linux-kernel - [PATCH V31 08/25] hibernate: Disable when the kernel is locked down

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Message-Id: <20190326182742.16950-9-matthewgarrett@google.com>
Date:   Tue, 26 Mar 2019 11:27:24 -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,
        linux-api@...r.kernel.org, luto@...nel.org,
        Josh Boyer <jwboyer@...oraproject.org>,
        Matthew Garrett <mjg59@...gle.com>, rjw@...ysocki.net,
        pavel@....cz, linux-pm@...r.kernel.org
Subject: [PATCH V31 08/25] 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>
Signed-off-by: Matthew Garrett <mjg59@...gle.com>
Cc: rjw@...ysocki.net
Cc: pavel@....cz
cc: linux-pm@...r.kernel.org
---
 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 abef759de7c8..928b198cfa26 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -70,7 +70,8 @@ static const struct platform_hibernation_ops *hibernation_ops;
 
 bool hibernation_available(void)
 {
-	return (nohibernate == 0);
+	return nohibernate == 0 && !kernel_is_locked_down("Hibernation",
+							  LOCKDOWN_INTEGRITY);
 }
 
 /**
-- 
2.21.0.392.gf8f6787159e-goog