linux-kernel - Re: [Xen-devel] [PATCH] x86/xen: Fix 32-bit PV guests's usage of kernel

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Message-Id: <5345860D02000078000074FE@nat28.tlf.novell.com>
Date:	Wed, 09 Apr 2014 16:40:29 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Boris Ostrovsky" <boris.ostrovsky@...cle.com>
Cc:	"Andrew Cooper" <andrew.cooper3@...rix.com>,
	"David Vrabel" <david.vrabel@...rix.com>,
	<xen-devel@...ts.xenproject.org>, <srostedt@...hat.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH] x86/xen: Fix 32-bit PV guests's usage
 of kernel_stack

>>> On 09.04.14 at 17:38, <boris.ostrovsky@...cle.com> wrote:
> On 04/09/2014 11:01 AM, Jan Beulich wrote:
>>>>> On 09.04.14 at 16:41, <andrew.cooper3@...rix.com> wrote:
>>> The latter load however can easy fault; The arguments for %ds in
>>> XSA-42/ CVE-2013-0228 applies to %{e,f,g}s as well.
>> And it was only that latter operation that I pointed at.
> 
> We don't seem to reference %fs after the pop so doing the fixup (as 
> David suggested) should be enough?

Of course.

Jan

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