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novaflare
The Dragon Was Here
Premium
join:2002-01-24
Barberton, OH
| Re: "HyperThreading considered harmful" wel steve it may also be possible for a remopte user to do the same. Example run a java app on web site that stays active. Then you might be able to exploit the flaw remotly. And take your pick of other threads. It would be hard as hell but probably doable. Ive never delt with a hardware securit flaw before. But getting a buffer over run is similar to a hardware security flaw realy. Essentialy what your doing is putting things in to ram area from one programs area to another programs area of ram. So it should be at least possible to do the same with a cpus cache.
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Steve
I'm a PC, so shut up
Consultant
join:2001-03-10
Yorba Linda, CA
| Re: "HyperThreading considered harmful" said by novaflare  : Example run a java app on web site that stays active. No way.
I think this is beyond the pale of what one can do. I think it's going to be impossible for a Java application to do this, because aside from the fact that it doesn't have access to the CPU instructions required to do this kind of hyper-highresolution timing, Java has so much overhead that it's going to confound any efforts at measuring these timing differences.But getting a buffer over run is similar to a hardware security flaw realy. Hmmm, did you actually read the paper?
There is no circumstance where thread #1 can read or write data cached by thread #2 - it can only make some guesses about which memory thread #2 is accessing. This revolves around subtle timing issues, not modifying memory.
Steve
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Stephen J. Friedl • Unix Wizard • Microsoft Security MVP • Tustin, California USA • my web site | |
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novaflare
The Dragon Was Here
Premium
join:2002-01-24
Barberton, OH
| Re: "HyperThreading considered harmful" just used as a example. It how ever is probably possible to do so with spyware torjans or other apps you could trick the user in to downloading. And i only read part of it. Before posting reading more now. Ither way intel needs to take serious action to correct it.
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BeesTea
Network Janitor
Premium,VIP
join:2003-03-08
00000
| said by Steve :No way. I think this is beyond the pale of what one can do. I think it's going to be impossible for a Java application to do this, Ditto.
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Marilla
I Am My Own Arbiter
Premium
join:2002-12-06
Belpre, OH
| said by Steve :There is no circumstance where thread #1 can read or write data cached by thread #2 - it can only make some guesses about which memory thread #2 is accessing. This revolves around subtle timing issues, not modifying memory. Hence, my interest, and my headache!
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