tree 41d1be6513fc3a5367414654eeaf11bbb12d4814
parent fb86a35b9ded8a7e53a432cbf28df603cdd4849c
author Oren Laadan <orenl@cs.columbia.edu> 1136711031 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1136780040 -0800

[PATCH] fork: fix race in setting child's pgrp and tty

In fork, child should recopy parent's pgrp/tty after it has tasklist_lock.
Otherwise following a setpgid() on the parent, *after* copy_signal(), the
child will own a stale pgrp (which may be reused); (eg.  if copy_mm()
sleeps a long while due to memory pressure).  Similar issue for the tty.

Signed-off-by: Oren Laadan <orenl@cs.columbia.edu>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>