1# audioserver - audio services daemon 2 3typeattribute audioserver coredomain; 4 5type audioserver_exec, exec_type, file_type, system_file_type; 6init_daemon_domain(audioserver) 7tmpfs_domain(audioserver) 8 9r_dir_file(audioserver, sdcard_type) 10r_dir_file(audioserver, fuse) 11 12binder_use(audioserver) 13binder_call(audioserver, binderservicedomain) 14binder_call(audioserver, appdomain) 15binder_service(audioserver) 16 17hal_client_domain(audioserver, hal_allocator) 18# /system/lib64/hw for always-passthrough Allocator HAL ashmem / mapper .so 19r_dir_file(audioserver, system_file) 20 21hal_client_domain(audioserver, hal_audio) 22 23userdebug_or_eng(` 24 # used for TEE sink - pcm capture for debug. 25 allow audioserver media_data_file:dir create_dir_perms; 26 allow audioserver audioserver_data_file:dir create_dir_perms; 27 allow audioserver audioserver_data_file:file create_file_perms; 28 29 # ptrace to processes in the same domain for memory leak detection 30 allow audioserver self:process ptrace; 31') 32 33add_service(audioserver, audioserver_service) 34allow audioserver activity_service:service_manager find; 35allow audioserver appops_service:service_manager find; 36allow audioserver batterystats_service:service_manager find; 37allow audioserver external_vibrator_service:service_manager find; 38allow audioserver package_native_service:service_manager find; 39allow audioserver permission_service:service_manager find; 40allow audioserver permission_checker_service:service_manager find; 41allow audioserver power_service:service_manager find; 42allow audioserver scheduling_policy_service:service_manager find; 43allow audioserver mediametrics_service:service_manager find; 44allow audioserver sensor_privacy_service:service_manager find; 45allow audioserver soundtrigger_middleware_service:service_manager find; 46 47# Allow read/write access to bluetooth-specific properties 48set_prop(audioserver, bluetooth_a2dp_offload_prop) 49set_prop(audioserver, bluetooth_audio_hal_prop) 50set_prop(audioserver, bluetooth_prop) 51set_prop(audioserver, exported_bluetooth_prop) 52 53# Grant access to audio files to audioserver 54allow audioserver audio_data_file:dir ra_dir_perms; 55allow audioserver audio_data_file:file create_file_perms; 56 57# allow access to ALSA MMAP FDs for AAudio API 58allow audioserver audio_device:chr_file { read write }; 59 60not_full_treble(`allow audioserver audio_device:dir r_dir_perms;') 61not_full_treble(`allow audioserver audio_device:chr_file rw_file_perms;') 62 63# For A2DP bridge which is loaded directly into audioserver 64unix_socket_connect(audioserver, bluetooth, bluetooth) 65 66# Allow shell commands from ADB and shell for CTS testing/dumping 67allow audioserver adbd:fd use; 68allow audioserver adbd:unix_stream_socket { read write }; 69allow audioserver shell:fifo_file { read write }; 70 71# Allow shell commands from ADB for CTS testing/dumping 72userdebug_or_eng(` 73 allow audioserver su:fd use; 74 allow audioserver su:fifo_file { read write }; 75 allow audioserver su:unix_stream_socket { read write }; 76') 77 78# Allow write access to log tag property 79set_prop(audioserver, log_tag_prop); 80 81### 82### neverallow rules 83### 84 85# audioserver should never execute any executable without a 86# domain transition 87neverallow audioserver { file_type fs_type }:file execute_no_trans; 88 89# The goal of the mediaserver split is to place media processing code into 90# restrictive sandboxes with limited responsibilities and thus limited 91# permissions. Example: Audioserver is only responsible for controlling audio 92# hardware and processing audio content. Cameraserver does the same for camera 93# hardware/content. Etc. 94# 95# Media processing code is inherently risky and thus should have limited 96# permissions and be isolated from the rest of the system and network. 97# Lengthier explanation here: 98# https://android-developers.googleblog.com/2016/05/hardening-media-stack.html 99neverallow audioserver domain:{ udp_socket rawip_socket } *; 100neverallow audioserver { domain userdebug_or_eng(`-su') }:tcp_socket *; 101 102# Allow using wake locks 103wakelock_use(audioserver) 104 105# Allow reading audio config props, e.g. af.fast_track_multiplier 106get_prop(audioserver, audio_config_prop) 107