public/hal_audio.te

# HwBinder IPC from client to server, and callbacks
binder_call(hal_audio_client, hal_audio_server)
binder_call(hal_audio_server, hal_audio_client)

allow hal_audio ion_device:chr_file r_file_perms;

userdebug_or_eng(`
  # used for pcm capture for debug.
  allow hal_audio audiohal_data_file:dir create_dir_perms;
  allow hal_audio audiohal_data_file:file create_file_perms;
')

r_dir_file(hal_audio, proc)
allow hal_audio audio_device:dir r_dir_perms;
allow hal_audio audio_device:chr_file rw_file_perms;

# Needed to provide debug dump output via dumpsys' pipes.
allow hal_audio shell:fd use;
allow hal_audio shell:fifo_file write;
allow hal_audio dumpstate:fd use;
allow hal_audio dumpstate:fifo_file write;

# Needed on some devices for playing audio on paired BT device,
# but seems appropriate for all devices.
unix_socket_connect(hal_audio, bluetooth, bluetooth)

###
### neverallow rules
###

# Should never execute any executable without a domain transition
neverallow hal_audio { file_type fs_type }:file execute_no_trans;

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

# Only audio HAL may directly access the audio hardware
neverallow { halserverdomain -hal_audio_server } audio_device:chr_file *;