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# System Server aka system_server spawned by zygote.
# Most of the framework services run in this process.
type system_server, domain, mlstrustedsubject;
# Define a type for tmpfs-backed ashmem regions.
# Dalvik Compiler JIT Mapping.
allow system_server self:process execmem;
allow system_server ashmem_device:chr_file execute;
allow system_server system_server_tmpfs:file execute;
# For art.
allow system_server dalvikcache_data_file:file execute;
allow system_server dalvikcache_data_file:dir r_dir_perms;
# /data/resource-cache
allow system_server resourcecache_data_file:file r_file_perms;
allow system_server resourcecache_data_file:dir r_dir_perms;
# ptrace to processes in the same domain for debugging crashes.
allow system_server self:process ptrace;
# Child of the zygote.
allow system_server zygote:fd use;
allow system_server zygote:process sigchld;
allow system_server zygote_tmpfs:file read;
# May kill zygote on crashes.
allow system_server zygote:process sigkill;
# Read /system/bin/app_process.
allow system_server zygote_exec:file r_file_perms;
# Needed to close the zygote socket, which involves getopt / getattr
allow system_server zygote:unix_stream_socket { getopt getattr };
# system server gets network and bluetooth permissions.
# These are the capabilities assigned by the zygote to the
# system server.
allow system_server self:capability {
# Triggered by /proc/pid accesses, not allowed.
dontaudit system_server self:capability sys_ptrace;
# Trigger module auto-load.
allow system_server kernel:system module_request;
# Use netlink uevent sockets.
allow system_server self:netlink_kobject_uevent_socket create_socket_perms;
# Use generic netlink sockets.
allow system_server self:netlink_socket create_socket_perms;
# Set and get routes directly via netlink.
allow system_server self:netlink_route_socket nlmsg_write;
# Kill apps.
allow system_server appdomain:process { sigkill signal };
# Set scheduling info for apps.
allow system_server appdomain:process { getsched setsched };
allow system_server mediaserver:process { getsched setsched };
# Read /proc/pid data for all domains. This is used by ProcessCpuTracker
# within system_server to keep track of memory and CPU usage for
# all processes on the device.
r_dir_file(system_server, domain)
# Read/Write to /proc/net/xt_qtaguid/ctrl and and /dev/xt_qtaguid.
allow system_server qtaguid_proc:file rw_file_perms;
allow system_server qtaguid_device:chr_file rw_file_perms;
# Write to /proc/sysrq-trigger.
allow system_server proc_sysrq:file rw_file_perms;
# Read /sys/kernel/debug/wakeup_sources.
allow system_server debugfs:file r_file_perms;
# WifiWatchdog uses a packet_socket
allow system_server self:packet_socket create_socket_perms;
# 3rd party VPN clients require a tun_socket to be created
allow system_server self:tun_socket create_socket_perms;
# Notify init of death.
allow system_server init:process sigchld;
# Talk to init and various daemons via sockets.
unix_socket_connect(system_server, property, init)
unix_socket_connect(system_server, installd, installd)
unix_socket_connect(system_server, lmkd, lmkd)
unix_socket_connect(system_server, mtpd, mtp)
unix_socket_connect(system_server, netd, netd)
unix_socket_connect(system_server, vold, vold)
unix_socket_connect(system_server, zygote, zygote)
unix_socket_connect(system_server, gps, gpsd)
unix_socket_connect(system_server, racoon, racoon)
unix_socket_send(system_server, wpa, wpa)
# Communicate over a socket created by surfaceflinger.
allow system_server surfaceflinger:unix_stream_socket { read write setopt };
# Perform Binder IPC.
binder_call(system_server, binderservicedomain)
binder_call(system_server, appdomain)
binder_call(system_server, dumpstate)
# Ask debuggerd to dump backtraces for native stacks of interest.
allow system_server { mediaserver sdcardd surfaceflinger inputflinger }:debuggerd dump_backtrace;
# Read /proc/pid files for dumping stack traces of native processes.
r_dir_file(system_server, mediaserver)
r_dir_file(system_server, sdcardd)
r_dir_file(system_server, surfaceflinger)
r_dir_file(system_server, inputflinger)
# Use sockets received over binder from various services.
allow system_server mediaserver:tcp_socket rw_socket_perms;
allow system_server mediaserver:udp_socket rw_socket_perms;
