]> err.no Git - linux-2.6/commit
exec: rework the group exit and fix the race with kill
authorOleg Nesterov <oleg@tv-sign.ru>
Tue, 5 Feb 2008 06:27:24 +0000 (22:27 -0800)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Tue, 5 Feb 2008 17:44:07 +0000 (09:44 -0800)
commited5d2cac114202fe2978a9cbcab8f5032796d538
treeaa9aaea1aa0945bd9159685d1b04897d105a90c9
parentf558b7e408026eb3c6afcd0e8fc1f7fe31195a6a
exec: rework the group exit and fix the race with kill

As Roland pointed out, we have the very old problem with exec.  de_thread()
sets SIGNAL_GROUP_EXIT, kills other threads, changes ->group_leader and then
clears signal->flags.  All signals (even fatal ones) sent in this window
(which is not too small) will be lost.

With this patch exec doesn't abuse SIGNAL_GROUP_EXIT.  signal_group_exit(),
the new helper, should be used to detect exit_group() or exec() in progress.
It can have more users, but this patch does only strictly necessary changes.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Davide Libenzi <davidel@xmailserver.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Robin Holt <holt@sgi.com>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/exec.c
include/linux/sched.h
kernel/exit.c
kernel/signal.c