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| author | Kevin Cernekee <cernekee@chromium.org> | 2017-12-06 12:12:27 -0800 |
|---|---|---|
| committer | Oleg Matcovschi <omatcovschi@google.com> | 2018-03-13 19:47:41 -0700 |
| commit | 04de0650469ab58d5159b29f850fc3c06e6f4975 (patch) | |
| tree | 6204395fba0ad1846483148df65ba3c22b19a33d /net/unix/sysctl_net_unix.c | |
| parent | ef7168435d5783fa9167b9f39b520f3304781746 (diff) | |
netlink: Add netns check on taps
[ Upstream commit 93c647643b48f0131f02e45da3bd367d80443291 ]
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
Bug: 70980949
Signed-off-by: Kevin Cernekee <cernekee@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/unix/sysctl_net_unix.c')
0 files changed, 0 insertions, 0 deletions