1# audioserver - audio services daemon 2type audioserver_exec, exec_type, file_type, system_file_type; 3typeattribute audioserver coredomain; 4 5init_daemon_domain(audioserver) 6tmpfs_domain(audioserver) 7 8r_dir_file(audioserver, sdcard_type) 9r_dir_file(audioserver, fuse) 10 11binder_use(audioserver) 12binder_call(audioserver, binderservicedomain) 13binder_call(audioserver, appdomain) 14binder_service(audioserver) 15 16hal_client_domain(audioserver, hal_allocator) 17# /system/lib64/hw for always-passthrough Allocator HAL ashmem / mapper .so 18r_dir_file(audioserver, system_file) 19 20hal_client_domain(audioserver, hal_audio) 21 22userdebug_or_eng(` 23 # used for TEE sink - pcm capture for debug. 24 allow audioserver media_data_file:dir create_dir_perms; 25 allow audioserver audioserver_data_file:dir create_dir_perms; 26 allow audioserver audioserver_data_file:file create_file_perms; 27 28 # ptrace to processes in the same domain for memory leak detection 29 allow audioserver self:process ptrace; 30') 31 32add_service(audioserver, audioserver_service) 33allow audioserver activity_service:service_manager find; 34allow audioserver appops_service:service_manager find; 35allow audioserver batterystats_service:service_manager find; 36allow audioserver external_vibrator_service:service_manager find; 37allow audioserver package_native_service:service_manager find; 38allow audioserver permission_service:service_manager find; 39allow audioserver permission_checker_service:service_manager find; 40allow audioserver power_service:service_manager find; 41allow audioserver scheduling_policy_service:service_manager find; 42allow audioserver mediametrics_service:service_manager find; 43allow audioserver sensor_privacy_service:service_manager find; 44allow audioserver soundtrigger_middleware_service:service_manager find; 45allow audioserver audio_service:service_manager find; 46allow audioserver virtual_device_native_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# Allow audioserver to signal audio HAL processes and dump their stacks. 83allow audioserver hal_audio_server:process signal; 84 85# Allow audioserver to access sensorservice. 86allow audioserver sensorservice_service:service_manager find; 87allow audioserver system_server:unix_stream_socket { read write }; 88 89# Allow using wake locks 90wakelock_use(audioserver) 91 92# Allow reading audio config props, e.g. af.fast_track_multiplier 93get_prop(audioserver, audio_config_prop) 94get_prop(audioserver, system_audio_config_prop) 95 96### 97### neverallow rules 98### 99 100# audioserver should never execute any executable without a 101# domain transition 102neverallow audioserver { file_type fs_type }:file execute_no_trans; 103 104# The goal of the mediaserver split is to place media processing code into 105# restrictive sandboxes with limited responsibilities and thus limited 106# permissions. Example: Audioserver is only responsible for controlling audio 107# hardware and processing audio content. Cameraserver does the same for camera 108# hardware/content. Etc. 109# 110# Media processing code is inherently risky and thus should have limited 111# permissions and be isolated from the rest of the system and network. 112# Lengthier explanation here: 113# https://android-developers.googleblog.com/2016/05/hardening-media-stack.html 114neverallow audioserver domain:{ udp_socket rawip_socket } *; 115neverallow audioserver { domain userdebug_or_eng(`-su') }:tcp_socket *; 116