linux-kernel - Re: [PATCH 1/6] mm: use mm_struct to resolve gate vma's in __get_user

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Date:	Wed, 9 Mar 2011 06:06:17 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Stephen Wilson <wilsons@...rt.ca>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Roland McGrath <roland@...hat.com>,
	Matt Mackall <mpm@...enic.com>,
	David Rientjes <rientjes@...gle.com>,
	Nick Piggin <npiggin@...nel.dk>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Mel Gorman <mel@....ul.ie>, Ingo Molnar <mingo@...e.hu>,
	Michel Lespinasse <walken@...gle.com>,
	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] mm: use mm_struct to resolve gate vma's in
 __get_user_pages

On Wed, Mar 09, 2011 at 02:19:30PM +0900, KOSAKI Motohiro wrote:

> Hmm..
> Is this works? In exec() case task has two mm, old and new-borned. tsk has
> no enough information to detect gate area if 64bit process exec 32bit process
> or oppsite case. On Linux, 32bit and 64bit processes have perfectly different
> process vma layout.
> 
> Am I missing something?

Patch series refered to in [0/6] ;-)  FWIW, that would probably be better
off as one mail thread - would be easier to find.

What happens is that mm_struct gets marked as 32bit/64bit at execve time
(on x86, everything else doesn't care), so this stuff becomes possible
to calculate by mm_struct alone.
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