linux-kernel - [PATCH 09/16] hibernate: Disable when the kernel is locked down

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Message-ID: <147933290174.19316.1816410402202523415.stgit@warthog.procyon.org.uk>
Date:   Wed, 16 Nov 2016 21:48:21 +0000
From:   David Howells <dhowells@...hat.com>
To:     keyrings@...r.kernel.org
Cc:     matthew.garrett@...ula.com, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org, dhowells@...hat.com,
        linux-security-module@...r.kernel.org,
        Josh Boyer <jwboyer@...oraproject.org>
Subject: [PATCH 09/16] hibernate: Disable when the kernel is locked down

From: Josh Boyer <jwboyer@...oraproject.org>

There is currently no way to verify the resume image when returning
from hibernate.  This might compromise the signed modules trust model,
so until we can work with signed hibernate images we disable it when the
kernel is locked down.

Signed-off-by: Josh Boyer <jwboyer@...oraproject.org>
Signed-off-by: David Howells <dhowells@...hat.com>
---

 kernel/power/hibernate.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index b26dbc48c75b..a6ac5bd3f2a0 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -29,6 +29,7 @@
 #include <linux/ctype.h>
 #include <linux/genhd.h>
 #include <linux/ktime.h>
+#include <linux/security.h>
 #include <trace/events/power.h>
 
 #include "power.h"
@@ -67,7 +68,7 @@ static const struct platform_hibernation_ops *hibernation_ops;
 
 bool hibernation_available(void)
 {
-	return (nohibernate == 0);
+	return nohibernate == 0 && !kernel_is_locked_down();
 }
 
 /**