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

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Date:	Fri, 25 Feb 2011 10:57:09 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Oleg Nesterov <oleg@...hat.com>
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 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.

                        Linus
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