[Bug 1564451] Re: User processes are counted towards systemd limit for sshd processes

[Seth Arnold]

** Information type changed from Private Security to Public Security

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Title:
  User processes are counted towards systemd limit for sshd processes

Status in openssh package in Ubuntu:
  New

Bug description:
  When running Xenial, user processes are counted towards the limit for
  the ssh.service, with a limit of 512. So if I login as a normal user
  via ssh and start 512 processes, nobody will be able to login any more
  and even all other users currently logged in will not be able to start
  any new tasks. I'm not certain whether this behaviour is by design,
  but to me it looks like a critical DOS possibility, so tagging as
  security bug.

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