameworks/base/services/core/java/com/android/server/Watchdog.java. 252 hal_audio_server 253 hal_bluetooth_server 254 hal_camera_server 255 hal_graphics_composer_server 256 hal_sensors_server 257 hal_vr_server 258 mediacodec # TODO(b/36375899): hal_omx_server 259}:process { signal }; 260 261# Use sockets received over binder from various services. 262allow system_server audioserver:tcp_socket rw_socket_perms; 263allow system_server audioserver:udp_socket rw_socket_perms; 264allow system_server mediaserver:tcp_socket rw_socket_perms; 265allow system_server mediaserver:udp_socket rw_socket_perms; 266 267# Use sockets received over binder from various services. 268allow system_server mediadrmserver:tcp_socket rw_socket_perms; 269allow system_server mediadrmserver:udp_socket rw_socket_perms; 270 271# Get file context 272allow system_server file_contexts_file:file r_file_perms; 273# access for mac_permissions 274allow system_server mac_perms_file: file r_file_perms; 275# Check SELinux permissions. 276selinux_check_access(system_server) 277 278# XXX Label sysfs files with a specific type? 279allow system_server sysfs:file rw_file_perms; 280allow system_server sysfs_nfc_power_writable:file rw_file_perms; 281allow system_server sysfs_devices_system_cpu:file w_file_perms; 282allow system_server sysfs_mac_address:file r_file_perms; 283allow system_server sysfs_thermal:dir search; 284allow system_server sysfs_thermal:file r_file_perms; 285 286# TODO: Remove when HALs are forced into separate processes 287allow system_server sysfs_vibrator:file { write append }; 288 289# TODO: added to match above sysfs rule. Remove me? 290allow system_server sysfs_usb:file w_file_perms; 291 292# Access devices. 293allow system_server device:dir r_dir_perms; 294allow system_server mdns_socket:sock_file rw_file_perms; 295allow system_server alarm_device:chr_file rw_file_perms; 296allow system_server gpu_device:chr_file rw_file_perms; 297allow system_server iio_device:chr_file rw_file_perms; 298allow system_server input_device:dir r_dir_perms; 299allow system_server input_device:chr_file rw_file_perms; 300allow system_server radio_device:chr_file r_file_perms; 301allow system_server tty_device:chr_file rw_file_perms; 302allow system_server usbaccessory_device:chr_file rw_file_perms; 303allow system_server video_device:dir r_dir_perms; 304allow system_server video_device:chr_file rw_file_perms; 305allow system_server adbd_socket:sock_file rw_file_perms; 306allow system_server rtc_device:chr_file rw_file_perms; 307allow system_server audio_device:dir r_dir_perms; 308 309# write access needed for MIDI 310allow system_server audio_device:chr_file rw_file_perms; 311 312# tun device used for 3rd party vpn apps 313allow system_server tun_device:chr_file rw_file_perms; 314 315# Manage system data files. 316allow system_server system_data_file:dir create_dir_perms; 317allow system_server system_data_file:notdevfile_class_set create_file_perms; 318allow system_server keychain_data_file:dir create_dir_perms; 319allow system_server keychain_data_file:file create_file_perms; 320allow system_server keychain_data_file:lnk_file create_file_perms; 321 322# Manage /data/app. 323allow system_server apk_data_file:dir create_dir_perms; 324allow system_server apk_data_file:{ file lnk_file } { create_file_perms link }; 325allow system_server apk_tmp_file:dir create_dir_perms; 326allow system_server apk_tmp_file:file create_file_perms; 327 328# Access /vendor/app 329r_dir_file(system_server, vendor_app_file) 330 331# Access /vendor/app 332r_dir_file(system_server, vendor_overlay_file) 333 334# Manage /data/app-private. 335allow system_server apk_private_data_file:dir create_dir_perms; 336allow system_server apk_private_data_file:file create_file_perms; 337allow system_server apk_private_tmp_file:dir create_dir_perms; 338allow system_server apk_private_tmp_file:file create_file_perms; 339 340# Manage files within asec containers. 341allow system_server asec_apk_file:dir create_dir_perms; 342allow system_server asec_apk_file:file create_file_perms; 343allow system_server asec_public_file:file create_file_perms; 344 345# Manage /data/anr. 346# 347# TODO: Some of these permissions can be withdrawn once we've switched to the 348# new stack dumping mechanism, see b/32064548 and the rules below. In particular, 349# the system_server should never need to create a new anr_data_file:file or write 350# to one, but it will still need to read and append to existing files. 