This is a note to let you know that I've just added the patch titled
cgroup: fail if monitored file and event_control are in different cgroup
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cgroup-fail-if-monitored-file-and-event_control-are-in-different-cgroup.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f169007b2773f285e098cb84c74aac0154d65ff7 Mon Sep 17 00:00:00 2001
From: Li Zefan <lizefan@xxxxxxxxxx>
Date: Mon, 18 Feb 2013 14:13:35 +0800
Subject: cgroup: fail if monitored file and event_control are in different cgroup
From: Li Zefan <lizefan@xxxxxxxxxx>
commit f169007b2773f285e098cb84c74aac0154d65ff7 upstream.
If we pass fd of memory.usage_in_bytes of cgroup A to cgroup.event_control
of cgroup B, then we won't get memory usage notification from A but B!
What's worse, if A and B are in different mount hierarchy, we'll end up
accessing NULL pointer!
Disallow this kind of invalid usage.
Signed-off-by: Li Zefan <lizefan@xxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: Weng Meiling <wengmeiling.weng@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/cgroup.c | 11 +++++++++++
1 file changed, 11 insertions(+)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -3498,6 +3498,7 @@ static int cgroup_write_event_control(st
const char *buffer)
{
struct cgroup_event *event = NULL;
+ struct cgroup *cgrp_cfile;
unsigned int efd, cfd;
struct file *efile = NULL;
struct file *cfile = NULL;
@@ -3552,6 +3553,16 @@ static int cgroup_write_event_control(st
goto fail;
}
+ /*
+ * The file to be monitored must be in the same cgroup as
+ * cgroup.event_control is.
+ */
+ cgrp_cfile = __d_cgrp(cfile->f_dentry->d_parent);
+ if (cgrp_cfile != cgrp) {
+ ret = -EINVAL;
+ goto fail;
+ }
+
if (!event->cft->register_event || !event->cft->unregister_event) {
ret = -EINVAL;
goto fail;
Patches currently in stable-queue which might be from lizefan@xxxxxxxxxx are
queue-3.0/cgroup-fail-if-monitored-file-and-event_control-are-in-different-cgroup.patch
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