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

[David Gibson <david@gibson.dropbear.id.au>]

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@kernel.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@kernel.crashing.org>
> Signed-off-by: Paul Mackerras <paulus@samba.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Acked-by: David Gibson <david@gibson.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_!
http://www.ozlabs.org/~dgibson
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