asus-wmi: Restrict debugfs interface when the kernel is locked down

asus-wmi: Restrict debugfs interface when the kernel is locked down

We have no way of validating what all of the Asus WMI methods do on a given
machine - and there's a risk that some will allow hardware state to be
manipulated in such a way that arbitrary code can be executed in the
kernel, circumventing module loading restrictions.  Prevent that if the
kernel is locked down.

Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: "Lee, Chun-Yi" <jlee@suse.com>
cc: acpi4asus-user@lists.sourceforge.net
cc: platform-driver-x86@vger.kernel.org

Gbp-Pq: Topic features/all/lockdown
Gbp-Pq: Name 0014-asus-wmi-Restrict-debugfs-interface-when-the-kernel-.patch