1### 2### Apps that run with the system UID, e.g. com.android.system.ui, 3### com.android.settings. These are not as privileged as the system 4### server. 5### 6 7typeattribute system_app coredomain, mlstrustedsubject; 8 9app_domain(system_app) 10net_domain(system_app) 11binder_service(system_app) 12 13# android.ui and system.ui 14allow system_app rootfs:dir getattr; 15 16# read/write certain subdirectories of /data/data for system UID apps. 17allow system_app system_app_data_file:dir create_dir_perms; 18allow system_app system_app_data_file:{ file lnk_file } create_file_perms; 19 20# Read and write to /data/misc/user. 21allow system_app misc_user_data_file:dir create_dir_perms; 22allow system_app misc_user_data_file:file create_file_perms; 23 24# Access to apex files stored on /data (b/136063500) 25# Needed so that Settings can access NOTICE files inside apex 26# files located in the assets/ directory. 27allow system_app apex_data_file:dir search; 28allow system_app staging_data_file:file r_file_perms; 29 30# Read wallpaper file. 31allow system_app wallpaper_file:file r_file_perms; 32 33# Read icon file. 34allow system_app icon_file:file r_file_perms; 35 36# Write to properties 37set_prop(system_app, adaptive_haptics_prop) 38set_prop(system_app, arm64_memtag_prop) 39set_prop(system_app, bluetooth_a2dp_offload_prop) 40set_prop(system_app, bluetooth_audio_hal_prop) 41set_prop(system_app, bluetooth_prop) 42set_prop(system_app, debug_prop) 43set_prop(system_app, system_prop) 44set_prop(system_app, exported_bluetooth_prop) 45set_prop(system_app, exported_system_prop) 46set_prop(system_app, exported3_system_prop) 47set_prop(system_app, gesture_prop) 48set_prop(system_app, locale_prop) 49set_prop(system_app, logd_prop) 50set_prop(system_app, net_radio_prop) 51set_prop(system_app, timezone_prop) 52set_prop(system_app, usb_control_prop) 53set_prop(system_app, usb_prop) 54set_prop(system_app, log_tag_prop) 55set_prop(system_app, drm_forcel3_prop) 56userdebug_or_eng(`set_prop(system_app, logpersistd_logging_prop)') 57auditallow system_app net_radio_prop:property_service set; 58auditallow system_app usb_control_prop:property_service set; 59auditallow system_app usb_prop:property_service set; 60# Allow Settings to enable Dynamic System Update 61set_prop(system_app, dynamic_system_prop) 62 63# Allow Settings to access le audio mode property 64set_prop(system_app, bluetooth_lea_mode_prop) 65 66# ctl interface 67set_prop(system_app, ctl_default_prop) 68set_prop(system_app, ctl_bugreport_prop) 69 70# Allow developer settings to query gsid status 71get_prop(system_app, gsid_prop) 72 73# Allow developer settings to check 16k pages boot option status 74get_prop(system_app, enable_16k_pages_prop) 75 76# Allow developer settings to check virtualization capabilities 77get_prop(system_app, hypervisor_prop) 78 79# Create /data/anr/traces.txt. 80allow system_app anr_data_file:dir ra_dir_perms; 81allow system_app anr_data_file:file create_file_perms; 82 83# Settings need to access app name and icon from asec 84allow system_app asec_apk_file:file r_file_perms; 85 86# Allow system apps (like Settings) to interact with statsd 87binder_call(system_app, statsd) 88 89# Allow system apps to interact with incidentd 90binder_call(system_app, incidentd) 91 92# Allow system apps (Settings) to call into update_engine 93# in order to apply update to switch from 4k kernel to 16K and vice-versa 94binder_use(system_app) 95allow system_app update_engine_stable_service:service_manager find; 96binder_call(system_app, update_engine) 97 98# Allow system app to interact with Dumpstate HAL 99hal_client_domain(system_app, hal_dumpstate) 100 101allow system_app servicemanager:service_manager list; 102# TODO: scope this down? Too broad? 103allow system_app { 104 service_manager_type 105 -apex_service 106 -dnsresolver_service 107 -dumpstate_service 108 -installd_service 109 -lpdump_service 110 -mdns_service 111 -netd_service 112 -system_suspend_control_internal_service 113 -system_suspend_control_service 114 -tracingproxy_service 115 -virtual_touchpad_service 116 -vold_service 117 -default_android_service 118}:service_manager find; 119# suppress denials for services system_app should not be accessing. 120dontaudit system_app { 121 dnsresolver_service 122 dumpstate_service 123 installd_service 124 mdns_service 125 netd_service 126 virtual_touchpad_service 127 vold_service 128}:service_manager find; 129 130# suppress denials caused by debugfs_tracing 131dontaudit system_app debugfs_tracing:file rw_file_perms; 132 133# Ignore access to memory properties for Settings. 134dontaudit system_app proc_pagetypeinfo:file r_file_perms; 135dontaudit system_app sysfs_zram:dir search; 136 137allow system_app keystore:keystore2_key { 138 delete 139 get_info 140 grant 141 rebind 142 update 143 use 144}; 145 146# Allow Settings to manage WI-FI keys. 147allow system_app wifi_key:keystore2_key { 148 delete 149 get_info 150 rebind 151 update 152 use 153}; 154 155# settings app reads /proc/version 156allow system_app { 157 proc_version 158}:file r_file_perms; 159 160# Allow system apps to modify cgroup attributes and migrate processes 161allow system_app cgroup:file w_file_perms; 162allow system_app cgroup_v2:file w_file_perms; 163allow system_app cgroup_v2:dir w_dir_perms; 164 165control_logd(system_app) 166read_runtime_log_tags(system_app) 167get_prop(system_app, device_logging_prop) 168 169# allow system apps to use UDP sockets provided by the system server but not 170# modify them other than to connect 171allow system_app system_server:udp_socket { 172 connect getattr read recvfrom sendto write getopt setopt }; 173 174# allow system apps to read game manager related sysrops 175get_prop(system_app, game_manager_config_prop) 176 177# Settings app reads ro.oem_unlock_supported 178get_prop(system_app, oem_unlock_prop) 179 180# Settings app reads ro.usb.uvc.enabled 181get_prop(system_app, usb_uvc_enabled_prop) 182 183# Settings app reads and writes the wifi blob database 184allow system_app connectivityblob_data_file:dir rw_dir_perms; 185allow system_app connectivityblob_data_file:file create_file_perms; 186 187### 188### Neverallow rules 189### 190 191# app domains which access /dev/fuse should not run as system_app 192neverallow system_app fuse_device:chr_file *; 193 194# Apps which run as UID=system should not rely on any attacker controlled 195# filesystem locations, such as /data/local/tmp. For /data/local/tmp, we 196# allow writes to files passed by file descriptor to support dumpstate and 197# bug reports, but not reads. 198neverallow system_app shell_data_file:dir { no_w_dir_perms open search read }; 199neverallow system_app shell_data_file:file { open read ioctl lock }; 200 201# system_app should be the only domain writing the adaptive haptics prop 202neverallow { domain -init -system_app } adaptive_haptics_prop:property_service set; 203# system_app should be the only domain writing the force l3 prop 204neverallow { domain -init -system_app } drm_forcel3_prop:property_service set; 205 206allow system_app vendor_boot_ota_file:dir { r_dir_perms }; 207allow system_app vendor_boot_ota_file:file { r_file_perms }; 208 209# allow system_app to read system_dlkm_file for /system_dlkm/etc/NOTICE.xml.gz 210allow system_app system_dlkm_file:dir search; 211allow system_app system_dlkm_file:file { getattr open read }; 212