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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

  reply	other threads:[~2018-04-29 20:08 UTC|newest]

Thread overview: 65+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-26  4:11 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
2018-04-29 18:30                   ` 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
  -- 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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