# Check SELinux permissions.
# XXX Label sysfs files with a specific type?
allow system_server sysfs:file rw_file_perms;
allow system_server sysfs_nfc_power_writable:file rw_file_perms;
allow system_server sysfs_devices_system_cpu:file w_file_perms;
# Access devices.
allow system_server device:dir r_dir_perms;
allow system_server mdns_socket:sock_file rw_file_perms;
allow system_server alarm_device:chr_file rw_file_perms;
allow system_server gpu_device:chr_file rw_file_perms;
allow system_server iio_device:chr_file rw_file_perms;
allow system_server input_device:dir r_dir_perms;
allow system_server input_device:chr_file rw_file_perms;
allow system_server radio_device:chr_file r_file_perms;
allow system_server tty_device:chr_file rw_file_perms;
allow system_server usbaccessory_device:chr_file rw_file_perms;
allow system_server video_device:dir r_dir_perms;
allow system_server video_device:chr_file rw_file_perms;
allow system_server adbd_socket:sock_file rw_file_perms;
allow system_server audio_device:dir r_dir_perms;
allow system_server audio_device:chr_file r_file_perms;
# tun device used for 3rd party vpn apps
allow system_server tun_device:chr_file rw_file_perms;
# Manage system data files.
allow system_server system_data_file:dir create_dir_perms;
allow system_server system_data_file:notdevfile_class_set create_file_perms;
allow system_server keychain_data_file:dir create_dir_perms;
allow system_server keychain_data_file:file create_file_perms;
# Manage /data/app.
allow system_server apk_data_file:dir create_dir_perms;
allow system_server apk_data_file:file { create_file_perms link };
allow system_server apk_tmp_file:dir create_dir_perms;
allow system_server apk_tmp_file:file create_file_perms;
# Manage /data/app-private.
allow system_server apk_private_data_file:dir create_dir_perms;
allow system_server apk_private_data_file:file create_file_perms;
allow system_server apk_private_tmp_file:dir create_dir_perms;
allow system_server apk_private_tmp_file:file create_file_perms;
# Manage files within asec containers.
allow system_server asec_apk_file:dir create_dir_perms;
allow system_server asec_apk_file:file create_file_perms;
allow system_server asec_public_file:file create_file_perms;
# Manage /data/anr.
allow system_server anr_data_file:dir create_dir_perms;
allow system_server anr_data_file:file create_file_perms;
# Manage /data/backup.
allow system_server backup_data_file:dir create_dir_perms;
allow system_server backup_data_file:file create_file_perms;
# Read from /data/dalvik-cache/profiles
allow system_server dalvikcache_profiles_data_file:dir rw_dir_perms;
allow system_server dalvikcache_profiles_data_file:file create_file_perms;
# Write to /data/system/heapdump
allow system_server heapdump_data_file:dir rw_dir_perms;
allow system_server heapdump_data_file:file create_file_perms;
# Manage /data/misc/adb.
allow system_server adb_keys_file:dir create_dir_perms;
allow system_server adb_keys_file:file create_file_perms;
# Manage /data/misc/sms.
# TODO: Split into a separate type?
allow system_server radio_data_file:dir create_dir_perms;
allow system_server radio_data_file:file create_file_perms;
# Manage /data/misc/systemkeys.
allow system_server systemkeys_data_file:dir create_dir_perms;
allow system_server systemkeys_data_file:file create_file_perms;
# Access /data/tombstones.
allow system_server tombstone_data_file:dir r_dir_perms;
allow system_server tombstone_data_file:file r_file_perms;
# Manage /data/misc/vpn.
allow system_server vpn_data_file:dir create_dir_perms;
allow system_server vpn_data_file:file create_file_perms;
# Manage /data/misc/wifi.
allow system_server wifi_data_file:dir create_dir_perms;
allow system_server wifi_data_file:file create_file_perms;
# Manage /data/misc/zoneinfo.
allow system_server zoneinfo_data_file:dir create_dir_perms;
allow system_server zoneinfo_data_file:file create_file_perms;
