586 lines
22 KiB
Text
586 lines
22 KiB
Text
#
|
|
# System Server aka system_server spawned by zygote.
|
|
# Most of the framework services run in this process.
|
|
#
|
|
type system_server, domain, domain_deprecated, mlstrustedsubject;
|
|
|
|
# Define a type for tmpfs-backed ashmem regions.
|
|
tmpfs_domain(system_server)
|
|
|
|
# For art.
|
|
allow system_server dalvikcache_data_file:file execute;
|
|
allow system_server dalvikcache_data_file:dir r_dir_perms;
|
|
|
|
# Enable system server to check the foreign dex usage markers.
|
|
# We need search on top level directories so that we can get to the files
|
|
allow system_server user_profile_data_file:dir search;
|
|
allow system_server user_profile_data_file:file getattr;
|
|
allow system_server user_profile_foreign_dex_data_file:dir { add_name open read write search remove_name };
|
|
allow system_server user_profile_foreign_dex_data_file:file { getattr rename unlink };
|
|
|
|
# /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.
|
|
net_domain(system_server)
|
|
bluetooth_domain(system_server)
|
|
|
|
# These are the capabilities assigned by the zygote to the
|
|
# system server.
|
|
allow system_server self:capability {
|
|
ipc_lock
|
|
kill
|
|
net_admin
|
|
net_bind_service
|
|
net_broadcast
|
|
net_raw
|
|
sys_boot
|
|
sys_nice
|
|
sys_resource
|
|
sys_time
|
|
sys_tty_config
|
|
};
|
|
|
|
wakelock_use(system_server)
|
|
|
|
# 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;
|
|
|
|
# Allow alarmtimers to be set
|
|
allow system_server self:capability2 wake_alarm;
|
|
|
|
# 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;
|
|
allow system_server self:netlink_generic_socket create_socket_perms;
|
|
|
|
# Use generic "sockets" where the address family is not known
|
|
# to the kernel.
|
|
allow system_server self: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 autoplay_app }:process { sigkill signal };
|
|
|
|
# Set scheduling info for apps.
|
|
allow system_server { appdomain autoplay_app }:process { getsched setsched };
|
|
allow system_server audioserver:process { getsched setsched };
|
|
allow system_server cameraserver: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. In addition, /proc/pid files access is needed
|
|
# for dumping stack traces of native processes.
|
|
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;
|
|
|
|
# Read /proc/uid_cputime/show_uid_stat.
|
|
allow system_server proc_uid_cputime_showstat:file r_file_perms;
|
|
|
|
# Write /proc/uid_cputime/remove_uid_range.
|
|
allow system_server proc_uid_cputime_removeuid:file { w_file_perms getattr };
|
|
|
|
# Write to /proc/sysrq-trigger.
|
|
allow system_server proc_sysrq:file rw_file_perms;
|
|
|
|
# Read /proc/stat for CPU usage statistics
|
|
allow system_server proc_stat:file r_file_perms;
|
|
|
|
# Read /sys/kernel/debug/wakeup_sources.
|
|
allow system_server debugfs:file r_file_perms;
|
|
|
|
# The DhcpClient and WifiWatchdog use packet_sockets
|
|
allow system_server self:packet_socket create_socket_perms;
|
|
|
|
# NetworkDiagnostics requires explicit bind() calls to ping sockets. These aren't actually the same
|
|
# as raw sockets, but the kernel doesn't yet distinguish between the two.
|
|
allow system_server node:rawip_socket node_bind;
|
|
|
|
# 3rd party VPN clients require a tun_socket to be created
|
|
allow system_server self:tun_socket create_socket_perms;
|
|
|
|
# Talk to init and various daemons via sockets.
|
|
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, racoon, racoon)
|
|
unix_socket_send(system_server, wpa, wpa)
|
|
unix_socket_connect(system_server, uncrypt, uncrypt)
|
|
|
|
# Communicate over a socket created by surfaceflinger.
|
|
allow system_server surfaceflinger:unix_stream_socket { read write setopt };
|
|
|
|
# Perform Binder IPC.
|
|
binder_use(system_server)
|
|
binder_call(system_server, binderservicedomain)
|
|
binder_call(system_server, gatekeeperd)
|
|
binder_call(system_server, fingerprintd)
|
|
binder_call(system_server, { appdomain autoplay_app })
|
|
binder_call(system_server, dumpstate)
|
|
binder_call(system_server, netd)
|
|
binder_service(system_server)
