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 mlstrustedsubject; 8typeattribute system_server remote_provisioning_service_server; 9typeattribute system_server scheduler_service_server; 10typeattribute system_server sensor_service_server; 11typeattribute system_server stats_service_server; 12typeattribute system_server bpfdomain; 13 14# Define a type for tmpfs-backed ashmem regions. 15tmpfs_domain(system_server) 16 17userfaultfd_use(system_server) 18 19# Create a socket for connections from crash_dump. 20type_transition system_server system_data_file:sock_file system_ndebug_socket "ndebugsocket"; 21 22# Create a socket for connections from zygotes. 23type_transition system_server system_data_file:sock_file system_unsolzygote_socket "unsolzygotesocket"; 24 25allow system_server zygote_tmpfs:file { map read }; 26allow system_server appdomain_tmpfs:file { getattr map read write }; 27 28# For Incremental Service to check if incfs is available 29allow system_server proc_filesystems:file r_file_perms; 30 31# To create files, get permission to fill blocks, and configure Incremental File System 32allow system_server incremental_control_file:file { ioctl r_file_perms }; 33allowxperm system_server incremental_control_file:file ioctl { 34 INCFS_IOCTL_CREATE_FILE 35 INCFS_IOCTL_CREATE_MAPPED_FILE 36 INCFS_IOCTL_PERMIT_FILL 37 INCFS_IOCTL_GET_READ_TIMEOUTS 38 INCFS_IOCTL_SET_READ_TIMEOUTS 39 INCFS_IOCTL_GET_LAST_READ_ERROR 40}; 41 42# To get signature of an APK installed on Incremental File System, and fill in data 43# blocks and get the filesystem state 44allowxperm system_server apk_data_file:file ioctl { 45 INCFS_IOCTL_READ_SIGNATURE 46 INCFS_IOCTL_FILL_BLOCKS 47 INCFS_IOCTL_GET_FILLED_BLOCKS 48 INCFS_IOCTL_GET_BLOCK_COUNT 49 F2FS_IOC_GET_FEATURES 50 F2FS_IOC_GET_COMPRESS_BLOCKS 51 F2FS_IOC_COMPRESS_FILE 52 F2FS_IOC_DECOMPRESS_FILE 53 F2FS_IOC_RELEASE_COMPRESS_BLOCKS 54 F2FS_IOC_RESERVE_COMPRESS_BLOCKS 55 FS_IOC_SETFLAGS 56 FS_IOC_GETFLAGS 57}; 58 59allowxperm system_server apk_tmp_file:file ioctl { 60 F2FS_IOC_RELEASE_COMPRESS_BLOCKS 61 FS_IOC_GETFLAGS 62}; 63 64# For Incremental Service to check incfs metrics 65allow system_server sysfs_fs_incfs_metrics:file r_file_perms; 66 67# For f2fs-compression support 68allow system_server sysfs_fs_f2fs:dir r_dir_perms; 69allow system_server sysfs_fs_f2fs:file r_file_perms; 70 71# For SdkSandboxManagerService 72allow system_server sdk_sandbox_system_data_file:dir create_dir_perms; 73 74# For art. 75allow system_server { apex_art_data_file dalvikcache_data_file }:dir r_dir_perms; 76allow system_server { apex_art_data_file dalvikcache_data_file }:file r_file_perms; 77 78# Ignore the denial on `system@[email protected]@classes.odex`. 79# `com.android.location.provider.jar` happens to be both a jar on system server classpath and a 80# shared library used by a system server app. The odex file is loaded fine by Zygote when it forks 81# system_server. It fails to be loaded when the jar is used as a shared library, which is expected. 82dontaudit system_server apex_art_data_file:file execute; 83 84# For release odex/vdex compress blocks 85allowxperm system_server dalvikcache_data_file:file ioctl { 86 F2FS_IOC_RELEASE_COMPRESS_BLOCKS 87 FS_IOC_GETFLAGS 88}; 89 90# When running system server under --invoke-with, we'll try to load the boot image under the 91# system server domain, following links to the system partition. 92with_asan(`allow system_server dalvikcache_data_file:lnk_file r_file_perms;') 93 94# /data/resource-cache 95allow system_server resourcecache_data_file:file r_file_perms; 96allow system_server resourcecache_data_file:dir r_dir_perms; 97 98# ptrace to processes in the same domain for debugging crashes. 99allow system_server self:process ptrace; 100 101# Child of the zygote. 102allow system_server zygote:fd use; 103allow system_server zygote:process sigchld; 104 105# May kill zygote (or its child processes) on crashes. 106allow system_server { 107 app_zygote 108 crash_dump 109 crosvm 110 virtualizationmanager 111 webview_zygote 112 zygote 113}:process { getpgid sigkill signull }; 114 115# Read /system/bin/app_process. 116allow system_server zygote_exec:file r_file_perms; 117 118# Needed to close the zygote socket, which involves getopt / getattr 119allow system_server zygote:unix_stream_socket { getopt getattr }; 120 121# system server gets network and bluetooth permissions. 122net_domain(system_server) 123# in addition to ioctls allowlisted for all domains, also allow system_server 124# to use privileged ioctls commands. Needed to set up VPNs. 125allowxperm system_server self:udp_socket ioctl priv_sock_ioctls; 126bluetooth_domain(system_server) 127 128# Allow setup of tcp keepalive offload. This gives system_server the permission to 129# call ioctl on app domains' tcp sockets. Additional ioctl commands still need to 130# be granted individually, except for a small set of safe values allowlisted in 131# public/domain.te. 132allow system_server appdomain:tcp_socket ioctl; 133 134# These are the capabilities assigned by the zygote to the 135# system server. 136allow system_server self:global_capability_class_set { 137 ipc_lock 138 kill 139 net_admin 140 net_bind_service 141 net_broadcast 142 net_raw 143 sys_boot 144 sys_nice 145 sys_ptrace 146 sys_time 147 sys_tty_config 148}; 149 150# Allow alarmtimers to be set 151allow system_server self:global_capability2_class_set wake_alarm; 152 153# Create and share netlink_netfilter_sockets for tetheroffload. 154allow system_server self:netlink_netfilter_socket create_socket_perms_no_ioctl; 155 156# Create/use netlink_tcpdiag_socket for looking up connection UIDs for VPN apps. 157allow system_server self:netlink_tcpdiag_socket 158 { create_socket_perms_no_ioctl nlmsg_read nlmsg_write }; 159 160# Use netlink uevent sockets. 161allow system_server self:netlink_kobject_uevent_socket create_socket_perms_no_ioctl; 162 163allow system_server self:netlink_nflog_socket create_socket_perms_no_ioctl; 164 165# Use generic netlink sockets. 166allow system_server self:netlink_socket create_socket_perms_no_ioctl; 167allow system_server self:netlink_generic_socket create_socket_perms_no_ioctl; 168 169# libvintf reads the kernel config to verify vendor interface compatibility. 170allow system_server config_gz:file { read open }; 171 172# Use generic "sockets" where the address family is not known 173# to the kernel. The ioctl permission is specifically omitted here, but may 174# be added to device specific policy along with the ioctl commands to be 175# allowlisted. 176allow system_server self:socket create_socket_perms_no_ioctl; 177 178# Set and get routes directly via netlink. 179allow system_server self:netlink_route_socket nlmsg_write; 180 181# Use XFRM (IPsec) netlink sockets 182allow system_server self:netlink_xfrm_socket { create_socket_perms_no_ioctl nlmsg_write nlmsg_read }; 183 184# Kill apps. 185allow system_server appdomain:process { getpgid sigkill signal }; 186# signull allowed for kill(pid, 0) existence test. 187allow system_server appdomain:process { signull }; 188 189# Set scheduling info for apps. 190allow system_server appdomain:process { getsched setsched }; 191allow system_server audioserver:process { getsched setsched }; 192allow system_server hal_audio:process { getsched setsched }; 193allow system_server hal_bluetooth:process { getsched setsched }; 194allow system_server hal_codec2_server:process { getsched setsched }; 195allow system_server hal_omx_server:process { getsched setsched }; 196allow system_server mediaswcodec:process { getsched setsched }; 197allow system_server cameraserver:process { getsched setsched }; 198allow system_server hal_camera:process { getsched setsched }; 199allow system_server mediaserver:process { getsched setsched }; 200allow system_server bootanim:process { getsched setsched }; 201 202# Set scheduling info for psi monitor thread. 203# TODO: delete this line b/131761776 204allow system_server kernel:process { getsched setsched }; 205 206# Allow system_server to write to /proc/<pid>/* 207allow system_server domain:file w_file_perms; 208 209# Read /proc/pid data for all domains. This is used by ProcessCpuTracker 210# within system_server to keep track of memory and CPU usage for 211# all processes on the device. In addition, /proc/pid files access is needed 212# for dumping stack traces of native processes. 213r_dir_file(system_server, domain) 214 215# Write /proc/uid_cputime/remove_uid_range. 216allow system_server proc_uid_cputime_removeuid:file { w_file_perms getattr }; 217 218# Write /proc/uid_procstat/set. 219allow system_server proc_uid_procstat_set:file { w_file_perms getattr }; 220 221# Write to /proc/sysrq-trigger. 222allow system_server proc_sysrq:file rw_file_perms; 223 224# Delete /data/misc/stats-service/ directories. 