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 and write /data/data subdirectory. 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, arm64_memtag_prop) 38set_prop(system_app, bluetooth_a2dp_offload_prop) 39set_prop(system_app, bluetooth_audio_hal_prop) 40set_prop(system_app, bluetooth_prop) 41set_prop(system_app, debug_prop) 42set_prop(system_app, system_prop) 43set_prop(system_app, exported_bluetooth_prop) 44set_prop(system_app, exported_system_prop) 45set_prop(system_app, exported3_system_prop) 46set_prop(system_app, logd_prop) 47set_prop(system_app, net_radio_prop) 48set_prop(system_app, usb_control_prop) 49set_prop(system_app, usb_prop) 50set_prop(system_app, log_tag_prop) 51userdebug_or_eng(`set_prop(system_app, logpersistd_logging_prop)') 52auditallow system_app net_radio_prop:property_service set; 53auditallow system_app usb_control_prop:property_service set; 54auditallow system_app usb_prop:property_service set; 55# Allow Settings to enable Dynamic System Update 56set_prop(system_app, dynamic_system_prop) 57 58# ctl interface 59set_prop(system_app, ctl_default_prop) 60set_prop(system_app, ctl_bugreport_prop) 61 62# Allow developer settings to query gsid status 63get_prop(system_app, gsid_prop) 64 65# Create /data/anr/traces.txt. 66allow system_app anr_data_file:dir ra_dir_perms; 67allow system_app anr_data_file:file create_file_perms; 68 69# Settings need to access app name and icon from asec 70allow system_app asec_apk_file:file r_file_perms; 71 72# Allow system apps (like Settings) to interact with statsd 73binder_call(system_app, statsd) 74 75# Allow system apps to interact with incidentd 76binder_call(system_app, incidentd) 77 78# Allow system app to interact with Dumpstate HAL 79hal_client_domain(system_app, hal_dumpstate) 80 81allow system_app servicemanager:service_manager list; 82# TODO: scope this down? Too broad? 83allow system_app { 84 service_manager_type 85 -apex_service 86 -dnsresolver_service 87 -dumpstate_service 88 -installd_service 89 -iorapd_service 90 -lpdump_service 91 -netd_service 92 -system_suspend_control_internal_service 93 -system_suspend_control_service 94 -tracingproxy_service 95 -virtual_touchpad_service 96 -vold_service 97 -vr_hwc_service 98 -default_android_service 99}:service_manager find; 100# suppress denials for services system_app should not be accessing. 101dontaudit system_app { 102 dnsresolver_service 103 dumpstate_service 104 installd_service 105 iorapd_service 106 netd_service 107 virtual_touchpad_service 108 vold_service 109 vr_hwc_service 110}:service_manager find; 111 112# suppress denials caused by debugfs_tracing 113dontaudit system_app debugfs_tracing:file rw_file_perms; 114 115allow system_app keystore:keystore_key { 116 get_state 117 get 118 insert 119 delete 120 exist 121 list 122 reset 123 password 124 lock 125 unlock 126 is_empty 127 sign 128 verify 129 grant 130 duplicate 131 clear_uid 132 user_changed 133}; 134 135allow system_app keystore:keystore2_key { 136 delete 137 get_info 138 grant 139 rebind 140 update 141 use 142}; 143 144# Allow Settings to manage WI-FI keys. 145allow system_app wifi_key:keystore2_key { 146 delete 147 get_info 148 rebind 149 update 150 use 151}; 152 153# settings app reads /proc/version 154allow system_app { 155 proc_version 156}:file r_file_perms; 157 158# Settings app writes to /dev/stune/foreground/tasks. 159allow system_app cgroup:file w_file_perms; 160allow system_app cgroup_v2:file w_file_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# Settings app reads ro.oem_unlock_supported 172get_prop(system_app, oem_unlock_prop) 173 174# Allow system apps to act as Perfetto producers. 175perfetto_producer(system_app) 176 177### 178### Neverallow rules 179### 180 181# app domains which access /dev/fuse should not run as system_app 182neverallow system_app fuse_device:chr_file *; 183 184# Apps which run as UID=system should not rely on any attacker controlled 185# filesystem locations, such as /data/local/tmp. For /data/local/tmp, we 186# allow writes to files passed by file descriptor to support dumpstate and 187# bug reports, but not reads. 188neverallow system_app shell_data_file:dir { no_w_dir_perms open search read }; 189neverallow system_app shell_data_file:file { open read ioctl lock }; 190