Re: [PATCH v3 1/5] x86,kvm: Add MSR_KVM_GET_RNG_SEED and a matching feature bit

Andy Lutomirski
2014-07-17T17:45:22Z

On Thu, Jul 17, 2014 at 10:43 AM, Andrew Honig <ahonig@google.com> wrote:
>> + case MSR_KVM_GET_RNG_SEED:
>> + get_random_bytes(&data, sizeof(data));
>> + break;
>
> Should this be rate limited in the interest of conserving randomness?
> If there ever is an attack on the prng, this would create very
> favorable conditions for an attacker to exploit it.

IMO if the nonblocking pool has a weakness that requires us to
conserve its output, then this is the least of our worries.

--Andy