Re: DO NOT APPLY: x86-64, espfix: Don't leak bits 31:16 of %esp returning to 16-bit stack
From: Greg KH
Date: Tue Jul 15 2014 - 20:45:03 EST
On Tue, Jul 15, 2014 at 04:56:36PM -0700, Andrew Lutomirski wrote:
> On Tue, Jul 15, 2014 at 4:52 PM, Greg KH <greg@xxxxxxxxx> wrote:
> > On Tue, Jul 15, 2014 at 04:21:46PM -0700, Andrew Lutomirski wrote:
> >> On Tue, Jul 15, 2014 at 2:28 PM, Kamal Mostafa <kamal@xxxxxxxxxxxxx> wrote:
> >> > 18.104.22.168 -stable review patch. If anyone has any objections, please let me know.
> >> >
> >> > ------------------
> >> >
> >> > From: "H. Peter Anvin" <hpa@xxxxxxxxxxxxxxx>
> >> >
> >> > commit 3891a04aafd668686239349ea58f3314ea2af86b upstream.
> >> Do not apply to any -stable release yet. This causes nasty regressions on Xen.
> > I thought you all found the Xen-regression-fix patch a few hours ago,
> > right?
> That patch is insufficient: Xen guests still fail to initialize
> espfix64 correctly on SMP. It's currently unclear that espfix64 can
> work at all on Xen -- it's may be rather fundamentally incompatible
> with the Xen hypercall IRET mechanism. So it might need to be
> disabled entirely on Xen (and maybe Xen will fix the info leak in the
Ok, I'll pospone these all until the next round of stable releases next
week, Linus's tree should be fixed by then.
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