225allow system_server stats_config_data_file:dir { open read remove_name search write }; 226allow system_server stats_config_data_file:file unlink; 227 228# Read metric file & upload to statsd 229allow system_server odsign_data_file:dir search; 230allow system_server odsign_metrics_file:dir { r_dir_perms write remove_name }; 231allow system_server odsign_metrics_file:file { r_file_perms unlink }; 232 233# Read /sys/kernel/debug/wakeup_sources. 234no_debugfs_restriction(` 235 allow system_server debugfs_wakeup_sources:file r_file_perms; 236') 237 238# Read /sys/kernel/ion/*. 239allow system_server sysfs_ion:file r_file_perms; 240 241# Read /sys/kernel/dma_heap/*. 242allow system_server sysfs_dma_heap:file r_file_perms; 243 244# Allow reading DMA-BUF sysfs stats from /sys/kernel/dmabuf. 245allow system_server sysfs_dmabuf_stats:dir r_dir_perms; 246allow system_server sysfs_dmabuf_stats:file r_file_perms; 247 248# Allow ActivityManager to look at the list of DMA-BUF heaps from /dev/dma_heap 249# for dumpsys meminfo 250allow system_server dmabuf_heap_device:dir r_dir_perms; 251 252# Allow reading /proc/vmstat for the oom kill count 253allow system_server proc_vmstat:file r_file_perms; 254 255# The DhcpClient and WifiWatchdog use packet_sockets 256allow system_server self:packet_socket create_socket_perms_no_ioctl; 257 258# 3rd party VPN clients require a tun_socket to be created 259allow system_server self:tun_socket create_socket_perms_no_ioctl; 260 261# Talk to init and various daemons via sockets. 262unix_socket_connect(system_server, lmkd, lmkd) 263unix_socket_connect(system_server, zygote, zygote) 264unix_socket_connect(system_server, uncrypt, uncrypt) 265 266# Allow system_server to write to statsd. 267unix_socket_send(system_server, statsdw, statsd) 268 269# Communicate over a socket created by surfaceflinger. 270allow system_server surfaceflinger:unix_stream_socket { read write setopt }; 271 272allow system_server gpuservice:unix_stream_socket { read write setopt }; 273 274# Communicate over a socket created by webview_zygote. 275allow system_server webview_zygote:unix_stream_socket { read write connectto setopt }; 276 277# Communicate over a socket created by app_zygote. 278allow system_server app_zygote:unix_stream_socket { read write connectto setopt }; 279 280# Perform Binder IPC. 281binder_use(system_server) 282binder_call(system_server, appdomain) 283binder_call(system_server, artd) 284binder_call(system_server, binderservicedomain) 285binder_call(system_server, composd) 286binder_call(system_server, dexopt_chroot_setup) 287binder_call(system_server, dumpstate) 288binder_call(system_server, fingerprintd) 289binder_call(system_server, gatekeeperd) 290binder_call(system_server, gpuservice) 291binder_call(system_server, idmap) 292binder_call(system_server, installd) 293binder_call(system_server, incidentd) 294binder_call(system_server, netd) 295binder_call(system_server, ot_daemon) 296userdebug_or_eng(`binder_call(system_server, profcollectd)') 297binder_call(system_server, statsd) 298binder_call(system_server, storaged) 299binder_call(system_server, update_engine) 300binder_call(system_server, virtual_camera) 301binder_call(system_server, vold) 302binder_call(system_server, logd) 303binder_call(system_server, wificond) 304binder_call(system_server, uprobestats) 305binder_service(system_server) 306 307# Use HALs 308hal_client_domain(system_server, hal_allocator) 309hal_client_domain(system_server, hal_audio) 310hal_client_domain(system_server, hal_authgraph) 311hal_client_domain(system_server, hal_authsecret) 312hal_client_domain(system_server, hal_bluetooth) 313hal_client_domain(system_server, hal_broadcastradio) 314hal_client_domain(system_server, hal_codec2) 315hal_client_domain(system_server, hal_configstore) 316hal_client_domain(system_server, hal_contexthub) 317hal_client_domain(system_server, hal_face) 318hal_client_domain(system_server, hal_fingerprint) 319hal_client_domain(system_server, hal_gnss) 320hal_client_domain(system_server, hal_graphics_allocator) 321hal_client_domain(system_server, hal_health) 322hal_client_domain(system_server, hal_input_classifier) 323hal_client_domain(system_server, hal_input_processor) 324hal_client_domain(system_server, hal_ir) 325hal_client_domain(system_server, hal_keymint) 326hal_client_domain(system_server, hal_light) 327hal_client_domain(system_server, hal_memtrack) 328hal_client_domain(system_server, hal_neuralnetworks) 329hal_client_domain(system_server, hal_oemlock) 330hal_client_domain(system_server, hal_omx) 331hal_client_domain(system_server, hal_power) 332hal_client_domain(system_server, hal_power_stats) 333hal_client_domain(system_server, hal_rebootescrow) 334hal_client_domain(system_server, hal_remotelyprovisionedcomponent_avf) 335hal_client_domain(system_server, hal_sensors) 336hal_client_domain(system_server, hal_tetheroffload) 337hal_client_domain(system_server, hal_thermal) 338hal_client_domain(system_server, hal_threadnetwork) 339hal_client_domain(system_server, hal_tv_cec) 340hal_client_domain(system_server, hal_tv_hdmi_cec) 341hal_client_domain(system_server, hal_tv_hdmi_connection) 342hal_client_domain(system_server, hal_tv_hdmi_earc) 343hal_client_domain(system_server, hal_tv_input) 344hal_client_domain(system_server, hal_usb) 345hal_client_domain(system_server, hal_usb_gadget) 346hal_client_domain(system_server, hal_uwb) 347hal_client_domain(system_server, hal_vibrator) 348hal_client_domain(system_server, hal_vr) 349hal_client_domain(system_server, hal_weaver) 350hal_client_domain(system_server, hal_wifi) 351hal_client_domain(system_server, hal_wifi_hostapd) 352hal_client_domain(system_server, hal_wifi_supplicant) 353# The bootctl is a pass through HAL mode under recovery mode. So we skip the 354# permission for recovery in order not to give system server the access to 355# the low level block devices. 356not_recovery(`hal_client_domain(system_server, hal_bootctl)') 357 358# Talk with graphics composer fences 359allow system_server hal_graphics_composer:fd use; 360 361# Use RenderScript always-passthrough HAL 362allow system_server hal_renderscript_hwservice:hwservice_manager find; 363allow system_server same_process_hal_file:file { execute read open getattr map }; 364 365# Talk to tombstoned to get ANR traces. 366unix_socket_connect(system_server, tombstoned_intercept, tombstoned) 367 368# List HAL interfaces to get ANR traces. 369allow system_server hwservicemanager:hwservice_manager list; 370allow system_server servicemanager:service_manager list; 371 372# Send signals to trigger ANR traces. 373allow system_server { 374 # This is derived from the list that system server defines as interesting native processes 375 # to dump during ANRs or watchdog aborts, defined in NATIVE_STACKS_OF_INTEREST in 376 # frameworks/base/services/core/java/com/android/server/Watchdog.java. 377 artd 378 audioserver 379 cameraserver 380 drmserver 381 gpuservice 382 inputflinger 383 keystore 384 mediadrmserver 385 mediaextractor 386 mediametrics 387 mediaserver 388 mediaswcodec 389 mediatranscoding 390 mediatuner 391 netd 392 sdcardd 393 servicemanager 394 statsd 395 surfaceflinger 396 vold 397 398 # This list comes from HAL_INTERFACES_OF_INTEREST in 399 # frameworks/base/services/core/java/com/android/server/Watchdog.java. 400 hal_audio_server 401 hal_bluetooth_server 402 hal_camera_server 403 hal_codec2_server 404 hal_face_server 405 hal_fingerprint_server 406 hal_gnss_server 407 hal_graphics_allocator_server 408 hal_graphics_composer_server 409 hal_health_server 410 hal_input_processor_server 411 hal_light_server 412 hal_neuralnetworks_server 413 hal_omx_server 414 hal_power_server 415 hal_power_stats_server 416 hal_sensors_server 417 hal_vibrator_server 418 hal_vr_server 419 system_suspend_server 420}:process { signal }; 421 422# Use sockets received over binder from various services. 423allow system_server audioserver:tcp_socket rw_socket_perms; 424allow system_server audioserver:udp_socket rw_socket_perms; 425allow system_server mediaserver:tcp_socket rw_socket_perms; 426allow system_server mediaserver:udp_socket rw_socket_perms; 427 428# Use sockets received over binder from various services. 429allow system_server mediadrmserver:tcp_socket rw_socket_perms; 430allow system_server mediadrmserver:udp_socket rw_socket_perms; 431 432# Write trace data to the Perfetto traced daemon. This requires connecting to 433# its producer socket and obtaining a (per-process) tmpfs fd. 434perfetto_producer(system_server) 435 436# Get file context 437allow system_server file_contexts_file:file r_file_perms; 438# access for mac_permissions 439allow system_server mac_perms_file: file r_file_perms; 440# Check SELinux permissions. 