Re: Patch "x86-64, espfix: Don't leak bits 31:16 of %esp returning to 16-bit stack" has been added to the 3.4-stable tree

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On Mon, Aug 04, 2014 at 04:39:19PM -0700, H. Peter Anvin wrote:
> On 08/04/2014 04:37 PM, Greg KH wrote:
> > On Mon, Aug 04, 2014 at 04:21:52PM -0700, H. Peter Anvin wrote:
> >> On 08/04/2014 10:38 AM, Greg KH wrote:
> >>> On Fri, Jul 18, 2014 at 02:59:02PM -0700, Andrew Lutomirski wrote:
> >>>> Still not ready :(
> >>>
> >>>
> >>> This should now be resolved with commit
> >>> 7209a75d2009dbf7745e2fd354abf25c3deb3ca3 (x86_64/entry/xen: Do not
> >>> invoke espfix64 on Xen), right?
> >>>
> >>
> >> Yes... although it reintroduces the original problem on Xen PV.  It
> >> simply isn't fixable in the kernel; it has to be fixed in the Xen
> >> hypervisor.
> > 
> > Ok, so what do I do here?  7209a75d2009dbf7745e2fd354abf25c3deb3ca3
> > doesn't apply to 3.15 and older due to the previous set of changes (this
> > thread) is not there.  Am I supposed to wait some random amount of time
> > and hope some other project gets around to updating their code?
> > 
> > Any reason why I can't apply this series now, and then if the Xen people
> > care about this, they will fix their server up when they get the chance
> > to?
> > 
> 
> No, we should do exactly that (and we -- meaning myself and/or Andy)
> will have to massage it to fit.

Ok, I'll queue these patches up again and let's see what happens :)

thanks,

greg k-h
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