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# Set scheduling info for VMs (b/375058190) 202allow system_server { virtualizationmanager crosvm }:process { getsched setsched }; 203 204# Set scheduling info for psi monitor thread. 205# TODO: delete this line b/131761776 206allow system_server kernel:process { getsched setsched }; 207 208# Allow system_server to write to /proc/<pid>/* 209allow system_server domain:file w_file_perms; 210 211# Read /proc/pid data for all domains. This is used by ProcessCpuTracker 212# within system_server to keep track of memory and CPU usage for 213# all processes on the device. In addition, /proc/pid files access is needed 214# for dumping stack traces of native processes. 215r_dir_file(system_server, domain) 216 217# Write /proc/uid_cputime/remove_uid_range. 218allow system_server proc_uid_cputime_removeuid:file { w_file_perms getattr }; 219 220# Write /proc/uid_procstat/set. 221allow system_server proc_uid_procstat_set:file { w_file_perms getattr }; 222 223# Write to /proc/sysrq-trigger. 224allow system_server proc_sysrq:file rw_file_perms; 225 226# Delete /data/misc/stats-service/ directories. 227allow system_server stats_config_data_file:dir { open read remove_name search write }; 228allow system_server stats_config_data_file:file unlink; 229 230# Read metric file & upload to statsd 231allow system_server odsign_data_file:dir search; 232allow system_server odsign_metrics_file:dir { r_dir_perms write remove_name }; 233allow system_server odsign_metrics_file:file { r_file_perms unlink }; 234 235# Read /sys/kernel/debug/wakeup_sources. 236no_debugfs_restriction(` 237 allow system_server debugfs_wakeup_sources:file r_file_perms; 238') 239 240# Read /sys/kernel/ion/*. 241allow system_server sysfs_ion:file r_file_perms; 242 243# Read /sys/kernel/dma_heap/*. 244allow system_server sysfs_dma_heap:file r_file_perms; 245 246# Allow reading DMA-BUF sysfs stats from /sys/kernel/dmabuf. 247allow system_server sysfs_dmabuf_stats:dir r_dir_perms; 248allow system_server sysfs_dmabuf_stats:file r_file_perms; 249 250# Allow ActivityManager to look at the list of DMA-BUF heaps from /dev/dma_heap 251# for dumpsys meminfo 252allow system_server dmabuf_heap_device:dir r_dir_perms; 253 254# Allow reading /proc/vmstat for the oom kill count 255allow system_server proc_vmstat:file r_file_perms; 256 257# The DhcpClient and WifiWatchdog use packet_sockets 258allow system_server self:packet_socket create_socket_perms_no_ioctl; 259 260# 3rd party VPN clients require a tun_socket to be created 261allow system_server self:tun_socket create_socket_perms_no_ioctl; 262 263# Talk to init and various daemons via sockets. 264unix_socket_connect(system_server, lmkd, lmkd) 265unix_socket_connect(system_server, zygote, zygote) 266unix_socket_connect(system_server, uncrypt, uncrypt) 267 268# Allow system_server to write to statsd. 269unix_socket_send(system_server, statsdw, statsd) 270 271# Communicate over a socket created by surfaceflinger. 272allow system_server surfaceflinger:unix_stream_socket { read write setopt }; 273 274allow system_server gpuservice:unix_stream_socket { read write setopt }; 275 276# Communicate over a socket created by webview_zygote. 277allow system_server webview_zygote:unix_stream_socket { read write connectto setopt }; 278 279# Communicate over a socket created by app_zygote. 280allow system_server app_zygote:unix_stream_socket { read write connectto setopt }; 281 282# Perform Binder IPC. 283binder_use(system_server) 284binder_call(system_server, appdomain) 285binder_call(system_server, artd) 286binder_call(system_server, binderservicedomain) 287binder_call(system_server, composd) 288binder_call(system_server, dexopt_chroot_setup) 289binder_call(system_server, dumpstate) 290binder_call(system_server, fingerprintd) 291binder_call(system_server, gatekeeperd) 292binder_call(system_server, gpuservice) 293binder_call(system_server, idmap) 294binder_call(system_server, installd) 295binder_call(system_server, incidentd) 296binder_call(system_server, mmd) 297binder_call(system_server, netd) 298binder_call(system_server, ot_daemon) 299userdebug_or_eng(`binder_call(system_server, profcollectd)') 300binder_call(system_server, statsd) 301binder_call(system_server, storaged) 302binder_call(system_server, update_engine) 303binder_call(system_server, virtual_camera) 304binder_call(system_server, vold) 305binder_call(system_server, logd) 306binder_call(system_server, wificond) 307binder_call(system_server, uprobestats) 308binder_call(system_server, wifi_mainline_supplicant) 309binder_service(system_server) 310 311# Use HALs 312hal_client_domain(system_server, hal_allocator) 313hal_client_domain(system_server, hal_audio) 314hal_client_domain(system_server, hal_authgraph) 315hal_client_domain(system_server, hal_authsecret) 316hal_client_domain(system_server, hal_bluetooth) 317hal_client_domain(system_server, hal_broadcastradio) 318hal_client_domain(system_server, hal_codec2) 319hal_client_domain(system_server, hal_configstore) 320hal_client_domain(system_server, hal_contexthub) 321hal_client_domain(system_server, hal_face) 322hal_client_domain(system_server, hal_fingerprint) 323hal_client_domain(system_server, hal_gnss) 324hal_client_domain(system_server, hal_graphics_allocator) 325hal_client_domain(system_server, hal_health) 326hal_client_domain(system_server, hal_input_classifier) 327hal_client_domain(system_server, hal_input_processor) 328hal_client_domain(system_server, hal_ir) 329hal_client_domain(system_server, hal_keymint) 330hal_client_domain(system_server, hal_light) 331hal_client_domain(system_server, hal_mediaquality) 332hal_client_domain(system_server, hal_memtrack) 333hal_client_domain(system_server, hal_neuralnetworks) 334hal_client_domain(system_server, hal_oemlock) 335hal_client_domain(system_server, hal_omx) 336hal_client_domain(system_server, hal_power) 337hal_client_domain(system_server, hal_power_stats) 338hal_client_domain(system_server, hal_rebootescrow) 339hal_client_domain(system_server, hal_remotelyprovisionedcomponent_avf) 340hal_client_domain(system_server, hal_sensors) 341hal_client_domain(system_server, hal_secretkeeper) 342hal_client_domain(system_server, hal_tetheroffload) 343hal_client_domain(system_server, hal_thermal) 344hal_client_domain(system_server, hal_threadnetwork) 345hal_client_domain(system_server, hal_tv_cec) 346hal_client_domain(system_server, hal_tv_hdmi_cec) 347hal_client_domain(system_server, hal_tv_hdmi_connection) 348hal_client_domain(system_server, hal_tv_hdmi_earc) 349hal_client_domain(system_server, hal_tv_input) 350hal_client_domain(system_server, hal_usb) 351hal_client_domain(system_server, hal_usb_gadget) 352hal_client_domain(system_server, hal_uwb) 353hal_client_domain(system_server, hal_vibrator) 354hal_client_domain(system_server, hal_vr) 355hal_client_domain(system_server, hal_weaver) 356hal_client_domain(system_server, hal_wifi) 357hal_client_domain(system_server, hal_wifi_hostapd) 358hal_client_domain(system_server, hal_wifi_supplicant) 359# The bootctl is a pass through HAL mode under recovery mode. So we skip the 360# permission for recovery in order not to give system server the access to 361# the low level block devices. 362not_recovery(`hal_client_domain(system_server, hal_bootctl)') 363 364# Talk with graphics composer fences 365allow system_server hal_graphics_composer:fd use; 366 367# Use RenderScript always-passthrough HAL 368allow system_server hal_renderscript_hwservice:hwservice_manager find; 369allow system_server same_process_hal_file:file { execute read open getattr map }; 370 371# Talk to tombstoned to get ANR traces. 372unix_socket_connect(system_server, tombstoned_intercept, tombstoned) 373 374# List HAL interfaces to get ANR traces. 375allow system_server hwservicemanager:hwservice_manager list; 376allow system_server servicemanager:service_manager list; 377 378# Send signals to trigger ANR traces. 