Fwd: [Cryptography] "Flip Feng Shui: Hammering a Needle in the Software Stack"

[rsw at jfet.org (Riad S. Wahby)]

Mirimir <mirimir at riseup.net> wrote:
> On 09/02/2016 12:21 AM, Riad S. Wahby wrote:
> > As an aside: note that the attack the Xiao paper describes only works
> > against Xen guests that *don't* use hardware-assisted page tables
> > (EPT for Intel, NPT for AMD). If you're using hardware-assisted
> > virtualization (e.g., most Amazon "HVM" instances), this particular
> > attack won't work; others might, of course.
> 
> It also won't work if VMs don't share RAM, right?

RAM sharing is necessary for the Razavi et al. attack. The Xen attack
is from Xiao et al.

-=rsw