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>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 3213c72..e490b84 100644 (file)
--- 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;
 };

diff --git a/net/core/net-procfs.c b/net/core/net-procfs.c
index d8b9dba..5b80163 100644 (file)
--- a/net/core/net-procfs.c
+++ b/net/core/net-procfs.c
@@ -260,7 +260,8 @@ static int ptype_seq_show(struct seq_file *seq, void *v)
 
        if (v == SEQ_START_TOKEN)
                seq_puts(seq, "Type Device      Function\n");
-       else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
+       else if ((!pt->af_packet_net || net_eq(pt->af_packet_net, seq_file_net(seq))) &&
+                (!pt->dev || net_eq(dev_net(pt->dev), seq_file_net(seq)))) {
                if (pt->type == htons(ETH_P_ALL))
                        seq_puts(seq, "ALL ");
                else

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 5bd409a..85ea7dd 100644 (file)
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1774,6 +1774,7 @@ static int fanout_add(struct sock *sk, struct fanout_args *args)
                match->prot_hook.dev = po->prot_hook.dev;
                match->prot_hook.func = packet_rcv_fanout;
                match->prot_hook.af_packet_priv = match;
+               match->prot_hook.af_packet_net = read_pnet(&match->net);
                match->prot_hook.id_match = match_fanout_group;
                match->max_num_members = args->max_num_members;
                list_add(&match->list, &fanout_list);
@@ -3353,6 +3354,7 @@ static int packet_create(struct net *net, struct socket *sock, int protocol,
                po->prot_hook.func = packet_rcv_spkt;
 
        po->prot_hook.af_packet_priv = sk;
+       po->prot_hook.af_packet_net = sock_net(sk);
 
        if (proto) {
                po->prot_hook.type = proto;