441selinux_check_access(system_server) 442 443allow system_server sysfs_type:dir r_dir_perms; 444 445r_dir_file(system_server, sysfs_android_usb) 446allow system_server sysfs_android_usb:file w_file_perms; 447 448r_dir_file(system_server, sysfs_extcon) 449 450r_dir_file(system_server, sysfs_ipv4) 451allow system_server sysfs_ipv4:file w_file_perms; 452 453r_dir_file(system_server, sysfs_rtc) 454r_dir_file(system_server, sysfs_switch) 455 456allow system_server sysfs_nfc_power_writable:file rw_file_perms; 457allow system_server sysfs_power:dir search; 458allow system_server sysfs_power:file rw_file_perms; 459allow system_server sysfs_thermal:dir search; 460allow system_server sysfs_thermal:file r_file_perms; 461allow system_server sysfs_uhid:dir r_dir_perms; 462allow system_server sysfs_uhid:file rw_file_perms; 463 464# TODO: Remove when HALs are forced into separate processes 465allow system_server sysfs_vibrator:file { write append }; 466 467# TODO: added to match above sysfs rule. Remove me? 468allow system_server sysfs_usb:file w_file_perms; 469 470# Access devices. 471allow system_server device:dir r_dir_perms; 472allow system_server mdns_socket:sock_file rw_file_perms; 473allow system_server gpu_device:chr_file rw_file_perms; 474allow system_server gpu_device:dir r_dir_perms; 475allow system_server sysfs_gpu:file r_file_perms; 476allow system_server input_device:dir r_dir_perms; 477allow system_server input_device:chr_file rw_file_perms; 478allow system_server tty_device:chr_file rw_file_perms; 479allow system_server usbaccessory_device:chr_file rw_file_perms; 480allow system_server video_device:dir r_dir_perms; 481allow system_server video_device:chr_file rw_file_perms; 482allow system_server adbd_socket:sock_file rw_file_perms; 483allow system_server rtc_device:chr_file rw_file_perms; 484allow system_server audio_device:dir r_dir_perms; 485allow system_server uhid_device:chr_file rw_file_perms; 486allow system_server hidraw_device:dir r_dir_perms; 487allow system_server hidraw_device:chr_file rw_file_perms; 488 489# write access to ALSA interfaces (/dev/snd/*) needed for MIDI 490allow system_server audio_device:chr_file rw_file_perms; 491 492# tun device used for 3rd party vpn apps and test network manager 493allow system_server tun_device:chr_file rw_file_perms; 494allowxperm system_server tun_device:chr_file ioctl { TUNGETIFF TUNSETIFF TUNSETLINK TUNSETCARRIER }; 495 496# Manage data/ota_package 497allow system_server ota_package_file:dir rw_dir_perms; 498allow system_server ota_package_file:file create_file_perms; 499 500# Manage system data files. 501allow system_server system_data_file:dir create_dir_perms; 502allow system_server system_data_file:notdevfile_class_set create_file_perms; 503allow system_server packages_list_file:file create_file_perms; 504allow system_server game_mode_intervention_list_file:file create_file_perms; 505allow system_server keychain_data_file:dir create_dir_perms; 506allow system_server keychain_data_file:file create_file_perms; 507allow system_server keychain_data_file:lnk_file create_file_perms; 508 509# Read the user parent directories like /data/user. Don't allow write access, 510# as vold is responsible for creating and deleting the subdirectories. 511allow system_server system_userdir_file:dir r_dir_perms; 512 513# Manage /data/app. 514allow system_server apk_data_file:dir create_dir_perms; 515allow system_server apk_data_file:{ file lnk_file } { create_file_perms link }; 516allow system_server apk_tmp_file:dir create_dir_perms; 517allow system_server apk_tmp_file:file create_file_perms; 518 519# Access input configuration files in the /vendor directory 520r_dir_file(system_server, vendor_keylayout_file) 521r_dir_file(system_server, vendor_keychars_file) 522r_dir_file(system_server, vendor_idc_file) 523get_prop(system_server, input_device_config_prop) 524 525# Access /vendor/{app,framework,overlay} 526r_dir_file(system_server, vendor_app_file) 527r_dir_file(system_server, vendor_framework_file) 528r_dir_file(system_server, vendor_overlay_file) 529 530# Manage /data/app-private. 531allow system_server apk_private_data_file:dir create_dir_perms; 532allow system_server apk_private_data_file:file create_file_perms; 533allow system_server apk_private_tmp_file:dir create_dir_perms; 534allow system_server apk_private_tmp_file:file create_file_perms; 535 536# Manage files within asec containers. 537allow system_server asec_apk_file:dir create_dir_perms; 538allow system_server asec_apk_file:file create_file_perms; 539allow system_server asec_public_file:file create_file_perms; 540 541# Manage /data/anr. 542# 543# TODO: Some of these permissions can be withdrawn once we've switched to the 544# new stack dumping mechanism, see b/32064548 and the rules below. In particular, 545# the system_server should never need to create a new anr_data_file:file or write 546# to one, but it will still need to read and append to existing files. 547allow system_server anr_data_file:dir create_dir_perms; 548allow system_server anr_data_file:file create_file_perms; 549 550# New stack dumping scheme : request an output FD from tombstoned via a unix 551# domain socket. 552# 553# Allow system_server to connect and write to the tombstoned java trace socket in 554# order to dump its traces. Also allow the system server to write its traces to 555# dumpstate during bugreport capture and incidentd during incident collection. 556unix_socket_connect(system_server, tombstoned_java_trace, tombstoned) 557allow system_server tombstoned:fd use; 558allow system_server dumpstate:fifo_file append; 559allow system_server incidentd:fifo_file append; 560# Write to a pipe created from `adb shell` (for debuggerd -j `pidof system_server`) 561userdebug_or_eng(` 562 allow system_server su:fifo_file append; 563') 564 565# Allow system_server to read pipes from incidentd (used to deliver incident reports 566# to dropbox) 567allow system_server incidentd:fifo_file read; 568 569# Read /data/misc/incidents - only read. The fd will be sent over binder, 570# with no DAC access to it, for dropbox to read. 571allow system_server incident_data_file:file read; 572 573# Manage /data/misc/prereboot. 574allow system_server prereboot_data_file:dir rw_dir_perms; 575allow system_server prereboot_data_file:file create_file_perms; 576 577# Allow tracing proxy service to read traces. Only the fd is sent over 578# binder. 579allow system_server perfetto_traces_data_file:file { read getattr }; 580allow system_server perfetto:fd use; 581 582# Allow system_server to exec the perfetto cmdline client and pass it a trace config 583domain_auto_trans(system_server, perfetto_exec, perfetto); 584allow system_server perfetto:fifo_file { read write }; 585 586# Allow system server to manage perfetto traces for ProfilingService. 587allow system_server perfetto_traces_profiling_data_file:dir rw_dir_perms; 588allow system_server perfetto_traces_profiling_data_file:file { rw_file_perms unlink }; 589allow system_server perfetto_traces_data_file:dir search; 590 591# Manage /data/backup. 592allow system_server backup_data_file:dir create_dir_perms; 593allow system_server backup_data_file:file create_file_perms; 594 595# Write to /data/system/dropbox 596allow system_server dropbox_data_file:dir create_dir_perms; 597allow system_server dropbox_data_file:file create_file_perms; 598 599# Write to /data/system/heapdump 600allow system_server heapdump_data_file:dir rw_dir_perms; 601allow system_server heapdump_data_file:file create_file_perms; 602 603# Manage /data/misc/adb. 604allow system_server adb_keys_file:dir create_dir_perms; 605allow system_server adb_keys_file:file create_file_perms; 606 607# Manage /data/misc/appcompat. 608allow system_server appcompat_data_file:dir rw_dir_perms; 609allow system_server appcompat_data_file:file create_file_perms; 610 611# Manage /data/misc/emergencynumberdb 612allow system_server emergency_data_file:dir create_dir_perms; 613allow system_server emergency_data_file:file create_file_perms; 614 615# Manage /data/misc/network_watchlist 616allow system_server network_watchlist_data_file:dir create_dir_perms; 617allow system_server network_watchlist_data_file:file create_file_perms; 618 619# Manage /data/misc/sms. 620# TODO: Split into a separate type? 621allow system_server radio_data_file:dir create_dir_perms; 622allow system_server radio_data_file:file create_file_perms; 623 624# Manage /data/misc/systemkeys. 625allow system_server systemkeys_data_file:dir create_dir_perms; 626allow system_server systemkeys_data_file:file create_file_perms; 627 628# Manage /data/misc/textclassifier. 629allow system_server textclassifier_data_file:dir create_dir_perms; 630allow system_server textclassifier_data_file:file create_file_perms; 631 632# Manage /data/tombstones. 