linux-kernel - Hugepage cleanup and bugfix

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Message-Id: <1329366240-11663-1-git-send-email-david@gibson.dropbear.id.au>
Date:	Thu, 16 Feb 2012 15:23:58 +1100
From:	David Gibson <david@...son.dropbear.id.au>
To:	akpm@...ux-foundation.org, abarry@...y.com
Cc:	hughd@...gle.com, mgorman@...e.de, minchan.kim@...il.com,
	paulus@...ba.org, linux-kernel@...r.kernel.org
Subject: Hugepage cleanup and bugfix

Hi, this is a revised version of Andrew Barry's fix for the hugepage
race between unmount and quota update.  In fact it's not just that
race which is a problem, it's a more general use-after-free problem on
fs inodes from the hugepage code.

Despite all the abstract talk in the patch comments about layering
violations, this fixes a real, exploitable, crash bug which has been
in the kernel for a very long time now.

Andrew, please apply.

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