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; 46allow audioserver audio_service:service_manager find; 47 48# Allow read/write access to bluetooth-specific properties 49set_prop(audioserver, bluetooth_a2dp_offload_prop) 50set_prop(audioserver, bluetooth_audio_hal_prop) 51set_prop(audioserver, bluetooth_prop) 52set_prop(audioserver, exported_bluetooth_prop) 53 54# Grant access to audio files to audioserver 55allow audioserver audio_data_file:dir ra_dir_perms; 56allow audioserver audio_data_file:file create_file_perms; 57 58# allow access to ALSA MMAP FDs for AAudio API 59allow audioserver audio_device:chr_file { read write }; 60 61not_full_treble(`allow audioserver audio_device:dir r_dir_perms;') 62not_full_treble(`allow audioserver audio_device:chr_file rw_file_perms;') 63 64# For A2DP bridge which is loaded directly into audioserver 65unix_socket_connect(audioserver, bluetooth, bluetooth) 66 67# Allow shell commands from ADB and shell for CTS testing/dumping 68allow audioserver adbd:fd use; 69allow audioserver adbd:unix_stream_socket { read write }; 70allow audioserver shell:fifo_file { read write }; 71 72# Allow shell commands from ADB for CTS testing/dumping 73userdebug_or_eng(` 74 allow audioserver su:fd use; 75 allow audioserver su:fifo_file { read write }; 76 allow audioserver su:unix_stream_socket { read write }; 77') 78 79# Allow write access to log tag property 80set_prop(audioserver, log_tag_prop); 81 82### 83### neverallow rules 84### 85 86# audioserver should never execute any executable without a 87# domain transition 88neverallow audioserver { file_type fs_type }:file execute_no_trans; 89 90# The goal of the mediaserver split is to place media processing code into 91# restrictive sandboxes with limited responsibilities and thus limited 92# permissions. Example: Audioserver is only responsible for controlling audio 93# hardware and processing audio content. Cameraserver does the same for camera 94# hardware/content. Etc. 95# 96# Media processing code is inherently risky and thus should have limited 97# permissions and be isolated from the rest of the system and network. 98# Lengthier explanation here: 99# https://android-developers.googleblog.com/2016/05/hardening-media-stack.html 100neverallow audioserver domain:{ udp_socket rawip_socket } *; 101neverallow audioserver { domain userdebug_or_eng(`-su') }:tcp_socket *; 102 103# Allow using wake locks 104wakelock_use(audioserver) 105 106# Allow reading audio config props, e.g. af.fast_track_multiplier 107get_prop(audioserver, audio_config_prop) 108