linux-kernel - [PATCH 08/27] hibernate: Disable when the kernel is locked down

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Message-Id: <20190325220954.29054-9-matthewgarrett@google.com>
Date:   Mon, 25 Mar 2019 15:09:35 -0700
From:   Matthew Garrett <matthewgarrett@...gle.com>
To:     jmorris@...ei.org
Cc:     linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, dhowells@...hat.com,
        Josh Boyer <jwboyer@...oraproject.org>, rjw@...ysocki.net,
        pavel@....cz, linux-pm@...r.kernel.org,
        Matthew Garrett <matthewgarrett@...gle.com>
Subject: [PATCH 08/27] 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>
Cc: rjw@...ysocki.net
Cc: pavel@....cz
cc: linux-pm@...r.kernel.org
Signed-off-by: Matthew Garrett <matthewgarrett@...gle.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 abef759de7c8..802795becb88 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("Hibernation");
 }
 
 /**
-- 
2.21.0.392.gf8f6787159e-goog