* H. Peter Anvin <h...@zytor.com> wrote:
> On 11/11/2013 11:37 AM, Kees Cook wrote:
> > On Mon, Nov 11, 2013 at 11:27 AM, H. Peter Anvin <h...@zytor.com> wrote:
> >> On 11/11/2013 10:20 AM, Ingo Molnar wrote:
> >>>
> >>> Why aren't the 3 sources of entropy XOR-ed together?
> >>
> >> Note we don't want to poke i8254 if we have any other sources, as the
> >> i8254 may not be present on newer systems and in some other cases not
> >> safe to touch. We can XOR in the TSC with RDRAND although it seems a
> >> bit odd.
> >
> > I await the final decision! :)
> >
>
> Use the i8254 if and only if nothing else is available, it isn't safe to
> touch on some newer systems.
I concur - the i8254 is probably also a low entry source, given that this
all runs early bootup.
In any case there's no excuse for not mixing RDRAND and RDTSC entropy.
Thanks,
Ingo
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