I think this is a first

NTX-Zoner · May 18, 2005

Vuln

A vulnerability was found regarding shared cache on hyper threading processors that can allow information release to unprivileged processes.

I give Intel credit for being first to have a security vuln in there processors. FYI, this should not affect home users, only security conscious servers.

dropadrop · May 18, 2005

Not just HT, it affects anything running two threads and sharing cache.

Gnufsh · May 18, 2005

Interesting. I'm curious whether this affects IBM's or Sun's SMT and Dual Core implementations, or if they took steps to prevent it.

dropadrop · May 18, 2005

Gnufsh said:
Interesting. I'm curious whether this affects IBM's or Sun's SMT and Dual Core implementations, or if they took steps to prevent it.

As far as I understood, it's basicly anything running multiple threads and sharing cache between them. That includes differant hyperthreading variants in P4, Sparc and PowerPc, and any dualcore with shared cache.

Gnufsh · May 18, 2005

Right, but it talks about cache schemes to minimize vulnerability. I was wondering if anybody implemented something like this.

NTX-Zoner · May 24, 2005

From what I've read, the dual cores run separate cache for each core. They should not be affected. Most likely the newer Intel HT cores will will utilize a cache architecture that separate the cache for the threads.

dropadrop · May 24, 2005

Yes, this is the current Amd and Intel implementation, don't know about powerpc.

Gnufsh · May 24, 2005

AFAIK, the dual-core Power4 has a shared L2 cache.

I think this is a first

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