If /proc/sys/kernel/modules_disabled is set to 1, then nobody (even full
root) may not read/write arbitrary kernel memory. In spite of it,
hibernation allows anyone with an access to either /dev/snapshot or
/sys/power/ make the full snapshot of the system. This snapshot may be
freely changed and uploaded back.
Signed-off-by: Vasiliy Kulikov <segoon@xxxxxxxxxxxx>
---
kernel/power/hibernate.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 1832bd2..1ac9eee 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -328,6 +328,9 @@ int hibernation_snapshot(int platform_mode)
{
int error;
+ if (modules_disabled)
+ return -EPERM;
+
error = platform_begin(platform_mode);
if (error)
goto Close;
@@ -385,6 +388,9 @@ static int resume_target_kernel(bool platform_mode)
{
int error;
+ if (modules_disabled)
+ return -EPERM;
+
error = dpm_suspend_noirq(PMSG_QUIESCE);
if (error) {
printk(KERN_ERR "PM: Some devices failed to power down, "
--
1.7.0.4
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