80dfa06984
IncFS in S adds a bunch of new ioctls, and requires the users to read its features in sysfs directory. This change adds all the features, maps them into the processes that need to call into them, and allows any incfs user to query the features Bug: 170231230 Test: incremental unit tests Change-Id: Ieea6dca38ae9829230bc17d0c73f50c93c407d35
243 lines
9.5 KiB
Text
243 lines
9.5 KiB
Text
###
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### A domain for further sandboxing privileged apps.
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###
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typeattribute priv_app coredomain;
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app_domain(priv_app)
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# Access the network.
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net_domain(priv_app)
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# Access bluetooth.
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bluetooth_domain(priv_app)
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# Allow the allocation and use of ptys
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# Used by: https://play.privileged.com/store/apps/details?id=jackpal.androidterm
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create_pty(priv_app)
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# Allow loading executable code from writable priv-app home
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# directories. This is a W^X violation, however, it needs
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# to be supported for now for the following reasons.
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# * /data/user_*/0/*/code_cache/* POSSIBLE uses (b/117841367)
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# 1) com.android.opengl.shaders_cache
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# 2) com.android.skia.shaders_cache
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# 3) com.android.renderscript.cache
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# * /data/user_de/0/com.google.android.gms/app_chimera
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# TODO: Tighten (b/112357170)
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allow priv_app privapp_data_file:file execute;
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allow priv_app privapp_data_file:lnk_file create_file_perms;
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# Priv apps can find services that expose both @SystemAPI and normal APIs.
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allow priv_app app_api_service:service_manager find;
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allow priv_app system_api_service:service_manager find;
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allow priv_app audioserver_service:service_manager find;
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allow priv_app cameraserver_service:service_manager find;
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allow priv_app drmserver_service:service_manager find;
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allow priv_app mediadrmserver_service:service_manager find;
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allow priv_app mediaextractor_service:service_manager find;
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allow priv_app mediametrics_service:service_manager find;
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allow priv_app mediaserver_service:service_manager find;
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allow priv_app music_recognition_service:service_manager find;
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allow priv_app network_watchlist_service:service_manager find;
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allow priv_app nfc_service:service_manager find;
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allow priv_app oem_lock_service:service_manager find;
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allow priv_app persistent_data_block_service:service_manager find;
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allow priv_app radio_service:service_manager find;
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allow priv_app recovery_service:service_manager find;
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allow priv_app stats_service:service_manager find;
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# Write to /cache.
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allow priv_app { cache_file cache_recovery_file }:dir create_dir_perms;
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allow priv_app { cache_file cache_recovery_file }:file create_file_perms;
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# /cache is a symlink to /data/cache on some devices. Allow reading the link.
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allow priv_app cache_file:lnk_file r_file_perms;
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# Access to /data/media.
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allow priv_app media_rw_data_file:dir create_dir_perms;
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allow priv_app media_rw_data_file:file create_file_perms;
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# Used by Finsky / Android "Verify Apps" functionality when
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# running "adb install foo.apk".
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allow priv_app shell_data_file:file r_file_perms;
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allow priv_app shell_data_file:dir r_dir_perms;
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# Allow traceur to pass file descriptors through a content provider to betterbug
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allow priv_app trace_data_file:file { getattr read };
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# Allow the bug reporting frontend to read the presence and timestamp of the
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# trace attached to the bugreport (but not its contents, which will go in the
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# usual bugreport .zip file). This is used by the bug reporting UI to tell if
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# the bugreport will contain a system trace or not while the bugreport is still
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# in progress.
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allow priv_app perfetto_traces_bugreport_data_file:dir r_dir_perms;
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allow priv_app perfetto_traces_bugreport_data_file:file { getattr };
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# Required to traverse the parent dir (/data/misc/perfetto-traces).
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allow priv_app perfetto_traces_data_file:dir { search };
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# Allow verifier to access staged apks.
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allow priv_app { apk_tmp_file apk_private_tmp_file }:dir r_dir_perms;
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allow priv_app { apk_tmp_file apk_private_tmp_file }:file r_file_perms;
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# For AppFuse.
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allow priv_app vold:fd use;
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allow priv_app fuse_device:chr_file { read write };
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# /proc access
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allow priv_app {
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proc_vmstat
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}:file r_file_perms;
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allow priv_app sysfs_type:dir search;
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# Read access to /sys/class/net/wlan*/address
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r_dir_file(priv_app, sysfs_net)
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# Read access to /sys/block/zram*/mm_stat
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r_dir_file(priv_app, sysfs_zram)
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r_dir_file(priv_app, rootfs)
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# access the mac address
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allowxperm priv_app self:udp_socket ioctl SIOCGIFHWADDR;
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# Allow com.android.vending to communicate with statsd.
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binder_call(priv_app, statsd)
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# Allow Phone to read/write cached ringtones (opened by system).
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allow priv_app ringtone_file:file { getattr read write };
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# Access to /data/preloads
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allow priv_app preloads_data_file:file r_file_perms;
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allow priv_app preloads_data_file:dir r_dir_perms;
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allow priv_app preloads_media_file:file r_file_perms;
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allow priv_app preloads_media_file:dir r_dir_perms;
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read_runtime_log_tags(priv_app)
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# Write app-specific trace data to the Perfetto traced damon. This requires
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# connecting to its producer socket and obtaining a (per-process) tmpfs fd.