379allow system_server { 380 # This is derived from the list that system server defines as interesting native processes 381 # to dump during ANRs or watchdog aborts, defined in NATIVE_STACKS_OF_INTEREST in 382 # frameworks/base/services/core/java/com/android/server/Watchdog.java. 383 artd 384 audioserver 385 cameraserver 386 drmserver 387 gpuservice 388 inputflinger 389 keystore 390 mediadrmserver 391 mediaextractor 392 mediametrics 393 mediaserver 394 mediaswcodec 395 mediatranscoding 396 mediatuner 397 mmd 398 netd 399 sdcardd 400 servicemanager 401 statsd 402 surfaceflinger 403 vold 404 405 # This list comes from HAL_INTERFACES_OF_INTEREST in 406 # frameworks/base/services/core/java/com/android/server/Watchdog.java. 407 hal_audio_server 408 hal_bluetooth_server 409 hal_camera_server 410 hal_codec2_server 411 hal_drm_server 412 hal_face_server 413 hal_fingerprint_server 414 hal_gnss_server 415 hal_graphics_allocator_server 416 hal_graphics_composer_server 417 hal_health_server 418 hal_input_processor_server 419 hal_light_server 420 hal_neuralnetworks_server 421 hal_omx_server 422 hal_power_server 423 hal_power_stats_server 424 hal_sensors_server 425 hal_vibrator_server 426 hal_vr_server 427 system_suspend_server 428}:process { signal }; 429 430# Use sockets received over binder from various services. 431allow system_server audioserver:tcp_socket rw_socket_perms; 432allow system_server audioserver:udp_socket rw_socket_perms; 433allow system_server mediaserver:tcp_socket rw_socket_perms; 434allow system_server mediaserver:udp_socket rw_socket_perms; 435 436# Use sockets received over binder from various services. 437allow system_server mediadrmserver:tcp_socket rw_socket_perms; 438allow system_server mediadrmserver:udp_socket rw_socket_perms; 439 440# Write trace data to the Perfetto traced daemon. This requires connecting to 441# its producer socket and obtaining a (per-process) tmpfs fd. 442perfetto_producer(system_server) 443 444# Get file context 445allow system_server file_contexts_file:file r_file_perms; 446# access for mac_permissions 447allow system_server mac_perms_file: file r_file_perms; 448# Check SELinux permissions. 449selinux_check_access(system_server) 450 451allow system_server sysfs_type:dir r_dir_perms; 452 453r_dir_file(system_server, sysfs_android_usb) 454allow system_server sysfs_android_usb:file w_file_perms; 455 456r_dir_file(system_server, sysfs_extcon) 457 458r_dir_file(system_server, sysfs_ipv4) 459allow system_server sysfs_ipv4:file w_file_perms; 460 461r_dir_file(system_server, sysfs_rtc) 462r_dir_file(system_server, sysfs_switch) 463 464allow system_server sysfs_nfc_power_writable:file rw_file_perms; 465allow system_server sysfs_power:dir search; 466allow system_server sysfs_power:file rw_file_perms; 467allow system_server sysfs_thermal:dir search; 468allow system_server sysfs_thermal:file r_file_perms; 469allow system_server sysfs_uhid:dir r_dir_perms; 470allow system_server sysfs_uhid:file rw_file_perms; 471 472# TODO: Remove when HALs are forced into separate processes 473allow system_server sysfs_vibrator:file { write append }; 474 475# TODO: added to match above sysfs rule. Remove me? 476allow system_server sysfs_usb:file w_file_perms; 477 478# Access devices. 479allow system_server device:dir r_dir_perms; 480allow system_server mdns_socket:sock_file rw_file_perms; 481allow system_server gpu_device:chr_file rw_file_perms; 482allow system_server gpu_device:dir r_dir_perms; 483allow system_server sysfs_gpu:file r_file_perms; 484allow system_server input_device:dir r_dir_perms; 485allow system_server input_device:chr_file rw_file_perms; 486allow system_server tty_device:chr_file rw_file_perms; 487allow system_server usbaccessory_device:chr_file rw_file_perms; 488allow system_server video_device:dir r_dir_perms; 489allow system_server video_device:chr_file rw_file_perms; 490allow system_server adbd_socket:sock_file rw_file_perms; 491allow system_server rtc_device:chr_file rw_file_perms; 492allow system_server audio_device:dir r_dir_perms; 493allow system_server uhid_device:chr_file rw_file_perms; 494allow system_server hidraw_device:dir r_dir_perms; 495allow system_server hidraw_device:chr_file rw_file_perms; 496 497# write access to ALSA interfaces (/dev/snd/*) needed for MIDI 498allow system_server audio_device:chr_file rw_file_perms; 499 500# tun device used for 3rd party vpn apps and test network manager 501allow system_server tun_device:chr_file rw_file_perms; 502allowxperm system_server tun_device:chr_file ioctl { TUNGETIFF TUNSETIFF TUNSETLINK TUNSETCARRIER }; 503 504# Manage data/ota_package 505allow system_server ota_package_file:dir rw_dir_perms; 506allow system_server ota_package_file:file create_file_perms; 507 508# Manage system data files. 509allow system_server system_data_file:dir create_dir_perms; 510allow system_server system_data_file:notdevfile_class_set create_file_perms; 511allow system_server packages_list_file:file create_file_perms; 512allow system_server game_mode_intervention_list_file:file create_file_perms; 513allow system_server keychain_data_file:dir create_dir_perms; 514allow system_server keychain_data_file:file create_file_perms; 515allow system_server keychain_data_file:lnk_file create_file_perms; 516 517# Read the user parent directories like /data/user. Don't allow write access, 518# as vold is responsible for creating and deleting the subdirectories. 519allow system_server system_userdir_file:dir r_dir_perms; 520 521# Manage /data/app. 522allow system_server apk_data_file:dir create_dir_perms; 523allow system_server apk_data_file:{ file lnk_file } { create_file_perms link }; 524allow system_server apk_tmp_file:dir create_dir_perms; 525allow system_server apk_tmp_file:file create_file_perms; 526 527# Manage /data/app-metadata 528allow system_server apk_metadata_file:dir create_dir_perms; 529allow system_server apk_metadata_file:file create_file_perms; 530 531# Access input configuration files in the /vendor directory 532r_dir_file(system_server, vendor_keylayout_file) 533r_dir_file(system_server, vendor_keychars_file) 534r_dir_file(system_server, vendor_idc_file) 535get_prop(system_server, input_device_config_prop) 536 537# Access /vendor/{app,framework,overlay} 538r_dir_file(system_server, vendor_app_file) 539r_dir_file(system_server, vendor_framework_file) 540r_dir_file(system_server, vendor_overlay_file) 541 542# Manage /data/app-private. 543allow system_server apk_private_data_file:dir create_dir_perms; 544allow system_server apk_private_data_file:file create_file_perms; 545allow system_server apk_private_tmp_file:dir create_dir_perms; 546allow system_server apk_private_tmp_file:file create_file_perms; 547 548# Manage files within asec containers. 549allow system_server asec_apk_file:dir create_dir_perms; 550allow system_server asec_apk_file:file create_file_perms; 551allow system_server asec_public_file:file create_file_perms; 552 553# Manage /data/anr. 554# 555# TODO: Some of these permissions can be withdrawn once we've switched to the 556# new stack dumping mechanism, see b/32064548 and the rules below. In particular, 557# the system_server should never need to create a new anr_data_file:file or write 558# to one, but it will still need to read and append to existing files. 559allow system_server anr_data_file:dir create_dir_perms; 560allow system_server anr_data_file:file create_file_perms; 561 562# New stack dumping scheme : request an output FD from tombstoned via a unix 563# domain socket. 564# 565# Allow system_server to connect and write to the tombstoned java trace socket in 566# order to dump its traces. Also allow the system server to write its traces to 567# dumpstate during bugreport capture and incidentd during incident collection. 568unix_socket_connect(system_server, tombstoned_java_trace, tombstoned) 569allow system_server tombstoned:fd use; 570allow system_server dumpstate:fifo_file append; 571allow system_server incidentd:fifo_file append; 572# Write to a pipe created from `adb shell` (for debuggerd -j `pidof system_server`) 573userdebug_or_eng(` 574 allow system_server su:fifo_file append; 575') 576 577# Allow system_server to read pipes from incidentd (used to deliver incident reports 578# to dropbox) 579allow system_server incidentd:fifo_file read; 580 581# Read /data/misc/incidents - only read. The fd will be sent over binder, 582# with no DAC access to it, for dropbox to read. 583allow system_server incident_data_file:file read; 584 585# Manage /data/misc/prereboot. 