android10/system/sepolicy/public/hal_cas.te

# HwBinder IPC from client to server, and callbacks
binder_call(hal_cas_client, hal_cas_server)
binder_call(hal_cas_server, hal_cas_client)

hal_attribute_hwservice(hal_cas, hal_cas_hwservice)
allow hal_cas_server hidl_memory_hwservice:hwservice_manager find;

# Permit reading device's serial number from system properties
get_prop(hal_cas_server, serialno_prop)

# Read files already opened under /data
allow hal_cas system_data_file:file { getattr read };

# Read access to pseudo filesystems
r_dir_file(hal_cas, cgroup)
allow hal_cas cgroup:dir { search write };
allow hal_cas cgroup:file w_file_perms;

# Allow access to ion memory allocation device
allow hal_cas ion_device:chr_file rw_file_perms;
allow hal_cas hal_graphics_allocator:fd use;

allow hal_cas tee_device:chr_file rw_file_perms;

###
### neverallow rules
###

# hal_cas should never execute any executable without a
# domain transition
neverallow hal_cas_server { file_type fs_type }:file execute_no_trans;

# do not allow privileged socket ioctl commands
neverallowxperm hal_cas_server domain:{ rawip_socket tcp_socket udp_socket } ioctl priv_sock_ioctls;