platform_system_sepolicy/private/surfaceflinger.te

# surfaceflinger - display compositor service

typeattribute surfaceflinger coredomain;

type surfaceflinger_exec, exec_type, file_type;
init_daemon_domain(surfaceflinger)

typeattribute surfaceflinger mlstrustedsubject;
typeattribute surfaceflinger display_service_server;

read_runtime_log_tags(surfaceflinger)

# Perform HwBinder IPC.
hal_client_domain(surfaceflinger, hal_graphics_allocator)
hal_client_domain(surfaceflinger, hal_graphics_composer)
hal_client_domain(surfaceflinger, hal_configstore)
allow surfaceflinger hidl_token_hwservice:hwservice_manager find;

# 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_no_ioctl;

# Set properties.
set_prop(surfaceflinger, system_prop)
set_prop(surfaceflinger, exported_system_prop)
set_prop(surfaceflinger, exported2_system_prop)
set_prop(surfaceflinger, exported3_system_prop)
set_prop(surfaceflinger, ctl_bootanim_prop)

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

# Allow writing surface traces to /data/misc/wmtrace.
userdebug_or_eng(`
  allow surfaceflinger wm_trace_data_file:dir rw_dir_perms;
  allow surfaceflinger wm_trace_data_file:file { getattr setattr create w_file_perms };
')

# Use socket supplied by adbd, for cmd gpu vkjson etc.
allow surfaceflinger adbd:unix_stream_socket { read write getattr };

# 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_device:chr_file rw_file_perms;


# media.player service
add_service(surfaceflinger, gpu_service)

# do not use add_service() as hal_graphics_composer_default may be the
# provider as well
#add_service(surfaceflinger, surfaceflinger_service)
allow surfaceflinger surfaceflinger_service:service_manager { add find };

allow surfaceflinger mediaserver_service:service_manager find;
allow surfaceflinger permission_service:service_manager find;
allow surfaceflinger power_service:service_manager find;
allow surfaceflinger vr_manager_service:service_manager find;
allow surfaceflinger window_service:service_manager find;


# allow self to set SCHED_FIFO
allow surfaceflinger self:global_capability_class_set sys_nice;
allow surfaceflinger proc_meminfo:file r_file_perms;
r_dir_file(surfaceflinger, cgroup)
r_dir_file(surfaceflinger, system_file)
allow surfaceflinger tmpfs:dir r_dir_perms;
allow surfaceflinger system_server:fd use;
allow surfaceflinger ion_device:chr_file r_file_perms;

# pdx IPC
pdx_server(surfaceflinger, display_client)
pdx_server(surfaceflinger, display_manager)
pdx_server(surfaceflinger, display_screenshot)
pdx_server(surfaceflinger, display_vsync)

pdx_client(surfaceflinger, bufferhub_client)
pdx_client(surfaceflinger, performance_client)

###
### 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;