586allow system_server prereboot_data_file:dir rw_dir_perms; 587allow system_server prereboot_data_file:file create_file_perms; 588 589# Allow tracing proxy service to read traces. Only the fd is sent over 590# binder. 591allow system_server perfetto_traces_data_file:file { read getattr }; 592allow system_server perfetto:fd use; 593 594# Allow system_server to exec the perfetto cmdline client and pass it a trace config 595domain_auto_trans(system_server, perfetto_exec, perfetto); 596allow system_server perfetto:fifo_file { read write }; 597 598# Allow system server to manage perfetto traces for ProfilingService. 599allow system_server perfetto_traces_profiling_data_file:dir rw_dir_perms; 600allow system_server perfetto_traces_profiling_data_file:file create_file_perms; 601allow system_server perfetto_traces_data_file:dir search; 602 603# Allow system server to exec the trace redactor cmdline client and kill the process for 604# ProfilingService. 605domain_auto_trans(system_server, trace_redactor_exec, trace_redactor); 606allow system_server trace_redactor:process signal; 607 608# Allow system server to kill perfetto processes for ProfilingService. 609allow system_server perfetto:process signal; 610 611# Manage /data/backup. 612allow system_server backup_data_file:dir create_dir_perms; 613allow system_server backup_data_file:file create_file_perms; 614 615# Write to /data/system/dropbox 616allow system_server dropbox_data_file:dir create_dir_perms; 617allow system_server dropbox_data_file:file create_file_perms; 618 619# Write to /data/system/heapdump 620allow system_server heapdump_data_file:dir rw_dir_perms; 621allow system_server heapdump_data_file:file create_file_perms; 622 623# Manage /data/misc/adb. 624allow system_server adb_keys_file:dir create_dir_perms; 625allow system_server adb_keys_file:file create_file_perms; 626 627# Manage /data/misc/appcompat. 628allow system_server appcompat_data_file:dir rw_dir_perms; 629allow system_server appcompat_data_file:file create_file_perms; 630 631# Manage /data/misc/connectivityblobdb. 632# Specifically, for vpn and wifi to create, read and write to an sqlite database. 633allow system_server connectivityblob_data_file:dir create_dir_perms; 634allow system_server connectivityblob_data_file:file create_file_perms; 635 636# Manage /data/misc/emergencynumberdb 637allow system_server emergency_data_file:dir create_dir_perms; 638allow system_server emergency_data_file:file create_file_perms; 639 640# Manage /data/misc/network_watchlist 641allow system_server network_watchlist_data_file:dir create_dir_perms; 642allow system_server network_watchlist_data_file:file create_file_perms; 643 644# Manage /data/misc/sms. 645# TODO: Split into a separate type? 646allow system_server radio_data_file:dir create_dir_perms; 647allow system_server radio_data_file:file create_file_perms; 648 649# Manage /data/misc/systemkeys. 650allow system_server systemkeys_data_file:dir create_dir_perms; 651allow system_server systemkeys_data_file:file create_file_perms; 652 653# Manage /data/misc/textclassifier. 654allow system_server textclassifier_data_file:dir create_dir_perms; 655allow system_server textclassifier_data_file:file create_file_perms; 656 657# Manage /data/tombstones. 658allow system_server tombstone_data_file:dir rw_dir_perms; 659allow system_server tombstone_data_file:file create_file_perms; 660 661# Manage /data/misc/vpn. 662allow system_server vpn_data_file:dir create_dir_perms; 663allow system_server vpn_data_file:file create_file_perms; 664 665# Manage /data/misc/wifi. 666allow system_server wifi_data_file:dir create_dir_perms; 667allow system_server wifi_data_file:file create_file_perms; 668 669# Manage /data/app-staging. 670allow system_server staging_data_file:dir create_dir_perms; 671allow system_server staging_data_file:file create_file_perms; 672 673# Manage /data/rollback. 674allow system_server staging_data_file:{ file lnk_file } { create_file_perms link }; 675 676# Walk /data/data subdirectories. 677allow system_server app_data_file_type:dir { getattr read search }; 678 679# Also permit for unlabeled /data/data subdirectories and 680# for unlabeled asec containers on upgrades from 4.2. 681allow system_server unlabeled:dir r_dir_perms; 682# Read pkg.apk file before it has been relabeled by vold. 683allow system_server unlabeled:file r_file_perms; 684 685# Populate com.android.providers.settings/databases/settings.db. 686allow system_server system_app_data_file:dir create_dir_perms; 687allow system_server system_app_data_file:file create_file_perms; 688 689# Receive and use open app data files passed over binder IPC. 690allow system_server app_data_file_type:file { getattr read write append map }; 691 692# Access to /data/media for measuring disk usage. 693allow system_server media_rw_data_file:dir { search getattr open read }; 694 695# Receive and use open /data/media files passed over binder IPC. 696# Also used for measuring disk usage. 697allow system_server media_rw_data_file:file { getattr read write append }; 698 699# System server needs to setfscreate to packages_list_file when writing 700# /data/system/packages.list 701allow system_server system_server:process setfscreate; 702 703# Relabel apk files. 704allow system_server { apk_tmp_file apk_private_tmp_file }:{ dir file } { relabelfrom relabelto }; 705allow system_server { apk_data_file apk_private_data_file }:{ dir file } { relabelfrom relabelto }; 706# Allow PackageManager to: 707# 1. rename file from /data/app-staging folder to /data/app 708# 2. relabel files (linked to /data/rollback) under /data/app-staging 709# during staged apk/apex install. 710allow system_server { staging_data_file }:{ dir file } { relabelfrom relabelto }; 711 712# Relabel wallpaper. 713allow system_server system_data_file:file relabelfrom; 714allow system_server wallpaper_file:file relabelto; 715allow system_server wallpaper_file:file { rw_file_perms rename unlink }; 716 717# Backup of wallpaper imagery uses temporary hard links to avoid data churn 718allow system_server { system_data_file wallpaper_file }:file link; 719 720# ShortcutManager icons 721allow system_server system_data_file:dir relabelfrom; 722allow system_server shortcut_manager_icons:dir { create_dir_perms relabelto }; 723allow system_server shortcut_manager_icons:file create_file_perms; 724 725# Manage ringtones. 726allow system_server ringtone_file:dir { create_dir_perms relabelto }; 727allow system_server ringtone_file:file create_file_perms; 728 729# Relabel icon file. 730allow system_server icon_file:file relabelto; 731allow system_server icon_file:file { rw_file_perms unlink }; 732 733# FingerprintService.java does a restorecon of the directory /data/system/users/[0-9]+/fpdata(/.*)? 734allow system_server system_data_file:dir relabelfrom; 735 736# server_configurable_flags_data_file is used for storing server configurable flags which 737# have been reset during current booting. system_server needs to read the data to perform related 738# disaster recovery actions. 