linux-kernel - Re: [PATCH] mm: Fix to infinite churning of mlocked page

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4A8C98DD.9030500@redhat.com>
Date:	Wed, 19 Aug 2009 20:29:17 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Minchan Kim <minchan.kim@...il.com>
CC:	linux-mm <linux-mm@...ck.org>, lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Lee Schermerhorn <lee.schermerhorn@...com>
Subject: Re: [PATCH] mm: Fix to infinite churning of mlocked page

Minchan Kim wrote:
> Mlocked page might lost the isolatation race.
> It cause the page to clear PG_mlocked while it remains
> in VM_LOCKED vma. It means it can be put [in]active list.
> We can rescue it by try_to_unmap in shrink_page_list.
> 
> But now, As Wu Fengguang pointed out, vmscan have a bug.
> If the page has PG_referenced, it can't reach try_to_unmap
> in shrink_page_list but put into active list. If the page
> is referenced repeatedly, it can remain [in]active list
> without moving unevictable list.
> 
> This patch can fix it.
> 
> Reported-by: Wu Fengguang <fengguang.wu@...el.com>
> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> Cc: KOSAKI Motohiro <<kosaki.motohiro@...fujitsu.com>
> Cc: Lee Schermerhorn <lee.schermerhorn@...com>
> Cc: Rik van Riel <riel@...hat.com>

Acked-by: Rik van Riel <riel@...hat.com>

-- 
All rights reversed.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/