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[Launchpad Bug Tracker <1618188@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 234-2ubuntu12.3

---------------
systemd (234-2ubuntu12.3) artful; urgency=medium

  [ Dimitri John Ledkov ]
  * Fix test-functions failing with Ubuntu units. LP: #1750608
  * tests: switch to using ext4 by default, instead of ext3. LP: #1750608
  * Fix kdump service not starting, due to systemd not loading dropins.
    Cherrypick a fix from upstream. (LP: #1708409)
  * systemd-fsckd: Fix ADT tests to work on s390x too. (LP: #1736955)
  * netwokrd: add support for RequiredForOnline stanza. (LP: #1737570)
  * resolved.service: set DefaultDependencies=no (LP: #1734167)
  * systemd.postinst: enable persistent journal. (LP: #1618188)
  * core: add support for non-writable unified cgroup hierarchy for container support.
    Rebase and de-fuzz. (LP: #1734410)
  * Prevent MemoryDenyWriteExecution policy bypass, by disallowing pkey_mprotect when mprotect is disallowed.
    CVE-2017-15908 (LP: #1725348)
  * networkd: enable promote_secondaries on networkd managed dhcp links.
    This fixes failing to renew DHCP lease, on networkd managed devices.
    (LP: #1721223)

  [ Kleber Sacilotto de Souza ]
  * systemd-rfkill service times out when a new rfkill device is added
    - rfkill-fix-erroneous-behavior-when-polling-the-udev-.patch: Comparing
    udev_device_get_sysname(device) and sysname will always return true. We need to
    check the device received from udev monitor instead.
    - rfkill-fix-typo.patch: Fix typo in rfkill log message. (LP: #1734908)

 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>  Tue, 20 Feb 2018 16:11:58
+0000

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

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

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https://bugs.launchpad.net/bugs/1618188

Title:
  systemd journal should be persistent by default: /var/log/journal
  should be created

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  In Progress
Status in systemd source package in Zesty:
  Won't Fix
Status in systemd source package in Artful:
  Fix Released
Status in systemd source package in Bionic:
  Fix Released

Bug description:
  [Impact]

   * System logs are lost across reboots because they are not stored
  persistently.

  [Test Case]

   * Fresh installations, or upgrades to this version of systemd, should create /var/log/journal and trigger automatic persistent logs.
   * Users may choose to remove said directory, or disable persistent logging in /etc/systemd/journald.conf

  [Regression Potential]

   * Persistent logging by default will cause logs to be flushed from
  /run to /var/log, meaning there will be less RAM used (/run is tmpfs
  backed), but increased disk usage (in /var/log). The journald daemon
  has limits set for logs, meaning they will be rotated and discarded
  and should not cause out of disk-space errors.

  [Other Info]
   
   * Original bug report

  After upgrading 14.04 -> 16.04, key services are now running on
  systemd and using the systemd journal for logging. In 14.04, key
  system logs like /var/log/messages and /var/log/syslog were
  persistent, but after the upgrade to 16.04 there has a been a
  regression of sorts: Logs sent to systemd's journald are now being
  thrown away during reboots.

  This behavior is controlled by the `Storage=` option in
  `/etc/systemd/journald.conf`. The default setting is `Storage=auto`
  which will persist logs in `/var/log/journal/`, *only if the directory
  already exists*. But the directory was not created as part of the
  14.04 -> 16.04 upgrade, so logging was being lost for a while before I
  realized what was happening.

  This issue could be solved by either creating /var/log/journal or
  changing the default Storage behavior to `Storage=persistent`, which
  would create the directory if need be.

  ## Related reference

   * `systemd` currently compounds the issue by having ["journal --disk-usage" report memory usage as disk usage](https://github.com/systemd/systemd/issues/4059), giving the impression that the disk is being used for logging when it isn't.
   * [User wonders where to find logs from previous boots, unaware that the logs were thrown away](http://askubuntu.com/questions/765315/how-to-find-previous-boot-log-after-ubuntu-16-04-restarts)

  ## Recommended fix

  Restoring persistent logging as the default is recommended.

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