[Bug 1709649] Re: 229 backport for race between explicit mount and handling automount

[Éric Hoffman]

Ok, I just tried with this version, and the issue I am seeing sadly does
persist.  So, this does not resolve it.  Please ignore the last comment.


Sorry,
Eric

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  229 backport for  race between explicit mount and handling automount

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[Bug 1709649] Re: 229 backport for race between explicit mount and handling automount

[Éric Hoffman]

Thanks for porting this to Xenial.  Should the Xenial Ubuntu Base
release be updated?  The Ubuntu Base 16.04.3 does come with the
problematic systemd, and on some systems, like the armhf, booting to a
bare rootfs is impossible (always get the issue, which manifest itself
as 'A start job is running for dev-ttys0.device' message and hang pretty
much right after the 1:30 minute delay timeout.

Or, without releasing an Ubuntu Base update, the documentation (Wiki)
probably should include a note on this (i.e. 'To document').  qemu could
be used to update the systemd package, or possibly downloading and
manually updating the newer systemd related files to the extracted
rootfs.

Regards,
Eric

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  229 backport for  race between explicit mount and handling automount

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[Bug 1709649] Re: 229 backport for race between explicit mount and handling automount

[Launchpad Bug Tracker]

This bug was fixed in the package systemd - 229-4ubuntu21.1

---
systemd (229-4ubuntu21.1) xenial-security; urgency=medium

  * SECURITY UPDATE: remote DoS in resolved (LP: #1725351)
- debian/patches/CVE-2017-15908.patch: fix loop on packets with pseudo
  dns types in src/resolve/resolved-dns-packet.c.
- CVE-2017-15908
  * SECURITY UPDATE: access to automounted volumes can lock up
(LP: #1709649)
- debian/patches/CVE-2018-1049.patch: ack automount requests even when
  already mounted in src/core/automount.c.
- CVE-2018-1049

 -- Marc Deslauriers   Thu, 01 Feb 2018
07:42:30 -0500

** Changed in: systemd (Ubuntu Xenial)
   Status: Triaged => Fix Released

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-15908

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-1049

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  229 backport for  race between explicit mount and handling automount

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[Bug 1709649] Re: 229 backport for race between explicit mount and handling automount

[Launchpad Bug Tracker]

This bug was fixed in the package systemd - 232-21ubuntu7

---
systemd (232-21ubuntu7) zesty; urgency=medium

  * networkd: accept `:' in ifnames in systemd/networkd. (LP: #1714933)
  * networkd: add support for ActiveSlave and PrimarySlave netdev options.
(LP: #1709135)
  * Cherrypick upstream fix for a race between .mount and .automount units,
which currently may result in automounts hanging. (LP: #1709649)
  * systemd.postinst: Fix-up version number check in the previous sru.
The version check in the postinst was too tight, thus the SRU fix failed
validation. (LP: #1710410)

systemd (232-21ubuntu6) zesty; urgency=medium

  * link: Fix offload features initialization.
This fixes a regression introduced in v232 which caused TCP
segmentation offloads being disabled by default, resulting in
significant performance issues under certain conditions. (Closes: #864073)
(LP: #1703393)
  * loginctl: Fix loginctl ignoring user given session IDs at command-line
(LP: #1682154)
  * Disable fallback DNS servers.
This causes resolved to call-home to google, attempt to access network when
none is available, and spams logs. (LP: #1449001)
  * initramfs-tools: trigger udevadm add actions with subsystems first.
This updates the initramfs-tools init-top udev script to trigger udevadm
actions with type specified. This mimicks the
systemd-udev-trigger.service. Without type specified only devices are
triggered, but triggering subsystems may also be required and should happen
before triggering the devices. This is the case for example on s390x with 
zdev
generated udev rules. (LP: #1713536)
  * Enable systemd-resolved by default. (LP: #1710410)
  * core: fix systemd failing to serialize tasks correctly on daemon-reload.
(LP: #1702823)

 -- Dimitri John Ledkov   Wed, 04 Oct 2017 14:22:02
+0100

** Changed in: systemd (Ubuntu Zesty)
   Status: Fix Committed => Fix Released

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[Bug 1709649] Re: 229 backport for race between explicit mount and handling automount

[Dimitri John Ledkov]

Reproduced hang with systemd 232-21ubuntu5.

Upgrading to 232-21ubuntu7 resolves the race.