|
|
|
|
# Ask debuggerd to dump backtraces for native stacks of interest.
|
|
#
|
|
# This is derived from the list that system server defines as interesting native processes
|
|
# to dump during ANRs or watchdog aborts, defined in NATIVE_STACKS_OF_INTEREST in
|
|
# frameworks/base/services/core/java/com/android/server/Watchdog.java.
|
|
allow system_server {
|
|
audioserver
|
|
bluetooth
|
|
cameraserver
|
|
drmserver
|
|
inputflinger
|
|
mediacodec
|
|
mediadrmserver
|
|
mediaextractor
|
|
mediaserver
|
|
sdcardd
|
|
surfaceflinger
|
|
}:debuggerd dump_backtrace;
|
|
|
|
# Use sockets received over binder from various services.
|
|
allow system_server audioserver:tcp_socket rw_socket_perms;
|
|
allow system_server audioserver:udp_socket rw_socket_perms;
|
|
allow system_server mediaserver:tcp_socket rw_socket_perms;
|
|
allow system_server mediaserver:udp_socket rw_socket_perms;
|
|
|
|
# Use sockets received over binder from various services.
|
|
allow system_server mediadrmserver:tcp_socket rw_socket_perms;
|
|
allow system_server mediadrmserver:udp_socket rw_socket_perms;
|
|
|
|
# Check SELinux permissions.
|
|
selinux_check_access(system_server)
|
|
|
|
# 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;
|
|
allow system_server sysfs_mac_address:file r_file_perms;
|
|
allow system_server sysfs_thermal:dir search;
|
|
allow system_server sysfs_thermal:file r_file_perms;
|
|
|
|
# TODO: added to match above sysfs rule. Remove me?
|
|
allow system_server sysfs_usb: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 rtc_device:chr_file rw_file_perms;
|
|
allow system_server audio_device:dir r_dir_perms;
|
|
|
|
# write access needed for MIDI
|
|
allow system_server audio_device:chr_file rw_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;
|
|
|
|
# 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 autoplay_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 com.android.providers.settings/databases/settings.db.
|
|
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 };
|
|
|
|
# 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 rename unlink };
|
|
|
|
# Backup of wallpaper imagery uses temporary hard links to avoid data churn
|
|
allow system_server { system_data_file wallpaper_file }:file link;
|
|
|
|
# ShortcutManager icons
|
|
allow system_server system_data_file:dir relabelfrom;
|
|
allow system_server shortcut_manager_icons:dir { create_dir_perms relabelto };
|
|
allow system_server shortcut_manager_icons:file create_file_perms;
|
|
|
|
# Manage ringtones.
|
|
allow system_server ringtone_file:dir { create_dir_perms relabelto };
|
|
allow system_server ringtone_file:file create_file_perms;
|
|
|
|
# Relabel icon file.
|
|
allow system_server icon_file:file relabelto;
|
|
allow system_server icon_file:file { rw_file_perms unlink };
|
|
|
|
# FingerprintService.java does a restorecon of the directory /data/system/users/[0-9]+/fpdata(/.*)?
|
|
allow system_server system_data_file:dir relabelfrom;
|
|
|
|
# Property Service write
|
|
set_prop(system_server, system_prop)
|
|
set_prop(system_server, safemode_prop)
|
|
set_prop(system_server, dhcp_prop)
|
|
set_prop(system_server, net_radio_prop)
|
|
set_prop(system_server, system_radio_prop)
|
|
set_prop(system_server, debug_prop)
|
|
set_prop(system_server, powerctl_prop)
|
|
set_prop(system_server, fingerprint_prop)
|
|
set_prop(system_server, device_logging_prop)
|
|
userdebug_or_eng(`set_prop(system_server, wifi_log_prop)')
|
|
|
|
# ctl interface
|
|
set_prop(system_server, ctl_default_prop)
|
|
set_prop(system_server, ctl_bugreport_prop)
|
|
|
|
# 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 cache_recovery_file }:dir { relabelfrom create_dir_perms };
|
|
allow system_server { cache_file cache_recovery_file }:file { relabelfrom create_file_perms };
|
|
allow system_server { cache_file cache_recovery_file }:fifo_file create_file_perms;
|
|
|
|
# Run system programs, e.g. dexopt. Needed? (b/28035297)
|
|
allow system_server system_file:file x_file_perms;
|
|
auditallow system_server system_file:file execute_no_trans;
|
|
|
|
# LocationManager(e.g, GPS) needs to read and write
|
|
# to uart driver and ctrl proc entry
|
|
allow system_server gps_control:file rw_file_perms;
|
|
|
|
# Allow system_server to use app-created sockets and pipes.
|
|
allow system_server { appdomain autoplay_app }:{ tcp_socket udp_socket } { getattr getopt setopt read write shutdown };
|
|
allow system_server { appdomain autoplay_app }:{ fifo_file unix_stream_socket } { getattr read write };
|
|
|
|
# Allow abstract socket connection
|
|
allow system_server rild:unix_stream_socket connectto;
|
|
|
|
# BackupManagerService needs to manipulate backup data files
|
|
allow system_server cache_backup_file:dir rw_dir_perms;
|
|
allow system_server cache_backup_file:file create_file_perms;
|
|
# LocalTransport works inside /cache/backup
|
|
allow system_server cache_private_backup_file:dir create_dir_perms;
|
|
allow system_server cache_private_backup_file:file create_file_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;
