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

[Dan Streetman]

** Description changed:

+ [impact]
+ 
+ newer kernels introduced a new capability, and existing systemd doesn't
+ have the name mapping for the new cap, 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]
+ 
+ TBD
+ 
+ [scope]
+ 
+ this is needed only in focal (and possibly 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 externally from systemd, with the new capability in the kernel, so this fix technically is needed in x/b/f. However, x is unlikely to get a new kernel capability during the rest of its life cycle.
+ For b, unless a kernel is added that includes a new capability, this patch is not needed.
+ 
+ [original description]
+ 
  When I run `systemctl show myservice.service`, I get the following error
  message:
  
-    Failed to parse bus message: Invalid argument
+    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.

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

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

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

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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:
  New
Status in systemd source package in Focal:
  New

Bug description:
  [impact]

  newer kernels introduced a new capability, and existing systemd
  doesn't have the name mapping for the new cap, 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]

  TBD

  [scope]

  this is needed only in focal (and possibly 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 externally from systemd, with the new capability in the kernel, so this fix technically is needed in x/b/f. However, x is unlikely to get a new kernel capability during the rest of its life cycle.
  For b, unless a kernel is added that includes a new capability, this patch is not needed.

  [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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