From: "H. Peter Anvin" <hpa@zytor.com>
To: Andy Lutomirski <luto@amacapital.net>
Cc: "Theodore Ts'o" <tytso@mit.edu>, kvm list <kvm@vger.kernel.org>,
"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>,
Andrew Honig <ahonig@google.com>
Subject: Re: [PATCH v4 2/5] random: Add and use arch_get_rng_seed
Date: Tue, 22 Jul 2014 14:08:02 -0700 [thread overview]
Message-ID: <53CED2B2.1040401@zytor.com> (raw)
In-Reply-To: <CALCETrV3FHinFXSWJsQjnsXM2H5OyuAbR3_1A401raLes6fNAg@mail.gmail.com>
On 07/22/2014 02:04 PM, Andy Lutomirski wrote:
>
> Just to check: do you mean the RDRAND is very likely to work (i.e.
> arch_get_random_long will return true) or that RDRAND will actually
> reseed several times during initialization?
>
I mean that RDRAND will actually reseed several times during
initialization. The documented architectural limit is actually
extremely conservative.
Either way, it isn't really different from seeding from a VM hosts
/dev/urandom...
-hpa
next prev parent reply other threads:[~2014-07-22 21:08 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-17 18:22 [PATCH v4 0/5] random,x86,kvm: Rework arch RNG seeds and get some from kvm Andy Lutomirski
2014-07-17 18:22 ` [PATCH v4 1/5] x86,kvm: Add MSR_KVM_GET_RNG_SEED and a matching feature bit Andy Lutomirski
2014-07-17 18:22 ` [PATCH v4 2/5] random: Add and use arch_get_rng_seed Andy Lutomirski
2014-07-22 13:59 ` Theodore Ts'o
2014-07-22 20:44 ` Andy Lutomirski
2014-07-22 20:57 ` H. Peter Anvin
2014-07-22 21:04 ` Andy Lutomirski
2014-07-22 21:08 ` H. Peter Anvin [this message]
2014-07-22 21:10 ` Andy Lutomirski
2014-07-22 21:16 ` H. Peter Anvin
2014-07-17 18:22 ` [PATCH v4 3/5] x86,random: Add an x86 implementation of arch_get_rng_seed Andy Lutomirski
2014-07-17 18:22 ` [PATCH v4 4/5] x86,random,kvm: Use KVM_GET_RNG_SEED in arch_get_rng_seed Andy Lutomirski
2014-07-17 18:22 ` [PATCH v4 5/5] x86,kaslr: Use MSR_KVM_GET_RNG_SEED for KASLR if available Andy Lutomirski
2014-07-17 18:48 ` Kees Cook
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