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

[Radu Duta]

Public bug reported:


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

** Affects: shadow (Ubuntu)
     Importance: Undecided
         Status: New

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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:

  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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