From: Rusty Russell <rusty@rustcorp.com.au>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: virtualization@lists.linux-foundation.org,
Jeff Garzik <jeff@garzik.org>,
Herbert Xu <herbert@gondor.apana.org.au>,
Christian Borntraeger <borntraeger@de.ibm.com>,
LKML <linux-kernel@vger.kernel.org>, "H. Anvin" <hpa@zytor.com>,
Theodore Tso <tytso@mit.edu>, Matt Mackall <mpm@selenic.com>
Subject: Re: [PATCH 2/2] lguest: virtio-rng support
Date: Sat, 17 May 2008 14:46:39 +1000 [thread overview]
Message-ID: <200805171446.39814.rusty@rustcorp.com.au> (raw)
In-Reply-To: <1210934981.6381.1.camel@johannes.berg>
On Friday 16 May 2008 20:49:41 Johannes Berg wrote:
> > +
> > +/* Our random number generator device reads from /dev/urandom into the Guest's
> > + * input buffers. The usual case is that the Guest doesn't want random numbers
> > + * and so has no buffers although /dev/urandom is still readable, whereas
> > + * console is the reverse.
>
> Is it really a good idea to use the hosts /dev/urandom to fill the
> guests /dev/random?
Technically it's up to rngd in the guest to decide whether to feed entropy
or not (ie. /dev/urandom or /dev/random).
If we use /dev/random in the host, we risk a DoS. But since /dev/random
is 0666 on my system, perhaps noone actually cares?
Cheers,
Rusty.
next prev parent reply other threads:[~2008-05-17 4:47 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-15 18:48 Virt RNG? Jeff Garzik
2008-05-15 19:53 ` Jeremy Fitzhardinge
2008-05-15 20:26 ` Dor Laor
2008-05-15 20:31 ` Christian Borntraeger
2008-05-15 20:44 ` Jeff Garzik
2008-05-15 20:43 ` Jeff Dike
2008-05-15 23:43 ` Rusty Russell
2008-05-16 0:07 ` Henrique de Moraes Holschuh
2008-05-16 5:31 ` [PATCH 1/2] virtio: hardware random device Rusty Russell
2008-05-16 5:39 ` [PATCH 2/2] lguest: virtio-rng support Rusty Russell
2008-05-16 10:49 ` Johannes Berg
2008-05-16 20:25 ` H. Peter Anvin
2008-05-17 4:46 ` Rusty Russell [this message]
2008-05-17 4:50 ` H. Peter Anvin
2008-05-17 6:28 ` Rusty Russell
2008-05-17 6:43 ` Herbert Xu
2008-05-17 7:43 ` Christian Borntraeger
2008-05-17 15:56 ` H. Peter Anvin
2008-05-17 7:47 ` Jeremy Fitzhardinge
2008-05-19 9:05 ` Rusty Russell
2008-05-19 9:10 ` Jeremy Fitzhardinge
2008-05-19 9:28 ` Rusty Russell
2008-05-19 9:45 ` Jeremy Fitzhardinge
2008-05-17 15:57 ` H. Peter Anvin
2008-05-16 7:31 ` [PATCH 1/2] virtio: hardware random device Christian Borntraeger
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