# Walk /data/data subdirectories.
# Types extracted from seapp_contexts type= fields.
allow system_server { system_app_data_file bluetooth_data_file nfc_data_file radio_data_file shell_data_file app_data_file }:dir { getattr read search };
# Also permit for unlabeled /data/data subdirectories and
# for unlabeled asec containers on upgrades from 4.2.
allow system_server unlabeled:dir r_dir_perms;
# Read pkg.apk file before it has been relabeled by vold.
allow system_server unlabeled:file r_file_perms;
# Populate
allow system_server system_app_data_file:dir create_dir_perms;
allow system_server system_app_data_file:file create_file_perms;
# Receive and use open app data files passed over binder IPC.
# Types extracted from seapp_contexts type= fields.
allow system_server { system_app_data_file bluetooth_data_file nfc_data_file radio_data_file shell_data_file app_data_file }:file { getattr read write };
# Receive and use open /data/media files passed over binder IPC.
allow system_server media_rw_data_file:file { getattr read write };
# Read /file_contexts and /data/security/file_contexts
# Relabel apk files.
allow system_server { apk_tmp_file apk_private_tmp_file }:{ dir file } { relabelfrom relabelto };
allow system_server { apk_data_file apk_private_data_file }:{ dir file } { relabelfrom relabelto };
# Relabel wallpaper.
allow system_server system_data_file:file relabelfrom;
allow system_server wallpaper_file:file relabelto;
allow system_server wallpaper_file:file { rw_file_perms unlink };
# Relabel /data/anr.
allow system_server system_data_file:dir relabelfrom;
allow system_server anr_data_file:dir relabelto;
# Property Service write
allow system_server system_prop:property_service set;
allow system_server dhcp_prop:property_service set;
allow system_server net_radio_prop:property_service set;
allow system_server system_radio_prop:property_service set;
allow system_server debug_prop:property_service set;
allow system_server powerctl_prop:property_service set;
allow system_server fingerprint_prop:property_service set;
# ctl interface
allow system_server ctl_default_prop:property_service set;
allow system_server ctl_dhcp_pan_prop:property_service set;
allow system_server ctl_bugreport_prop:property_service set;
# Create a socket for receiving info from wpa.
type_transition system_server wifi_data_file:sock_file system_wpa_socket;
type_transition system_server wpa_socket:sock_file system_wpa_socket;
allow system_server wpa_socket:dir rw_dir_perms;
allow system_server system_wpa_socket:sock_file create_file_perms;
# Remove sockets created by wpa_supplicant
allow system_server wpa_socket:sock_file unlink;
# Create a socket for connections from debuggerd.
type_transition system_server system_data_file:sock_file system_ndebug_socket "ndebugsocket";
allow system_server system_ndebug_socket:sock_file create_file_perms;
# Manage cache files.
allow system_server cache_file:dir { relabelfrom create_dir_perms };
allow system_server cache_file:file { relabelfrom create_file_perms };
# Run system programs, e.g. dexopt.
allow system_server system_file:file x_file_perms;
# LocationManager(e.g, GPS) needs to read and write
# to uart driver and ctrl proc entry
allow system_server gps_device:chr_file rw_file_perms;
allow system_server gps_control:file rw_file_perms;
