[Bug 1905245] Re: "Failed to parse bus message: Invalid argument" with Linux 5.8

[Chris Halse Rogers]

Hello Gary, or anyone else affected,

Accepted systemd into bionic-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/systemd/237-3ubuntu10.44 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, what testing has been
performed on the package and change the tag from verification-needed-
bionic to verification-done-bionic. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-bionic. In either case, without details of your testing we will
not be able to proceed.

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

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: systemd (Ubuntu Bionic)
       Status: In Progress => Fix Committed

** Tags added: verification-needed-bionic

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https://bugs.launchpad.net/bugs/1905245

Title:
  "Failed to parse bus message: Invalid argument" with Linux 5.8

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Bionic:
  Fix Committed
Status in systemd source package in Focal:
  Fix Committed

Bug description:
  [impact]

  newer kernels introduced a new capability, and existing systemd
  doesn't have the name mapping for the new cap (since the mapping table
  is generated at systemd compile time), so it fails when trying to map
  the capability to a user-facing name, which causes failure when
  running commands like 'systemctl show'

  [test case]

  install a focal system, and install the 5.8 (or newer) kernel, e.g.
  from linux-generic-hwe-20.04-edge, and reboot into the new kernel.

  Find any service that does not specify its CapabilityBoundingSet; e.g.
  'apparmor', and run systemctl show on it:

  ubuntu at lp1905245-f:~$ systemctl show -p CapabilityBoundingSet apparmor
  Failed to parse bus message: Invalid argument

  the command should correctly show the value, e.g.:
  $ systemctl show -p CapabilityBoundingSet apparmor
  CapabilityBoundingSet=cap_chown cap_dac_override ...etc...

  [regression potential]

  a regression would likely occur while systemd is parsing or printing
  or otherwise handling kernel capabilities. A regression could happen
  when running systemd commands, such as systemctl, or when pid1 is
  managing services.

  [scope]

  this is needed only in focal and bionic.

  This is fixed upstream by PR 16424:
  https://github.com/systemd/systemd/pull/16424
  which was first included in v246, so this is already fixed in groovy and later.

  This was introduced upstream in systemd by commit
  52610b020c077ee769c6923249f7e6c4e99d2980 which was first included in
  v235, so this bug does not exist in Xenial.

  This bug will reproduce on any system running under the 5.8 kernel,
  with the new capability, if the systemd binary was compiled with
  kernel headers that do not include the new capability. This means this
  is reproducable on bare-metal/vm instances running 5.8, as well as
  containers on hosts running 5.8. Therefore, while bionic may not ever
  receive a new kernel with added capability, it still needs to be
  patched to avoid the bug on a bionic container running on a host with
  the 5.8 kernel.

  [other info]

  there is a testcase-only related bug 1905044

  [original description]

  When I run `systemctl show myservice.service`, I get the following
  error message:

     Failed to parse bus message: Invalid argument

  systemd version: 245.4-4ubuntu3.3
  linux version: 5.8.0-29-generic #31~20.04.1-Ubuntu  (From linux-generic-hwe-20.04-edge)

  This is a bug that has been fixed in Debian. See
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=964926

  Please can we port the fix to the ubuntu 20.04 version.

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