platform_system_sepolicy/public/audioserver.te

# audioserver - audio services daemon
type audioserver, domain;
type audioserver_exec, exec_type, file_type;

r_dir_file(audioserver, sdcard_type)

binder_use(audioserver)
binder_call(audioserver, binderservicedomain)
binder_call(audioserver, { appdomain ephemeral_app })
binder_service(audioserver)

hwbinder_use(audioserver)
binder_call(audioserver, android_hardware_audio_2_0_service)

r_dir_file(audioserver, proc)
allow audioserver ion_device:chr_file r_file_perms;
allow audioserver system_file:dir r_dir_perms;

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;
')

allow audioserver audio_device:dir r_dir_perms;
allow audioserver audio_device:chr_file rw_file_perms;

allow audioserver audioserver_service:service_manager { add find };
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;

# Needed on some devices for playing audio on paired BT device,
# but seems appropriate for all devices.
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;

# audioserver should never need network access. Disallow network sockets.
neverallow audioserver domain:{ tcp_socket udp_socket rawip_socket } *;