|
|
|
|
# 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.
|
|
read_logd(system_server)
|
|
|
|
# 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;
|
|
|
|
# /sys access
|
|
allow system_server sysfs_zram:dir search;
|
|
allow system_server sysfs_zram:file r_file_perms;
|
|
|
|
allow system_server audioserver_service:service_manager find;
|
|
allow system_server cameraserver_service:service_manager find;
|
|
allow system_server drmserver_service:service_manager find;
|
|
allow system_server batteryproperties_service:service_manager find;
|
|
allow system_server keystore_service:service_manager find;
|
|
allow system_server gatekeeper_service:service_manager find;
|
|
allow system_server fingerprintd_service:service_manager find;
|
|
allow system_server mediaserver_service:service_manager find;
|
|
allow system_server mediaextractor_service:service_manager find;
|
|
allow system_server mediacodec_service:service_manager find;
|
|
allow system_server mediadrmserver_service:service_manager find;
|
|
allow system_server netd_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 keystore:keystore_key {
|
|
get_state
|
|
get
|
|
insert
|
|
delete
|
|
exist
|
|
list
|
|
reset
|
|
password
|
|
lock
|
|
unlock
|
|
is_empty
|
|
sign
|
|
verify
|
|
grant
|
|
duplicate
|
|
clear_uid
|
|
add_auth
|
|
user_changed
|
|
};
|
|
|
|
# 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;
|
|
|
|
# Allow system process to relabel the fingerprint directory after mkdir
|
|
# and delete the directory and files when no longer needed
|
|
allow system_server fingerprintd_data_file:dir { r_dir_perms remove_name rmdir relabelto write };
|
|
allow system_server fingerprintd_data_file:file { getattr unlink };
|
|
|
|
# Allow system process to read network MAC address
|
|
allow system_server sysfs_mac_address:file r_file_perms;
|
|
|
|
userdebug_or_eng(`
|
|
# Allow system server to create and write method traces in /data/misc/trace.
|
|
allow system_server method_trace_data_file:dir w_dir_perms;
|
|
allow system_server method_trace_data_file:file { create w_file_perms };
|
|
|
|
# Allow system server to read dmesg
|
|
allow system_server kernel:system syslog_read;
|
|
')
|
|
|
|
# For AppFuse.
|
|
allow system_server vold:fd use;
|
|
allow system_server fuse_device:chr_file { read write ioctl getattr };
|
|
|
|
# For configuring sdcardfs
|
|
allow system_server configfs:dir { create_dir_perms };
|
|
allow system_server configfs:file { getattr open unlink write };
|
|
|
|
# Connect to adbd and use a socket transferred from it.
|
|
# Used for e.g. jdwp.
|
|
allow system_server adbd:unix_stream_socket connectto;
|
|
allow system_server adbd:fd use;
|
|
allow system_server adbd:unix_stream_socket { getattr getopt ioctl read write shutdown };
|
|
|
|
# Access to /data/media.
|
|
# This should be removed if sdcardfs is modified to alter the secontext for its
|
|
# accesses to the underlying FS.
|
|
allow system_server media_rw_data_file:dir search;
|
|
|
|
# Allow invoking tools like "timeout"
|
|
allow system_server toolbox_exec:file rx_file_perms;
|
|
|
|
# Postinstall
|
|
#
|
|
# For OTA dexopt, allow calls coming from postinstall.
|
|
binder_call(system_server, postinstall)
|
|
|
|
allow system_server postinstall:fifo_file write;
|
|
allow system_server update_engine:fd use;
|
|
allow system_server update_engine:fifo_file write;
|
|
|
|
# Access to /data/preloads
|
|
allow system_server preloads_data_file:file { r_file_perms unlink };
|
|
allow system_server preloads_data_file:dir { r_dir_perms write remove_name };
|
|
|
|
###
|
|
### 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 operating on 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 create unlink link };
|
|
|
|
# Forking and execing is inherently dangerous and racy. See, for
|
|
# example, https://www.linuxprogrammingblog.com/threads-and-fork-think-twice-before-using-them
|
|
# Prevent the addition of new file execs to stop the problem from
|
|
# getting worse. b/28035297
|
|
neverallow system_server { file_type -toolbox_exec -logcat_exec -system_file }:file execute_no_trans;
|
|
|
|
# System server should never transition to a new domain. This compliments
|
|
# and enforces the already pre-existing PR_SET_NO_NEW_PRIVS flag.
|
|
neverallow system_server *:process { transition dyntransition };
|
|
|
|
# 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;
|
|
|
|
# system_server should never execute or load executable shared libraries
|
|
# in /data except for /data/dalvik-cache files.
|
|
neverallow system_server {
|
|
data_file_type
|
|
-dalvikcache_data_file #mapping with PROT_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;
|
|
|
|
# system_server should never use JIT functionality
|
|
neverallow system_server self:process execmem;
|
|
neverallow system_server ashmem_device:chr_file execute;
|
|
neverallow system_server system_server_tmpfs:file execute;
|