linux-kernel - [PATCH 7/7][v6] SI_USER: Masquerade si

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Message-ID: <20090107075242.GG27985@us.ibm.com>
Date:	Tue, 6 Jan 2009 23:52:42 -0800
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	oleg@...hat.com, ebiederm@...ssion.com, roland@...hat.com,
	bastian@...di.eu.org
Cc:	containers@...ts.osdl.org, linux-kernel@...r.kernel.org,
	xemul@...nvz.org
Subject:  [PATCH 7/7][v6] SI_USER: Masquerade si_pid when crossing pid ns
	boundary


From: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Date: Wed, 24 Dec 2008 14:14:18 -0800
Subject: [PATCH 7/7][v6] SI_USER: Masquerade si_pid when crossing pid ns boundary

When sending a signal to a descendant namespace, set ->si_pid to 0 since
the sender does not have a pid in the receiver's namespace.

Note:
	- If rt_sigqueueinfo() sets si_code to SI_USER when sending a
	  signal across a pid namespace boundary, the value in ->si_pid
	  will be cleared to 0.

Changelog[v5]:
	- (Oleg Nesterov) Address both sys_kill() and sys_tkill() cases
	  in send_signal() to simplify code (this drops patch 7/7 from
	  earlier version of patchset).

Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
---
 kernel/signal.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index 6ad47c0..d96ac1a 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -917,6 +917,8 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
 			break;
 		default:
 			copy_siginfo(&q->info, info);
+			if (from_ancestor_ns)
+				q->info.si_pid = 0;
 			break;
 		}
 	} else if (!is_si_special(info)) {
-- 
1.5.2.5

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