diff options
| author | Kevin Cernekee <cernekee@chromium.org> | 2017-12-06 21:12:27 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-12-11 17:58:18 +0100 |
| commit | 93c647643b48f0131f02e45da3bd367d80443291 (patch) | |
| tree | 652bb87e4f4be4132684bbf24c6f1437a53119b3 /net/netlink | |
| parent | net: sh_eth: do not advertise Gigabit capabilities when not available (diff) | |
| download | linux-93c647643b48f0131f02e45da3bd367d80443291.tar.xz linux-93c647643b48f0131f02e45da3bd367d80443291.zip | |
netlink: Add netns check on taps
Currently, a nlmon link inside a child namespace can observe systemwide
netlink activity. Filter the traffic so that nlmon can only sniff
netlink messages from its own netns.
Test case:
vpnns -- bash -c "ip link add nlmon0 type nlmon; \
ip link set nlmon0 up; \
tcpdump -i nlmon0 -q -w /tmp/nlmon.pcap -U" &
sudo ip xfrm state add src 10.1.1.1 dst 10.1.1.2 proto esp \
spi 0x1 mode transport \
auth sha1 0x6162633132330000000000000000000000000000 \
enc aes 0x00000000000000000000000000000000
grep --binary abc123 /tmp/nlmon.pcap
Signed-off-by: Kevin Cernekee <cernekee@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netlink')
| -rw-r--r-- | net/netlink/af_netlink.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index b9e0ee4e22f5..79cc1bf36e4a 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -253,6 +253,9 @@ static int __netlink_deliver_tap_skb(struct sk_buff *skb, struct sock *sk = skb->sk; int ret = -ENOMEM; + if (!net_eq(dev_net(dev), sock_net(sk))) + return 0; + dev_hold(dev); if (is_vmalloc_addr(skb->head)) |