[Bug 2004657] [NEW] test_protect_syscall fails on focal-5.15 backports

[Roxana Nicolescu]

Public bug reported:

[SRU Impact]

Sysctl was removed from 5.5 kernels. In src/test/test-seccomp.c, test_protect_syscall
sysctl is called with the expectation the error result is EFAULT and not ENOSYS.
This affects autotests for all focal-5.15 linux kernels (hwe, azure, gcp, oem, gke, oracle).

[Fix]
Assertion checks if either EFAULT or ENOSYS is returned. This way it will work for focal-5.4 kernels and focal-5.15 kernels.

[Test to reproduce the issue]
1. Create a vm and install one of the focal-5.15 kernels (i.e 5.15.0-1029.35~20.04.1 linux-oracle-5.15).
2. Run the autotests for upstream and/or root-unittests:
autopkgtest --test-name=upstream  systemd -- qemu <vm_image>

[Test to verify the fix]
1. Same as above
2. Apply the fix in your local repo and run the tests using your local repo
autopkgtest --test-name=upstream  <path to systemd> -- qemu <vm_image>

[Where problems could occur]
This is not gonna affect end users since it is a change in the test only.
It may impact autotests, but it's a very low probability.

** Affects: systemd (Ubuntu)
     Importance: Medium
         Status: New

** Affects: systemd (Ubuntu Focal)
     Importance: Undecided
         Status: New

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

** Merge proposal linked:
   https://code.launchpad.net/~roxanan/ubuntu/+source/systemd/+git/systemd/+merge/436747

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

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https://bugs.launchpad.net/bugs/2004657

Title:
  test_protect_syscall fails on focal-5.15 backports

Status in systemd package in Ubuntu:
  New
Status in systemd source package in Focal:
  New

Bug description:
  [SRU Impact]

  Sysctl was removed from 5.5 kernels. In src/test/test-seccomp.c, test_protect_syscall
  sysctl is called with the expectation the error result is EFAULT and not ENOSYS.
  This affects autotests for all focal-5.15 linux kernels (hwe, azure, gcp, oem, gke, oracle).

  [Fix]
  Assertion checks if either EFAULT or ENOSYS is returned. This way it will work for focal-5.4 kernels and focal-5.15 kernels.

  [Test to reproduce the issue]
  1. Create a vm and install one of the focal-5.15 kernels (i.e 5.15.0-1029.35~20.04.1 linux-oracle-5.15).
  2. Run the autotests for upstream and/or root-unittests:
  autopkgtest --test-name=upstream  systemd -- qemu <vm_image>

  [Test to verify the fix]
  1. Same as above
  2. Apply the fix in your local repo and run the tests using your local repo
  autopkgtest --test-name=upstream  <path to systemd> -- qemu <vm_image>

  [Where problems could occur]
  This is not gonna affect end users since it is a change in the test only.
  It may impact autotests, but it's a very low probability.

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