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perfetto_producer(priv_app)
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# Allow priv_apps to request and collect incident reports.
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# (Also requires DUMP and PACKAGE_USAGE_STATS permissions)
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allow priv_app incident_service:service_manager find;
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binder_call(priv_app, incidentd)
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allow priv_app incidentd:fifo_file { read write };
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# Allow profiling if the app opts in by being marked profileable/debuggable.
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can_profile_heap(priv_app)
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can_profile_perf(priv_app)
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# Allow priv_apps to check whether Dynamic System Update is enabled
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get_prop(priv_app, dynamic_system_prop)
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# suppress denials for non-API accesses.
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dontaudit priv_app exec_type:file getattr;
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dontaudit priv_app device:dir read;
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dontaudit priv_app fs_bpf:dir search;
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dontaudit priv_app net_dns_prop:file read;
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dontaudit priv_app proc:file read;
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dontaudit priv_app proc_interrupts:file read;
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dontaudit priv_app proc_modules:file read;
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dontaudit priv_app proc_net:file read;
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dontaudit priv_app proc_stat:file read;
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dontaudit priv_app proc_version:file read;
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dontaudit priv_app sysfs:dir read;
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dontaudit priv_app sysfs:file read;
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dontaudit priv_app sysfs_android_usb:file read;
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dontaudit priv_app sysfs_dm:file r_file_perms;
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dontaudit priv_app { wifi_prop wifi_hal_prop }:file read;
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# allow privileged apps to use UDP sockets provided by the system server but not
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# modify them other than to connect
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allow priv_app system_server:udp_socket {
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connect getattr read recvfrom sendto write getopt setopt };
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# Access the IncFS list of features
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r_dir_file(priv_app, sysfs_fs_incfs_features)
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# allow apps like Phonesky to check the file signature of an apk installed on
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# the Incremental File System, fill missing blocks and get the app status
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allowxperm priv_app apk_data_file:file ioctl {
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INCFS_IOCTL_READ_SIGNATURE
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INCFS_IOCTL_FILL_BLOCKS
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INCFS_IOCTL_GET_BLOCK_COUNT
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};
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# allow privileged data loader apps (e.g. com.android.vending) to read logs from Incremental File System
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allow priv_app incremental_control_file:file { read getattr ioctl };
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# allow apps like Phonesky to request permission to fill blocks of an apk file
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# on the Incremental File System.
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allowxperm priv_app incremental_control_file:file ioctl INCFS_IOCTL_PERMIT_FILL;
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# Required for Phonesky to be able to read APEX files under /data/apex/active/.
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allow priv_app apex_data_file:dir search;
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allow priv_app staging_data_file:file r_file_perms;
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# Required for Phonesky to be able to read staged files under /data/app-staging.
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allow priv_app staging_data_file:dir r_dir_perms;
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# allow priv app to access the system app data files for ContentProvider case.
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allow priv_app system_app_data_file:file { read getattr };
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###
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### neverallow rules
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###
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# Receive or send uevent messages.
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neverallow priv_app domain:netlink_kobject_uevent_socket *;
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# Receive or send generic netlink messages
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neverallow priv_app domain:netlink_socket *;
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# Read or write kernel printk buffer
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neverallow priv_app kmsg_device:chr_file no_rw_file_perms;
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# Too much leaky information in debugfs. It's a security
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# best practice to ensure these files aren't readable.
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neverallow priv_app debugfs:file read;
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# Do not allow privileged apps to register services.
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# Only trusted components of Android should be registering
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# services.
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neverallow priv_app service_manager_type:service_manager add;
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# Do not allow privileged apps to connect to the property service
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# or set properties. b/10243159
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neverallow priv_app property_socket:sock_file write;
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neverallow priv_app init:unix_stream_socket connectto;
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neverallow priv_app property_type:property_service set;
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# Do not allow priv_app to be assigned mlstrustedsubject.
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# This would undermine the per-user isolation model being
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# enforced via levelFrom=user in seapp_contexts and the mls
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# constraints. As there is no direct way to specify a neverallow
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# on attribute assignment, this relies on the fact that fork
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# permission only makes sense within a domain (hence should
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# never be granted to any other domain within mlstrustedsubject)
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# and priv_app is allowed fork permission to itself.
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neverallow priv_app mlstrustedsubject:process fork;
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# Do not allow priv_app to hard link to any files.
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# In particular, if priv_app links to other app data
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# files, installd will not be able to guarantee the deletion
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# of the linked to file. Hard links also contribute to security
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# bugs, so we want to ensure priv_app never has this
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# capability.
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neverallow priv_app file_type:file link;
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# priv apps should not be able to open trace data files, they should depend
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# upon traceur to pass a file descriptor which they can then read
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neverallow priv_app trace_data_file:dir *;
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neverallow priv_app trace_data_file:file { no_w_file_perms open };
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# Do not allow priv_app access to cgroups.
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neverallow priv_app cgroup:file *;
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# Do not allow loading executable code from non-privileged
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# application home directories. Code loading across a security boundary
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# is dangerous and allows a full compromise of a privileged process
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# by an unprivileged process. b/112357170
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neverallow priv_app app_data_file:file no_x_file_perms;
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# Do not follow untrusted app provided symlinks
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neverallow priv_app app_data_file:lnk_file { open read getattr };
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