[PATCH ? 1/2] setpgid: should not accept ptraced childs

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

sys_setpgid() allows to change ->pgrp of ptraced childs.

'man setpgid' does not tell anything about that, so I consider
this behaviour is a bug.

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

--- 2.6.15-rc5/kernel/sys.c~	2005-11-22 19:35:32.000000000 +0300
+++ 2.6.15-rc5/kernel/sys.c	2005-12-11 22:40:33.000000000 +0300
@@ -1106,7 +1106,7 @@ asmlinkage long sys_setpgid(pid_t pid, p
 	if (!thread_group_leader(p))
 		goto out;
 
-	if (p->parent == current || p->real_parent == current) {
+	if (p->real_parent == current) {
 		err = -EPERM;
 		if (p->signal->session != current->signal->session)
 			goto out;
-
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