Re: Hyper-Threading Vulnerability

Lee Revell
2005-05-13T23:02:36Z

On Fri, 2005-05-13 at 23:47 +0100, Alan Cox wrote:
> On Gwe, 2005-05-13 at 22:59, Matt Mackall wrote:
> > It might not be much of a problem though. If he's a bit off per guess
> > (really impressive), he'll still be many bits off by the time there's
> > enough entropy in the primary pool to reseed the secondary pool so he
> > can check his guesswork.
>
> You can also disable the tsc to user space in the intel processors.
> Thats something they anticipated as being neccessary in secure
> environments long ago. This makes the attack much harder.

And break the hundreds of apps that depend on rdtsc? Am I missing
something?

Lee