From: Leo Famulari <leo@famulari.name>
To: "Taylan Ulrich Bayırlı/Kammer" <taylanbayirli@gmail.com>
Cc: 23605@debbugs.gnu.org
Subject: bug#23605: /dev/urandom not seeded across reboots
Date: Tue, 24 May 2016 12:16:17 -0400 [thread overview]
Message-ID: <20160524161617.GC29516@jasmine> (raw)
In-Reply-To: <87shx8j5qm.fsf@T420.taylan>
On Tue, May 24, 2016 at 09:05:21AM +0200, Taylan Ulrich Bayırlı/Kammer wrote:
> Leo Famulari <leo@famulari.name> writes:
> > Does anyone have advice about the service? Am I wrong that we need to
> > seed /dev/urandom to make it work properly?
>
> Yes, this is necessary under Linux if you want urandom to be random
> enough immediately after boot, and all the distros do it as part of
> their init.
>
> There's also an interesting implication here about the very first time
> you boot the system and don't have a urandom seed file from the last
> shutdown yet. I don't know how this is typically handled, given that
> for instance it's quite possible that a user might generate SSH keys
> shortly after their first boot of a system.
When I boot a GuixSD VM for the first time [0], it requires me to dance
on the keyboard until it has collected ~200 bits of entropy. I assumed
this is to properly bootstrap the CSPRNG in /dev/urandom, but I'm not
sure.
[0] I don't remember if I had to do this on bare metal.
next prev parent reply other threads:[~2016-05-24 16:17 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 [this message]
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
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://guix.gnu.org/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20160524161617.GC29516@jasmine \
--to=leo@famulari.name \
--cc=23605@debbugs.gnu.org \
--cc=taylanbayirli@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/guix.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).