[Bug 1206370] Re: subshell that instantly locks up bash, dash, ksh, tcsh, and zsh

[Jamie Strandboge]

Thanks for taking the time to report this bug and helping to make Ubuntu better.  This is not a bug, but rather expected behavior:
https://wiki.ubuntu.com/SecurityTeam/Policies#Unlimited_Local_Resource_Utilization

Please feel free to report any other bugs you may find.

** Information type changed from Public Security to Public

** Changed in: bash (Ubuntu)
       Status: New => Won't Fix

** Changed in: ksh (Ubuntu)
       Status: New => Won't Fix

** Changed in: zsh (Ubuntu)
       Status: New => Won't Fix

** Project changed: dash => ubuntu

** Package changed: ubuntu => dash (Ubuntu)

** Project changed: tcsh => tcsh (Ubuntu)

** Changed in: dash (Ubuntu)
       Status: New => Won't Fix

** Changed in: tcsh (Ubuntu)
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1206370

Title:
  subshell that instantly locks up bash, dash, ksh, tcsh, and zsh

Status in “bash” package in Ubuntu:
  Won't Fix
Status in “dash” package in Ubuntu:
  Won't Fix
Status in “ksh” package in Ubuntu:
  Won't Fix
Status in “tcsh” package in Ubuntu:
  Won't Fix
Status in “zsh” package in Ubuntu:
  Won't Fix

Bug description:
  Type this at a shell prompt in gnome-terminal:

  $ (yes&)
  y
  y
  y
  y
  y
  y
  ...

  Denial of service. Shell becomes totally unresponsive. Subshell
  command is uninterruptible.

  An old one that affects bash, dash, ksh, tcsh, and zsh shells at least
  in all versions in Ubuntu and further back in Ubuntu pre-history too.

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