[Bug 1690820] Re: killing su does not kill subprocess (SIGTERM not propagated)

[Serge Hallyn]

Thanks for filing, Radu.

The commit which fixed it is in this PR:

https://github.com/shadow-maint/shadow/pull/72

(wget https://github.com/shadow-maint/shadow/pull/72.patch)

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https://bugs.launchpad.net/bugs/1690820

Title:
  killing su does not kill subprocess (SIGTERM not propagated)

Status in shadow package in Ubuntu:
  New

Bug description:
  Problem first appeared in login_4.1.5.1-1ubuntu9.4 and version
  login_4.1.5.1-1ubuntu9.2 was not affected.


  
  Example where the subprocess 115576 has not been terminated:
  root at ubuntu:~/sudebug/src/shadow-4.1.5.1/src# pkill sleep; ./su test -c 'sleep 9999'&
  [1] 115575
  root at ubuntu:~/sudebug/src/shadow-4.1.5.1/src# kill $!
  root at ubuntu:~/sudebug/src/shadow-4.1.5.1/src#  ...waiting for child to terminate.
  pgrep sleep
  115576
  [1]+  Exit 255                ./su test -c 'sleep 9999'
  root at ubuntu:~/sudebug/src/shadow-4.1.5.1/src# pgrep sleep
  115576

  Expected behavior:
  root at ubuntu:~/sudebug/src/shadow-4.1.5.1/src# pkill sleep; ./su test -c 'sleep 9999' &
  [1] 115503
  root at ubuntu:~/sudebug/src/shadow-4.1.5.1/src# kill $!
  root at ubuntu:~/sudebug/src/shadow-4.1.5.1/src#
  Session terminated, terminating shell... ...terminated.
   ...terminated.

  [1]+  Exit 143                ./su test -c 'sleep 9999'
  root at ubuntu:~/sudebug/src/shadow-4.1.5.1/src# pgrep sleep

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