From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: Sultan Alsawaf <sultanxda@gmail.com>
Cc: linux-kernel@vger.kernel.org, Jann Horn <jannh@google.com>
Subject: Re: Linux messages full of `random: get_random_u32 called from`
Date: Sun, 29 Apr 2018 16:08:46 -0400 [thread overview]
Message-ID: <20180429200846.GP5965@thunk.org> (raw)
In-Reply-To: <20180429183057.kk666r4z5biamzvs@sultan-box>
On Sun, Apr 29, 2018 at 11:30:57AM -0700, Sultan Alsawaf wrote:
>
> Mind you, this laptop has a 45W CPU, so power savings were definitely not
> considered in its design. Do you have any machines that can provide enough
> boot entropy to satisfy crng init without requiring user-provided entropy?
My 2018 Dell XPS 13 laptop, running "egrep '(random|EXT4)' /var/log/kern.log":
Apr 24 17:05:01 cwcc kernel: [ 0.000000] random: get_random_bytes called from start_kernel+0x83/0x500 with crng_init=0
Apr 24 17:05:01 cwcc kernel: [ 1.363383] random: fast init done
Apr 24 17:05:01 cwcc kernel: [ 3.567432] random: lvm: uninitialized urandom read (4 bytes read)
Apr 24 17:05:01 cwcc kernel: [ 3.593132] random: lvm: uninitialized urandom read (4 bytes read)
Apr 24 17:05:01 cwcc kernel: [ 7.584838] random: cryptsetup: uninitialized urandom read (2 bytes read)
Apr 24 17:05:01 cwcc kernel: [ 7.600685] random: cryptsetup: uninitialized urandom read (2 bytes read)
Apr 24 17:05:01 cwcc kernel: [ 7.803194] random: cryptsetup: uninitialized urandom read (2 bytes read)
Apr 24 17:05:01 cwcc kernel: [ 7.831050] random: lvm: uninitialized urandom read (4 bytes read)
Apr 24 17:05:01 cwcc kernel: [ 7.851884] random: lvm: uninitialized urandom read (4 bytes read)
Apr 24 17:05:01 cwcc kernel: [ 7.875382] random: lvm: uninitialized urandom read (2 bytes read)
Apr 24 17:05:01 cwcc kernel: [ 8.162552] EXT4-fs (dm-1): mounted filesystem with ordered data mode. Opts: (null)
Apr 24 17:05:01 cwcc kernel: [ 8.646497] random: crng init done
- Ted
next prev parent reply other threads:[~2018-04-29 20:08 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-26 4:11 Linux messages full of `random: get_random_u32 called from` Sultan Alsawaf
2018-04-26 5:00 ` Theodore Y. Ts'o
2018-04-26 5:05 ` Sultan Alsawaf
2018-04-26 7:32 ` Theodore Y. Ts'o
2018-04-26 15:17 ` Sultan Alsawaf
2018-04-26 19:25 ` Theodore Y. Ts'o
2018-04-26 20:22 ` Sultan Alsawaf
2018-04-26 20:47 ` Christian Brauner
2018-04-27 0:00 ` Theodore Y. Ts'o
2018-04-27 15:38 ` Jason A. Donenfeld
2018-04-27 19:14 ` Theodore Y. Ts'o
2018-04-26 23:56 ` Theodore Y. Ts'o
2018-04-27 5:20 ` Sultan Alsawaf
2018-04-27 20:10 ` Theodore Y. Ts'o
2018-04-27 22:59 ` Sultan Alsawaf
2018-04-29 14:32 ` Pavel Machek
2018-04-29 17:05 ` Sultan Alsawaf
2018-04-29 18:41 ` Pavel Machek
2018-04-29 20:20 ` Sultan Alsawaf
2018-04-29 21:18 ` Pavel Machek
2018-04-29 21:34 ` Sultan Alsawaf
2018-04-29 22:05 ` Theodore Y. Ts'o
2018-04-29 22:26 ` Sultan Alsawaf
2018-04-29 22:43 ` Jason A. Donenfeld
2018-04-29 22:49 ` Sultan Alsawaf
2018-04-30 0:11 ` Theodore Y. Ts'o
2018-04-30 4:34 ` Sultan Alsawaf
2018-04-30 16:11 ` Theodore Y. Ts'o
2018-05-01 19:53 ` Pavel Machek
2018-04-29 22:43 ` Pavel Machek
2018-04-30 0:32 ` Laura Abbott
2018-04-30 21:12 ` Jeremy Cline
2018-05-01 11:52 ` Justin Forbes
2018-05-01 12:55 ` Theodore Y. Ts'o
2018-05-01 22:35 ` Justin Forbes
2018-05-02 0:02 ` Theodore Y. Ts'o
2018-05-02 12:09 ` Justin Forbes
2018-05-02 16:26 ` Theodore Y. Ts'o
2018-05-02 17:49 ` Laura Abbott
2018-05-02 22:25 ` Theodore Y. Ts'o
2018-05-03 6:19 ` Pavel Machek
2018-05-03 12:23 ` Justin Forbes
2018-05-02 0:43 ` Sultan Alsawaf
2018-05-02 0:56 ` Theodore Y. Ts'o
2018-05-02 1:11 ` Sultan Alsawaf
2018-05-20 3:37 ` [lkp-robot] [Linux messages full of `random] 125bac9e15: stress-ng.chdir.ops_per_sec 38.8% improvement kernel test robot
2018-04-29 18:30 ` Linux messages full of `random: get_random_u32 called from` Sultan Alsawaf
2018-04-29 20:08 ` Theodore Y. Ts'o [this message]
2018-05-18 1:27 ` Trent Piepho
2018-05-18 2:32 ` Theodore Y. Ts'o
2018-05-18 22:56 ` Trent Piepho
2018-05-18 23:22 ` Theodore Y. Ts'o
2018-05-21 18:39 ` Trent Piepho
2018-04-29 14:29 ` Pavel Machek
[not found] <1524676526.3280.40.camel@armitage.org.uk>
2018-04-25 20:28 ` Theodore Y. Ts'o
-- strict thread matches above, loose matches on Subject: below --
2018-04-24 11:48 Paul Menzel
2018-04-24 13:56 ` Theodore Y. Ts'o
2018-04-24 14:30 ` Paul Menzel
2018-04-24 15:49 ` Theodore Y. Ts'o
2018-04-24 15:56 ` Paul Menzel
2018-04-25 7:41 ` Theodore Y. Ts'o
2018-04-26 3:48 ` Paul Menzel
2018-04-29 14:22 ` Pavel Machek
2018-04-29 23:02 ` Dave Jones
2018-04-29 23:07 ` Dave Jones
2018-04-30 0:21 ` Theodore Y. Ts'o
2018-04-26 5:51 ` Pavel Machek
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