platform_system_sepolicy/private/mediatranscoding.te

# mediatranscoding - daemon for transcoding video and image.
type mediatranscoding_exec, system_file_type, exec_type, file_type;
type mediatranscoding_tmpfs, file_type;
typeattribute mediatranscoding coredomain;

init_daemon_domain(mediatranscoding)
tmpfs_domain(mediatranscoding)
allow mediatranscoding appdomain_tmpfs:file { getattr map read write };

binder_use(mediatranscoding)
binder_call(mediatranscoding, binderservicedomain)
binder_call(mediatranscoding, appdomain)
binder_service(mediatranscoding)

add_service(mediatranscoding, mediatranscoding_service)

hal_client_domain(mediatranscoding, hal_graphics_allocator)
hal_client_domain(mediatranscoding, hal_configstore)
hal_client_domain(mediatranscoding, hal_omx)
hal_client_domain(mediatranscoding, hal_codec2)
hal_client_domain(mediatranscoding, hal_allocator)

allow mediatranscoding mediaserver_service:service_manager find;
allow mediatranscoding mediametrics_service:service_manager find;
allow mediatranscoding mediaextractor_service:service_manager find;
allow mediatranscoding package_native_service:service_manager find;
allow mediatranscoding thermal_service:service_manager find;

allow mediatranscoding system_server:fd use;
allow mediatranscoding activity_service:service_manager find;

# allow mediatranscoding service read/write permissions for file sources
allow mediatranscoding sdcardfs:file { getattr read write };
allow mediatranscoding media_rw_data_file:file { getattr read write };
allow mediatranscoding apk_data_file:file { getattr read };
allow mediatranscoding app_data_file:file { getattr read write };
allow mediatranscoding shell_data_file:file { getattr read write };

# allow mediatranscoding service write permission to statsd socket
unix_socket_send(mediatranscoding, statsdw, statsd)

# Allow mediatranscoding to access the DMA-BUF system heap
allow mediatranscoding dmabuf_system_heap_device:chr_file r_file_perms;

allow mediatranscoding gpu_device:dir search;

# Allow mediatranscoding service to access media-related system properties
get_prop(mediatranscoding, media_config_prop)

# mediatranscoding should never execute any executable without a
# domain transition
neverallow mediatranscoding { file_type fs_type }:file execute_no_trans;

# The goal of the mediaserver split is to place media processing code into
# restrictive sandboxes with limited responsibilities and thus limited
# permissions. Example: Audioserver is only responsible for controlling audio
# hardware and processing audio content. Cameraserver does the same for camera
# hardware/content. Etc.
#
# Media processing code is inherently risky and thus should have limited
# permissions and be isolated from the rest of the system and network.
# Lengthier explanation here:
# https://android-developers.googleblog.com/2016/05/hardening-media-stack.html
neverallow mediatranscoding domain:{ udp_socket rawip_socket } *;
neverallow mediatranscoding { domain userdebug_or_eng(`-su') }:tcp_socket *;