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 activity_service:service_manager find; 33allow audioserver appops_service:service_manager find; 34allow audioserver batterystats_service:service_manager find; 35allow audioserver permission_service:service_manager find; 36allow audioserver power_service:service_manager find; 37allow audioserver scheduling_policy_service:service_manager find; 38allow audioserver mediametrics_service:service_manager find; 39 40# Allow read/write access to bluetooth-specific properties 41set_prop(audioserver, bluetooth_a2dp_offload_prop) 42set_prop(audioserver, bluetooth_prop) 43set_prop(audioserver, exported_bluetooth_prop) 44 45# Grant access to audio files to audioserver 46allow audioserver audio_data_file:dir ra_dir_perms; 47allow audioserver audio_data_file:file create_file_perms; 48 49# allow access to ALSA MMAP FDs for AAudio API 50allow audioserver audio_device:chr_file { read write }; 51 52not_full_treble(`allow audioserver audio_device:dir r_dir_perms;') 53not_full_treble(`allow audioserver audio_device:chr_file rw_file_perms;') 54 55# For A2DP bridge which is loaded directly into audioserver 56unix_socket_connect(audioserver, bluetooth, bluetooth) 57 58# Allow shell commands from ADB and shell for CTS testing/dumping 59allow audioserver adbd:fd use; 60allow audioserver adbd:unix_stream_socket { read write }; 61allow audioserver shell:fifo_file { read write }; 62 63# Allow shell commands from ADB for CTS testing/dumping 64userdebug_or_eng(` 65 allow audioserver su:fd use; 66 allow audioserver su:fifo_file { read write }; 67 allow audioserver su:unix_stream_socket { read write }; 68') 69 70### 71### neverallow rules 72### 73 74# audioserver should never execute any executable without a 75# domain transition 76neverallow audioserver { file_type fs_type }:file execute_no_trans; 77 78# The goal of the mediaserver split is to place media processing code into 79# restrictive sandboxes with limited responsibilities and thus limited 80# permissions. Example: Audioserver is only responsible for controlling audio 81# hardware and processing audio content. Cameraserver does the same for camera 82# hardware/content. Etc. 83# 84# Media processing code is inherently risky and thus should have limited 85# permissions and be isolated from the rest of the system and network. 86# Lengthier explanation here: 87# https://android-developers.googleblog.com/2016/05/hardening-media-stack.html 88neverallow audioserver domain:{ tcp_socket udp_socket rawip_socket } *; 89