linux-kernel - [PATCH 09/27] uswsusp: Disable when the kernel is locked down

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Message-Id: <20190325220954.29054-10-matthewgarrett@google.com>
Date:   Mon, 25 Mar 2019 15:09:36 -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,
        Matthew Garrett <mjg59@...f.ucam.org>,
        James Morris <james.l.morris@...cle.com>,
        linux-pm@...r.kernel.org, pavel@....cz, rjw@...ysocki.net,
        Matthew Garrett <matthewgarrett@...gle.com>
Subject: [PATCH 09/27] uswsusp: Disable when the kernel is locked down

From: Matthew Garrett <mjg59@...f.ucam.org>

uswsusp allows a user process to dump and then restore kernel state, which
makes it possible to modify the running kernel.  Disable this if the kernel
is locked down.

Signed-off-by: Matthew Garrett <mjg59@...f.ucam.org>
Signed-off-by: David Howells <dhowells@...hat.com>
Reviewed-by: James Morris <james.l.morris@...cle.com>
cc: linux-pm@...r.kernel.org
Cc: pavel@....cz
Cc: rjw@...ysocki.net
Signed-off-by: Matthew Garrett <matthewgarrett@...gle.com>
---
 kernel/power/user.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/power/user.c b/kernel/power/user.c
index 2d8b60a3c86b..0305d513c274 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -52,6 +52,9 @@ static int snapshot_open(struct inode *inode, struct file *filp)
 	if (!hibernation_available())
 		return -EPERM;
 
+	if (kernel_is_locked_down("/dev/snapshot"))
+		return -EPERM;
+
 	lock_system_sleep();
 
 	if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
-- 
2.21.0.392.gf8f6787159e-goog