linux-kernel - [RFC PATCH 08/14] af_netlink.c: make netlink

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Message-Id: <1310513452-13397-9-git-send-email-serge@hallyn.com>
Date:	Tue, 12 Jul 2011 23:30:46 +0000
From:	Serge Hallyn <serge@...lyn.com>
To:	linux-kernel@...r.kernel.org, containers@...ts.linux-foundation.org
Cc:	dhowells@...hat.com, ebiederm@...ssion.com,
	"Serge E. Hallyn" <serge.hallyn@...onical.com>
Subject: [RFC PATCH 08/14] af_netlink.c: make netlink_capable userns-aware

From: Serge E. Hallyn <serge.hallyn@...onical.com>

netlink_capable should check for permissions against the user
namespace owning the socket in question.

Signed-off-by: Serge E. Hallyn <serge.hallyn@...onical.com>
Cc: Eric W. Biederman <ebiederm@...ssion.com>
---
 net/netlink/af_netlink.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 6ef64ad..81c1099 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -580,8 +580,15 @@ retry:
 
 static inline int netlink_capable(struct socket *sock, unsigned int flag)
 {
-	return (nl_table[sock->sk->sk_protocol].nl_nonroot & flag) ||
-	       capable(CAP_NET_ADMIN);
+	struct net *net;
+	if (nl_table[sock->sk->sk_protocol].nl_nonroot & flag)
+		return 1;
+#ifdef CONFIG_NET_NS
+	net = sock->sk->sk_net;
+#else
+	net = &init_net;
+#endif
+	return ns_capable(net->user_ns, CAP_NET_ADMIN);
 }
 
 static void
-- 
1.7.4.1

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