From: Matthew Garrett <mjg59@srcf.ucam.org>
Date: Mon, 9 Sep 2013 08:46:52 -0400
Subject: [02/18] Enforce module signatures when securelevel is greater than 0
Origin: https://github.com/mjg59/linux/commit/90e0fa532b145d1bb76c368277a3a3e3b3eb5c94

If securelevel has been set to 1 or greater, require that all modules have
valid signatures.

Signed-off-by: Matthew Garrett <mjg59@srcf.ucam.org>
---
 kernel/module.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2616,7 +2616,7 @@ static int module_sig_check(struct load_
 	}
 
 	/* Not having a signature is only an error if we're strict. */
-	if (err == -ENOKEY && !sig_enforce)
+	if ((err == -ENOKEY && !sig_enforce) && (get_securelevel() <= 0))
 		err = 0;
 
 	return err;
