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 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.

	-hpa


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