linux-kernel - Re: [PATCH] cgroup: fail if monitored file and event

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Message-ID: <20130218102411.GA3394@shutemov.name>
Date:	Mon, 18 Feb 2013 12:24:11 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Tejun Heo <tj@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>
Subject: Re: [PATCH] cgroup: fail if monitored file and event_control are in
 different cgroup

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@...wei.com>

Acked-by: Kirill A. Shutemov <kirill@...temov.name>

-- 
 Kirill A. Shutemov
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