-------- Original Message --------
Subject: Re: DRAMA countermeasures
Date: 2016-08-24 10:07
From: Daniel Gruss <gruss at tugraz.at>
To: bancfc at openmailbox.org
Cc: peter.pessl at iaik.tugraz.at, clementine.maurice at iaik.tugraz.at,
Stefan.Mangard at iaik.tugraz.at, whonix-devel at whonix.org
On 23.08.2016 19:18, bancfc at openmailbox.org wrote:
> Can you please go into more details on what can be done under such
> constraints?
Detection via performance counters could work... There is no work on
detecting DRAMA with performance counters yet, but maybe Anders Fogh's
blog post on the topic of detecting microarchitectural attack with
performance counters is a good start:
http://dreamsofastone.blogspot.co.at/2015/11/detecting-stealth-mode-cache-attacks.html
> Is there a concept of per-CPU memory boundaries within a single cell
> that can guarantee resource partitioning? Say 4GB RAM split among 4
> CPUs
> - each CPU has a gig each (which becomes the max limit we can safely
> assign per guest)
I think hypervisors are aware of NUMA node memory. But I have no
experience with setting up hypervisors in such setups...
If a guest is only on one CPU and no other guest is on that CPU, the max
limit per guest is the amount of memory that is managed by the NUMA node
of the CPU. Typically you will have some setup like 4 channels with each
1 DIMM of 8GB RAM, 2 CPUs (each manages 2 channels in 1 NUMA node). Then
you can safely assign the lower 16GB to one CPU and the higher 16GB to
the other CPU. Then guests on different CPUs will be unable to attack
each other using DRAMA. But as far as I know, hypervisors are aware of
NUMA node memory and if you disable node interleaving, the hypervisor
should not even let you assign memory that exceeds the size of a NUMA
node.
> KVM supports memory locking so that not even the host can use the pages
> assigned to a VM. Can this help?:
>> "When set and supported by the hypervisor, memory pages belonging to
> the
> domain will be locked in host's memory and the host will not be allowed
> to swap them out."
I'm not sure this is the right feature...
> Thanks. I hope my questions aren't a bother :) I appreciate your
> feedback.
No, thank you for your interest in our work ;)
Cheers,
Daniel
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