linux-kernel - Re: [RFC][PATCHSET] mremap/mmap mess

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Date:	Wed, 09 Dec 2009 14:39:18 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	David Miller <davem@...emloft.net>,
	Ollie Wild <aaw@...gle.com>, Rik van Riel <riel@...hat.com>,
	viro@....linux.org.uk, linux-arch@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCHSET] mremap/mmap mess

On Wed, 2009-12-09 at 13:24 +0000, Al Viro wrote:

> > That is, IIRC the problem is that you need to have the argc/env in place
> > for the binfmt engine thing, and need to have ran the binfmt engine
> > thing before you know the personality.
> > 
> > As to your idea, if that were feasible we could do without the copy and
> > simply steal the pages directly from the old mm.
> 
> *raised brows*
> Old mm may bloody well be still shared, so I'd be vary of trying that -
> there's a lot of nasty surprises we could get on that way.

Good point, but I think we might be able to do the copy from old to new
in flush_old_exec() if we can get the binfmt things to pass the right
address along (or set it in the brpm struct). It looks like it has clue
about personality at that point.

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