diff -u linux-2.6.24.4/kernel/sys.c linux-2.6.24.4/kernel/sys.c
--- linux-2.6.24.4/kernel/sys.c	2008-03-26 20:21:09.000000000 -0400
+++ linux-2.6.24.4/kernel/sys.c	2008-04-17 19:50:42.000000000 -0400
@@ -986,7 +986,10 @@
 	if (pgid != pid) {
 		struct task_struct *g;
 
-		g = find_task_by_pid_type_ns(PIDTYPE_PGID, pgid, ns);
+		/* grsec: replaced find_task_by_pid_type_ns with equivalent
+		   call which lacks the chroot restriction
+		*/
+		g = pid_task(find_pid_ns(pgid, ns), PIDTYPE_PGID);
 		if (!g || task_session(g) != task_session(group_leader))
 			goto out;
 	}