| # audioserver - audio services daemon |
| |
| typeattribute audioserver coredomain; |
| |
| type audioserver_exec, exec_type, file_type; |
| init_daemon_domain(audioserver) |
| |
| r_dir_file(audioserver, sdcard_type) |
| |
| binder_use(audioserver) |
| binder_call(audioserver, binderservicedomain) |
| binder_call(audioserver, appdomain) |
| binder_service(audioserver) |
| |
| hal_client_domain(audioserver, hal_allocator) |
| # /system/lib64/hw for always-passthrough Allocator HAL ashmem / mapper .so |
| r_dir_file(audioserver, system_file) |
| |
| hal_client_domain(audioserver, hal_audio) |
| |
| userdebug_or_eng(` |
| # used for TEE sink - pcm capture for debug. |
| allow audioserver media_data_file:dir create_dir_perms; |
| allow audioserver audioserver_data_file:dir create_dir_perms; |
| allow audioserver audioserver_data_file:file create_file_perms; |
| |
| # ptrace to processes in the same domain for memory leak detection |
| allow audioserver self:process ptrace; |
| ') |
| |
| add_service(audioserver, audioserver_service) |
| allow audioserver appops_service:service_manager find; |
| allow audioserver batterystats_service:service_manager find; |
| allow audioserver permission_service:service_manager find; |
| allow audioserver power_service:service_manager find; |
| allow audioserver scheduling_policy_service:service_manager find; |
| |
| # Grant access to audio files to audioserver |
| allow audioserver audio_data_file:dir ra_dir_perms; |
| allow audioserver audio_data_file:file create_file_perms; |
| |
| # allow access to ALSA MMAP FDs for AAudio API |
| allow audioserver audio_device:chr_file { read write }; |
| |
| # For A2DP bridge which is loaded directly into audioserver |
| unix_socket_connect(audioserver, bluetooth, bluetooth) |
| |
| ### |
| ### neverallow rules |
| ### |
| |
| # audioserver should never execute any executable without a |
| # domain transition |
| neverallow audioserver { file_type fs_type }:file execute_no_trans; |
| |
| # The goal of the mediaserver split is to place media processing code into |
| # restrictive sandboxes with limited responsibilities and thus limited |
| # permissions. Example: Audioserver is only responsible for controlling audio |
| # hardware and processing audio content. Cameraserver does the same for camera |
| # hardware/content. Etc. |
| # |
| # Media processing code is inherently risky and thus should have limited |
| # permissions and be isolated from the rest of the system and network. |
| # Lengthier explanation here: |
| # https://android-developers.googleblog.com/2016/05/hardening-media-stack.html |
| neverallow audioserver domain:{ tcp_socket udp_socket rawip_socket } *; |
