diff options
| author | Congyu Liu <liu3101@purdue.edu> | 2022-01-18 14:20:13 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-02-01 17:24:37 +0100 |
| commit | e372ecd455b6ebc7720f52bf4b5f5d44d02f2092 (patch) | |
| tree | a83f0ce8c1adf0a8635bfd6deded58485bb6e82b /net/core | |
| parent | 20b7af413153f61c92c48938173ba587be4f6524 (diff) | |
net: fix information leakage in /proc/net/ptype
commit 47934e06b65637c88a762d9c98329ae6e3238888 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/net-procfs.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/core/net-procfs.c b/net/core/net-procfs.c index 36347933ec3a..f1e005c8a54f 100644 --- a/net/core/net-procfs.c +++ b/net/core/net-procfs.c @@ -252,7 +252,8 @@ 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 |