Re: [PATCH v3 2/5] random,x86: Add arch_get_slow_rng_u64

H. Peter Anvin
2014-07-16T22:59:57Z

On 07/16/2014 03:40 PM, Andy Lutomirski wrote:
> On Wed, Jul 16, 2014 at 3:13 PM, Andy Lutomirski <luto@amacapital.net> wrote:
>> My personal preference is to defer this until some user shows up. I
>> think that even this would be too complicated for KASLR, which is the
>> only extremely early-boot user that I found.
>>
>> Hmm. Does the prandom stuff want to use this?
>
> prandom isn't even using rdrand. I'd suggest fixing this separately,
> or even just waiting until someone goes and deletes prandom.
>

prandom is exactly the opposite; it is designed for when we need
possibly low quality random numbers very quickly. RDRAND is actually
too slow.

-hpa