351allow system_server anr_data_file:dir create_dir_perms; 352allow system_server anr_data_file:file create_file_perms; 353 354# New stack dumping scheme : request an output FD from tombstoned via a unix 355# domain socket. 356# 357# Allow system_server to connect and write to the tombstoned java trace socket in 358# order to dump its traces. Also allow the system server to write its traces to 359# dumpstate during bugreport capture. 360unix_socket_connect(system_server, tombstoned_java_trace, tombstoned) 361allow system_server tombstoned:fd use; 362allow system_server dumpstate:fifo_file append; 363 364# Read /data/misc/incidents - only read. The fd will be sent over binder, 365# with no DAC access to it, for dropbox to read. 366allow system_server incident_data_file:file read; 367 368# Manage /data/backup. 369allow system_server backup_data_file:dir create_dir_perms; 370allow system_server backup_data_file:file create_file_perms; 371 372# Write to /data/system/heapdump 373allow system_server heapdump_data_file:dir rw_dir_perms; 374allow system_server heapdump_data_file:file create_file_perms; 375 376# Manage /data/misc/adb. 377allow system_server adb_keys_file:dir create_dir_perms; 378allow system_server adb_keys_file:file create_file_perms; 379 380# Manage /data/misc/sms. 381# TODO: Split into a separate type? 382allow system_server radio_data_file:dir create_dir_perms; 383allow system_server radio_data_file:file create_file_perms; 384 385# Manage /data/misc/systemkeys. 386allow system_server systemkeys_data_file:dir create_dir_perms; 387allow system_server systemkeys_data_file:file create_file_perms; 388 389# Manage /data/misc/textclassifier. 390allow system_server textclassifier_data_file:dir create_dir_perms; 391allow system_server textclassifier_data_file:file create_file_perms; 392 393# Access /data/tombstones. 394allow system_server tombstone_data_file:dir r_dir_perms; 395allow system_server tombstone_data_file:file r_file_perms; 396 397# Manage /data/misc/vpn. 398allow system_server vpn_data_file:dir create_dir_perms; 399allow system_server vpn_data_file:file create_file_perms; 400 401# Manage /data/misc/wifi. 402allow system_server wifi_data_file:dir create_dir_perms; 403allow system_server wifi_data_file:file create_file_perms; 404 405# Manage /data/misc/zoneinfo. 406allow system_server zoneinfo_data_file:dir create_dir_perms; 407allow system_server zoneinfo_data_file:file create_file_perms; 408 409# Walk /data/data subdirectories. 410# Types extracted from seapp_contexts type= fields. 411allow system_server { system_app_data_file bluetooth_data_file nfc_data_file radio_data_file shell_data_file app_data_file }:dir { getattr read search }; 412# Also permit for unlabeled /data/data subdirectories and 413# for unlabeled asec containers on upgrades from 4.2. 414allow system_server unlabeled:dir r_dir_perms; 415# Read pkg.apk file before it has been relabeled by vold. 416allow system_server unlabeled:file r_file_perms; 417 418# Populate com.android.providers.settings/databases/settings.db. 419allow system_server system_app_data_file:dir create_dir_perms; 420allow system_server system_app_data_file:file create_file_perms; 421 422# Receive and use open app data files passed over binder IPC. 423# Types extracted from seapp_contexts type= fields. 424allow system_server { system_app_data_file bluetooth_data_file nfc_data_file radio_data_file shell_data_file app_data_file }:file { getattr read write append }; 425 426# Access to /data/media for measuring disk usage. 427allow system_server media_rw_data_file:dir { search getattr open read }; 428 429# Receive and use open /data/media files passed over binder IPC. 430# Also used for measuring disk usage. 431allow system_server media_rw_data_file:file { getattr read write append }; 432 433# Relabel apk files. 434allow system_server { apk_tmp_file apk_private_tmp_file }:{ dir file } { relabelfrom relabelto }; 435allow system_server { apk_data_file apk_private_data_file }:{ dir file } { relabelfrom relabelto }; 436 437# Relabel wallpaper. 438allow system_server system_data_file:file relabelfrom; 439allow system_server wallpaper_file:file relabelto; 440allow system_server wallpaper_file:file { rw_file_perms rename unlink }; 441 442# Backup of wallpaper imagery uses temporary hard links to avoid data churn 443allow system_server { system_data_file wallpaper_file }:file link; 444 445# ShortcutManager icons 446allow system_server system_data_file:dir relabelfrom; 447allow system_server shortcut_manager_icons:dir { create_dir_perms relabelto }; 448allow system_server shortcut_manager_icons:file create_file_perms; 449 450# Manage ringtones. 