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# ctl interface 64set_prop(system_app, ctl_default_prop) 65set_prop(system_app, ctl_bugreport_prop) 66 67# Allow developer settings to query gsid status 68get_prop(system_app, gsid_prop) 69 70# Allow developer settings to check 16k pages boot option status 71get_prop(system_app, enable_16k_pages_prop) 72 73# Allow developer settings to check virtualization capabilities 74get_prop(system_app, hypervisor_prop) 75 76# Create /data/anr/traces.txt. 77allow system_app anr_data_file:dir ra_dir_perms; 78allow system_app anr_data_file:file create_file_perms; 79 80# Settings need to access app name and icon from asec 81allow system_app asec_apk_file:file r_file_perms; 82 83# Allow system apps (like Settings) to interact with statsd 84binder_call(system_app, statsd) 85 86# Allow system apps to interact with incidentd 87binder_call(system_app, incidentd) 88 89# Allow system apps (Settings) to call into update_engine 90# in order to apply update to switch from 4k kernel to 16K and vice-versa 91binder_use(system_app) 92allow system_app update_engine_stable_service:service_manager find; 93binder_call(system_app, update_engine) 94 95# Allow system app to interact with Dumpstate HAL 96hal_client_domain(system_app, hal_dumpstate) 97 98allow system_app servicemanager:service_manager list; 99# TODO: scope this down? Too broad? 100allow system_app { 101 service_manager_type 102 -apex_service 103 -dnsresolver_service 104 -dumpstate_service 105 -installd_service 106 -lpdump_service 107 -mdns_service 108 -netd_service 109 -system_suspend_control_internal_service 110 -system_suspend_control_service 111 -tracingproxy_service 112 -virtual_touchpad_service 113 -vold_service 114 -default_android_service 115}:service_manager find; 116# suppress denials for services system_app should not be accessing. 117dontaudit system_app { 118 dnsresolver_service 119 dumpstate_service 120 installd_service 121 mdns_service 122 netd_service 123 virtual_touchpad_service 124 vold_service 125}:service_manager find; 126 127# suppress denials caused by debugfs_tracing 128dontaudit system_app debugfs_tracing:file rw_file_perms; 129 130# Ignore access to memory properties for Settings. 131dontaudit system_app proc_pagetypeinfo:file r_file_perms; 132dontaudit system_app sysfs_zram:dir search; 133 134allow system_app keystore:keystore2_key { 135 delete 136 get_info 137 grant 138 rebind 139 update 140 use 141}; 142 143# Allow Settings to manage WI-FI keys. 144allow system_app wifi_key:keystore2_key { 145 delete 146 get_info 147 rebind 148 update 149 use 150}; 151 152# settings app reads /proc/version 153allow system_app { 154 proc_version 155}:file r_file_perms; 156 157# Allow system apps to modify cgroup attributes and migrate processes 158allow system_app cgroup:file w_file_perms; 159allow system_app cgroup_v2:file w_file_perms; 160allow system_app cgroup_v2:dir w_dir_perms; 161 162control_logd(system_app) 163read_runtime_log_tags(system_app) 164get_prop(system_app, device_logging_prop) 165 166# allow system apps to use UDP sockets provided by the system server but not 167# modify them other than to connect 168allow system_app system_server:udp_socket { 169 connect getattr read recvfrom sendto write getopt setopt }; 170 171# allow system apps to read game manager related sysrops 172get_prop(system_app, game_manager_config_prop) 173 174# Settings app reads ro.oem_unlock_supported 175get_prop(system_app, oem_unlock_prop) 176 177# Settings app reads ro.usb.uvc.enabled 178get_prop(system_app, usb_uvc_enabled_prop) 179 180# Settings app reads and writes the wifi blob database 181allow system_app connectivityblob_data_file:dir rw_dir_perms; 182allow system_app connectivityblob_data_file:file create_file_perms; 183 184### 185### Neverallow rules 186### 187 188# app domains which access /dev/fuse should not run as system_app 189neverallow system_app fuse_device:chr_file *; 190 191# Apps which run as UID=system should not rely on any attacker controlled 192# filesystem locations, such as /data/local/tmp. For /data/local/tmp, we 193# allow writes to files passed by file descriptor to support dumpstate and 194# bug reports, but not reads. 195neverallow system_app shell_data_file:dir { no_w_dir_perms open search read }; 196neverallow system_app shell_data_file:file { open read ioctl lock }; 197 198# system_app should be the only domain writing the adaptive haptics prop 199neverallow { domain -init -system_app } adaptive_haptics_prop:property_service set; 200# system_app should be the only domain writing the force l3 prop 201neverallow { domain -init -system_app } drm_forcel3_prop:property_service set; 202 203allow system_app vendor_boot_ota_file:dir { r_dir_perms }; 204allow system_app vendor_boot_ota_file:file { r_file_perms }; 205 206# allow system_app to read system_dlkm_file for /system_dlkm/etc/NOTICE.xml.gz 207allow system_app system_dlkm_file:dir search; 208allow system_app system_dlkm_file:file { getattr open read }; 209