[RFC][PATCH] 'kill sig -1' must only apply to callers namespace

[sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org]

From d92b4befe07c6a1e852e4462126a5443342448cd Mon Sep 17 00:00:00 2001
From: Sukadev Bhattiprolu <sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
Date: Tue, 21 Oct 2008 18:00:01 -0700
Subject: [PATCH] kill sig -1 must only apply to callers namespace

Currently "kill <sig> -1" kills processes in all namespaces and breaks the
isolation of namespaces. Earlier attempt to fix this is discussed at:

	http://lkml.org/lkml/2008/7/23/148

but nothing seems to have happened since then.

This patch uses the simple fix suggested by Oleg Nesterov.

Signed-off-by: Sukadev Bhattiprolu <sukadev-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
---
 kernel/signal.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index 105217d..4530fc6 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1144,7 +1144,8 @@ static int kill_something_info(int sig, struct siginfo *info, pid_t pid)
 		struct task_struct * p;
 
 		for_each_process(p) {
-			if (p->pid > 1 && !same_thread_group(p, current)) {
+			if (task_pid_vnr(p) > 1 &&
+					!same_thread_group(p, current)) {
 				int err = group_send_sig_info(sig, info, p);
 				++count;
 				if (err != -EPERM)
-- 
1.5.2.5