linux-kernel - Re: [patch] cgroups: disallow attaching kthreadd

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Message-ID: <20120404230648.GB2173@dhcp-172-17-108-109.mtv.corp.google.com>
Date:	Wed, 4 Apr 2012 16:06:48 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Mike Galbraith <mgalbraith@...e.de>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Li Zefan <lizf@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Paul Menage <paul@...lmenage.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch] cgroups: disallow attaching kthreadd

On Wed, Apr 04, 2012 at 04:34:38AM +0200, Mike Galbraith wrote:
> It looked to me like yes, because cgroup_attach_task() can be called
> directly.  For the problem at hand, user script doing bad things, no,
> it's not needed.

Then that's a kernel bug.  We're just trying to protect userland from
shotting itself, so please just keep the one in the user-facing
interface.

Thanks.

-- 
tejun
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