netdev - [PATCH RFC 03/48] Audit: implement audit self-defined compare function

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Date:	Tue, 7 May 2013 10:20:24 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	viro@...iv.linux.org.uk, eparis@...hat.com, ebiederm@...ssion.com,
	sgrubb@...hat.com, akpm@...ux-foundation.org,
	serge.hallyn@...ntu.com, davem@...emloft.net
Cc:	netdev@...r.kernel.org, containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-audit@...hat.com,
	Gao feng <gaofeng@...fujitsu.com>
Subject: [PATCH RFC 03/48] Audit: implement audit self-defined compare function

After this patch, audit netlink sockets can
communicate with each other when they belong
to the same user namespace.

Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
---
 kernel/audit.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/audit.c b/kernel/audit.c
index 766dcbf..3ae8793 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -937,6 +937,11 @@ static void audit_receive(struct sk_buff  *skb)
 	mutex_unlock(&audit_cmd_mutex);
 }
 
+static bool audit_compare(struct net *net, struct sock *sk)
+{
+	return (sock_net(sk)->user_ns == net->user_ns);
+}
+
 static int __net_init audit_net_init(struct net *net)
 {
 	struct user_namespace *ns = net->user_ns;
@@ -949,6 +954,7 @@ static int __net_init audit_net_init(struct net *net)
 		 */
 		struct netlink_kernel_cfg cfg = {
 			.input	= audit_receive,
+			.compare = audit_compare,
 		};
 
 		sk = netlink_kernel_create(net, NETLINK_AUDIT, &cfg);
-- 
1.8.1.4

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