633allow system_server tombstone_data_file:dir rw_dir_perms; 634allow system_server tombstone_data_file:file create_file_perms; 635 636# Manage /data/misc/vpn. 637allow system_server vpn_data_file:dir create_dir_perms; 638allow system_server vpn_data_file:file create_file_perms; 639 640# Manage /data/misc/wifi. 641allow system_server wifi_data_file:dir create_dir_perms; 642allow system_server wifi_data_file:file create_file_perms; 643 644# Manage /data/app-staging. 645allow system_server staging_data_file:dir create_dir_perms; 646allow system_server staging_data_file:file create_file_perms; 647 648# Manage /data/rollback. 649allow system_server staging_data_file:{ file lnk_file } { create_file_perms link }; 650 651# Walk /data/data subdirectories. 652allow system_server app_data_file_type:dir { getattr read search }; 653 654# Also permit for unlabeled /data/data subdirectories and 655# for unlabeled asec containers on upgrades from 4.2. 656allow system_server unlabeled:dir r_dir_perms; 657# Read pkg.apk file before it has been relabeled by vold. 658allow system_server unlabeled:file r_file_perms; 659 660# Populate com.android.providers.settings/databases/settings.db. 661allow system_server system_app_data_file:dir create_dir_perms; 662allow system_server system_app_data_file:file create_file_perms; 663 664# Receive and use open app data files passed over binder IPC. 665allow system_server app_data_file_type:file { getattr read write append map }; 666 667# Access to /data/media for measuring disk usage. 668allow system_server media_rw_data_file:dir { search getattr open read }; 669 670# Receive and use open /data/media files passed over binder IPC. 671# Also used for measuring disk usage. 672allow system_server media_rw_data_file:file { getattr read write append }; 673 674# System server needs to setfscreate to packages_list_file when writing 675# /data/system/packages.list 676allow system_server system_server:process setfscreate; 677 678# Relabel apk files. 679allow system_server { apk_tmp_file apk_private_tmp_file }:{ dir file } { relabelfrom relabelto }; 680allow system_server { apk_data_file apk_private_data_file }:{ dir file } { relabelfrom relabelto }; 681# Allow PackageManager to: 682# 1. rename file from /data/app-staging folder to /data/app 683# 2. relabel files (linked to /data/rollback) under /data/app-staging 684# during staged apk/apex install. 685allow system_server { staging_data_file }:{ dir file } { relabelfrom relabelto }; 686 687# Relabel wallpaper. 688allow system_server system_data_file:file relabelfrom; 689allow system_server wallpaper_file:file relabelto; 690allow system_server wallpaper_file:file { rw_file_perms rename unlink }; 691 692# Backup of wallpaper imagery uses temporary hard links to avoid data churn 693allow system_server { system_data_file wallpaper_file }:file link; 694 695# ShortcutManager icons 696allow system_server system_data_file:dir relabelfrom; 697allow system_server shortcut_manager_icons:dir { create_dir_perms relabelto }; 698allow system_server shortcut_manager_icons:file create_file_perms; 699 700# Manage ringtones. 701allow system_server ringtone_file:dir { create_dir_perms relabelto }; 702allow system_server ringtone_file:file create_file_perms; 703 704# Relabel icon file. 705allow system_server icon_file:file relabelto; 706allow system_server icon_file:file { rw_file_perms unlink }; 707 708# FingerprintService.java does a restorecon of the directory /data/system/users/[0-9]+/fpdata(/.*)? 709allow system_server system_data_file:dir relabelfrom; 710 711# server_configurable_flags_data_file is used for storing server configurable flags which 712# have been reset during current booting. system_server needs to read the data to perform related 713# disaster recovery actions. 714allow system_server server_configurable_flags_data_file:dir r_dir_perms; 715allow system_server server_configurable_flags_data_file:file r_file_perms; 716 717# Property Service write 718set_prop(system_server, system_prop) 719set_prop(system_server, bootanim_system_prop) 720set_prop(system_server, bluetooth_prop) 721set_prop(system_server, exported_system_prop) 722set_prop(system_server, exported3_system_prop) 723set_prop(system_server, safemode_prop) 724set_prop(system_server, theme_prop) 725set_prop(system_server, dhcp_prop) 726set_prop(system_server, net_connectivity_prop) 727set_prop(system_server, net_radio_prop) 728set_prop(system_server, net_dns_prop) 729set_prop(system_server, usb_control_prop) 730set_prop(system_server, usb_prop) 731set_prop(system_server, debug_prop) 732set_prop(system_server, powerctl_prop) 733set_prop(system_server, fingerprint_prop) 734set_prop(system_server, device_logging_prop) 735set_prop(system_server, dumpstate_options_prop) 736set_prop(system_server, overlay_prop) 737set_prop(system_server, exported_overlay_prop) 738set_prop(system_server, pm_prop) 739set_prop(system_server, exported_pm_prop) 740set_prop(system_server, socket_hook_prop) 741set_prop(system_server, audio_prop) 742set_prop(system_server, boot_status_prop) 743set_prop(system_server, surfaceflinger_color_prop) 744set_prop(system_server, provisioned_prop) 745set_prop(system_server, retaildemo_prop) 746set_prop(system_server, dmesgd_start_prop) 747set_prop(system_server, locale_prop) 748set_prop(system_server, timezone_metadata_prop) 749set_prop(system_server, timezone_prop) 750set_prop(system_server, crashrecovery_prop) 751userdebug_or_eng(`set_prop(system_server, wifi_log_prop)') 752userdebug_or_eng(`set_prop(system_server, system_user_mode_emulation_prop)') 753 754# ctl interface 755set_prop(system_server, ctl_default_prop) 756set_prop(system_server, ctl_bugreport_prop) 757set_prop(system_server, ctl_gsid_prop) 758 759# cppreopt property 760set_prop(system_server, cppreopt_prop) 761 762# server configurable flags properties 763set_prop(system_server, device_config_core_experiments_team_internal_prop) 764set_prop(system_server, device_config_edgetpu_native_prop) 765set_prop(system_server, device_config_input_native_boot_prop) 766set_prop(system_server, device_config_netd_native_prop) 767set_prop(system_server, device_config_nnapi_native_prop) 768set_prop(system_server, device_config_activity_manager_native_boot_prop) 769set_prop(system_server, device_config_runtime_native_boot_prop) 770set_prop(system_server, device_config_runtime_native_prop) 771set_prop(system_server, device_config_lmkd_native_prop) 772set_prop(system_server, device_config_media_native_prop) 773set_prop(system_server, device_config_camera_native_prop) 774set_prop(system_server, device_config_mglru_native_prop) 775set_prop(system_server, device_config_profcollect_native_boot_prop) 776set_prop(system_server, device_config_statsd_native_prop) 777set_prop(system_server, device_config_statsd_native_boot_prop) 778set_prop(system_server, device_config_storage_native_boot_prop) 779set_prop(system_server, device_config_swcodec_native_prop) 780set_prop(system_server, device_config_sys_traced_prop) 781set_prop(system_server, device_config_window_manager_native_boot_prop) 782set_prop(system_server, device_config_configuration_prop) 783set_prop(system_server, device_config_connectivity_prop) 784set_prop(system_server, device_config_surface_flinger_native_boot_prop) 785set_prop(system_server, device_config_aconfig_flags_prop) 786set_prop(system_server, device_config_vendor_system_native_prop) 787set_prop(system_server, device_config_vendor_system_native_boot_prop) 788set_prop(system_server, device_config_virtualization_framework_native_prop) 789set_prop(system_server, device_config_memory_safety_native_boot_prop) 790set_prop(system_server, device_config_memory_safety_native_prop) 791set_prop(system_server, device_config_remote_key_provisioning_native_prop) 792set_prop(system_server, device_config_tethering_u_or_later_native_prop) 793set_prop(system_server, smart_idle_maint_enabled_prop) 794set_prop(system_server, arm64_memtag_prop) 795 796# staged flag properties 797set_prop(system_server, next_boot_prop) 798 799# Allow query ART device config properties 800get_prop(system_server, device_config_runtime_native_boot_prop) 801get_prop(system_server, device_config_runtime_native_prop) 802 803# BootReceiver to read ro.boot.bootreason 804get_prop(system_server, bootloader_boot_reason_prop) 805# PowerManager to read sys.boot.reason 806get_prop(system_server, system_boot_reason_prop) 807 808# Collect metrics on boot time created by init 809get_prop(system_server, boottime_prop) 810 811# Read device's serial number from system properties 812get_prop(system_server, serialno_prop) 813 814# Read/write the property which keeps track of whether this is the first start of system_server 815set_prop(system_server, firstboot_prop) 816 817# Audio service in system server can read audio config properties, 818# such as camera shutter enforcement 819get_prop(system_server, audio_config_prop) 820 821# StorageManager service reads media config while checking if transcoding is supported. 