From: tytso@mit.edu
To: Andy Lutomirski <luto@amacapital.net>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
kvm list <kvm@vger.kernel.org>,
Florian Weimer <fweimer@redhat.com>, Kees Cook <kees@outflux.net>
Subject: Re: random: Providing a seed value to VM guests
Date: Thu, 1 May 2014 20:39:10 +0000 [thread overview]
Message-ID: <20140501203910.GB25829@thunk.org> (raw)
In-Reply-To: <CALCETrV1HUA-JRAj9UicD3woqec7mSJLoT9CkQq=dOCpdPg4hw@mail.gmail.com>
On Thu, May 01, 2014 at 01:32:55PM -0700, Andy Lutomirski wrote:
> On Thu, May 1, 2014 at 1:30 PM, H. Peter Anvin <hpa@zytor.com> wrote:
> > RDSEED is not synchronous. It is, however, nonblocking.
>
> What I mean is: IIUC it's reasonable to call RDSEED a few times in a
> loop and hope it works. It makes no sense to do that with
> /dev/random.
RDSEED is allowed to return an error if there is insufficient entropy.
So long as the caller understands that this is an emulated
instruction, I don't see a problem.
- Ted
next prev parent reply other threads:[~2014-05-01 20:39 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-01 19:02 random: Providing a seed value to VM guests Andy Lutomirski
2014-05-01 19:26 ` tytso
2014-05-01 19:40 ` H. Peter Anvin
2014-05-01 20:16 ` Andy Lutomirski
2014-05-01 20:30 ` H. Peter Anvin
2014-05-01 20:32 ` Andy Lutomirski
2014-05-01 20:39 ` tytso [this message]
2014-05-01 20:56 ` Andy Lutomirski
2014-05-01 21:01 ` H. Peter Anvin
2014-05-01 21:06 ` Andy Lutomirski
2014-05-01 22:28 ` tytso
2014-05-01 22:32 ` Andy Lutomirski
2014-05-01 22:46 ` H. Peter Anvin
2014-05-01 22:56 ` Andy Lutomirski
2014-05-01 23:00 ` H. Peter Anvin
2014-05-01 19:41 ` H. Peter Anvin
-- strict thread matches above, loose matches on Subject: below --
2014-04-28 19:52 [PATCH] random: Add "initialized" variable to proc Florian Weimer
2014-04-28 21:41 ` Theodore Ts'o
2014-04-29 17:51 ` Florian Weimer
2014-04-29 18:26 ` Theodore Ts'o
2014-04-30 20:52 ` Andy Lutomirski
2014-05-01 2:06 ` Theodore Ts'o
2014-05-01 4:05 ` H. Peter Anvin
2014-05-01 15:05 ` tytso
2014-05-01 15:35 ` Andy Lutomirski
2014-05-01 18:53 ` Andy Lutomirski
2014-05-01 18:59 ` random: Providing a seed value to VM guests H. Peter Anvin
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