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Groups > linux.debian.bugs.dist > #896467
| From | Ben Caradoc-Davies <ben@transient.nz> |
|---|---|
| Newsgroups | linux.debian.bugs.dist, linux.debian.kernel |
| Subject | Bug#897572: plymouth: long delay before splashscreen with kernel 4.16 |
| Date | 2018-05-07 02:50 +0200 |
| Message-ID | <vMCvL-2h0-1@gated-at.bofh.it> (permalink) |
| References | <vMglz-4zA-3@gated-at.bofh.it> <vMlEC-89j-1@gated-at.bofh.it> <vLbR0-2oY-1@gated-at.bofh.it> <vMlEC-89j-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Cross-posted to 2 groups.
Ben,
even though X is not involved, you are right on the money about this
being caused by waiting for random bits. This is a kernel bug caused by
urandom blocking when it should not. I will merge the issues when I have
my final patch ready.
You can see the "random: plymouthd: uninitialized urandom read" warning
in my screen photo:
https://bugs.debian.org/cgi-bin/bugreport.cgi?att=1;bug=897572;filename=img_20180504_120059.jpg;msg=37
This bug is introduced by the "crng_init > 0" to "crng_init > 1" change
in this commit:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=43838a23a05fbd13e47d750d3dfd77001536dd33
This change inadvertently impacts urandom_read, causing the crng_init==1
state to be treated as uninitialized and causing urandom to block,
despite this state existing *specifically* to support non-cryptographic
needs at boot time:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/char/random.c#n1863
Reverting 43838a23a05f ("random: fix crng_ready() test") fixes the bug
(tested with 4.16.5-1), but this may cause security concerns
(CVE-2018-1108 is mentioned in 43838a23a05f). I am testing a more
localised fix that should be more palatable to upstream.
Kind regards,
--
Ben Caradoc-Davies <ben@transient.nz>
Director
Transient Software Limited <https://transient.nz/>
New Zealand
Back to linux.debian.bugs.dist | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
Bug#897572: linux-image-4.16.0-1-amd64 breaks plymouth LUKS prompt (missing Kaby Lake firmware?) Ben Caradoc-Davies <ben@transient.nz> - 2018-05-03 04:10 +0200
Bug#897572: linux-image-4.16.0-1-amd64 breaks plymouth LUKS prompt Ben Caradoc-Davies <ben@transient.nz> - 2018-05-03 06:50 +0200
Bug#897572: linux-image-4.16.0-1-amd64 breaks plymouth LUKS prompt Ben Caradoc-Davies <ben@transient.nz> - 2018-05-03 07:30 +0200
Bug#897572: linux-image-4.16.0-1-amd64 breaks plymouth LUKS prompt Ben Caradoc-Davies <ben@transient.nz> - 2018-05-03 07:40 +0200
Bug#897572: linux-image-4.16.0-1-amd64 breaks plymouth LUKS prompt Ben Caradoc-Davies <ben@transient.nz> - 2018-05-04 01:40 +0200
Bug#897572: linux-image-4.16.0-1-amd64 breaks plymouth LUKS prompt Ben Caradoc-Davies <ben@transient.nz> - 2018-05-04 02:00 +0200
Bug#897572: linux-image-4.16.0-1-amd64 breaks plymouth LUKS prompt Ben Hutchings <ben@decadent.org.uk> - 2018-05-05 21:10 +0200
Bug#897572: linux-image-4.16.0-1-amd64 breaks plymouth LUKS prompt Ben Caradoc-Davies <ben@transient.nz> - 2018-05-06 02:40 +0200
Bug#897572: linux-image-4.16.0-1-amd64 breaks plymouth LUKS prompt Ben Hutchings <ben@decadent.org.uk> - 2018-05-06 05:10 +0200
Bug#897572: linux-image-4.16.0-1-amd64 breaks plymouth LUKS prompt Laurent Bigonville <bigon@debian.org> - 2018-05-06 17:30 +0200
