platform_system_sepolicy/public/servicemanager.te

# servicemanager - the Binder context manager
type servicemanager, domain, domain_deprecated, mlstrustedsubject;
type servicemanager_exec, exec_type, file_type;

# Note that we do not use the binder_* macros here.
# servicemanager is unique in that it only provides
# name service (aka context manager) for Binder.
# As such, it only ever receives and transfers other references
# created by other domains.  It never passes its own references
# or initiates a Binder IPC.
allow servicemanager self:binder set_context_mgr;
allow servicemanager { domain -init }:binder transfer;

r_dir_file(servicemanager, rootfs)

# Check SELinux permissions.
selinux_check_access(servicemanager)