33 lines
1.2 KiB
Diff
33 lines
1.2 KiB
Diff
From: Matthew Garrett <mjg59@srcf.ucam.org>
|
|
Date: Wed, 8 Nov 2017 15:11:33 +0000
|
|
Subject: [10/29] uswsusp: Disable when the kernel is locked down
|
|
Origin: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/commit?id=706def46d58e9c69e91db506305485731f615e44
|
|
|
|
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@srcf.ucam.org>
|
|
Signed-off-by: David Howells <dhowells@redhat.com>
|
|
Reviewed-by: "Lee, Chun-Yi" <jlee@suse.com>
|
|
Reviewed-by: James Morris <james.l.morris@oracle.com>
|
|
cc: linux-pm@vger.kernel.org
|
|
---
|
|
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;
|
|
+
|
|
lock_system_sleep();
|
|
|
|
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
|