Re: Hyper-Threading Vulnerability

Alan Cox
2005-05-13T18:38:05Z

> This is not a kernel problem, but a user space problem. The fix
> is to change the user space crypto code to need the same number of cache line
> accesses on all keys.

You actually also need to hit the same cache line sequence on all keys
if you take a bit more care about it.

> Disabling HT for this would the totally wrong approach, like throwing
> out the baby with the bath water.

HT for most users is pretty irrelevant, its a neat idea but the
benchmarks don't suggest its too big a hit