Bug#897572: linux-image-4.16.0-1-amd64 breaks plymouth LUKS prompt Ben Hutchings <ben@decadent.org.uk> - 2018-05-06 19:50 +0200
Bug#897572: plymouth: long delay before splashscreen with kernel 4.16 Ben Caradoc-Davies <ben@transient.nz> - 2018-05-06 03:10 +0200
Bug#897958: plymouth: long delay before splashscreen with kernel 4.16 Arnaud Meyer <arnaudmeyer@gmx.com> - 2018-05-06 05:30 +0200
Bug#897572: plymouth: long delay before splashscreen with kernel 4.16 at46 <at46n@t-online.de> - 2018-05-06 08:50 +0200
Bug#897572: plymouth: long delay before splashscreen with kernel 4.16 Ben Caradoc-Davies <ben@transient.nz> - 2018-05-07 02:50 +0200
Bug#897958: plymouth: long delay before splashscreen with kernel 4.16 Ben Caradoc-Davies <ben@transient.nz> - 2018-05-07 04:10 +0200
Bug#897572: Eric Mill <eric@konklone.com> - 2018-05-06 19:30 +0200
Bug#897572: [PATCH] Revert "random: fix crng_ready() test" Ben Caradoc-Davies <ben@transient.nz> - 2018-05-07 05:10 +0200
Bug#897572: [PATCH] Revert "random: fix crng_ready() test" "Theodore Y. Ts'o" <tytso@mit.edu> - 2018-05-07 06:20 +0200
Bug#897572: [PATCH] Revert "random: fix crng_ready() test" Ben Caradoc-Davies <ben@transient.nz> - 2018-05-07 05:50 +0200
Bug#897572: [PATCH] Revert "random: fix crng_ready() test" "Theodore Y. Ts'o" <tytso@mit.edu> - 2018-05-07 06:20 +0200
Bug#897572: urandom hang in early boot Laurent Bigonville <bigon@debian.org> - 2018-05-07 19:40 +0200
Bug#897572: urandom hang in early boot Ben Caradoc-Davies <ben@transient.nz> - 2018-05-08 01:20 +0200
Bug#897572: urandom hang in early boot Ben Hutchings <ben@decadent.org.uk> - 2018-05-08 04:10 +0200
Bug#897572: urandom hang in early boot Ben Caradoc-Davies <ben@transient.nz> - 2018-05-08 06:00 +0200
Bug#897572: urandom hang in early boot Ben Caradoc-Davies <ben@transient.nz> - 2018-05-08 07:00 +0200
Bug#897572: urandom hang in early boot Bjørn Mork <bjorn@mork.no> - 2018-05-08 13:40 +0200
Bug#897572: urandom hang in early boot Yves-Alexis Perez <corsac@debian.org> - 2018-05-09 18:40 +0200
Bug#897572: getrandom hang in early boot prevents plymouth passphrase entry Esokrates <esokrarkose@gmail.com> - 2018-05-09 11:00 +0200
Bug#897572: [PATCH] Copy fontconfig .uuid files to avoid getrandom hang in early boot Ben Caradoc-Davies <ben@transient.nz> - 2018-05-10 02:00 +0200
Bug#897572: [PATCH] Copy fontconfig .uuid files to avoid getrandom hang in early boot Laurent Bigonville <bigon@debian.org> - 2018-05-14 10:30 +0200
Bug#897572: [PATCH] Copy fontconfig .uuid files to avoid getrandom hang in early boot Ben Caradoc-Davies <ben@transient.nz> - 2018-05-15 08:00 +0200
Bug#897572: getrandom hang in early boot prevents plymouth passphrase entry Ben Caradoc-Davies <ben@transient.nz> - 2018-05-10 02:50 +0200
Bug#897572: getrandom hang in early boot prevents plymouth passphrase entry "Theodore Y. Ts'o" <tytso@mit.edu> - 2018-05-10 04:00 +0200
Bug#897572: getrandom hang in early boot prevents plymouth passphrase entry Ben Caradoc-Davies <ben@transient.nz> - 2018-05-10 04:40 +0200
Bug#897572: getrandom hang in early boot prevents plymouth passphrase entry Laurent Bigonville <bigon@debian.org> - 2018-05-10 11:50 +0200
Bug#897572: getrandom hang in early boot prevents plymouth passphrase entry Yves-Alexis Perez <corsac@debian.org> - 2018-05-10 12:50 +0200
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