739allow system_server server_configurable_flags_data_file:dir r_dir_perms; 740allow system_server server_configurable_flags_data_file:file r_file_perms; 741 742# Property Service write 743set_prop(system_server, system_prop) 744set_prop(system_server, bootanim_system_prop) 745set_prop(system_server, bluetooth_prop) 746set_prop(system_server, exported_system_prop) 747set_prop(system_server, exported3_system_prop) 748set_prop(system_server, safemode_prop) 749set_prop(system_server, theme_prop) 750set_prop(system_server, dhcp_prop) 751set_prop(system_server, net_connectivity_prop) 752set_prop(system_server, net_radio_prop) 753set_prop(system_server, net_dns_prop) 754set_prop(system_server, usb_control_prop) 755set_prop(system_server, usb_prop) 756set_prop(system_server, debug_prop) 757set_prop(system_server, powerctl_prop) 758set_prop(system_server, fingerprint_prop) 759set_prop(system_server, device_logging_prop) 760set_prop(system_server, dumpstate_options_prop) 761set_prop(system_server, overlay_prop) 762set_prop(system_server, exported_overlay_prop) 763set_prop(system_server, pm_prop) 764set_prop(system_server, exported_pm_prop) 765set_prop(system_server, socket_hook_prop) 766set_prop(system_server, audio_prop) 767set_prop(system_server, boot_status_prop) 768set_prop(system_server, surfaceflinger_color_prop) 769set_prop(system_server, provisioned_prop) 770set_prop(system_server, retaildemo_prop) 771set_prop(system_server, dmesgd_start_prop) 772set_prop(system_server, locale_prop) 773set_prop(system_server, timezone_metadata_prop) 774set_prop(system_server, timezone_prop) 775set_prop(system_server, crashrecovery_prop) 776userdebug_or_eng(`set_prop(system_server, wifi_log_prop)') 777userdebug_or_eng(`set_prop(system_server, system_user_mode_emulation_prop)') 778 779# ctl interface 780set_prop(system_server, ctl_default_prop) 781set_prop(system_server, ctl_bugreport_prop) 782set_prop(system_server, ctl_gsid_prop) 783set_prop(system_server, ctl_artd_pre_reboot_prop) 784 785# cppreopt property 786set_prop(system_server, cppreopt_prop) 787 788# server configurable flags properties 789set_prop(system_server, device_config_core_experiments_team_internal_prop) 790set_prop(system_server, device_config_edgetpu_native_prop) 791set_prop(system_server, device_config_input_native_boot_prop) 792set_prop(system_server, device_config_netd_native_prop) 793set_prop(system_server, device_config_nnapi_native_prop) 794set_prop(system_server, device_config_activity_manager_native_boot_prop) 795set_prop(system_server, device_config_runtime_native_boot_prop) 796set_prop(system_server, device_config_runtime_native_prop) 797set_prop(system_server, device_config_lmkd_native_prop) 798set_prop(system_server, device_config_media_native_prop) 799set_prop(system_server, device_config_camera_native_prop) 800set_prop(system_server, device_config_mglru_native_prop) 801set_prop(system_server, device_config_profcollect_native_boot_prop) 802set_prop(system_server, device_config_statsd_native_prop) 803set_prop(system_server, device_config_statsd_native_boot_prop) 804set_prop(system_server, device_config_storage_native_boot_prop) 805set_prop(system_server, device_config_swcodec_native_prop) 806set_prop(system_server, device_config_sys_traced_prop) 807set_prop(system_server, device_config_window_manager_native_boot_prop) 808set_prop(system_server, device_config_configuration_prop) 809set_prop(system_server, device_config_connectivity_prop) 810set_prop(system_server, device_config_surface_flinger_native_boot_prop) 811set_prop(system_server, device_config_aconfig_flags_prop) 812set_prop(system_server, device_config_vendor_system_native_prop) 813set_prop(system_server, device_config_vendor_system_native_boot_prop) 814set_prop(system_server, device_config_virtualization_framework_native_prop) 815set_prop(system_server, device_config_memory_safety_native_boot_prop) 816set_prop(system_server, device_config_memory_safety_native_prop) 817set_prop(system_server, device_config_remote_key_provisioning_native_prop) 818set_prop(system_server, device_config_tethering_u_or_later_native_prop) 819set_prop(system_server, device_config_mmd_native_prop) 820set_prop(system_server, smart_idle_maint_enabled_prop) 821set_prop(system_server, arm64_memtag_prop) 822 823# staged flag properties 824set_prop(system_server, next_boot_prop) 825 826# Allow system server to read pm.16kb.app_compat.disabled 827get_prop(system_server, pm_16kb_app_compat_prop) 828 829# Allow query ART device config properties 830get_prop(system_server, device_config_runtime_native_boot_prop) 831get_prop(system_server, device_config_runtime_native_prop) 832 833# BootReceiver to read ro.boot.bootreason 834get_prop(system_server, bootloader_boot_reason_prop) 835# PowerManager to read sys.boot.reason 836get_prop(system_server, system_boot_reason_prop) 837 838# Collect metrics on boot time created by init 839get_prop(system_server, boottime_prop) 840 841# Read device's serial number from system properties 842get_prop(system_server, serialno_prop) 843 844# Read/write the property which keeps track of whether this is the first start of system_server 845set_prop(system_server, firstboot_prop) 846 847# Audio service in system server can read audio config properties, 848# such as camera shutter enforcement 849get_prop(system_server, audio_config_prop) 850 851# StorageManager service reads media config while checking if transcoding is supported. 852get_prop(system_server, media_config_prop) 853 854# system server reads this property to keep track of whether server configurable flags have been 855# reset during current boot. 856get_prop(system_server, device_config_reset_performed_prop) 857 858# Read/write the property that enables Test Harness Mode 859set_prop(system_server, test_harness_prop) 860 861# Read gsid.image_running. 862get_prop(system_server, gsid_prop) 863 864# Read the property that mocks an OTA 865get_prop(system_server, mock_ota_prop) 866 867# Read the property as feature flag for protecting apks with fs-verity. 868get_prop(system_server, apk_verity_prop) 869 870# Read wifi.interface 871get_prop(system_server, wifi_prop) 872 873# Read the vendor property that indicates if Incremental features is enabled 874get_prop(system_server, incremental_prop) 875 876# Read ro.zram. properties 877get_prop(system_server, zram_config_prop) 878 879# Read/write persist.sys.zram_enabled 880set_prop(system_server, zram_control_prop) 881 882# Read/write persist.sys.dalvik.vm.lib.2 883set_prop(system_server, dalvik_runtime_prop) 884 885# Read ro.control_privapp_permissions and ro.cp_system_other_odex 886get_prop(system_server, packagemanager_config_prop) 887 888# Read the net.464xlat.cellular.enabled property (written by init). 889get_prop(system_server, net_464xlat_fromvendor_prop) 890 891# Read hypervisor capabilities ro.boot.hypervisor.* 892get_prop(system_server, hypervisor_prop) 893 894# Read persist.wm.debug. properties 895get_prop(system_server, persist_wm_debug_prop) 896 897# Read persist.sysui.notification.builder_extras_override property 898get_prop(system_server, persist_sysui_builder_extras_prop) 899# Read persist.sysui.notification.ranking_update_ashmem property 900get_prop(system_server, persist_sysui_ranking_update_prop) 901 902# Read ro.tuner.lazyhal 903get_prop(system_server, tuner_config_prop) 904# Write tuner.server.enable 905set_prop(system_server, tuner_server_ctl_prop) 906 907# Allow the heap dump ART plugin to the count of sessions waiting for OOME 908get_prop(system_server, traced_oome_heap_session_count_prop) 909 910# Allow the sensor service (running in the system service) to read sensor 911# configuration properties 912get_prop(system_server, sensors_config_prop) 913 914# Allow system server to determine if system services are enabled 915get_prop(system_server, system_service_enable_prop) 916 917# Create a socket for connections from debuggerd. 918allow system_server system_ndebug_socket:sock_file create_file_perms; 919 920# Create a socket for connections from zygotes. 921allow system_server system_unsolzygote_socket:sock_file create_file_perms; 922 923# Manage cache files. 924allow system_server cache_file:lnk_file r_file_perms; 925allow system_server { cache_file cache_recovery_file }:dir { relabelfrom create_dir_perms }; 926allow system_server { cache_file cache_recovery_file }:file { relabelfrom create_file_perms }; 927allow system_server { cache_file cache_recovery_file }:fifo_file create_file_perms; 928 929allow system_server system_file:dir r_dir_perms; 930allow system_server system_file:lnk_file r_file_perms; 931 932# ART locks profile files. 933allow system_server system_file:file lock; 934 935# LocationManager(e.g, GPS) needs to read and write 936# to uart driver and ctrl proc entry 937allow system_server gps_control:file rw_file_perms; 938 939# Allow system_server to use app-created sockets and pipes. 940allow system_server appdomain:{ tcp_socket udp_socket } { getattr getopt setopt read write shutdown }; 941allow system_server appdomain:{ fifo_file unix_stream_socket } { getattr read write }; 942 943# BackupManagerService needs to manipulate backup data files 944allow system_server cache_backup_file:dir rw_dir_perms; 945allow system_server cache_backup_file:file create_file_perms; 946# LocalTransport works inside /cache/backup 947allow system_server cache_private_backup_file:dir create_dir_perms; 948allow system_server cache_private_backup_file:file create_file_perms; 949 950# Allow system to talk to usb device 951allow system_server usb_device:chr_file rw_file_perms; 952allow system_server usb_device:dir r_dir_perms; 953 954# Read and delete files under /dev/fscklogs. 