451allow system_server ringtone_file:dir { create_dir_perms relabelto }; 452allow system_server ringtone_file:file create_file_perms; 453 454# Relabel icon file. 455allow system_server icon_file:file relabelto; 456allow system_server icon_file:file { rw_file_perms unlink }; 457 458# FingerprintService.java does a restorecon of the directory /data/system/users/[0-9]+/fpdata(/.*)? 459allow system_server system_data_file:dir relabelfrom; 460 461# Property Service write 462set_prop(system_server, system_prop) 463set_prop(system_server, safemode_prop) 464set_prop(system_server, dhcp_prop) 465set_prop(system_server, net_radio_prop) 466set_prop(system_server, net_dns_prop) 467set_prop(system_server, system_radio_prop) 468set_prop(system_server, debug_prop) 469set_prop(system_server, powerctl_prop) 470set_prop(system_server, fingerprint_prop) 471set_prop(system_server, device_logging_prop) 472set_prop(system_server, dumpstate_options_prop) 473set_prop(system_server, overlay_prop) 474userdebug_or_eng(`set_prop(system_server, wifi_log_prop)') 475 476# ctl interface 477set_prop(system_server, ctl_default_prop) 478set_prop(system_server, ctl_bugreport_prop) 479 480# cppreopt property 481set_prop(system_server, cppreopt_prop) 482 483# Collect metrics on boot time created by init 484get_prop(system_server, boottime_prop) 485 486# Read device's serial number from system properties 487get_prop(system_server, serialno_prop) 488 489# Read/write the property which keeps track of whether this is the first start of system_server 490set_prop(system_server, firstboot_prop) 491 492# Create a socket for connections from debuggerd. 493allow system_server system_ndebug_socket:sock_file create_file_perms; 494 495# Manage cache files. 496allow system_server cache_file:lnk_file r_file_perms; 497allow system_server { cache_file cache_recovery_file }:dir { relabelfrom create_dir_perms }; 498allow system_server { cache_file cache_recovery_file }:file { relabelfrom create_file_perms }; 499allow system_server { cache_file cache_recovery_file }:fifo_file create_file_perms; 500 501allow system_server system_file:dir r_dir_perms; 502allow system_server system_file:lnk_file r_file_perms; 503 504# LocationManager(e.g, GPS) needs to read and write 505# to uart driver and ctrl proc entry 506allow system_server gps_control:file rw_file_perms; 507 508# Allow system_server to use app-created sockets and pipes. 509allow system_server appdomain:{ tcp_socket udp_socket } { getattr getopt setopt read write shutdown }; 510allow system_server appdomain:{ fifo_file unix_stream_socket } { getattr read write }; 511 512# BackupManagerService needs to manipulate backup data files 513allow system_server cache_backup_file:dir rw_dir_perms; 514allow system_server cache_backup_file:file create_file_perms; 515# LocalTransport works inside /cache/backup 516allow system_server cache_private_backup_file:dir create_dir_perms; 517allow system_server cache_private_backup_file:file create_file_perms; 518 519# Allow system to talk to usb device 520allow system_server usb_device:chr_file rw_file_perms; 521allow system_server usb_device:dir r_dir_perms; 522 523# Read from HW RNG (needed by EntropyMixer). 524allow system_server hw_random_device:chr_file r_file_perms; 525 526# Read and delete files under /dev/fscklogs. 527r_dir_file(system_server, fscklogs) 528allow system_server fscklogs:dir { write remove_name }; 529allow system_server fscklogs:file unlink; 530 531# logd access, system_server inherit logd write socket 532# (urge is to deprecate this long term) 533allow system_server zygote:unix_dgram_socket write; 534 535# Read from log daemon. 536read_logd(system_server) 537read_runtime_log_tags(system_server) 538 539# Be consistent with DAC permissions. Allow system_server to write to 540# /sys/module/lowmemorykiller/parameters/adj 541# /sys/module/lowmemorykiller/parameters/minfree 542allow system_server sysfs_lowmemorykiller:file { getattr w_file_perms }; 543 544# Read /sys/fs/pstore/console-ramoops 545# Don't worry about overly broad permissions for now, as there's 546# only one file in /sys/fs/pstore 547allow system_server pstorefs:dir r_dir_perms; 548allow system_server pstorefs:file r_file_perms; 549 550# /sys access 551allow system_server sysfs_zram:dir search; 552allow system_server sysfs_zram:file r_file_perms; 553 554add_service(system_server, system_server_service); 555allow system_server audioserver_service:service_manager find; 556allow system_server batteryproperties_service:service_manager