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net: Verify permission to link_net in newlink 

When applicable verify that the caller has permisson to the underlying
network namespace for a newly created network device.

Similary checks exist for the network namespace a network device will
be created in.

Fixes: 317f4810e4 ("rtnl: allow to create device with IFLA_LINK_NETNSID set")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman 2015-02-26 16:20:07 -06:00 committed by David S. Miller
parent 505ce4154a
commit 06615bed60
1 changed files with 3 additions and 0 deletions
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3
net/core/rtnetlink.c
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@ -2134,6 +2134,9 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
err = -EINVAL;
goto out;
}
err = -EPERM;
if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
goto out;
}
dev = rtnl_create_link(link_net ? : dest_net, ifname,