Public bug reported:

[Impact]

unit-tests in noble currently fails because test-execute fails with the
following:

1633s exec-basic.service: Child 1934 belongs to exec-basic.service.
1633s exec-basic.service: Control process exited, code=exited, status=0/SUCCESS 
(success)
1633s exec-basic.service: Got final SIGCHLD for state start-post.
1633s exec-basic.service: Deactivated successfully.
1633s exec-basic.service: Service will not restart (restart setting)
1633s exec-basic.service: Changed start-post -> dead
1633s exec-basic.service: Consumed 49ms CPU time.
1633s Spawning process to nuke 
'/tmp/systemd-private-dbf1f9a2e08f4741900f145a35ce7e30-exec-basic.service-ItwK5c'
1633s Successfully forked off intermediary '(sd-rmrf)' as PID 1936.
1633s Spawning process to nuke 
'/var/tmp/systemd-private-dbf1f9a2e08f4741900f145a35ce7e30-exec-basic.service-V50z4Q'
1633s Successfully forked off intermediary '(sd-rmrf)' as PID 1937.
1633s src/test/test-execute.c:1121:test_exec_basic: exec-basic.service: 
can_unshare=no: exit status 0, expected 226
1633s Skipping PR_SET_MM, as we don't have privileges.
1633s Skipping PR_SET_MM, as we don't have privileges.
1633s (test-execute-unprivileged) terminated by signal ABRT.
1633s Assertion 'r >= 0' failed at src/test/test-execute.c:1412, function 
prepare_ns(). Aborting.
1633s 

[...]

1678s OK: 288 SKIP: 6 FAIL: 1
1679s autopkgtest [20:59:40]: test unit-tests: -----------------------]
1679s autopkgtest [20:59:40]: test unit-tests:  - - - - - - - - - - results - - 
- - - - - - - -
1679s unit-tests           FAIL non-zero exit status 1

This is because some tests in test-execute run unprivileged, and try to
user user namespaces. I fixed this upstream[1], so just backport the
patch so that this test case no longer fails.

[Test Plan]

This only pertains to the unit-tests autopkgtest in systemd. Just check
the result of the autopkgtest run.

[Where problems could occur]

This only changes the test-execute code to skip tests that require
unprivileged userns whenever
kernel.apparmor_restrict_unprivileged_userns=1. Hence, any problems
would be limited to that test case within unit-tests.

[Other information]

Note that the upstream-2 test still has regular failures which need to
be investigated, so this change will not get the systemd autopkgtests
back to green. Since I already fixed this upstream, it is easy to
backport, so it's worth making the incremental improvement for now.

[1]
https://github.com/systemd/systemd/commit/70aece819311f7ab76abdf473bc8f316c5bc58c6

** Affects: systemd (Ubuntu)
     Importance: Undecided
     Assignee: Nick Rosbrook (enr0n)
         Status: Fix Committed

** Affects: systemd (Ubuntu Noble)
     Importance: Medium
     Assignee: Nick Rosbrook (enr0n)
         Status: Triaged


** Tags: systemd-sru-next

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

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

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

** Changed in: systemd (Ubuntu Noble)
     Assignee: (unassigned) => Nick Rosbrook (enr0n)

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

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https://bugs.launchpad.net/bugs/2065964

Title:
  test-execute fails because of apparmor unprivileged userns
  restrictions

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