microdroid/sepolicy/system/private/surfaceflinger.te

# surfaceflinger - display compositor service

typeattribute surfaceflinger coredomain;

type surfaceflinger_exec, system_file_type, exec_type, file_type;
init_daemon_domain(surfaceflinger)
tmpfs_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)
typeattribute surfaceflinger_tmpfs hal_graphics_composer_client_tmpfs;
hal_client_domain(surfaceflinger, hal_codec2)
hal_client_domain(surfaceflinger, hal_omx)
hal_client_domain(surfaceflinger, hal_configstore)
hal_client_domain(surfaceflinger, hal_power)
hal_client_domain(surfaceflinger, hal_bufferhub)
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_call(surfaceflinger, system_server);
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, bootanim_system_prop)
set_prop(surfaceflinger, exported_system_prop)
set_prop(surfaceflinger, exported3_system_prop)
set_prop(surfaceflinger, ctl_bootanim_prop)
set_prop(surfaceflinger, surfaceflinger_display_prop)

# Get properties.
get_prop(surfaceflinger, qemu_sf_lcd_density_prop)

# Use open files supplied by an app.
allow surfaceflinger appdomain:fd use;
allow surfaceflinger { app_data_file privapp_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 };
')

# Needed to register as a Perfetto producer.
perfetto_producer(surfaceflinger)

# 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)

# media.player 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 };

add_service(surfaceflinger, vrflinger_vsync_service)

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 surfaceflinger inputflinger_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, cgroup_v2)
r_dir_file(surfaceflinger, system_file)
allow surfaceflinger tmpfs:dir r_dir_perms;
allow surfaceflinger system_server:fd use;
allow surfaceflinger system_server:unix_stream_socket { read write };
allow surfaceflinger ion_device:chr_file r_file_perms;
allow surfaceflinger dmabuf_system_heap_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)

# Allow supplying timestats statistics to statsd
allow surfaceflinger stats_service:service_manager find;
allow surfaceflinger statsmanager_service:service_manager find;
# TODO(146461633): remove this once native pullers talk to StatsManagerService
binder_call(surfaceflinger, statsd);

# Allow pushing jank event atoms to statsd
userdebug_or_eng(`
    unix_socket_send(surfaceflinger, statsdw, statsd)
')

# Surfaceflinger should not be reading default vendor-defined properties.
dontaudit surfaceflinger vendor_default_prop:file read;

###
### 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;

# b/68864350
dontaudit surfaceflinger unlabeled:dir search;