Messages in this thread | | | Date | Mon, 11 Nov 2013 12:04:18 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [tip:x86/kaslr] x86, kaslr: Provide randomness functions |
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On 11/11/2013 11:58 AM, Ingo Molnar wrote: >> >> 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. >
Well, it is a 16-bit 1.19318 MHz counter so at least on older systems it is likely to provide at least a modicum on entropy. On systems with a TSC it is likely to be redundant with the TSC.
> In any case there's no excuse for not mixing RDRAND and RDTSC entropy.
-hpa
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