Re: [PATCH] Sample fix for hyperthread exploit

Chris Wright
2005-06-01T17:25:26Z

* Con Kolivas (kernel@kolivas.org) wrote:
> On Wed, 1 Jun 2005 22:06, Arjan van de Ven wrote:
> > > Comments?
> >
> > I don't think it's really worth it, but if you go this way I'd rather do
> > this via a prctl() so that apps can tell the kernel "I'd like to run
> > exclusive on a core". That'd be much better than blindly isolating all
> > applications.
>
> I agree, and this is where we (could) implement the core isolation. I'm still
> under the impression (as you appear to be) that this theoretical exploit is
> not worth trying to work around.

Also, uid is not sufficient. Something more comprehensive (like ability
to ptrace) would be appropriate.

thanks,
-chris