955r_dir_file(system_server, fscklogs) 956allow system_server fscklogs:dir { write remove_name add_name }; 957allow system_server fscklogs:file rename; 958 959# logd access, system_server inherit logd write socket 960# (urge is to deprecate this long term) 961allow system_server zygote:unix_dgram_socket write; 962 963# Read from log daemon. 964read_logd(system_server) 965read_runtime_log_tags(system_server) 966 967# Be consistent with DAC permissions. Allow system_server to write to 968# /sys/module/lowmemorykiller/parameters/adj 969# /sys/module/lowmemorykiller/parameters/minfree 970allow system_server sysfs_lowmemorykiller:file { getattr w_file_perms }; 971 972# Read /sys/fs/pstore/console-ramoops 973# Don't worry about overly broad permissions for now, as there's 974# only one file in /sys/fs/pstore 975allow system_server pstorefs:dir r_dir_perms; 976allow system_server pstorefs:file r_file_perms; 977 978# /sys access 979allow system_server sysfs_zram:dir search; 980allow system_server sysfs_zram:file rw_file_perms; 981 982# Read /sys/fs/selinux/policy 983allow system_server kernel:security read_policy; 984 985add_service(system_server, system_server_service); 986allow system_server artd_service:service_manager find; 987allow system_server artd_pre_reboot_service:service_manager find; 988allow system_server audioserver_service:service_manager find; 989allow system_server authorization_service:service_manager find; 990allow system_server batteryproperties_service:service_manager find; 991allow system_server cameraserver_service:service_manager find; 992allow system_server compos_service:service_manager find; 993allow system_server dataloader_manager_service:service_manager find; 994allow system_server dexopt_chroot_setup_service:service_manager find; 995allow system_server dnsresolver_service:service_manager find; 996allow system_server drmserver_service:service_manager find; 997allow system_server dumpstate_service:service_manager find; 998allow system_server fingerprintd_service:service_manager find; 999allow system_server gatekeeper_service:service_manager find; 1000allow system_server gpu_service:service_manager find; 1001allow system_server gsi_service:service_manager find; 1002allow system_server idmap_service:service_manager find; 1003allow system_server incident_service:service_manager find; 1004allow system_server incremental_service:service_manager find; 1005allow system_server installd_service:service_manager find; 1006allow system_server keystore_maintenance_service:service_manager find; 1007allow system_server keystore_metrics_service:service_manager find; 1008allow system_server keystore_service:service_manager find; 1009allow system_server mdns_service:service_manager find; 1010allow system_server mediaserver_service:service_manager find; 1011allow system_server mediametrics_service:service_manager find; 1012allow system_server mediaextractor_service:service_manager find; 1013allow system_server mediadrmserver_service:service_manager find; 1014allow system_server mediatuner_service:service_manager find; 1015allow system_server mmd_service:service_manager find; 1016allow system_server netd_service:service_manager find; 1017allow system_server nfc_service:service_manager find; 1018allow system_server ot_daemon_service:service_manager find; 1019allow system_server radio_service:service_manager find; 1020allow system_server stats_service:service_manager find; 1021allow system_server storaged_service:service_manager find; 1022allow system_server surfaceflinger_service:service_manager find; 1023allow system_server update_engine_service:service_manager find; 1024allow system_server virtual_camera_service:service_manager find; 1025is_flag_enabled(RELEASE_AVF_ENABLE_LLPVM_CHANGES, ` 1026 allow system_server virtualization_maintenance_service:service_manager find; 1027') 1028allow system_server vold_service:service_manager find; 1029allow system_server wifinl80211_service:service_manager find; 1030allow system_server logd_service:service_manager find; 1031userdebug_or_eng(` 1032 allow system_server profcollectd_service:service_manager find; 1033') 1034allow system_server wifi_mainline_supplicant_service:service_manager find; 1035 1036add_service(system_server, batteryproperties_service) 1037 1038allow system_server keystore:keystore2 { 1039 add_auth 1040 change_password 1041 change_user 1042 clear_ns 1043 clear_uid 1044 delete_all_keys 1045 get_last_auth_time 1046 lock 1047 pull_metrics 1048 reset 1049 unlock 1050}; 1051 1052allow system_server keystore:keystore2_key { 1053 delete 1054 use_dev_id 1055 grant 1056 get_info 1057 rebind 1058 update 1059 use 1060}; 1061 1062# Allow Wifi module to manage Wi-Fi keys. 1063allow system_server wifi_key:keystore2_key { 1064 delete 1065 get_info 1066 rebind 1067 update 1068 use 1069}; 1070 1071# Allow lock_settings service to manage RoR keys. 1072allow system_server resume_on_reboot_key:keystore2_key { 1073 delete 1074 get_info 1075 rebind 1076 update 1077 use 1078}; 1079 1080# Allow lock_settings service to manage locksettings keys (e.g. the synthetic password key). 1081allow system_server locksettings_key:keystore2_key { 1082 delete 1083 get_info 1084 rebind 1085 update 1086 use 1087}; 1088 1089 1090# Allow system server to search and write to the persistent factory reset 1091# protection partition. This block device does not get wiped in a factory reset. 1092allow system_server block_device:dir search; 1093allow system_server frp_block_device:blk_file rw_file_perms; 1094allowxperm system_server frp_block_device:blk_file ioctl { BLKSECDISCARD BLKDISCARD }; 1095 1096# Create new process groups and clean up old cgroups 1097allow system_server cgroup:dir create_dir_perms; 1098allow system_server cgroup:file setattr; 1099allow system_server cgroup_v2:dir create_dir_perms; 1100allow system_server cgroup_v2:file { r_file_perms setattr }; 1101 1102# /oem access 1103r_dir_file(system_server, oemfs) 1104 1105# Allow resolving per-user storage symlinks 1106allow system_server { mnt_user_file storage_file }:dir { getattr search }; 1107allow system_server { mnt_user_file storage_file }:lnk_file { getattr read }; 1108 1109# Allow statfs() on storage devices, which happens fast enough that 1110# we shouldn't be killed during unsafe removal 1111allow system_server { sdcard_type fuse }:dir { getattr search }; 1112 1113# Traverse into expanded storage 1114allow system_server mnt_expand_file:dir r_dir_perms; 1115 1116# Allow system process to relabel the fingerprint directory after mkdir 1117# and delete the directory and files when no longer needed 1118allow system_server fingerprintd_data_file:dir { r_dir_perms remove_name rmdir relabelto write }; 1119allow system_server fingerprintd_data_file:file { getattr unlink }; 1120 1121userdebug_or_eng(` 1122 # Allow system server to create and write method traces in /data/misc/trace. 1123 allow system_server method_trace_data_file:dir w_dir_perms; 1124 allow system_server method_trace_data_file:file { create w_file_perms }; 1125 1126 # Allow system server to read dmesg 1127 allow system_server kernel:system syslog_read; 1128 1129 # Allow writing and removing window traces in /data/misc/wmtrace. 1130 allow system_server wm_trace_data_file:dir rw_dir_perms; 1131 allow system_server wm_trace_data_file:file { getattr setattr create unlink w_file_perms }; 1132 1133 # Allow writing and removing accessibility traces in /data/misc/a11ytrace. 1134 allow system_server accessibility_trace_data_file:dir rw_dir_perms; 1135 allow system_server accessibility_trace_data_file:file { getattr setattr create unlink w_file_perms }; 1136') 1137 1138# For AppFuse. 