Re: Hyper-Threading Vulnerability

Jim Crilly
2005-05-13T19:20:30Z

On 05/13/05 02:38:03PM -0400, Richard F. Rebel wrote:
> On Fri, 2005-05-13 at 20:03 +0200, Andi Kleen wrote:
> > This is not a kernel problem, but a user space problem. The fix
> > is to change the user space crypto code to need the same number of cache line
> > accesses on all keys.
> >
> > Disabling HT for this would the totally wrong approach, like throwing
> > out the baby with the bath water.
> >
> > -Andi
>
> Why? It's certainly reasonable to disable it for the time being and
> even prudent to do so.

And what if you have more than one physical HT processor? AFAIK there's no
way to disable HT and still run SMP at the same time.

>
> --
> Richard F. Rebel
>
> cat /dev/null > `tty`

Jim.