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View Full Version : Hyper-Threading Vulnerability

rg3
05-13-2005, 12:51 PM
http://kerneltrap.org/node/5103

I don't give it too much credit but it might be interesting. Affects all OSs.
Night Hacker
05-13-2005, 01:19 PM
Unless you use an AMD CPU in which case it doesn't effect you at all.

Did you read the credentials of the person who reported it? Seems like a pretty credible person to me.
rg3
05-13-2005, 02:13 PM
Yes, but there's no proof of concept so far.
Hudson
05-13-2005, 03:54 PM
Heh, glad i'm an AMD man http://forums.3drealms.com/ubbthreads/images/graemlins/grin.gif
Geir
05-13-2005, 04:48 PM
Hudson said:
Heh, glad i'm an AMD man http://forums.3drealms.com/ubbthreads/images/graemlins/grin.gif
DudeMiester
05-13-2005, 11:28 PM
Well if you get the dual core Athlons then you will have HyperThreading.
Jeff
05-14-2005, 01:12 AM
Hudson said:
Heh, glad i'm an AMD man http://forums.3drealms.com/ubbthreads/images/graemlins/grin.gif
TerminX
05-14-2005, 01:16 AM
DudeMiester said:
Well if you get the dual core Athlons then you will have HyperThreading.


No, you will have two full cores, which is completely different. They don't share cache or anything.
Bludd
05-14-2005, 05:42 AM
DudeMiester said:
Well if you get the dual core Athlons then you will have HyperThreading.



No, but if you get an Intel Pentium D Extreme Edition, you will get dual core and hyperthreading.

The dual core Athlons may appear to be hyperthreading to legacy software, though.
8IronBob
05-14-2005, 07:41 AM
Yeah, I can see myself going back to an AMD processor when I build or get a new PC in the next few years. Until then, I can only hope that McAfee Security will block any troubles from this rig. Unless this is a flaw not even the strongest Security Software Suite can overcome.
Night Hacker
05-14-2005, 12:44 PM
DudeMiester said:
Well if you get the dual core Athlons then you will have HyperThreading.



From what I understand they'll simulate hyperthreading.
DudeMiester
05-14-2005, 10:02 PM
It works either way, even though how it's handled internally is very different.

Also, for some reason I though the L2 was behind the crossbar in the X2 architecture, but my mistake, lol.
Dukefan
05-15-2005, 07:17 PM
Night Hacker said:
Did you read the credentials of the person who reported it? Seems like a pretty credible person to me.



Um, he's just a 23-year old with a Bachelor's in Math, and pursung a Ph.D. in computer science. Knowledgable, sure, but that doesn't make him a complete expert. Besides, if we started judging science based only on the degree you have, science would never progress.

His claim will stand or fall based solely on the facts of it. Not whether he has a Ph.D or not.
DudeMiester
05-15-2005, 08:33 PM
Well the facts are solid. Intel has acknologedged it too.
Orochi Avlis
05-16-2005, 09:15 AM
Hudson said:
Heh, glad i'm an AMD man http://forums.3drealms.com/ubbthreads/images/graemlins/grin.gif
Dukefan
05-16-2005, 12:20 PM
DudeMiester said:
Well the facts are solid. Intel has acknologedged it too.



Well, sucks for me, then, since I have a P4 with HT.

I wasn't saying anything about whether the facts were valid or not, just whether we could judge that solely based on the guy's credentials.
rg3
05-16-2005, 02:19 PM
Dukefan said:
Well, sucks for me, then, since I have a P4 with HT.




You should know that it's mostly safe to keep HT enabled for now in any computer. Furthermore, this is mainly an issue for multiuser machines where you can't trust all the users. Home computers are usually a different case.

http://www.daemonology.net/hyperthreading-considered-harmful/
Bludd
05-16-2005, 03:17 PM
Yep, I not gonna turn of HT just for this. HT makes the OS feel much more responsive.
Geir
05-16-2005, 03:32 PM
didn't the hyper threading extreme package fix this?