1139allow system_server vold:fd use; 1140allow system_server fuse_device:chr_file { read write ioctl getattr }; 1141allow system_server app_fuse_file:file { read write getattr }; 1142 1143# For configuring sdcardfs 1144allow system_server configfs:dir { create_dir_perms }; 1145allow system_server configfs:file { getattr open create unlink write }; 1146 1147# Connect to adbd and use a socket transferred from it. 1148# Used for e.g. jdwp. 1149allow system_server adbd_common:unix_stream_socket connectto; 1150allow system_server adbd_common:fd use; 1151allow system_server adbd_common:unix_stream_socket { getattr getopt ioctl read write shutdown }; 1152 1153# Read service.adb.tls.port, persist.adb.wifi. properties 1154get_prop(system_server, adbd_prop) 1155 1156# Set persist.adb.tls_server.enable property 1157set_prop(system_server, system_adbd_prop) 1158 1159# Set service.adbd.tradeinmode from ITradeInService. 1160set_prop(system_server, adbd_tradeinmode_prop) 1161 1162# Allow invoking tools like "timeout" 1163allow system_server toolbox_exec:file rx_file_perms; 1164 1165# Allow system process to setup fs-verity 1166allowxperm system_server { apk_data_file apk_tmp_file system_data_file apex_system_server_data_file }:file ioctl FS_IOC_ENABLE_VERITY; 1167 1168# Allow system process to measure fs-verity for apps, including those being installed 1169allowxperm system_server { apk_data_file apk_tmp_file }:file ioctl FS_IOC_MEASURE_VERITY; 1170allowxperm system_server apk_tmp_file:file ioctl FS_IOC_SETFLAGS; 1171 1172# Postinstall 1173# 1174# For OTA dexopt, allow calls coming from postinstall. 1175binder_call(system_server, postinstall) 1176 1177allow system_server postinstall:fifo_file write; 1178allow system_server update_engine:fd use; 1179allow system_server update_engine:fifo_file write; 1180 1181# Access to /data/preloads 1182allow system_server preloads_data_file:file { r_file_perms unlink }; 1183allow system_server preloads_data_file:dir { r_dir_perms write remove_name rmdir }; 1184allow system_server preloads_media_file:file { r_file_perms unlink }; 1185allow system_server preloads_media_file:dir { r_dir_perms write remove_name rmdir }; 1186 1187r_dir_file(system_server, cgroup) 1188r_dir_file(system_server, cgroup_v2) 1189allow system_server ion_device:chr_file r_file_perms; 1190 1191# Access to /dev/dma_heap/system 1192allow system_server dmabuf_system_heap_device:chr_file r_file_perms; 1193# Access to /dev/dma_heap/system-secure 1194allow system_server dmabuf_system_secure_heap_device:chr_file r_file_perms; 1195 1196r_dir_file(system_server, proc_asound) 1197r_dir_file(system_server, proc_net_type) 1198r_dir_file(system_server, proc_qtaguid_stat) 1199allow system_server { 1200 proc_cmdline 1201 proc_loadavg 1202 proc_locks 1203 proc_meminfo 1204 proc_pagetypeinfo 1205 proc_pipe_conf 1206 proc_stat 1207 proc_uid_cputime_showstat 1208 proc_uid_io_stats 1209 proc_uid_time_in_state 1210 proc_uid_concurrent_active_time 1211 proc_uid_concurrent_policy_time 1212 proc_version 1213 proc_vmallocinfo 1214}:file r_file_perms; 1215 1216allow system_server proc_uid_time_in_state:dir r_dir_perms; 1217allow system_server proc_uid_cpupower:file r_file_perms; 1218 1219r_dir_file(system_server, rootfs) 1220 1221# Allow WifiService to start, stop, and read wifi-specific trace events. 1222allow system_server debugfs_tracing_instances:dir search; 1223allow system_server debugfs_wifi_tracing:dir search; 1224allow system_server debugfs_wifi_tracing:file rw_file_perms; 1225 1226# Allow BootReceiver to watch trace error_report events. 1227allow system_server debugfs_bootreceiver_tracing:dir search; 1228allow system_server debugfs_bootreceiver_tracing:file r_file_perms; 1229 1230# Allow system_server to read tracepoint ids in order to attach BPF programs to them. 1231allow system_server debugfs_tracing:file r_file_perms; 1232 1233# allow system_server to exec shell, asanwrapper & zygote(app_process) on ASAN builds. Needed to run 1234# asanwrapper. 1235with_asan(` 1236 allow system_server shell_exec:file rx_file_perms; 1237 allow system_server asanwrapper_exec:file rx_file_perms; 1238 allow system_server zygote_exec:file rx_file_perms; 1239') 1240 1241# allow system_server to read the eBPF maps that stores the traffic stats information and update 1242# the map after snapshot is recorded, and to read, update and run the maps and programs used for 1243# time in state accounting 1244allow system_server { fs_bpf fs_bpf_net_shared fs_bpf_netd_readonly fs_bpf_netd_shared }:dir search; 1245allow system_server { fs_bpf fs_bpf_net_shared fs_bpf_netd_readonly fs_bpf_netd_shared }:file { getattr read write }; 1246allow system_server bpfloader:bpf prog_run; 1247allow system_server self:bpf map_create; 1248allow system_server { bpfloader netd network_stack system_server }:bpf { map_read map_write }; 1249# in order to invoke side effect of close() on such a socket calling synchronize_rcu() 1250allow system_server self:key_socket create; 1251# Java's Os.close() in libcore/luni/src/main/java/libcore/io/BlockGuardOs.java;l=100 1252# calls if (fd.isSocket$()) if (isLingerSocket(fd)) ... 1253dontaudit system_server self:key_socket getopt; 1254 1255# Needed to interact with memevents-eBPF and receive notifications for memory events 1256allow system_server fs_bpf_memevents:dir search; 1257allow system_server fs_bpf_memevents:file { read write }; 1258 1259# Allow system_server to start clatd in its own domain and kill it. 1260domain_auto_trans(system_server, clatd_exec, clatd) 1261allow system_server clatd:process { sigkill signal }; 1262 1263# ART Profiles. 1264# Allow system_server to open profile snapshots for read. 1265# System server never reads the actual content. It passes the descriptor to 1266# to privileged apps which acquire the permissions to inspect the profiles. 1267allow system_server { user_profile_root_file user_profile_data_file}:dir { getattr search }; 1268allow system_server user_profile_data_file:file { getattr open read }; 1269 1270# System server may dump profile data for debuggable apps in the /data/misc/profman. 1271# As such it needs to be able create files but it should never read from them. 1272# It also needs to stat the directory to check if it has the right permissions. 1273allow system_server profman_dump_data_file:file { create getattr setattr w_file_perms}; 1274allow system_server profman_dump_data_file:dir rw_dir_perms; 1275 1276# On userdebug build we may profile system server. Allow it to write and create its own profile. 1277userdebug_or_eng(` 1278 allow system_server user_profile_data_file:dir w_dir_perms; 1279 allow system_server user_profile_data_file:file create_file_perms; 1280') 1281# Allow system server to load JVMTI agents under control of a property. 1282get_prop(system_server,system_jvmti_agent_prop) 1283 1284# UsbDeviceManager uses /dev/usb-ffs 1285allow system_server functionfs:dir search; 1286allow system_server functionfs:file rw_file_perms; 1287# To resolve arbitrary sysfs paths from /sys/class/udc/* symlinks. 1288starting_at_board_api(202504, ` 1289allow system_server sysfs_type:dir search; 1290r_dir_file(system_server, sysfs_udc) 1291') 1292 1293# system_server contains time / time zone detection logic so reads the associated properties. 1294get_prop(system_server, time_prop) 1295 1296# system_server reads this property to know it should expect the lmkd sends notification to it 1297# on low memory kills. 1298get_prop(system_server, system_lmk_prop) 1299 1300get_prop(system_server, wifi_config_prop) 1301 1302# Only system server can access BINDER_FREEZE and BINDER_GET_FROZEN_INFO 1303allowxperm system_server binder_device:chr_file ioctl { BINDER_FREEZE BINDER_GET_FROZEN_INFO }; 1304 1305# Watchdog prints debugging log to /dev/kmsg_debug. 1306userdebug_or_eng(` 1307 allow system_server kmsg_debug_device:chr_file { open append getattr }; 1308') 1309# Watchdog reads sysprops framework_watchdog.fatal_* to handle watchdog timeout loop. 1310get_prop(system_server, framework_watchdog_config_prop) 1311 1312 1313# Font files are written by system server 1314allow system_server font_data_file:file create_file_perms; 1315allow system_server font_data_file:dir create_dir_perms; 1316# Allow system process to setup and measure fs-verity for font files 1317allowxperm system_server font_data_file:file ioctl { FS_IOC_ENABLE_VERITY FS_IOC_MEASURE_VERITY }; 1318 1319# Read qemu.hw.mainkeys property 1320get_prop(system_server, qemu_hw_prop) 1321 1322# Allow system server to read profcollectd reports for upload. 