822get_prop(system_server, media_config_prop) 823 824# system server reads this property to keep track of whether server configurable flags have been 825# reset during current boot. 826get_prop(system_server, device_config_reset_performed_prop) 827 828# Read/write the property that enables Test Harness Mode 829set_prop(system_server, test_harness_prop) 830 831# Read gsid.image_running. 832get_prop(system_server, gsid_prop) 833 834# Read the property that mocks an OTA 835get_prop(system_server, mock_ota_prop) 836 837# Read the property as feature flag for protecting apks with fs-verity. 838get_prop(system_server, apk_verity_prop) 839 840# Read wifi.interface 841get_prop(system_server, wifi_prop) 842 843# Read the vendor property that indicates if Incremental features is enabled 844get_prop(system_server, incremental_prop) 845 846# Read ro.zram. properties 847get_prop(system_server, zram_config_prop) 848 849# Read/write persist.sys.zram_enabled 850set_prop(system_server, zram_control_prop) 851 852# Read/write persist.sys.dalvik.vm.lib.2 853set_prop(system_server, dalvik_runtime_prop) 854 855# Read ro.control_privapp_permissions and ro.cp_system_other_odex 856get_prop(system_server, packagemanager_config_prop) 857 858# Read the net.464xlat.cellular.enabled property (written by init). 859get_prop(system_server, net_464xlat_fromvendor_prop) 860 861# Read hypervisor capabilities ro.boot.hypervisor.* 862get_prop(system_server, hypervisor_prop) 863 864# Read persist.wm.debug. properties 865get_prop(system_server, persist_wm_debug_prop) 866 867# Read persist.sysui.notification.builder_extras_override property 868get_prop(system_server, persist_sysui_builder_extras_prop) 869# Read persist.sysui.notification.ranking_update_ashmem property 870get_prop(system_server, persist_sysui_ranking_update_prop) 871 872# Read ro.tuner.lazyhal 873get_prop(system_server, tuner_config_prop) 874# Write tuner.server.enable 875set_prop(system_server, tuner_server_ctl_prop) 876 877# Allow the heap dump ART plugin to the count of sessions waiting for OOME 878get_prop(system_server, traced_oome_heap_session_count_prop) 879 880# Allow the sensor service (running in the system service) to read sensor 881# configuration properties 882get_prop(system_server, sensors_config_prop) 883 884# Create a socket for connections from debuggerd. 885allow system_server system_ndebug_socket:sock_file create_file_perms; 886 887# Create a socket for connections from zygotes. 888allow system_server system_unsolzygote_socket:sock_file create_file_perms; 889 890# Manage cache files. 891allow system_server cache_file:lnk_file r_file_perms; 892allow system_server { cache_file cache_recovery_file }:dir { relabelfrom create_dir_perms }; 893allow system_server { cache_file cache_recovery_file }:file { relabelfrom create_file_perms }; 894allow system_server { cache_file cache_recovery_file }:fifo_file create_file_perms; 895 896allow system_server system_file:dir r_dir_perms; 897allow system_server system_file:lnk_file r_file_perms; 898 899# ART locks profile files. 900allow system_server system_file:file lock; 901 902# LocationManager(e.g, GPS) needs to read and write 903# to uart driver and ctrl proc entry 904allow system_server gps_control:file rw_file_perms; 905 906# Allow system_server to use app-created sockets and pipes. 907allow system_server appdomain:{ tcp_socket udp_socket } { getattr getopt setopt read write shutdown }; 908allow system_server appdomain:{ fifo_file unix_stream_socket } { getattr read write }; 909 910# BackupManagerService needs to manipulate backup data files 911allow system_server cache_backup_file:dir rw_dir_perms; 912allow system_server cache_backup_file:file create_file_perms; 913# LocalTransport works inside /cache/backup 914allow system_server cache_private_backup_file:dir create_dir_perms; 915allow system_server cache_private_backup_file:file create_file_perms; 916 917# Allow system to talk to usb device 918allow system_server usb_device:chr_file rw_file_perms; 919allow system_server usb_device:dir r_dir_perms; 920 921# Read and delete files under /dev/fscklogs. 922r_dir_file(system_server, fscklogs) 923allow system_server fscklogs:dir { write remove_name add_name }; 924allow system_server fscklogs:file rename; 925 926# logd access, system_server inherit logd write socket 927# (urge is to deprecate this long term) 928allow system_server zygote:unix_dgram_socket write; 929 930# Read from log daemon. 931read_logd(system_server) 932read_runtime_log_tags(system_server) 933 934# Be consistent with DAC permissions. Allow system_server to write to 935# /sys/module/lowmemorykiller/parameters/adj 936# /sys/module/lowmemorykiller/parameters/minfree 937allow system_server sysfs_lowmemorykiller:file { getattr w_file_perms }; 938 939# Read /sys/fs/pstore/console-ramoops 940# Don't worry about overly broad permissions for now, as there's 941# only one file in /sys/fs/pstore 942allow system_server pstorefs:dir r_dir_perms; 943allow system_server pstorefs:file r_file_perms; 944 945# /sys access 946allow system_server sysfs_zram:dir search; 947allow system_server sysfs_zram:file rw_file_perms; 948 949# Read /sys/fs/selinux/policy 950allow system_server kernel:security read_policy; 951 952add_service(system_server, system_server_service); 953allow system_server artd_service:service_manager find; 954allow system_server artd_pre_reboot_service:service_manager find; 955allow system_server audioserver_service:service_manager find; 956allow system_server authorization_service:service_manager find; 957allow system_server batteryproperties_service:service_manager find; 958allow system_server cameraserver_service:service_manager find; 959allow system_server compos_service:service_manager find; 960allow system_server dataloader_manager_service:service_manager find; 961allow system_server dexopt_chroot_setup_service:service_manager find; 962allow system_server dnsresolver_service:service_manager find; 963allow system_server drmserver_service:service_manager find; 964allow system_server dumpstate_service:service_manager find; 965allow system_server fingerprintd_service:service_manager find; 966allow system_server gatekeeper_service:service_manager find; 967allow system_server gpu_service:service_manager find; 968allow system_server gsi_service:service_manager find; 969allow system_server idmap_service:service_manager find; 970allow system_server incident_service:service_manager find; 971allow system_server incremental_service:service_manager find; 972allow system_server installd_service:service_manager find; 973allow system_server keystore_maintenance_service:service_manager find; 974allow system_server keystore_metrics_service:service_manager find; 975allow system_server keystore_service:service_manager find; 976allow system_server mdns_service:service_manager find; 977allow system_server mediaserver_service:service_manager find; 978allow system_server mediametrics_service:service_manager find; 979allow system_server mediaextractor_service:service_manager find; 980allow system_server mediadrmserver_service:service_manager find; 981allow system_server mediatuner_service:service_manager find; 982allow system_server netd_service:service_manager find; 983allow system_server nfc_service:service_manager find; 984allow system_server ot_daemon_service:service_manager find; 985allow system_server radio_service:service_manager find; 986allow system_server stats_service:service_manager find; 987allow system_server storaged_service:service_manager find; 988allow system_server surfaceflinger_service:service_manager find; 989allow system_server update_engine_service:service_manager find; 990allow system_server virtual_camera_service:service_manager find; 991is_flag_enabled(RELEASE_AVF_ENABLE_LLPVM_CHANGES, ` 992 allow system_server virtualization_maintenance_service:service_manager find; 993') 994allow system_server vold_service:service_manager find; 995allow system_server wifinl80211_service:service_manager find; 996allow system_server logd_service:service_manager find; 997userdebug_or_eng(` 998 allow system_server profcollectd_service:service_manager find; 999') 1000 1001add_service(system_server, batteryproperties_service) 1002 1003allow system_server keystore:keystore2 { 1004 add_auth 1005 change_password 1006 change_user 1007 clear_ns 1008 clear_uid 1009 get_last_auth_time 1010 lock 1011 pull_metrics 1012 reset 1013 unlock 1014}; 1015 1016allow system_server keystore:keystore2_key { 1017 delete 1018 use_dev_id 1019 grant 1020 get_info 1021 rebind 1022 update 1023 use 1024}; 1025 1026# Allow Wifi module to manage Wi-Fi keys. 1027allow system_server wifi_key:keystore2_key { 1028 delete 1029 get_info 1030 rebind 1031 update 1032 use 1033}; 1034 1035# Allow lock_settings service to manage RoR keys. 1036allow system_server resume_on_reboot_key:keystore2_key { 1037 delete 1038 get_info 1039 rebind 1040 update 1041 use 1042}; 1043 1044# Allow lock_settings service to manage locksettings keys (e.g. the synthetic password key). 