Re: [PATCH] cgroup: fail if monitored file and event_control are in different cgroup

Kirill A. Shutemov
2013-02-18T10:24:11Z

On Mon, Feb 18, 2013 at 02:13:35PM +0800, Li Zefan wrote:
> 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-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>

Acked-by: Kirill A. Shutemov <kirill-oKw7cIdHH8eLwutG50LtGA@public.gmane.org>

--
Kirill A. Shutemov