On 04/05/2013 12:36 AM, Ingo Molnar wrote:
>
> * Ingo Molnar <mi...@kernel.org> wrote:
>
>>
>> * Kees Cook <keesc...@chromium.org> wrote:
>>
>>> This provides routines for selecting a randomized kernel base offset,
>>> bounded by e820 details. It tries to use RDRAND and falls back to RDTSC.
>>> If "noaslr" is on the kernel command line, no offset will be used.
>>
>> Would it make sense to also add three other sources of entropy:
>
> In any case, would it be possible to also mix these bootup sources of
> entropy into our regular random pool?
>
> That would improve random pool entropy on all Linux systems, not just
> those that choose to enable kernel-base-address randomization.
>
I think we already do at least some of these, but at this point, for any
non-RDRAND-capable hardware we could almost certainly do better for any
definition of anything at all.
RDRAND is obviously the ultimate solution here.
-hpa
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