diff options
| author | Congyu Liu <liu3101@purdue.edu> | 2022-01-18 22:20:13 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-01-20 13:12:53 +0300 |
| commit | 47934e06b65637c88a762d9c98329ae6e3238888 (patch) | |
| tree | aec48cf65cd8abc38011c80707316a5d94e0ea16 /include | |
| parent | fa2e1ba3e9e39072fa7a6a9d11ac432c505b4ac7 (diff) | |
| download | linux-47934e06b65637c88a762d9c98329ae6e3238888.tar.xz | |
net: fix information leakage in /proc/net/ptype
In one net namespace, after creating a packet socket without binding
it to a device, users in other net namespaces can observe the new
`packet_type` added by this packet socket by reading `/proc/net/ptype`
file. This is minor information leakage as packet socket is
namespace aware.
Add a net pointer in `packet_type` to keep the net namespace of
of corresponding packet socket. In `ptype_seq_show`, this net pointer
must be checked when it is not NULL.
Fixes: 2feb27dbe00c ("[NETNS]: Minor information leak via /proc/net/ptype file.")
Signed-off-by: Congyu Liu <liu3101@purdue.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/netdevice.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 3213c7227b59..e490b84732d1 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -2548,6 +2548,7 @@ struct packet_type { struct net_device *); bool (*id_match)(struct packet_type *ptype, struct sock *sk); + struct net *af_packet_net; void *af_packet_priv; struct list_head list; }; |