linux-kernel - [PATCH 10/24] hibernate: Disable when the kernel is locked down

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Date:   Wed, 05 Apr 2017 18:11:29 +0100
From:   David Howells <dhowells@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     gnomes@...rguk.ukuu.org.uk, Josh Boyer <jwboyer@...oraproject.org>,
        matthew.garrett@...ula.com, linux-efi@...r.kernel.org,
        gregkh@...uxfoundation.org, dhowells@...hat.com,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org
Subject: [PATCH 10/24] 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 |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index a8b978c35a6a..50cca5dcb62f 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -70,7 +70,7 @@ static const struct platform_hibernation_ops *hibernation_ops;
 
 bool hibernation_available(void)
 {
-	return (nohibernate == 0);
+	return nohibernate == 0 && !kernel_is_locked_down();
 }
 
 /**