[Bug 1795764] [NEW] systemd: core: Fix edge case when processing /proc/self/mountinfo

[Joshua R. Poulson]

Public bug reported:

>From the PR:
Currently, if there are two /proc/self/mountinfo entries with the same
mount point path, the mount setup flags computed for the second of
these two entries will overwrite the mount setup flags computed for
the first of these two entries. This is the root cause of issue #7798.
This patch changes mount_setup_existing_unit to prevent the
just_mounted mount setup flag from being overwritten if it is set to
true. This will allow all mount units created from /proc/self/mountinfo
entries to be initialized properly.

One line fix in https://github.com/systemd/systemd/pull/7811/files

Referenced issue: https://github.com/systemd/systemd/issues/7798

Related kubernetes issue:
https://github.com/kubernetes/kubernetes/issues/57345

systemd v237 has this fix, but we'd like to have it fixed in 16.04.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: Confirmed

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

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https://bugs.launchpad.net/bugs/1795764

Title:
  systemd: core: Fix edge case when processing /proc/self/mountinfo

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  From the PR:
  Currently, if there are two /proc/self/mountinfo entries with the same
  mount point path, the mount setup flags computed for the second of
  these two entries will overwrite the mount setup flags computed for
  the first of these two entries. This is the root cause of issue #7798.
  This patch changes mount_setup_existing_unit to prevent the
  just_mounted mount setup flag from being overwritten if it is set to
  true. This will allow all mount units created from /proc/self/mountinfo
  entries to be initialized properly.

  One line fix in https://github.com/systemd/systemd/pull/7811/files

  Referenced issue: https://github.com/systemd/systemd/issues/7798

  Related kubernetes issue:
  https://github.com/kubernetes/kubernetes/issues/57345

  systemd v237 has this fix, but we'd like to have it fixed in 16.04.

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