custom_method effectively allows arbitrary access to system memory, making
it possible for an attacker to circumvent restrictions on module loading.
Disable it if the kernel is locked down.
Signed-off-by: NMatthew Garrett <mjg59@google.com>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Reviewed-by: NKees Cook <keescook@chromium.org>
cc: linux-acpi@vger.kernel.org
Signed-off-by: NJames Morris <jmorris@namei.org>