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From: Leo Famulari <leo@famulari.name>
To: "Ludovic Courtès" <ludo@gnu.org>
Cc: 23605@debbugs.gnu.org
Subject: bug#23605: /dev/urandom not seeded across reboots
Date: Fri, 27 May 2016 21:12:01 -0400	[thread overview]
Message-ID: <20160528011201.GA1753@jasmine> (raw)
In-Reply-To: <87d1obabj8.fsf@gnu.org>

On Tue, May 24, 2016 at 02:24:59PM +0200, Ludovic Courtès wrote:
> Leo Famulari <leo@famulari.name> skribis:
> 
> > I realized that we don't seem to be saving any of the entropy in the
> > kernel's random pool [0] across reboots.
> >
> > This means that for some period after boot, /dev/urandom may not be safe
> > to use. From random(4):
> 
> Good catch!
> 
> Some comments:
> 
> > +(define %urandom-seed-activation
> > +  ;; Activation gexp for the urandom seed
> > +  #~(begin
> > +      (use-modules (guix build utils))
> > +
> > +      (mkdir-p "/var/run")
> > +      (close-port (open-file "/var/run/urandom-seed" "a0b"))
> 
> Or simply ‘open-output-file’.

I don't see a way to use (open-output-file) in "append" mode as with
(open-file).  Without that, the file is cleared before it is read in the
following lines.

  parent reply	other threads:[~2016-05-28  1:13 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-23 17:58 bug#23605: /dev/urandom not seeded across reboots Leo Famulari
2016-05-24  7:05 ` Taylan Ulrich Bayırlı/Kammer
2016-05-24 16:16   ` Leo Famulari
2016-05-24 16:26     ` Thompson, David
2016-05-24 17:23       ` Leo Famulari
2016-05-24 17:29         ` Thompson, David
2016-05-25 21:53       ` Ludovic Courtès
2016-05-24 12:24 ` Ludovic Courtès
2016-05-25 16:38   ` Leo Famulari
2016-05-25 16:54     ` Ludovic Courtès
2016-05-26 16:47       ` Leo Famulari
2016-05-28 13:57         ` Ludovic Courtès
2016-05-28 18:05           ` Leo Famulari
2016-05-28 18:10             ` Leo Famulari
2016-05-28 18:26             ` Leo Famulari
2016-05-28 20:41               ` Leo Famulari
2016-05-28 20:53             ` Ludovic Courtès
2016-05-29  0:00               ` Leo Famulari
2016-05-29  0:04                 ` Leo Famulari
2016-05-29 20:23                 ` Ludovic Courtès
2016-05-28  1:12   ` Leo Famulari [this message]
2016-05-28 13:51     ` Ludovic Courtès
2016-05-28  1:05 ` Leo Famulari
2016-05-28  1:11   ` Ben Woodcroft
2016-05-28  1:45     ` Leo Famulari
2016-05-28  9:40       ` Ben Woodcroft

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