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SubjectRe: Hyper-Threading Vulnerability
On Fri, 13 May 2005, Andy Isaacson wrote:

> On Fri, May 13, 2005 at 10:32:48AM -0400, Jeff Garzik wrote:
> > Daniel Jacobowitz wrote:
> > >
> >
> > Already read it. This link provides no more information than either of
> > the above links provide.
> He's posted his paper now.
> It's a side channel timing attack on data-dependent computation through
> the L1 and L2 caches. Nice work. In-the-wild exploitation is
> difficult, though; your timing gets screwed up if you get scheduled away
> from your victim, and you don't even know, because you can't tell where
> you were scheduled, so on any reasonably busy multiuser system it's not
> clear that the attack is practical.
> -andy
> -

Wouldn't scheduling appear as a rather big time delta (in measuring the
cache access times), so you would know to disregard that data point?

(Just wondering... :-) )

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