linux-kernel - [PATCH 04/24] Enforce module signatures if the kernel is locked down

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Message-ID: <149142330358.5101.11872619513155932508.stgit@warthog.procyon.org.uk>
Date:   Wed, 05 Apr 2017 21:15:03 +0100
From:   David Howells <dhowells@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     gnomes@...rguk.ukuu.org.uk, linux-efi@...r.kernel.org,
        matthew.garrett@...ula.com, gregkh@...uxfoundation.org,
        dhowells@...hat.com, linux-security-module@...r.kernel.org,
        keyrings@...r.kernel.org
Subject: [PATCH 04/24] Enforce module signatures if the kernel is locked down

If the kernel is locked down, require that all modules have valid
signatures that we can verify.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 kernel/module.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/module.c b/kernel/module.c
index 7eba6dea4f41..3331f2eb9b93 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2756,7 +2756,7 @@ static int module_sig_check(struct load_info *info, int flags)
 	}
 
 	/* Not having a signature is only an error if we're strict. */
-	if (err == -ENOKEY && !sig_enforce)
+	if (err == -ENOKEY && !sig_enforce && !kernel_is_locked_down())
 		err = 0;
 
 	return err;