1323userdebug_or_eng(`r_dir_file(system_server, profcollectd_data_file)') 1324 1325# Power controls for debugging/diagnostics 1326get_prop(system_server, power_debug_prop) 1327set_prop(system_server, power_debug_prop) 1328 1329### 1330### Neverallow rules 1331### 1332### system_server should NEVER do any of this 1333 1334# Do not allow opening files from external storage as unsafe ejection 1335# could cause the kernel to kill the system_server. 1336neverallow system_server { sdcard_type fuse }:dir { open read write }; 1337neverallow system_server { sdcard_type fuse }:file rw_file_perms; 1338 1339# system server should never be operating on zygote spawned app data 1340# files directly. Rather, they should always be passed via a 1341# file descriptor. 1342# Exclude those types that system_server needs to open directly. 1343neverallow system_server { 1344 app_data_file_type 1345 -system_app_data_file 1346 -radio_data_file 1347}:file { open create unlink link }; 1348 1349# Forking and execing is inherently dangerous and racy. See, for 1350# example, https://www.linuxprogrammingblog.com/threads-and-fork-think-twice-before-using-them 1351# Prevent the addition of new file execs to stop the problem from 1352# getting worse. b/28035297 1353neverallow system_server { 1354 file_type 1355 -toolbox_exec 1356 -logcat_exec 1357 with_asan(`-shell_exec -asanwrapper_exec -zygote_exec') 1358}:file execute_no_trans; 1359 1360# Ensure that system_server doesn't perform any domain transitions other than 1361# transitioning to the crash_dump domain when a crash occurs or fork clatd. 1362# add perfetto and trace_redactor which are exec'd from system server for ProfilingService. 1363neverallow system_server { domain -clatd -crash_dump -perfetto -trace_redactor }:process transition; 1364neverallow system_server *:process dyntransition; 1365 1366# Ensure that system_server doesn't access anything but search in perfetto_traces_data_file:dir. 1367neverallow system_server perfetto_traces_data_file:dir ~search; 1368 1369# Only allow crash_dump to connect to system_ndebug_socket. 1370neverallow { domain -init -system_server -crash_dump } system_ndebug_socket:sock_file { open write }; 1371 1372# Only allow zygotes to connect to system_unsolzygote_socket. 1373neverallow { 1374 domain 1375 -init 1376 -system_server 1377 -zygote 1378 -app_zygote 1379 -webview_zygote 1380} system_unsolzygote_socket:sock_file { open write }; 1381 1382# Only allow init, system_server, flags_health_check to set properties for server configurable flags 1383neverallow { 1384 domain 1385 -init 1386 -system_server 1387 -flags_health_check 1388} { 1389 device_config_core_experiments_team_internal_prop 1390 device_config_activity_manager_native_boot_prop 1391 device_config_connectivity_prop 1392 device_config_input_native_boot_prop 1393 device_config_lmkd_native_prop 1394 device_config_netd_native_prop 1395 device_config_nnapi_native_prop 1396 device_config_edgetpu_native_prop 1397 device_config_runtime_native_boot_prop 1398 device_config_runtime_native_prop 1399 device_config_media_native_prop 1400 device_config_mglru_native_prop 1401 device_config_remote_key_provisioning_native_prop 1402 device_config_storage_native_boot_prop 1403 device_config_surface_flinger_native_boot_prop 1404 device_config_sys_traced_prop 1405 device_config_swcodec_native_prop 1406 device_config_aconfig_flags_prop 1407 device_config_window_manager_native_boot_prop 1408 device_config_tethering_u_or_later_native_prop 1409 device_config_mmd_native_prop 1410 next_boot_prop 1411}:property_service set; 1412 1413# Only allow system_server and init to set tuner_server_ctl_prop 1414neverallow { 1415 domain 1416 -system_server 1417 -init 1418} tuner_server_ctl_prop:property_service set; 1419 1420# system_server should never be executing dex2oat. This is either 1421# a bug (for example, bug 16317188), or represents an attempt by 1422# system server to dynamically load a dex file, something we do not 1423# want to allow. 1424neverallow system_server dex2oat_exec:file no_x_file_perms; 1425 1426# system_server should never execute or load executable shared libraries 1427# in /data. Executable files in /data are a persistence vector. 1428# https://bugs.chromium.org/p/project-zero/issues/detail?id=955 for example. 1429neverallow system_server data_file_type:file no_x_file_perms; 1430 1431# The only block device system_server should be writing to is 1432# the frp_block_device. This helps avoid a system_server to root 1433# escalation by writing to raw block devices. 1434# The system_server may need to read from vd_device if it uses 1435# block apexes. 1436neverallow system_server { dev_type -frp_block_device }:blk_file no_w_file_perms; 1437neverallow system_server { dev_type -frp_block_device -vd_device }:blk_file r_file_perms; 1438 1439# system_server should never use JIT functionality 1440# See https://googleprojectzero.blogspot.com/2016/12/bitunmap-attacking-android-ashmem.html 1441# in the section titled "A Short ROP Chain" for why. 1442# However, in emulator builds without OpenGL passthrough, we use software 1443# rendering via SwiftShader, which requires JIT support. These builds are 1444# never shipped to users. 1445ifelse(target_requires_insecure_execmem_for_swiftshader, `true', 1446 `allow system_server self:process execmem;', 1447 `neverallow system_server self:process execmem;') 1448neverallow system_server { ashmem_device ashmem_libcutils_device }:chr_file execute; 1449 1450# TODO: deal with tmpfs_domain pub/priv split properly 1451neverallow system_server system_server_tmpfs:file execute; 1452 1453# Resources handed off by system_server_startup 1454allow system_server system_server_startup:fd use; 1455allow system_server system_server_startup_tmpfs:file { read write map }; 1456allow system_server system_server_startup:unix_dgram_socket write; 1457 1458# Allow system server to communicate to apexd 1459allow system_server apex_service:service_manager find; 1460allow system_server apexd:binder call; 1461 1462# Allow system server to scan /apex for flattened APEXes 1463allow system_server apex_mnt_dir:dir r_dir_perms; 1464 1465# Allow system server to read /apex/apex-info-list.xml 1466allow system_server apex_info_file:file r_file_perms; 1467 1468# Allow system_server to communicate with tradeinmode. 1469binder_call(system_server, tradeinmode) 1470 1471# Allow system server to communicate to system-suspend's control interface 1472allow system_server system_suspend_control_internal_service:service_manager find; 1473allow system_server system_suspend_control_service:service_manager find; 1474binder_call(system_server, system_suspend) 1475binder_call(system_suspend, system_server) 1476 1477# Allow system server to communicate to system-suspend's wakelock interface 1478wakelock_use(system_server) 1479 1480# Allow the system server to read files under /data/apex. The system_server 1481# needs these privileges to compare file signatures while processing installs. 1482# 1483# Only apexd is allowed to create new entries or write to any file under /data/apex. 1484allow system_server apex_data_file:dir { getattr search }; 1485allow system_server apex_data_file:file r_file_perms; 1486 1487# Allow the system server to read files under /vendor/apex. This is where 1488# vendor APEX packages might be installed and system_server needs to parse 1489# these packages to inspect the signatures and other metadata. 1490allow system_server vendor_apex_file:dir { getattr search }; 1491allow system_server vendor_apex_file:file r_file_perms; 1492 1493# Allow the system server to manage relevant apex module data files. 1494allow system_server apex_module_data_file:dir { getattr search }; 1495# These are modules where the code runs in system_server, so we need full access. 