1045allow system_server locksettings_key:keystore2_key { 1046 delete 1047 get_info 1048 rebind 1049 update 1050 use 1051}; 1052 1053 1054# Allow system server to search and write to the persistent factory reset 1055# protection partition. This block device does not get wiped in a factory reset. 1056allow system_server block_device:dir search; 1057allow system_server frp_block_device:blk_file rw_file_perms; 1058allowxperm system_server frp_block_device:blk_file ioctl { BLKSECDISCARD BLKDISCARD }; 1059 1060# Create new process groups and clean up old cgroups 1061allow system_server cgroup:dir create_dir_perms; 1062allow system_server cgroup:file setattr; 1063allow system_server cgroup_v2:dir create_dir_perms; 1064allow system_server cgroup_v2:file { r_file_perms setattr }; 1065 1066# /oem access 1067r_dir_file(system_server, oemfs) 1068 1069# Allow resolving per-user storage symlinks 1070allow system_server { mnt_user_file storage_file }:dir { getattr search }; 1071allow system_server { mnt_user_file storage_file }:lnk_file { getattr read }; 1072 1073# Allow statfs() on storage devices, which happens fast enough that 1074# we shouldn't be killed during unsafe removal 1075allow system_server { sdcard_type fuse }:dir { getattr search }; 1076 1077# Traverse into expanded storage 1078allow system_server mnt_expand_file:dir r_dir_perms; 1079 1080# Allow system process to relabel the fingerprint directory after mkdir 1081# and delete the directory and files when no longer needed 1082allow system_server fingerprintd_data_file:dir { r_dir_perms remove_name rmdir relabelto write }; 1083allow system_server fingerprintd_data_file:file { getattr unlink }; 1084 1085userdebug_or_eng(` 1086 # Allow system server to create and write method traces in /data/misc/trace. 1087 allow system_server method_trace_data_file:dir w_dir_perms; 1088 allow system_server method_trace_data_file:file { create w_file_perms }; 1089 1090 # Allow system server to read dmesg 1091 allow system_server kernel:system syslog_read; 1092 1093 # Allow writing and removing window traces in /data/misc/wmtrace. 1094 allow system_server wm_trace_data_file:dir rw_dir_perms; 1095 allow system_server wm_trace_data_file:file { getattr setattr create unlink w_file_perms }; 1096 1097 # Allow writing and removing accessibility traces in /data/misc/a11ytrace. 1098 allow system_server accessibility_trace_data_file:dir rw_dir_perms; 1099 allow system_server accessibility_trace_data_file:file { getattr setattr create unlink w_file_perms }; 1100') 1101 1102# For AppFuse. 1103allow system_server vold:fd use; 1104allow system_server fuse_device:chr_file { read write ioctl getattr }; 1105allow system_server app_fuse_file:file { read write getattr }; 1106 1107# For configuring sdcardfs 1108allow system_server configfs:dir { create_dir_perms }; 1109allow system_server configfs:file { getattr open create unlink write }; 1110 1111# Connect to adbd and use a socket transferred from it. 1112# Used for e.g. jdwp. 1113allow system_server adbd:unix_stream_socket connectto; 1114allow system_server adbd:fd use; 1115allow system_server adbd:unix_stream_socket { getattr getopt ioctl read write shutdown }; 1116 1117# Read service.adb.tls.port, persist.adb.wifi. properties 1118get_prop(system_server, adbd_prop) 1119 1120# Set persist.adb.tls_server.enable property 1121set_prop(system_server, system_adbd_prop) 1122 1123# Allow invoking tools like "timeout" 1124allow system_server toolbox_exec:file rx_file_perms; 1125 1126# Allow system process to setup fs-verity 1127allowxperm system_server { apk_data_file apk_tmp_file system_data_file apex_system_server_data_file }:file ioctl FS_IOC_ENABLE_VERITY; 1128 1129# Allow system process to measure fs-verity for apps, including those being installed 1130allowxperm system_server { apk_data_file apk_tmp_file }:file ioctl FS_IOC_MEASURE_VERITY; 1131allowxperm system_server apk_tmp_file:file ioctl FS_IOC_SETFLAGS; 1132 1133# Postinstall 1134# 1135# For OTA dexopt, allow calls coming from postinstall. 1136binder_call(system_server, postinstall) 1137 1138allow system_server postinstall:fifo_file write; 1139allow system_server update_engine:fd use; 1140allow system_server update_engine:fifo_file write; 1141 1142# Access to /data/preloads 1143allow system_server preloads_data_file:file { r_file_perms unlink }; 1144allow system_server preloads_data_file:dir { r_dir_perms write remove_name rmdir }; 1145allow system_server preloads_media_file:file { r_file_perms unlink }; 1146allow system_server preloads_media_file:dir { r_dir_perms write remove_name rmdir }; 1147 1148r_dir_file(system_server, cgroup) 1149r_dir_file(system_server, cgroup_v2) 1150allow system_server ion_device:chr_file r_file_perms; 1151 1152# Access to /dev/dma_heap/system 1153allow system_server dmabuf_system_heap_device:chr_file r_file_perms; 1154# Access to /dev/dma_heap/system-secure 1155allow system_server dmabuf_system_secure_heap_device:chr_file r_file_perms; 1156 1157r_dir_file(system_server, proc_asound) 1158r_dir_file(system_server, proc_net_type) 1159r_dir_file(system_server, proc_qtaguid_stat) 1160allow system_server { 1161 proc_cmdline 1162 proc_loadavg 1163 proc_locks 1164 proc_meminfo 1165 proc_pagetypeinfo 1166 proc_pipe_conf 1167 proc_stat 1168 proc_uid_cputime_showstat 1169 proc_uid_io_stats 1170 proc_uid_time_in_state 1171 proc_uid_concurrent_active_time 1172 proc_uid_concurrent_policy_time 1173 proc_version 1174 proc_vmallocinfo 1175}:file r_file_perms; 1176 1177allow system_server proc_uid_time_in_state:dir r_dir_perms; 1178allow system_server proc_uid_cpupower:file r_file_perms; 1179 1180r_dir_file(system_server, rootfs) 1181 1182# Allow WifiService to start, stop, and read wifi-specific trace events. 1183allow system_server debugfs_tracing_instances:dir search; 1184allow system_server debugfs_wifi_tracing:dir search; 1185allow system_server debugfs_wifi_tracing:file rw_file_perms; 1186 1187# Allow BootReceiver to watch trace error_report events. 1188allow system_server debugfs_bootreceiver_tracing:dir search; 1189allow system_server debugfs_bootreceiver_tracing:file r_file_perms; 1190 1191# Allow system_server to read tracepoint ids in order to attach BPF programs to them. 1192allow system_server debugfs_tracing:file r_file_perms; 1193 1194# allow system_server to exec shell, asanwrapper & zygote(app_process) on ASAN builds. Needed to run 1195# asanwrapper. 1196with_asan(` 1197 allow system_server shell_exec:file rx_file_perms; 1198 allow system_server asanwrapper_exec:file rx_file_perms; 1199 allow system_server zygote_exec:file rx_file_perms; 1200') 1201 1202# allow system_server to read the eBPF maps that stores the traffic stats information and update 1203# the map after snapshot is recorded, and to read, update and run the maps and programs used for 1204# time in state accounting 1205allow system_server { fs_bpf fs_bpf_net_shared fs_bpf_netd_readonly fs_bpf_netd_shared }:dir search; 1206allow system_server { fs_bpf fs_bpf_net_shared fs_bpf_netd_readonly fs_bpf_netd_shared }:file { getattr read write }; 1207allow system_server bpfloader:bpf { map_read map_write prog_run }; 1208# in order to invoke side effect of close() on such a socket calling synchronize_rcu() 1209allow system_server self:key_socket create; 1210# Java's Os.close() in libcore/luni/src/main/java/libcore/io/BlockGuardOs.java;l=100 1211# calls if (fd.isSocket$()) if (isLingerSocket(fd)) ... 1212dontaudit system_server self:key_socket getopt; 1213 1214# Allow system_server to start clatd in its own domain and kill it. 1215domain_auto_trans(system_server, clatd_exec, clatd) 1216allow system_server clatd:process { sigkill signal }; 1217 1218# ART Profiles. 1219# Allow system_server to open profile snapshots for read. 1220# System server never reads the actual content. It passes the descriptor to 1221# to privileged apps which acquire the permissions to inspect the profiles. 1222allow system_server { user_profile_root_file user_profile_data_file}:dir { getattr search }; 1223allow system_server user_profile_data_file:file { getattr open read }; 1224 1225# System server may dump profile data for debuggable apps in the /data/misc/profman. 