1# mediametrics - daemon for collecting media.metrics data 2type mediametrics, domain; 3type mediametrics_exec, system_file_type, exec_type, file_type; 4 5 6binder_use(mediametrics) 7binder_call(mediametrics, binderservicedomain) 8binder_service(mediametrics) 9 10add_service(mediametrics, mediametrics_service) 11 12allow mediametrics system_server:fd use; 13 14r_dir_file(mediametrics, cgroup) 15r_dir_file(mediametrics, cgroup_v2) 16allow mediametrics proc_meminfo:file r_file_perms; 17 18# allows interactions with dumpsys to GMScore 19allow mediametrics { app_data_file privapp_data_file }:file write; 20 21# allow access to package manager for uid->apk mapping 22allow mediametrics package_native_service:service_manager find; 23 24# Allow metrics service to send information to statsd socket. 25unix_socket_send(mediametrics, statsdw, statsd) 26 27### 28### neverallow rules 29### 30 31# mediametrics should never execute any executable without a 32# domain transition 33neverallow mediametrics { file_type fs_type }:file execute_no_trans; 34 35# The goal of the mediaserver split is to place media processing code into 36# restrictive sandboxes with limited responsibilities and thus limited 37# permissions. Example: Audioserver is only responsible for controlling audio 38# hardware and processing audio content. Cameraserver does the same for camera 39# hardware/content. Etc. 40# 41# Media processing code is inherently risky and thus should have limited 42# permissions and be isolated from the rest of the system and network. 43# Lengthier explanation here: 44# https://android-developers.googleblog.com/2016/05/hardening-media-stack.html 45neverallow mediametrics domain:{ tcp_socket udp_socket rawip_socket } *; 46