linux-kernel - Re: [PATCH 2/5] exec: introduce "bool compat" argument

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Date:	Sat, 26 Feb 2011 13:37:13 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, pageexec@...email.hu,
	Solar Designer <solar@...nwall.com>,
	Eugene Teo <eteo@...hat.com>,
	Brad Spengler <spender@...ecurity.net>,
	Roland McGrath <roland@...hat.com>,
	Milton Miller <miltonm@....com>
Subject: Re: [PATCH 2/5] exec: introduce "bool compat" argument

On 02/25, Linus Torvalds wrote:
>
> On Fri, Feb 25, 2011 at 9:52 AM, Oleg Nesterov <oleg@...hat.com> wrote:
> > No functional changes, preparation to simplify the review.
>
> I think this is wrong.
>
> If you introduce the "bool compat" thing, you should also change the
> type of the argument pointers to some opaque type at the same time.
> It's no longer really a
>
>   const char __user *const __user *
>
> pointer at that point. Trying to claim it is, is just wrong. The type
> suddently becomes conditional on that 'compat' variable.

Yes, this is true.

And I agree this could be done in more clean way, just we need more
changed. Please see the next email.

Oleg.

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