find; 557allow system_server cameraserver_service:service_manager find; 558allow system_server drmserver_service:service_manager find; 559allow system_server dumpstate_service:service_manager find; 560allow system_server fingerprintd_service:service_manager find; 561allow system_server hal_fingerprint_service:service_manager find; 562allow system_server gatekeeper_service:service_manager find; 563allow system_server incident_service:service_manager find; 564allow system_server installd_service:service_manager find; 565allow system_server keystore_service:service_manager find; 566allow system_server mediaserver_service:service_manager find; 567allow system_server mediametrics_service:service_manager find; 568allow system_server mediaextractor_service:service_manager find; 569allow system_server mediacodec_service:service_manager find; 570allow system_server mediadrmserver_service:service_manager find; 571allow system_server netd_service:service_manager find; 572allow system_server nfc_service:service_manager find; 573allow system_server radio_service:service_manager find; 574allow system_server surfaceflinger_service:service_manager find; 575allow system_server wificond_service:service_manager find; 576 577allow system_server keystore:keystore_key { 578 get_state 579 get 580 insert 581 delete 582 exist 583 list 584 reset 585 password 586 lock 587 unlock 588 is_empty 589 sign 590 verify 591 grant 592 duplicate 593 clear_uid 594 add_auth 595 user_changed 596}; 597 598# Allow system server to search and write to the persistent factory reset 599# protection partition. This block device does not get wiped in a factory reset. 600allow system_server block_device:dir search; 601allow system_server frp_block_device:blk_file rw_file_perms; 602 603# Clean up old cgroups 604allow system_server cgroup:dir { remove_name rmdir }; 605 606# /oem access 607r_dir_file(system_server, oemfs) 608 609# Allow resolving per-user storage symlinks 610allow system_server { mnt_user_file storage_file }:dir { getattr search }; 611allow system_server { mnt_user_file storage_file }:lnk_file { getattr read }; 612 613# Allow statfs() on storage devices, which happens fast enough that 614# we shouldn't be killed during unsafe removal 615allow system_server sdcard_type:dir { getattr search }; 616 617# Traverse into expanded storage 618allow system_server mnt_expand_file:dir r_dir_perms; 619 620# Allow system process to relabel the fingerprint directory after mkdir 621# and delete the directory and files when no longer needed 622allow system_server fingerprintd_data_file:dir { r_dir_perms remove_name rmdir relabelto write }; 623allow system_server fingerprintd_data_file:file { getattr unlink }; 624 625# Allow system process to read network MAC address 626allow system_server sysfs_mac_address:file r_file_perms; 627 628userdebug_or_eng(` 629 # Allow system server to create and write method traces in /data/misc/trace. 630 allow system_server method_trace_data_file:dir w_dir_perms; 631 allow system_server method_trace_data_file:file { create w_file_perms }; 632 633 # Allow system server to read dmesg 634 allow system_server kernel:system syslog_read; 635') 636 637# For AppFuse. 638allow system_server vold:fd use; 639allow system_server fuse_device:chr_file { read write ioctl getattr }; 640allow system_server app_fuse_file:dir rw_dir_perms; 641allow system_server app_fuse_file:file { read write open getattr append }; 642 643# For configuring sdcardfs 644allow system_server configfs:dir { create_dir_perms }; 645allow system_server configfs:file { getattr open unlink write }; 646 647# Connect to adbd and use a socket transferred from it. 648# Used for e.g. jdwp. 649allow system_server adbd:unix_stream_socket connectto; 650allow system_server adbd:fd use; 651allow system_server adbd:unix_stream_socket { getattr getopt ioctl read write shutdown }; 652 653# Allow invoking tools like "timeout" 654allow system_server toolbox_exec:file rx_file_perms; 655 656# Postinstall 657# 658# For OTA dexopt, allow calls coming from postinstall. 659binder_call(system_server, postinstall) 660 661allow system_server postinstall:fifo_file write; 662allow system_server update_engine:fd use; 663allow system_server update_engine:fifo_file write; 664 665# Access to /data/preloads 666allow system_server preloads_data_file:file { r_file_perms unlink }; 667allow system_server preloads_data_file:dir { r_dir_perms write remove_name rmdir }; 668allow system_server preloads_media_file:file { r_file_perms unlink }; 669allow system_server preloads_media_file:dir { r_dir_perms write remove_name rmdir }; 670 671r_dir_file(system_server, cgroup) 672allow system_server ion_device:chr_file r_file_perms; 673 674r_dir_file(system_server, proc) 675r_dir_file(system_server, proc_meminfo) 676r_dir_file(system_server, proc_net) 677r_dir_file(system_server, rootfs) 678r_dir_file(system_server, sysfs_type) 679 680### Rules needed when Light HAL runs inside system_server process. 