1496allow system_server apex_system_server_data_file:dir create_dir_perms; 1497allow system_server apex_system_server_data_file:file create_file_perms; 1498allow system_server apex_tethering_data_file:dir create_dir_perms; 1499allow system_server apex_tethering_data_file:file create_file_perms; 1500allow system_server apex_uwb_data_file:dir create_dir_perms; 1501allow system_server apex_uwb_data_file:file create_file_perms; 1502# Legacy labels that we still need to support (b/217581286) 1503allow system_server { 1504 apex_appsearch_data_file 1505 apex_permission_data_file 1506 apex_scheduling_data_file 1507 apex_wifi_data_file 1508}:dir create_dir_perms; 1509allow system_server { 1510 apex_appsearch_data_file 1511 apex_permission_data_file 1512 apex_scheduling_data_file 1513 apex_wifi_data_file 1514}:file create_file_perms; 1515 1516# Allow PasswordSlotManager rw access to /metadata/password_slots, so GSIs and the host image can 1517# communicate which slots are available for use. 1518allow system_server metadata_file:dir search; 1519allow system_server password_slot_metadata_file:dir rw_dir_perms; 1520allow system_server password_slot_metadata_file:file create_file_perms; 1521 1522# Allow TradeInMode service rw access to /metadata/tradeinmode. 1523allow system_server tradeinmode_metadata_file:dir rw_dir_perms; 1524allow system_server tradeinmode_metadata_file:file create_file_perms; 1525 1526allow system_server userspace_reboot_metadata_file:dir create_dir_perms; 1527allow system_server userspace_reboot_metadata_file:file create_file_perms; 1528 1529# Allow system server rw access to files in /metadata/staged-install folder 1530allow system_server staged_install_file:dir rw_dir_perms; 1531allow system_server staged_install_file:file create_file_perms; 1532 1533allow system_server watchdog_metadata_file:dir rw_dir_perms; 1534allow system_server watchdog_metadata_file:file create_file_perms; 1535 1536# allow system_server write to aconfigd socket 1537unix_socket_connect(system_server, aconfigd, aconfigd); 1538 1539# allow system_server write to aconfigd_mainline socket 1540unix_socket_connect(system_server, aconfigd_mainline, aconfigd_mainline); 1541 1542allow system_server repair_mode_metadata_file:dir rw_dir_perms; 1543allow system_server repair_mode_metadata_file:file create_file_perms; 1544 1545allow system_server gsi_persistent_data_file:dir rw_dir_perms; 1546allow system_server gsi_persistent_data_file:file create_file_perms; 1547 1548# Allow system server read and remove files under /data/misc/odrefresh 1549allow system_server odrefresh_data_file:dir rw_dir_perms; 1550allow system_server odrefresh_data_file:file { r_file_perms unlink }; 1551 1552# Allow system server r access to /system/bin/surfaceflinger for PinnerService. 1553allow system_server surfaceflinger_exec:file r_file_perms; 1554 1555# Allow init to set sysprop used to compute stats about userspace reboot. 1556set_prop(system_server, userspace_reboot_log_prop) 1557 1558# JVMTI agent settings are only readable from the system server. 1559neverallow { 1560 domain 1561 -system_server 1562 -dumpstate 1563 -init 1564 -vendor_init 1565} { 1566 system_jvmti_agent_prop 1567}:file no_rw_file_perms; 1568 1569# Read/Write /proc/pressure/memory 1570allow system_server proc_pressure_mem:file rw_file_perms; 1571# Read /proc/pressure/cpu and /proc/pressure/io 1572allow system_server { proc_pressure_cpu proc_pressure_io }:file r_file_perms; 1573 1574# No ptracing others 1575neverallow system_server { domain -system_server }:process ptrace; 1576 1577# CAP_SYS_RESOURCE was traditionally needed for sensitive /proc/PID 1578# file read access. However, that is now unnecessary (b/34951864) 1579neverallow system_server system_server:global_capability_class_set sys_resource; 1580 1581# Only system_server/init should access /metadata/password_slots. 1582neverallow { domain -init -system_server } password_slot_metadata_file:dir *; 1583neverallow { 1584 domain 1585 -init 1586 -system_server 1587} password_slot_metadata_file:notdevfile_class_set ~{ relabelto getattr }; 1588neverallow { domain -init -system_server } password_slot_metadata_file:notdevfile_class_set *; 1589 1590# Allow systemserver to read/write the invalidation property 1591set_prop(system_server, binder_cache_system_server_prop) 1592neverallow { domain -system_server -init } 1593 binder_cache_system_server_prop:property_service set; 1594 1595# Allow system server to attach BPF programs to tracepoints. Deny read permission so that 1596# system_server cannot use this access to read perf event data like process stacks. 1597allow system_server self:perf_event { open write cpu kernel }; 1598neverallow system_server self:perf_event ~{ open write cpu kernel }; 1599 1600# Allow writing files under /data/system/shutdown-checkpoints/ 1601allow system_server shutdown_checkpoints_system_data_file:dir create_dir_perms; 1602allow system_server shutdown_checkpoints_system_data_file:file create_file_perms; 1603 1604# Do not allow any domain other than init or system server to set the property 1605neverallow { domain -init -system_server } socket_hook_prop:property_service set; 1606 1607neverallow { domain -init -system_server } boot_status_prop:property_service set; 1608 1609neverallow { 1610 domain 1611 -init 1612 -vendor_init 1613 -dumpstate 1614 -system_server 1615} wifi_config_prop:file no_rw_file_perms; 1616 1617# Only allow system server to write uhid sysfs files 1618neverallow { 1619 domain 1620 -init 1621 -system_server 1622 -ueventd 1623 -vendor_init 1624} sysfs_uhid:file no_w_file_perms; 1625 1626# BINDER_FREEZE is used to block ipc transactions to frozen processes, so it 1627# can be accessed by system_server only (b/143717177) 1628# BINDER_GET_FROZEN_INFO is used by system_server to determine the state of a frozen binder 1629# interface 1630neverallowxperm { domain -system_server } binder_device:chr_file ioctl { BINDER_FREEZE BINDER_GET_FROZEN_INFO }; 1631 1632# Only system server can write the font files. 1633neverallow { domain -init -system_server } font_data_file:file no_w_file_perms; 1634neverallow { domain -init -system_server } font_data_file:dir no_w_dir_perms; 1635 1636# Allow reading /system/etc/font_fallback.xml 1637allow system_server system_font_fallback_file:file r_file_perms; 1638 1639# Allow system server to set dynamic ART properties. 1640set_prop(system_server, dalvik_dynamic_config_prop) 1641 1642# Allow system server to read binderfs 1643allow system_server binderfs_logs:dir r_dir_perms; 1644allow system_server binderfs_logs_stats:file r_file_perms; 1645 1646# For ANRs 1647userdebug_or_eng(` 1648 allow system_server binderfs_logs_transactions:file r_file_perms; 1649') 1650 1651# Allow GameManagerService to read and write persist.graphics.game_default_frame_rate.enabled 1652set_prop(system_server, game_manager_config_prop) 1653 1654# ThreadNetworkService reads Thread Network properties 1655get_prop(system_server, threadnetwork_config_prop) 1656 1657# Do not allow any domain other than init and system server to set the property 1658neverallow { 1659 domain 1660 -init 1661 -vendor_init 1662 -dumpstate 1663 -system_server 1664} threadnetwork_config_prop:file no_rw_file_perms; 1665 1666# Allow accessing /mnt/pre_reboot_dexopt/chroot, to load the new service-art.jar 1667# in Pre-reboot Dexopt. 1668allow system_server pre_reboot_dexopt_file:dir { getattr search }; 1669 1670# Allow system_server to reopen its own memfd. 1671# system_server needs to copy the new service-art.jar to a memfd and reopen it with the path 1672# /proc/self/fd/<fd> with a classloader. 1673allow system_server system_server_tmpfs:file open; 1674 1675# Allow system_server to read from postinstall scripts through STDIN, to check if the 1676# otapreopt_script is still alive. 1677allow system_server postinstall:fifo_file read; 1678 1679# Allow system_server to kill artd and its subprocesses, to make sure that no process is accessing 1680# files in chroot when we teardown chroot. 1681allow system_server { 1682 artd 1683 derive_classpath 1684 dex2oat 1685 odrefresh 1686 profman 1687}:process sigkill; 1688 1689# Do not allow any domain other than init or system server to get or set the property 1690neverallow { domain -init -system_server } crashrecovery_prop:property_service set; 1691neverallow { domain -init -dumpstate -system_server } crashrecovery_prop:file no_rw_file_perms; 1692 1693# Do not allow anything other than system_server and init to touch /metadata/tradeinmode. 1694neverallow { domain -init -system_server } tradeinmode_metadata_file:file no_rw_file_perms; 1695 1696neverallow { 1697 domain 1698 -init 1699 -vendor_init 1700 -system_server 1701 -shell 1702} power_debug_prop:property_service set; 1703