Non-root user may read the key back after root wrote it there.
This removes read access to everyone but root.
Signed-off-by: NYehezkel Bernat <yehezkel.bernat@intel.com>
Acked-by: NMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>