[PATCH] setpgid(child) fails if the child was forked by sub-thread

[Oleg Nesterov <oleg@tv-sign.ru>]

Spotted by Marcin Kowalczyk <qrczak@knm.org.pl>.

sys_setpgid(child) fails if the child was forked by sub-thread.

Fix the "is it our child" check. The previous commit
ee0acf90d320c29916ba8c5c1b2e908d81f5057d was not complete.

(this patch asks for the new same_thread_group() helper, but mainline doesn't
 have it yet).

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>

--- t/kernel/sys.c~SETPGID	2007-08-09 19:59:27.000000000 +0400
+++ t/kernel/sys.c	2007-08-22 20:11:23.000000000 +0400
@@ -1442,7 +1442,6 @@ asmlinkage long sys_times(struct tms __u
  * Auch. Had to add the 'did_exec' flag to conform completely to POSIX.
  * LBT 04.03.94
  */
-
 asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
 {
 	struct task_struct *p;
@@ -1470,7 +1469,7 @@ asmlinkage long sys_setpgid(pid_t pid, p
 	if (!thread_group_leader(p))
 		goto out;
 
-	if (p->real_parent == group_leader) {
+	if (p->real_parent->tgid == group_leader->tgid) {
 		err = -EPERM;
 		if (task_session(p) != task_session(group_leader))
 			goto out;