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SubjectRe: Hyper-Threading Vulnerability


On Sun, 15 May 2005, Andi Kleen wrote:

> On Fri, May 13, 2005 at 09:16:09PM +0200, Diego Calleja wrote:
> > El Fri, 13 May 2005 20:03:58 +0200,
> > Andi Kleen <ak@muc.de> escribi?:
> >
> >
> > > 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.
> >
> >
> > However they've patched the FreeBSD kernel to "workaround?" it:
> > ftp://ftp.freebsd.org/pub/FreeBSD/CERT/patches/SA-05:09/htt5.patch
>
> That's a similar stupid idea as they did with the disk write
> cache (lowering the MTBFs of their disks by considerable factors,
> which is much worse than the power off data loss problem)
> Let's not go down this path please.

What wrong did they do with disk write cache?

Mikulas

> -Andi
>
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