681### These rules should eventually be granted only when needed. 682allow system_server sysfs_leds:lnk_file read; 683allow system_server sysfs_leds:file rw_file_perms; 684allow system_server sysfs_leds:dir r_dir_perms; 685### 686 687# Allow WifiService to start, stop, and read wifi-specific trace events. 688allow system_server debugfs_tracing_instances:dir search; 689allow system_server debugfs_wifi_tracing:dir search; 690allow system_server debugfs_wifi_tracing:file rw_file_perms; 691 692# allow system_server to exec shell, asanwrapper & zygote(app_process) on ASAN builds. Needed to run 693# asanwrapper. 694with_asan(` 695 allow system_server shell_exec:file rx_file_perms; 696 allow system_server asanwrapper_exec:file rx_file_perms; 697 allow system_server zygote_exec:file rx_file_perms; 698') 699 700### 701### Neverallow rules 702### 703### system_server should NEVER do any of this 704 705# Do not allow opening files from external storage as unsafe ejection 706# could cause the kernel to kill the system_server. 707neverallow system_server sdcard_type:dir { open read write }; 708neverallow system_server sdcard_type:file rw_file_perms; 709 710# system server should never be operating on zygote spawned app data 711# files directly. Rather, they should always be passed via a 712# file descriptor. 713# Types extracted from seapp_contexts type= fields, excluding 714# those types that system_server needs to open directly. 715neverallow system_server { bluetooth_data_file nfc_data_file shell_data_file app_data_file }:file { open create unlink link }; 716 717# Forking and execing is inherently dangerous and racy. See, for 718# example, https://www.linuxprogrammingblog.com/threads-and-fork-think-twice-before-using-them 719# Prevent the addition of new file execs to stop the problem from 720# getting worse. b/28035297 721neverallow system_server { 722 file_type 723 -toolbox_exec 724 -logcat_exec 725 with_asan(`-shell_exec -asanwrapper_exec -zygote_exec') 726}:file execute_no_trans; 727 728# Ensure that system_server doesn't perform any domain transitions other than 729# transitioning to the crash_dump domain when a crash occurs. 730neverallow system_server { domain -crash_dump }:process transition; 731neverallow system_server *:process dyntransition; 732 733# Only allow crash_dump to connect to system_ndebug_socket. 734neverallow { domain -init -system_server -crash_dump } system_ndebug_socket:sock_file { open write }; 735 736# system_server should never be executing dex2oat. This is either 737# a bug (for example, bug 16317188), or represents an attempt by 738# system server to dynamically load a dex file, something we do not 739# want to allow. 740neverallow system_server dex2oat_exec:file no_x_file_perms; 741 742# system_server should never execute or load executable shared libraries 743# in /data except for /data/dalvik-cache files. 744neverallow system_server { 745 data_file_type 746 -dalvikcache_data_file #mapping with PROT_EXEC 747}:file no_x_file_perms; 748 749# The only block device system_server should be accessing is 750# the frp_block_device. This helps avoid a system_server to root 751# escalation by writing to raw block devices. 752neverallow system_server { dev_type -frp_block_device }:blk_file no_rw_file_perms; 753 754# system_server should never use JIT functionality 755neverallow system_server self:process execmem; 756neverallow system_server ashmem_device:chr_file execute; 757 758# TODO: deal with tmpfs_domain pub/priv split properly 759neverallow system_server system_server_tmpfs:file execute; 760 761# dexoptanalyzer is currently used only for secondary dex files which 762# system_server should never access. 763neverallow system_server dexoptanalyzer_exec:file no_x_file_perms; 764 765# No ptracing others 766neverallow system_server { domain -system_server }:process ptrace; 767 768# CAP_SYS_RESOURCE was traditionally needed for sensitive /proc/PID 769# file read access. However, that is now unnecessary (b/34951864) 770# This neverallow can be removed after b/34951864 is fixed. 771neverallow system_server system_server:capability sys_resource; 772