linux-kernel - Re: [PATCH repost] sched: export sched

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Message-ID: <4C52E22F.9060102@kernel.org>
Date:	Fri, 30 Jul 2010 16:31:11 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	"Michael S. Tsirkin" <mst@...hat.com>,
	Sridhar Samudrala <sri@...ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, netdev <netdev@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitri Vorobiev <dmitri.vorobiev@...ial.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH repost] sched: export sched_set/getaffinity to modules

Hello,

On 07/30/2010 04:19 PM, Oleg Nesterov wrote:
> But I must admit, I personally dislike this idea. A kernel thread which
> is the child of the user-space process, and in fact it is not the "real"
> kernel thread. I think this is against the common case. If you do not
> care the signals/reparenting, why can't you fork the user-space process
> which does all the work via ioctl's ? OK, I do not understand the problem
> domain, probably this can't work.

Having kernel threads which are children of user process is plain
scary considering the many things parent/children relationship implies
and various bugs and security vulnerabilities in the area.  I can't
pinpoint any problem but I think we really shouldn't be adding
something like this for this specific use case.  If we can get away
with exporting a few symbols, let's go that way.

Thanks.

-- 
tejun
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