Re: [PATCH 1/3] x86: routines to choose random kernel base offset

[H. Peter Anvin]

On 04/05/2013 12:36 AM, Ingo Molnar wrote:
> 
> * Ingo Molnar <mingo@xxxxxxxxxx> wrote:
> 
>>
>> * Kees Cook <keescook@xxxxxxxxxxxx> 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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