From: ludo@gnu.org (Ludovic Courtès)
To: Leo Famulari <leo@famulari.name>
Cc: 23605@debbugs.gnu.org
Subject: bug#23605: /dev/urandom not seeded across reboots
Date: Sat, 28 May 2016 15:51:58 +0200 [thread overview]
Message-ID: <87inxymgsh.fsf@gnu.org> (raw)
In-Reply-To: <20160528011201.GA1753@jasmine> (Leo Famulari's message of "Fri, 27 May 2016 21:12:01 -0400")
Leo Famulari <leo@famulari.name> skribis:
> 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.
You’re right, sorry for the confusion.
Ludo’.
next prev parent reply other threads:[~2016-05-28 13:53 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
2016-05-28 13:51 ` Ludovic Courtès [this message]
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=87inxymgsh.fsf@gnu.org \
--to=ludo@gnu.org \
--cc=23605@debbugs.gnu.org \
--cc=leo@famulari.name \
/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).