[PATCH] Allow signalling container-init

[sukadev at us.ibm.com]

Pavel,

Should we include this in the patchset ?

Sukadev
---

From: Sukadev Bhattiprolu <sukadev at us.ibm.com>
Subject: [PATCH] Allow signalling container-init

Only the global-init process must be special - any other container-init
process must be killable to prevent run-away processes in the system.

TODO: 	Ideally we should allow killing the container-init only from
	ancestor containers and prevent it being killed from that or
	descendant containers.  But that is a more complex change and
	will be addressed by a follow-on patch. For now allow the
	container-init to be terminated by any process with sufficient
	privileges.

Signed-off-by: Sukadev Bhattiprolu <sukadev at us.ibm.com>
---
 kernel/signal.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

Index: lx26-23-rc1-mm1/kernel/signal.c
===================================================================
--- lx26-23-rc1-mm1.orig/kernel/signal.c	2007-08-07 13:52:12.000000000 -0700
+++ lx26-23-rc1-mm1/kernel/signal.c	2007-08-08 15:09:27.000000000 -0700
@@ -1861,11 +1861,9 @@ relock:
 			continue;
 
 		/*
-		 * Init of a pid space gets no signals it doesn't want from
-		 * within that pid space. It can of course get signals from
-		 * its parent pid space.
+		 * Global init gets no signals it doesn't want.
 		 */
-		if (current == task_child_reaper(current))
+		if (is_global_init(current->group_leader))
 			continue;
 
 		if (sig_kernel_stop(signr)) {