linux-kernel - Re: [PATCH 02/11] mm,migration: Do not try to migrate unmapped anonymous pages

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Message-ID: <alpine.DEB.2.00.1003171139280.27268@router.home>
Date:	Wed, 17 Mar 2010 11:41:10 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	Minchan Kim <minchan.kim@...il.com>, Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 02/11] mm,migration: Do not try to migrate unmapped 
 anonymous pages

On Wed, 17 Mar 2010, KAMEZAWA Hiroyuki wrote:

> Ah, my point is "how use-after-free is detected ?"

The slab layers do not check for use after free conditions if
SLAB_DESTROY_BY_RCU is set. It is legal to access the object after a
kfree() etc as long as the RCU period has not passed.

> Then, my question is
> "Does use-after-free check for SLAB_DESTROY_BY_RCU work correctly ?"

Use after free checks are not performed for SLAB_DESTROY_BY_RCU slabs.


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