So here’s a verbose SGX question I can’t answer. It seems that SGX provides a couple of hundred secure monotonic counters for use in sealing data (this prevents rollbacks). 1/npic.twitter.com/6cLA9XJlVW
Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.
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So here’s a verbose SGX question I can’t answer. It seems that SGX provides a couple of hundred secure monotonic counters for use in sealing data (this prevents rollbacks). 1/npic.twitter.com/6cLA9XJlVW
There aren’t very many of these counters, and once an enclave claims one, it keeps it. You can’t exactly let another enclave take it back. So this is a limited resource. 2/3pic.twitter.com/rfLhx3aHhk
Which brings me to my question. On a desktop PC this is just annoying. But how the heck is this supposed to work when SGX is deployed to cloud servers? How will providers like AWS divvy up these counters? I’m just confused. 3/3
I'm sure that practically they will ignore the problem, at least until it becomes a resource with at least some contention.
But that’s what’s so neat about SGX. The minute a VM can launch a user-provided Enclave, I can *make* contention. I can use grab the counters on every Amazon server in a week.
By exhausting all AWS's counter resources, publicizing it, and shorting Intel stock.
"We built this feature and now someone broke it." Like division? Security? Nobody cared.
FDIV was treated as a big deal. They actually recalled and replaced the chips.
Long time ago, but I don't think it was worth shorting the stock worthy.
If you knew in advance it probably was. I'm not a historian but from vague personal memory it was a huge financial hit to Intel. Nowadays they get away with just not fixing critical flaws...
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