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Date:   Thu,  9 Nov 2017 17:31:53 +0000
From:   David Howells <>
Subject: [PATCH 10/30] uswsusp: Disable when the kernel is locked down

From: Matthew Garrett <>

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 <>
Signed-off-by: David Howells <>
Reviewed-by: "Lee, Chun-Yi" <>
Reviewed-by: James Morris <>

 kernel/power/user.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/power/user.c b/kernel/power/user.c
index 22df9f7ff672..678ade9decfe 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;
 	if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {

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