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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:
    > > > http://www.daemonology.net/hyperthreading-considered-harmful/
    > >
    > > Already read it. This link provides no more information than either of
    > > the above links provide.
    >
    > He's posted his paper now.
    >
    > http://www.daemonology.net/papers/htt.pdf
    >
    > 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... :-) )

    -Vadim
    -
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