1226# As such it needs to be able create files but it should never read from them. 1227# It also needs to stat the directory to check if it has the right permissions. 1228allow system_server profman_dump_data_file:file { create getattr setattr w_file_perms}; 1229allow system_server profman_dump_data_file:dir rw_dir_perms; 1230 1231# On userdebug build we may profile system server. Allow it to write and create its own profile. 1232userdebug_or_eng(` 1233 allow system_server user_profile_data_file:dir w_dir_perms; 1234 allow system_server user_profile_data_file:file create_file_perms; 1235') 1236# Allow system server to load JVMTI agents under control of a property. 1237get_prop(system_server,system_jvmti_agent_prop) 1238 1239# UsbDeviceManager uses /dev/usb-ffs 1240allow system_server functionfs:dir search; 1241allow system_server functionfs:file rw_file_perms; 1242 1243# system_server contains time / time zone detection logic so reads the associated properties. 1244get_prop(system_server, time_prop) 1245 1246# system_server reads this property to know it should expect the lmkd sends notification to it 1247# on low memory kills. 1248get_prop(system_server, system_lmk_prop) 1249 1250get_prop(system_server, wifi_config_prop) 1251 1252# Only system server can access BINDER_FREEZE and BINDER_GET_FROZEN_INFO 1253allowxperm system_server binder_device:chr_file ioctl { BINDER_FREEZE BINDER_GET_FROZEN_INFO }; 1254 1255# Watchdog prints debugging log to /dev/kmsg_debug. 1256userdebug_or_eng(` 1257 allow system_server kmsg_debug_device:chr_file { open append getattr }; 1258') 1259# Watchdog reads sysprops framework_watchdog.fatal_* to handle watchdog timeout loop. 1260get_prop(system_server, framework_watchdog_config_prop) 1261 1262 1263# Font files are written by system server 1264allow system_server font_data_file:file create_file_perms; 1265allow system_server font_data_file:dir create_dir_perms; 1266# Allow system process to setup and measure fs-verity for font files 1267allowxperm system_server font_data_file:file ioctl { FS_IOC_ENABLE_VERITY FS_IOC_MEASURE_VERITY }; 1268 1269# Read qemu.hw.mainkeys property 1270get_prop(system_server, qemu_hw_prop) 1271 1272# Allow system server to read profcollectd reports for upload. 1273userdebug_or_eng(`r_dir_file(system_server, profcollectd_data_file)') 1274 1275### 1276### Neverallow rules 1277### 1278### system_server should NEVER do any of this 1279 1280# Do not allow opening files from external storage as unsafe ejection 1281# could cause the kernel to kill the system_server. 1282neverallow system_server { sdcard_type fuse }:dir { open read write }; 1283neverallow system_server { sdcard_type fuse }:file rw_file_perms; 1284 1285# system server should never be operating on zygote spawned app data 1286# files directly. Rather, they should always be passed via a 1287# file descriptor. 1288# Exclude those types that system_server needs to open directly. 1289neverallow system_server { 1290 app_data_file_type 1291 -system_app_data_file 1292 -radio_data_file 1293}:file { open create unlink link }; 1294 1295# Forking and execing is inherently dangerous and racy. See, for 1296# example, https://www.linuxprogrammingblog.com/threads-and-fork-think-twice-before-using-them 1297# Prevent the addition of new file execs to stop the problem from 1298# getting worse. b/28035297 1299neverallow system_server { 1300 file_type 1301 -toolbox_exec 1302 -logcat_exec 1303 with_asan(`-shell_exec -asanwrapper_exec -zygote_exec') 1304}:file execute_no_trans; 1305 1306# Ensure that system_server doesn't perform any domain transitions other than 1307# transitioning to the crash_dump domain when a crash occurs or fork clatd. 1308neverallow system_server { domain -clatd -crash_dump -perfetto }:process transition; 1309neverallow system_server *:process dyntransition; 1310 1311# Ensure that system_server doesn't access anything but search in perfetto_traces_data_file:dir. 1312neverallow system_server perfetto_traces_data_file:dir ~search; 1313 1314# Only allow crash_dump to connect to system_ndebug_socket. 1315neverallow { domain -init -system_server -crash_dump } system_ndebug_socket:sock_file { open write }; 1316 1317# Only allow zygotes to connect to system_unsolzygote_socket. 1318neverallow { 1319 domain 1320 -init 1321 -system_server 1322 -zygote 1323 -app_zygote 1324 -webview_zygote 1325} system_unsolzygote_socket:sock_file { open write }; 1326 1327# Only allow init, system_server, flags_health_check to set properties for server configurable flags 1328neverallow { 1329 domain 1330 -init 1331 -system_server 1332 -flags_health_check 1333} { 1334 device_config_core_experiments_team_internal_prop 1335 device_config_activity_manager_native_boot_prop 1336 device_config_connectivity_prop 1337 device_config_input_native_boot_prop 1338 device_config_lmkd_native_prop 1339 device_config_netd_native_prop 1340 device_config_nnapi_native_prop 1341 device_config_edgetpu_native_prop 1342 device_config_runtime_native_boot_prop 1343 device_config_runtime_native_prop 1344 device_config_media_native_prop 1345 device_config_mglru_native_prop 1346 device_config_remote_key_provisioning_native_prop 1347 device_config_storage_native_boot_prop 1348 device_config_surface_flinger_native_boot_prop 1349 device_config_sys_traced_prop 1350 device_config_swcodec_native_prop 1351 device_config_aconfig_flags_prop 1352 device_config_window_manager_native_boot_prop 1353 device_config_tethering_u_or_later_native_prop 1354 next_boot_prop 1355}:property_service set; 1356 1357# Only allow system_server and init to set tuner_server_ctl_prop 1358neverallow { 1359 domain 1360 -system_server 1361 -init 1362} tuner_server_ctl_prop:property_service set; 1363 1364# system_server should never be executing dex2oat. This is either 1365# a bug (for example, bug 16317188), or represents an attempt by 1366# system server to dynamically load a dex file, something we do not 1367# want to allow. 1368neverallow system_server dex2oat_exec:file no_x_file_perms; 1369 1370# system_server should never execute or load executable shared libraries 1371# in /data. Executable files in /data are a persistence vector. 1372# https://bugs.chromium.org/p/project-zero/issues/detail?id=955 for example. 1373neverallow system_server data_file_type:file no_x_file_perms; 1374 1375# The only block device system_server should be writing to is 1376# the frp_block_device. This helps avoid a system_server to root 1377# escalation by writing to raw block devices. 1378# The system_server may need to read from vd_device if it uses 1379# block apexes. 1380neverallow system_server { dev_type -frp_block_device }:blk_file no_w_file_perms; 1381neverallow system_server { dev_type -frp_block_device -vd_device }:blk_file r_file_perms; 1382 1383# system_server should never use JIT functionality 1384# See https://googleprojectzero.blogspot.com/2016/12/bitunmap-attacking-android-ashmem.html 1385# in the section titled "A Short ROP Chain" for why. 1386# However, in emulator builds without OpenGL passthrough, we use software 1387# rendering via SwiftShader, which requires JIT support. These builds are 1388# never shipped to users. 1389ifelse(target_requires_insecure_execmem_for_swiftshader, `true', 1390 `allow system_server self:process execmem;', 1391 `neverallow system_server self:process execmem;') 1392neverallow system_server { ashmem_device ashmem_libcutils_device }:chr_file execute; 1393 1394# TODO: deal with tmpfs_domain pub/priv split properly 1395neverallow system_server system_server_tmpfs:file execute; 1396 1397# Resources handed off by system_server_startup 1398allow system_server system_server_startup:fd use; 1399allow system_server system_server_startup_tmpfs:file { read write map }; 1400allow system_server system_server_startup:unix_dgram_socket write; 1401 1402# Allow system server to communicate to apexd 1403allow system_server apex_service:service_manager find; 1404allow system_server apexd:binder call; 1405 1406# Allow system server to scan /apex for flattened APEXes 1407allow system_server apex_mnt_dir:dir r_dir_perms; 1408 1409# Allow system server to read /apex/apex-info-list.xml 1410allow system_server apex_info_file:file r_file_perms; 1411 1412# Allow system server to communicate to system-suspend's control interface 1413allow system_server system_suspend_control_internal_service:service_manager find; 1414allow system_server system_suspend_control_service:service_manager find; 1415binder_call(system_server, system_suspend) 1416binder_call(system_suspend, system_server) 1417 1418# Allow system server to communicate to system-suspend's wakelock interface 1419wakelock_use(system_server) 1420 1421# Allow the system server to read files under /data/apex. The system_server 1422# needs these privileges to compare file signatures while processing installs. 