[Bug 1982487] Re: apport fails with PermissionError for dump mode 2 in containers

[Benjamin Drung]

** Changed in: apport
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1982487

Title:
  apport fails with PermissionError for dump mode 2 in containers

Status in Apport:
  Fix Released
Status in apport package in Ubuntu:
  Triaged
Status in apport source package in Focal:
  New
Status in apport source package in Jammy:
  New

Bug description:
  [Impact]

  Apport will fail for processes with dump mode 2 inside of containers.

  [Test plan]

  Run following testcase script inside a LXC container:

  ```
  #!/bin/sh
  sudo rm -rf /var/crash/* /var/log/apport.log

  sudo -u mail sh -c "ping 127.0.0.1 > /dev/null" &
  sleep 0.3
  killall -11 ping

  sleep 0.3
  cat /var/log/apport.log
  ```

  apport.log for the affected version:

  ```
  ERROR: apport (pid 6452) Thu Jul 21 12:59:45 2022: called for pid 6449, signal 11, core limit 0, dump mode 2
  ERROR: apport (pid 6452) Thu Jul 21 12:59:45 2022: not creating core for pid with dump mode of 2
  ERROR: apport (pid 6452) Thu Jul 21 12:59:45 2022: Unhandled exception:
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/apport/report.py", line 681, in add_proc_info
      self["ExecutablePath"] = _read_proc_link(
    File "/usr/lib/python3/dist-packages/apport/report.py", line 92, in _read_proc_link
      return os.readlink(path, dir_fd=dir_fd)
  PermissionError: [Errno 13] Permission denied: 'exe'

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):
    File "/usr/share/apport/apport", line 862, in <module>
      info.add_proc_info(proc_pid_fd=proc_pid_fd)
    File "/usr/lib/python3/dist-packages/apport/report.py", line 686, in add_proc_info
      raise ValueError("not accessible")
  ValueError: not accessible
  ERROR: apport (pid 6452) Thu Jul 21 12:59:45 2022: pid: 6452, uid: 0, gid: 0, euid: 8, egid: 8
  ERROR: apport (pid 6452) Thu Jul 21 12:59:45 2022: environment: environ({'LANG': 'C.UTF-8', 'PATH': '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin', 'LISTEN_PID': '6452', 'LISTEN_FDS': '1', 'LISTEN_FDNAMES': 'connection', 'INVOCATION_ID': '1352c67b4a21480a9b35db8012dafb42', 'JOURNAL_STREAM': '8:29587491', 'SYSTEMD_EXEC_PID': '6452'})
  ```

  The apport log should not show a Traceback.

  [Other Info]

  The autopkgtest for armhf are run inside a LXC container and some test
  cases like test_crash_setuid_drop trigger this bug.

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