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From: Andy Lutomirski <luto@amacapital.net>
Date: Wed, 16 Jul 2014 17:03:21 -0700
Message-ID: <CALCETrVSG_Lp=OSw-U+QK+_VsEhKBS=rBQ3ojTrnO9kAKR+Qag@mail.gmail.com>
Subject: Re: [PATCH v3 2/5] random,x86: Add arch_get_slow_rng_u64
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
        Paolo Bonzini <pbonzini@redhat.com>, X86 ML <x86@kernel.org>,
        Bandan Das <bsd@redhat.com>, Gleb Natapov <gleb@kernel.org>,
        kvm list <kvm@vger.kernel.org>, "Theodore Ts'o" <tytso@mit.edu>,
        Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
        Daniel Borkmann <dborkman@redhat.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Kees Cook <keescook@chromium.org>
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Sender: linux-kernel-owner@vger.kernel.org

On Jul 16, 2014 4:00 PM, "H. Peter Anvin" <hpa@zytor.com> wrote:
>
> On 07/16/2014 03:40 PM, Andy Lutomirski wrote:
> > On Wed, Jul 16, 2014 at 3:13 PM, Andy Lutomirski <luto@amacapital.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.

I meant that prandom isn't using rdrand for early seeding.

--Andy

>
>         -hpa
>
>
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