uswsusp allows a user process to dump and then restore kernel state, which
makes it possible to modify the running kernel. Disable this if
trusted_kernel is true.
Signed-off-by: Matthew Garrett <matthew.garrett@xxxxxxxxxx>
---
kernel/power/user.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 98d3575..2d7a5d3 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>
@@ -49,6 +50,9 @@ static int snapshot_open(struct inode *inode, struct file *filp)
struct snapshot_data *data;
int error;
+ if (get_trusted_kernel())
+ return -EPERM;
+
lock_system_sleep();
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
--
1.8.5.3
--
To unsubscribe from this list: send the line "unsubscribe linux-efi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