** Tags removed: verification-needed verification-needed-zesty
** Tags added: verification-done verification-done-zesty

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  229 backport for  race between explicit mount and handling automount

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[Bug 1709649] Re: 229 backport for race between explicit mount and handling automount

[Brian Murray]

Hello Pegerto, or anyone else affected,

Accepted systemd into zesty-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/systemd/232-21ubuntu7
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-zesty to verification-done-zesty. If it does not fix
the bug for you, please add a comment stating that, and change the tag
to verification-failed-zesty. In either case, details of your testing
will help us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: systemd (Ubuntu Zesty)
   Status: Triaged => Fix Committed

** Tags added: verification-needed verification-needed-zesty

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Title:
  229 backport for  race between explicit mount and handling automount

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[Bug 1709649] Re: 229 backport for race between explicit mount and handling automount

[Dimitri John Ledkov]

** Description changed:

+ [Impact]
+ In systemd prior to 234 a race exists between .mount and .automount units 
such that automount requests from kernel may not be serviced by systemd 
resulting in kernel holding the mountpoint and any processes that try to use 
said mount will hang. A race like this may lead to denial of service, until 
mount points are unmounted.
+ 
+ [Testcase]
+ Create a race between .mount and .automount units, such that automout request 
is serviced after .mount unit has been started. Observe a hang.
+ More detailed steps are available at 
https://github.com/systemd/systemd/pull/5916
+ 
+ [Butfix]
+ Cherrypick upstream commit 
https://github.com/systemd/systemd/commit/e7d54bf58789545a9eb0b3964233defa0b007318
+ 
+ [Regression Potential]
+ The underlying logic of starting/stopping/triggering units is unchanged. 
However, there the logic as to when to send automout_send_ready() is relaxed, 
such that it is always sent whenever unit is already mounted. This is done to 
explicitly cope with late arrival of the incoming [aircraft] automount request.
+ 
+ [Original Bug report / request]
+ 
  Hi,
  
  We have a blocking issue in systemd for the following release
  
  ```
  NAME="Ubuntu"
  VERSION="16.04.3 LTS (Xenial Xerus)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 16.04.3 LTS"
  VERSION_ID="16.04"
  HOME_URL="http://www.ubuntu.com/;
  SUPPORT_URL="http://help.ubuntu.com/;
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/;
  VERSION_CODENAME=xenial
  UBUNTU_CODENAME=xenial
  ```
  
  This release runs systemd229, we are affected by the following auto-
  mouting race condition
  
  ```
  https://github.com/systemd/systemd/pull/5916
  ```
  
  Is back porting  the fix to the release 229 an option?
  
  Regards.

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[Bug 1709649] Re: 229 backport for race between explicit mount and handling automount

[Dimitri John Ledkov]

Artful has this change already.
Zesty and Xenial need this cherry-pick.

** Also affects: systemd (Ubuntu Zesty)
   Importance: Undecided
   Status: New

** Also affects: systemd (Ubuntu Artful)
   Importance: Undecided
   Status: Confirmed

** Changed in: systemd (Ubuntu Artful)
   Status: Confirmed => Fix Released

** Changed in: systemd (Ubuntu Zesty)
   Status: New => Triaged

** Changed in: systemd (Ubuntu Xenial)
   Status: Confirmed => Triaged

** Changed in: systemd (Ubuntu Zesty)
   Importance: Undecided => Medium

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[Bug 1709649] Re: 229 backport for race between explicit mount and handling automount

[Dimitri John Ledkov]

** Also affects: systemd (Ubuntu Xenial)
   Importance: Undecided
   Status: New

** Changed in: systemd (Ubuntu Xenial)
   Importance: Undecided => High

** Changed in: systemd (Ubuntu Xenial)
   Status: New => Confirmed

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[Bug 1709649] Re: 229 backport for race between explicit mount and handling automount

[Lars Müller-Gilberger]

Hi Dimitri,

We are affected by that,too.
We have no advantage support. 
We have multiple server parks with 3000+ Ubuntu machines.

We sees this this bug triggering especially, if some
program/container/pod is using auto mount directly after startup.

We worked around this issue by manually patching, but this is not a
great solution, as you can guess.

Is there any expectation when the MR above will be back ported or a new
systemd release, which is including the fix will be issued ?

Best Regards
Lars

** Attachment added: "ubuntu-bug systemd"
   
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1709649/+attachment/4932733/+files/apport.systemd.af72r96i.apport

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[Bug 1709649] Re: 229 backport for race between explicit mount and handling automount

[Dimitri John Ledkov]

There is no time commitment for this request.

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[Bug 1709649] Re: 229 backport for race between explicit mount and handling automount

[Dimitri John Ledkov]

When you say "we" - who do you mean? Do you per chance have Ubuntu
Advantage and/or any other support contracts? If that is the case,
please note, you must use UA portal to escalate issues.

Please note the bug report is incomplete w.r.t. infomration of the affected 
systems. Please use
$ ubuntu-bug systemd
To collect and file complete bug reports.

Nonetheless I can check the mentioned pull requests, and assess if it is
applicable for an SRU.

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[Bug 1709649] Re: 229 backport for race between explicit mount and handling automount

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: systemd (Ubuntu)
   Status: New => Confirmed

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