1# audioserver - audio services daemon 2 3typeattribute audioserver coredomain; 4 5type audioserver_exec, exec_type, file_type; 6init_daemon_domain(audioserver) 7 8r_dir_file(audioserver, sdcard_type) 9 10binder_use(audioserver) 11binder_call(audioserver, binderservicedomain) 12binder_call(audioserver, appdomain) 13binder_service(audioserver) 14 15hal_client_domain(audioserver, hal_allocator) 16# /system/lib64/hw for always-passthrough Allocator HAL ashmem / mapper .so 17r_dir_file(audioserver, system_file) 18 19hal_client_domain(audioserver, hal_audio) 20 21userdebug_or_eng(` 22 # used for TEE sink - pcm capture for debug. 23 allow audioserver media_data_file:dir create_dir_perms; 24 allow audioserver audioserver_data_file:dir create_dir_perms; 25 allow audioserver audioserver_data_file:file create_file_perms; 26 27 # ptrace to processes in the same domain for memory leak detection 28 allow audioserver self:process ptrace; 29') 30 31add_service(audioserver, audioserver_service) 32allow audioserver appops_service:service_manager find; 33allow audioserver batterystats_service:service_manager find; 34allow audioserver permission_service:service_manager find; 35allow audioserver power_service:service_manager find; 36allow audioserver scheduling_policy_service:service_manager find; 37 38# Grant access to audio files to audioserver 39allow audioserver audio_data_file:dir ra_dir_perms; 40allow audioserver audio_data_file:file create_file_perms; 41 42# allow access to ALSA MMAP FDs for AAudio API 43allow audioserver audio_device:chr_file { read write }; 44 45# For A2DP bridge which is loaded directly into audioserver 46unix_socket_connect(audioserver, bluetooth, bluetooth) 47 48### 49### neverallow rules 50### 51 52# audioserver should never execute any executable without a 53# domain transition 54neverallow audioserver { file_type fs_type }:file execute_no_trans; 55 56# The goal of the mediaserver split is to place media processing code into 57# restrictive sandboxes with limited responsibilities and thus limited 58# permissions. Example: Audioserver is only responsible for controlling audio 59# hardware and processing audio content. Cameraserver does the same for camera 60# hardware/content. Etc. 61# 62# Media processing code is inherently risky and thus should have limited 63# permissions and be isolated from the rest of the system and network. 64# Lengthier explanation here: 65# https://android-developers.googleblog.com/2016/05/hardening-media-stack.html 66neverallow audioserver domain:{ tcp_socket udp_socket rawip_socket } *; 67