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Date: Thu, 17 Jul 2014 14:39:42 +0200 From: Daniel Borkmann <dborkman@...hat.com> To: "H. Peter Anvin" <hpa@...or.com> CC: Andy Lutomirski <luto@...capital.net>, kvm list <kvm@...r.kernel.org>, "Theodore Ts'o" <tytso@....edu>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Kees Cook <keescook@...omium.org>, X86 ML <x86@...nel.org>, Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>, Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>, Gleb Natapov <gleb@...nel.org>, Paolo Bonzini <pbonzini@...hat.com>, Bandan Das <bsd@...hat.com>, hannes@...essinduktion.org Subject: Re: [PATCH v3 2/5] random,x86: Add arch_get_slow_rng_u64 On 07/17/2014 12:59 AM, H. Peter Anvin wrote: > On 07/16/2014 03:40 PM, Andy Lutomirski wrote: >> On Wed, Jul 16, 2014 at 3:13 PM, Andy Lutomirski <luto@...capital.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. Yep, prandom() is quite heavily used in the network stack where it's traded for speed. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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