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