[Bug 236926] Re: Prevent Ubuntu against simple DoS attack

[Dieterle]

Still works in 12.04, seems like making some sort of default limit would
be a good idea maybe?

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https://bugs.launchpad.net/bugs/236926

Title:
  Prevent Ubuntu against simple DoS attack

Status in “pam” package in Ubuntu:
  Invalid

Bug description:
  It's very easy freeze whole system using a fork bomb like:

  :(){ :|:& };:

  Solution is adding the line
  *               hard    nproc           512
  to /etc/security/limits.conf
  This should limit all users to 512 process that is more than enough for normal work.
  MacOS X has similiar limitation.

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