netdev - [PATCH RESEND 2/2] neigh: disallow un-init

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Message-Id: <1371012275-31735-2-git-send-email-gaofeng@cn.fujitsu.com>
Date:	Wed, 12 Jun 2013 12:44:35 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	davem@...emloft.net
Cc:	ebiederm@...ssion.com, netdev@...r.kernel.org,
	Gao feng <gaofeng@...fujitsu.com>
Subject: [PATCH RESEND 2/2] neigh: disallow un-init_net to change thresh of neigh

thresh and interval are global resources,
only init net can change them.

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

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index e4027ff..8feb382 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -2056,6 +2056,12 @@ static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh)
 		}
 	}
 
+	err = -EPERM;
+	if ((tb[NDTA_THRESH1] || tb[NDTA_THRESH2] ||
+	     tb[NDTA_THRESH3] || tb[NDTA_GC_INTERVAL]) &&
+	    !net_eq(net, &init_net))
+		goto errout_tbl_lock;
+
 	if (tb[NDTA_THRESH1])
 		tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]);
 
-- 
1.8.1.4

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