uswsusp allows a user process to dump and then restore kernel state, which
makes it possible to modify the running kernel. Disable this if securelevel
has been set.
Signed-off-by: Matthew Garrett <matthew.garr...@nebula.com>
---
kernel/power/user.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 4ed81e7..520a9c4 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -24,6 +24,7 @@
#include <linux/console.h>
#include <linux/cpu.h>
#include <linux/freezer.h>
+#include <linux/security.h>
#include <asm/uaccess.h>
@@ -48,6 +49,9 @@ static int snapshot_open(struct inode *inode, struct file
*filp)
struct snapshot_data *data;
int error;
+ if (get_securelevel() > 0)
+ return -EPERM;
+
lock_system_sleep();
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
--
1.8.3.1
--
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