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[Martin Pitt <martin.pitt@xxxxxxxxxx>]

That initial fix just changed a DoS through assert() into a DoS through
fd exhaustion. This is being handled in
https://github.com/systemd/systemd/pull/4242 .

Please let's handle this upstream first and not put out another USN in
haste -- after all, this is just a local DoS, so far from being a
catastrophe (you can DoS the machine as user in lots of other ways).

** Changed in: systemd (Ubuntu Xenial)
       Status: Fix Released => In Progress

** Changed in: systemd (Ubuntu Yakkety)
       Status: Fix Committed => In Progress

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https://bugs.launchpad.net/bugs/1628687

Title:
  Assertion failure when PID 1 receives a zero-length message over
  notify socket

Status in systemd:
  New
Status in systemd package in Ubuntu:
  In Progress
Status in systemd source package in Xenial:
  In Progress
Status in systemd source package in Yakkety:
  In Progress

Bug description:
  Environment:

  Xenial 16.04.1
  Amd64

  Description.

  Systemd fails an assertion in manager_invoke_notify_message when a
  zero-length message is received over /run/systemd/notify. This allows
  a local user to perform a denial-of-service attack against PID 1.

  How to trigger the bug:

  $ while true; do NOTIFY_SOCKET=/run/systemd/notify systemd-notify "";
  done

  The following entries are written into /var/log/syslog, at this point
  systemd is crashed.

  Sep 28 20:57:20 ubuntu systemd[1]: Started User Manager for UID 1000.
  Sep 28 20:57:28 ubuntu systemd[1]: Assertion 'n > 0' failed at ../src/core/manager.c:1501, function manager_invoke_notify_message(). Aborting.
  Sep 28 20:57:29 ubuntu systemd[1]: Caught <ABRT>, dumped core as pid 1307.
  Sep 28 20:57:29 ubuntu systemd[1]: Freezing execution.

  
  Public bug: https://github.com/systemd/systemd/issues/4234

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