From: "H. Peter Anvin" <hpa@zytor.com>
To: Andy Lutomirski <luto@amacapital.net>
Cc: kvm list <kvm@vger.kernel.org>, "Theodore Ts'o" <tytso@mit.edu>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Kees Cook <keescook@chromium.org>, X86 ML <x86@kernel.org>,
Daniel Borkmann <dborkman@redhat.com>,
Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
Gleb Natapov <gleb@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>, Bandan Das <bsd@redhat.com>
Subject: Re: [PATCH v3 2/5] random,x86: Add arch_get_slow_rng_u64
Date: Wed, 16 Jul 2014 15:59:57 -0700 [thread overview]
Message-ID: <53C703ED.2010605@zytor.com> (raw)
In-Reply-To: <CALCETrVCrJEwYokasRoqQTKJWKtzq9XUMNqHoT4-ZjgyZ-mBow@mail.gmail.com>
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.
-hpa
next prev parent reply other threads:[~2014-07-16 22:59 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-16 21:45 [PATCH v3 0/5] random,x86,kvm: Add and use MSR_KVM_GET_RNG_SEED Andy Lutomirski
2014-07-16 21:45 ` [PATCH v3 1/5] x86,kvm: Add MSR_KVM_GET_RNG_SEED and a matching feature bit Andy Lutomirski
2014-07-17 17:43 ` Andrew Honig
2014-07-17 17:45 ` Andy Lutomirski
2014-07-16 21:45 ` [PATCH v3 2/5] random,x86: Add arch_get_slow_rng_u64 Andy Lutomirski
2014-07-16 21:59 ` H. Peter Anvin
2014-07-16 22:13 ` Andy Lutomirski
2014-07-16 22:40 ` Andy Lutomirski
2014-07-16 22:59 ` H. Peter Anvin [this message]
2014-07-17 0:03 ` Andy Lutomirski
2014-07-17 4:55 ` H. Peter Anvin
2014-07-17 10:33 ` Theodore Ts'o
2014-07-17 16:39 ` H. Peter Anvin
2014-07-17 17:12 ` Andy Lutomirski
2014-07-17 17:32 ` Theodore Ts'o
2014-07-17 17:34 ` Andy Lutomirski
2014-07-17 18:42 ` Hannes Frederic Sowa
2014-07-17 19:15 ` Andy Lutomirski
2014-07-17 12:39 ` Daniel Borkmann
2014-07-16 21:45 ` [PATCH v3 3/5] random: Seed pools from arch_get_slow_rng_u64 at startup Andy Lutomirski
2014-07-16 21:45 ` [PATCH v3 4/5] random: Log how many bits we managed to seed with in init_std_data Andy Lutomirski
2014-07-16 21:45 ` [PATCH v3 5/5] x86,kaslr: Use MSR_KVM_GET_RNG_SEED for KASLR if available Andy Lutomirski
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