platform_system_sepolicy/surfaceflinger.te

# surfaceflinger - display compositor service
type surfaceflinger, domain;
type surfaceflinger_exec, exec_type, file_type;

init_daemon_domain(surfaceflinger)
typeattribute surfaceflinger mlstrustedsubject;

# Talk to init over the property socket.
unix_socket_connect(surfaceflinger, property, init)

# Perform Binder IPC.
binder_use(surfaceflinger)
binder_call(surfaceflinger, binderservicedomain)
binder_call(surfaceflinger, appdomain)
binder_call(surfaceflinger, bootanim)
binder_service(surfaceflinger)

# Binder IPC to bu, presently runs in adbd domain.
binder_call(surfaceflinger, adbd)

# Read /proc/pid files for Binder clients.
r_dir_file(surfaceflinger, binderservicedomain)
r_dir_file(surfaceflinger, appdomain)

# Access the GPU.
allow surfaceflinger gpu_device:chr_file rw_file_perms;

# Access /dev/graphics/fb0.
allow surfaceflinger graphics_device:dir search;
allow surfaceflinger graphics_device:chr_file rw_file_perms;

# Access /dev/video1.
allow surfaceflinger video_device:dir r_dir_perms;
allow surfaceflinger video_device:chr_file rw_file_perms;

# Create and use netlink kobject uevent sockets.
allow surfaceflinger self:netlink_kobject_uevent_socket create_socket_perms;

# Set properties.
allow surfaceflinger system_prop:property_service set;
allow surfaceflinger ctl_bootanim_prop:property_service set;

# Use open files supplied by an app.
allow surfaceflinger appdomain:fd use;
allow surfaceflinger app_data_file:file { read write };

# Use open file provided by bootanim.
allow surfaceflinger bootanim:fd use;

# Allow a dumpstate triggered screenshot
binder_call(surfaceflinger, dumpstate)
binder_call(surfaceflinger, shell)
r_dir_file(surfaceflinger, dumpstate)

# Needed on some devices for playing DRM protected content,
# but seems expected and appropriate for all devices.
allow surfaceflinger tee:unix_stream_socket connectto;
allow surfaceflinger tee_device:chr_file rw_file_perms;

allow surfaceflinger surfaceflinger_service:service_manager add;

# Audited locally.
service_manager_local_audit_domain(surfaceflinger)
auditallow surfaceflinger {
    service_manager_type
    -surfaceflinger_service
    -system_server_service
}:service_manager find;

###
### Neverallow rules
###
### surfaceflinger should NEVER do any of this

# Do not allow accessing SDcard files as unsafe ejection could
# cause the kernel to kill the process.
neverallow surfaceflinger sdcard_type:file rw_file_perms;