linux-kernel - Re: [stable] [PATCH 2/2] xen: don't drop NX bit

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Message-ID: <20080617231334.GK21814@sequoia.sous-sol.org>
Date:	Tue, 17 Jun 2008 16:13:34 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Greg KH <greg@...ah.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Stable Kernel <stable@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [stable] [PATCH 2/2] xen: don't drop NX bit

* Greg KH (greg@...ah.com) wrote:
> On Mon, Jun 16, 2008 at 03:01:56PM -0700, Jeremy Fitzhardinge wrote:
> > When converting the pfn/mfn in a pagetable entry, make sure we mask
> > out the protection flags properly.  Formerly, this code was losing the
> > NX bit, and not dealing with extra Xen-defined software flags in ptes.
> > 
> > Because NX is now enforced properly, we must put the hypercall page
> > into the .text segment so that it is executable.
> > 
> > Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> > Cc: Stable Kernel <stable@...nel.org>
> 
> While it's great that you tell the stable people about this, but is it
> realistic?  Is anyone using Xen as contained in the mainline kernel
> these days?
> 
> If a distro were to be based on 2.6.25 and we take this patch, they will
> just revert it back out due to their very large Xen patchset they apply
> on top to get a "working" Xen version, right?

Fedora uses proper pv-ops for Xen.  It's a good -stable candidate.

Acked-by: Chris Wright <chrisw@...s-sol.org>

thanks,
-chris
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