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From: John Baldwin <jhb@freebsd.org>
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Subject: Re: FreeBSD Security Advisory FreeBSD-SA-12:04.sysret
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On Wednesday, June 13, 2012 6:37:58 pm Greg Lewis wrote:
> On Tue, Jun 12, 2012 at 01:26:33PM +0000, FreeBSD Security Advisories wrote:
> > IV.  Workaround
> > 
> > No workaround is available.
> > 
> > However FreeBSD/amd64 running on AMD CPUs is not vulnerable to this
> > particular problem.
> > 
> > Systems with 64 bit capable CPUs, but running the 32 bit FreeBSD/i386
> > kernel are not vulnerable, nor are systems running on different
> > processor architectures.
> 
> I found these last two paragraphs a little confusing.  Is the correct
> interpretation that FreeBSD/amd64 running on Intel CPUs is the vulnerable
> combination?

It is only know that AMD CPUs are safe.  It is not known if non-AMD, non-Intel 
CPUs (e.g. the 64-bit capable VIA CPUs) are vulnerable.

-- 
John Baldwin