1423# 1424# Only apexd is allowed to create new entries or write to any file under /data/apex. 1425allow system_server apex_data_file:dir { getattr search }; 1426allow system_server apex_data_file:file r_file_perms; 1427 1428# Allow the system server to read files under /vendor/apex. This is where 1429# vendor APEX packages might be installed and system_server needs to parse 1430# these packages to inspect the signatures and other metadata. 1431allow system_server vendor_apex_file:dir { getattr search }; 1432allow system_server vendor_apex_file:file r_file_perms; 1433 1434# Allow the system server to manage relevant apex module data files. 1435allow system_server apex_module_data_file:dir { getattr search }; 1436# These are modules where the code runs in system_server, so we need full access. 1437allow system_server apex_system_server_data_file:dir create_dir_perms; 1438allow system_server apex_system_server_data_file:file create_file_perms; 1439allow system_server apex_tethering_data_file:dir create_dir_perms; 1440allow system_server apex_tethering_data_file:file create_file_perms; 1441# Legacy labels that we still need to support (b/217581286) 1442allow system_server { 1443 apex_appsearch_data_file 1444 apex_permission_data_file 1445 apex_scheduling_data_file 1446 apex_wifi_data_file 1447}:dir create_dir_perms; 1448allow system_server { 1449 apex_appsearch_data_file 1450 apex_permission_data_file 1451 apex_scheduling_data_file 1452 apex_wifi_data_file 1453}:file create_file_perms; 1454 1455# Allow PasswordSlotManager rw access to /metadata/password_slots, so GSIs and the host image can 1456# communicate which slots are available for use. 1457allow system_server metadata_file:dir search; 1458allow system_server password_slot_metadata_file:dir rw_dir_perms; 1459allow system_server password_slot_metadata_file:file create_file_perms; 1460 1461allow system_server userspace_reboot_metadata_file:dir create_dir_perms; 1462allow system_server userspace_reboot_metadata_file:file create_file_perms; 1463 1464# Allow system server rw access to files in /metadata/staged-install folder 1465allow system_server staged_install_file:dir rw_dir_perms; 1466allow system_server staged_install_file:file create_file_perms; 1467 1468allow system_server watchdog_metadata_file:dir rw_dir_perms; 1469allow system_server watchdog_metadata_file:file create_file_perms; 1470 1471allow system_server aconfig_storage_flags_metadata_file:dir rw_dir_perms; 1472allow system_server aconfig_storage_flags_metadata_file:file create_file_perms; 1473 1474allow system_server repair_mode_metadata_file:dir rw_dir_perms; 1475allow system_server repair_mode_metadata_file:file create_file_perms; 1476 1477allow system_server gsi_persistent_data_file:dir rw_dir_perms; 1478allow system_server gsi_persistent_data_file:file create_file_perms; 1479 1480# Allow system server read and remove files under /data/misc/odrefresh 1481allow system_server odrefresh_data_file:dir rw_dir_perms; 1482allow system_server odrefresh_data_file:file { r_file_perms unlink }; 1483 1484# Allow system server r access to /system/bin/surfaceflinger for PinnerService. 1485allow system_server surfaceflinger_exec:file r_file_perms; 1486 1487# Allow init to set sysprop used to compute stats about userspace reboot. 1488set_prop(system_server, userspace_reboot_log_prop) 1489 1490# JVMTI agent settings are only readable from the system server. 1491neverallow { 1492 domain 1493 -system_server 1494 -dumpstate 1495 -init 1496 -vendor_init 1497} { 1498 system_jvmti_agent_prop 1499}:file no_rw_file_perms; 1500 1501# Read/Write /proc/pressure/memory 1502allow system_server proc_pressure_mem:file rw_file_perms; 1503# Read /proc/pressure/cpu and /proc/pressure/io 1504allow system_server { proc_pressure_cpu proc_pressure_io }:file r_file_perms; 1505 1506# dexoptanalyzer is currently used only for secondary dex files which 1507# system_server should never access. 1508neverallow system_server dexoptanalyzer_exec:file no_x_file_perms; 1509 1510# No ptracing others 1511neverallow system_server { domain -system_server }:process ptrace; 1512 1513# CAP_SYS_RESOURCE was traditionally needed for sensitive /proc/PID 1514# file read access. However, that is now unnecessary (b/34951864) 1515neverallow system_server system_server:global_capability_class_set sys_resource; 1516 1517# Only system_server/init should access /metadata/password_slots. 1518neverallow { domain -init -system_server } password_slot_metadata_file:dir *; 1519neverallow { 1520 domain 1521 -init 1522 -system_server 1523} password_slot_metadata_file:notdevfile_class_set ~{ relabelto getattr }; 1524neverallow { domain -init -system_server } password_slot_metadata_file:notdevfile_class_set *; 1525 1526# Only system_server/init should access /metadata/userspacereboot. 1527neverallow { domain -init -system_server } userspace_reboot_metadata_file:dir *; 1528neverallow { domain -init -system_server } userspace_reboot_metadata_file:file no_rw_file_perms; 1529 1530# Only system server should access /metadata/aconfig 1531neverallow { domain -init -system_server -aconfigd } aconfig_storage_flags_metadata_file:dir *; 1532neverallow { domain -init -system_server -aconfigd } aconfig_storage_flags_metadata_file:file no_rw_file_perms; 1533 1534# Allow systemserver to read/write the invalidation property 1535set_prop(system_server, binder_cache_system_server_prop) 1536neverallow { domain -system_server -init } 1537 binder_cache_system_server_prop:property_service set; 1538 1539# Allow system server to attach BPF programs to tracepoints. Deny read permission so that 1540# system_server cannot use this access to read perf event data like process stacks. 1541allow system_server self:perf_event { open write cpu kernel }; 1542neverallow system_server self:perf_event ~{ open write cpu kernel }; 1543 1544# Allow writing files under /data/system/shutdown-checkpoints/ 1545allow system_server shutdown_checkpoints_system_data_file:dir create_dir_perms; 1546allow system_server shutdown_checkpoints_system_data_file:file create_file_perms; 1547 1548# Do not allow any domain other than init or system server to set the property 1549neverallow { domain -init -system_server } socket_hook_prop:property_service set; 1550 1551neverallow { domain -init -system_server } boot_status_prop:property_service set; 1552 1553neverallow { 1554 domain 1555 -init 1556 -vendor_init 1557 -dumpstate 1558 -system_server 1559} wifi_config_prop:file no_rw_file_perms; 1560 1561# Only allow system server to write uhid sysfs files 1562neverallow { 1563 domain 1564 -init 1565 -system_server 1566 -ueventd 1567 -vendor_init 1568} sysfs_uhid:file no_w_file_perms; 1569 1570# BINDER_FREEZE is used to block ipc transactions to frozen processes, so it 1571# can be accessed by system_server only (b/143717177) 1572# BINDER_GET_FROZEN_INFO is used by system_server to determine the state of a frozen binder 1573# interface 1574neverallowxperm { domain -system_server } binder_device:chr_file ioctl { BINDER_FREEZE BINDER_GET_FROZEN_INFO }; 1575 1576# Only system server can write the font files. 1577neverallow { domain -init -system_server } font_data_file:file no_w_file_perms; 1578neverallow { domain -init -system_server } font_data_file:dir no_w_dir_perms; 1579 1580# Allow reading /system/etc/font_fallback.xml 1581allow system_server system_font_fallback_file:file r_file_perms; 1582 1583# Allow system server to set dynamic ART properties. 1584set_prop(system_server, dalvik_dynamic_config_prop) 1585 1586# Allow system server to read binderfs 1587allow system_server binderfs_logs:dir r_dir_perms; 1588allow system_server binderfs_logs_stats:file r_file_perms; 1589 1590# Allow GameManagerService to read and write persist.graphics.game_default_frame_rate.enabled 1591set_prop(system_server, game_manager_config_prop) 1592 1593# ThreadNetworkService reads Thread Network properties 1594get_prop(system_server, threadnetwork_config_prop) 1595 1596# Do not allow any domain other than init and system server to set the property 1597neverallow { 1598 domain 1599 -init 1600 -vendor_init 1601 -dumpstate 1602 -system_server 1603} threadnetwork_config_prop:file no_rw_file_perms; 1604 1605# Allow system server to read pm.archiving.enabled prop 1606# TODO(azilio): Remove system property after archiving testing is completed. 1607get_prop(system_server, pm_archiving_enabled_prop) 1608 1609# Do not allow any domain other than init or system server to get or set the property 1610neverallow { domain -init -system_server } crashrecovery_prop:property_service set; 1611neverallow { domain -init -dumpstate -system_server } crashrecovery_prop:file no_rw_file_perms; 1612