Re: Hyper-Threading Vulnerability

[Jeff Garzik <jgarzik@pobox.com>]

Daniel Jacobowitz wrote:
> On Fri, May 13, 2005 at 10:10:36AM -0400, Jeff Garzik wrote:
>
> > Barry K. Nathan wrote:
> >
> > > On Fri, May 13, 2005 at 07:51:20AM +0200, Gabor MICSKO wrote:
> > >
> > >
> > > > Is this flaw affects the current stable Linux kernels? Workaround?
> > > > Patch?
> >
> > Simple.  Just boot a uniprocessor kernel, and/or disable HT in BIOS.
> >
> >
> >
> > > Some pages with relevant information:
> > > http://www.ussg.iu.edu/hypermail/linux/kernel/0403.2/0920.html
> > > http://bugzilla.kernel.org/show_bug.cgi?id=2317
> >
> > These pages have zero information on the "flaw."  In fact, I can see no 
> > information at all proving that there is even a problem here.
> >
> > Classic "I found a problem, but I'm keeping the info a secret" security 
> > crapola.
>
>
> FYI:
>   http://www.daemonology.net/hyperthreading-considered-harmful/

Already read it.  This link provides no more information than either of 
the above links provide.


> I don't much agree with Colin about the severity of the problem, but
> I've read his paper, which should be generally available later today.
> It's definitely a legitimate issue.

We'll see...

As of this moment, there continues to be _zero_ information proving that 
a problem exists.

	Jeff


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