linux-kernel - Re: [RFC] c/r: prctl: Add ability to set new mm_struct::exe

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Message-ID: <20120313164426.GA29112@redhat.com>
Date:	Tue, 13 Mar 2012 17:44:26 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	Matt Helsley <matthltc@...ibm.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Kees Cook <keescook@...omium.org>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] c/r: prctl: Add ability to set new mm_struct::exe_file v3

On 03/13, Cyrill Gorcunov wrote:
>
> On Tue, Mar 13, 2012 at 08:00:44PM +0400, Cyrill Gorcunov wrote:
> > >
> > > This means that the num_exe_file_vmas check at the start is not needed.
> > > If you want it as a "fast-path" check, please fix the comment. Or just
> > > remove it. Otherwise the code looks as if we have to check them both.
> >
> > Yes, I wanted a fast test first, while the second test will give
> > one-shot condition and the second attempt to setup new exe_file
> > will fail. OK, I'll update the comment block.
> >
>
> Something like below?

Yes, looks good to me.

Oleg.

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