linux-kernel - Re: [patch 07/12] powerpc: Fix size check for hugetlbfs

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Date:	Tue, 14 Aug 2007 17:56:13 +1000
From:	David Gibson <david@...son.dropbear.id.au>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	linuxppc-dev list <linuxppc-dev@...abs.org>,
	Theodore Ts'o <tytso@....edu>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Justin Forbes <jmforbes@...uxtx.org>,
	Domenico Andreoli <cavokz@...il.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Paul Mackerras <paulus@...ba.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Michael Krufky <mkrufky@...uxtv.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk
Subject: Re: [patch 07/12] powerpc: Fix size check for hugetlbfs

On Tue, Aug 14, 2007 at 12:29:18AM -0700, Greg KH wrote:
> -stable review patch.  If anyone has any objections, please let us know.
> 
> ------------------
> From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> 
> My "slices" address space management code that was added in 2.6.22
> implementation of get_unmapped_area() doesn't properly check that the
> size is a multiple of the requested page size. This allows userland to
> create VMAs that aren't a multiple of the huge page size with hugetlbfs
> (since hugetlbfs entirely relies on get_unmapped_area() to do that
> checking) which leads to a kernel BUG() when such areas are torn down.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Signed-off-by: Paul Mackerras <paulus@...ba.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

Acked-by: David Gibson <david@...son.dropbear.id.au>

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
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