# Allow system_server to use app-created sockets and pipes.
allow system_server appdomain:{ tcp_socket udp_socket } { getattr getopt setopt read write shutdown };
allow system_server appdomain:{ fifo_file unix_stream_socket } { getattr read write };
# Allow abstract socket connection
allow system_server rild:unix_stream_socket connectto;
# BackupManagerService lets PMS create a data backup file
allow system_server cache_backup_file:file create_file_perms;
# Relabel /data/backup
allow system_server backup_data_file:dir { relabelto relabelfrom };
# Relabel /cache/.*\.{data|restore}
allow system_server cache_backup_file:file { relabelto relabelfrom };
# LocalTransport creates and relabels /cache/backup
allow system_server cache_backup_file:dir { relabelto relabelfrom create_dir_perms };
# Allow system to talk to usb device
allow system_server usb_device:chr_file rw_file_perms;
allow system_server usb_device:dir r_dir_perms;
# Allow system to talk to sensors
allow system_server sensors_device:chr_file rw_file_perms;
# Read from HW RNG (needed by EntropyMixer).
allow system_server hw_random_device:chr_file r_file_perms;
# Read and delete files under /dev/fscklogs.
r_dir_file(system_server, fscklogs)
allow system_server fscklogs:dir { write remove_name };
allow system_server fscklogs:file unlink;
# For SELinuxPolicyInstallReceiver
# logd access, system_server inherit logd write socket
# (urge is to deprecate this long term)
allow system_server zygote:unix_dgram_socket write;
# Read from log daemon.
# Be consistent with DAC permissions. Allow system_server to write to
# /sys/module/lowmemorykiller/parameters/adj
# /sys/module/lowmemorykiller/parameters/minfree
allow system_server sysfs_lowmemorykiller:file { getattr w_file_perms };
# Read /sys/fs/pstore/console-ramoops
# Don't worry about overly broad permissions for now, as there's
# only one file in /sys/fs/pstore
allow system_server pstorefs:dir r_dir_perms;
allow system_server pstorefs:file r_file_perms;
allow system_server drmserver_service:service_manager find;
allow system_server healthd_service:service_manager find;
allow system_server keystore_service:service_manager find;
allow system_server gatekeeper_service:service_manager find;
allow system_server mediaserver_service:service_manager find;
allow system_server nfc_service:service_manager find;
allow system_server radio_service:service_manager find;
allow system_server system_server_service:service_manager { add find };
allow system_server surfaceflinger_service:service_manager find;
allow system_server tmp_system_server_service:service_manager { add find };
auditallow system_server {
}:service_manager find;
allow system_server keystore:keystore_key {
# Allow system server to search and write to the persistent factory reset
# protection partition. This block device does not get wiped in a factory reset.
allow system_server block_device:dir search;
allow system_server frp_block_device:blk_file rw_file_perms;
# Clean up old cgroups
allow system_server cgroup:dir { remove_name rmdir };
# /oem access
r_dir_file(system_server, oemfs)
# Allow resolving per-user storage symlinks
allow system_server { mnt_user_file storage_file }:dir { getattr search };
allow system_server { mnt_user_file storage_file }:lnk_file { getattr read };
# Allow statfs() on storage devices, which happens fast enough that
# we shouldn't be killed during unsafe removal
allow system_server sdcard_type:dir { getattr search };
# Traverse into expanded storage
allow system_server mnt_expand_file:dir r_dir_perms;
### Neverallow rules
### system_server should NEVER do any of this
# Do not allow opening files from external storage as unsafe ejection
# could cause the kernel to kill the system_server.
neverallow system_server sdcard_type:dir { open read write };
neverallow system_server sdcard_type:file rw_file_perms;
# system server should never be opening zygote spawned app data
# files directly. Rather, they should always be passed via a
# file descriptor.
# Types extracted from seapp_contexts type= fields, excluding
# those types that system_server needs to open directly.
neverallow system_server { bluetooth_data_file nfc_data_file shell_data_file app_data_file }:file open;
# system_server should never be executing dex2oat. This is either
# a bug (for example, bug 16317188), or represents an attempt by
# system server to dynamically load a dex file, something we do not
# want to allow.
neverallow system_server dex2oat_exec:file no_x_file_perms;
# The only block device system_server should be accessing is
# the frp_block_device. This helps avoid a system_server to root
# escalation by writing to raw block devices.
neverallow system_server { dev_type -frp_block_device }:blk_file no_rw_file_perms;