From a3a7f9f79d84dcc901b41b4666abd8e8ed090ed5 Mon Sep 17 00:00:00 2001 From: Andrei Vagin Date: Wed, 25 Oct 2017 10:16:42 -0700 Subject: [PATCH] net/unix: don't show information about sockets from other namespaces commit 0f5da659d8f1810f44de14acf2c80cd6499623a0 upstream. socket_diag shows information only about sockets from a namespace where a diag socket lives. But if we request information about one unix socket, the kernel don't check that its netns is matched with a diag socket namespace, so any user can get information about any unix socket in a system. This looks like a bug. v2: add a Fixes tag Fixes: 51d7cccf0723 ("net: make sock diag per-namespace") Signed-off-by: Andrei Vagin Signed-off-by: David S. Miller Signed-off-by: Ben Hutchings --- net/unix/diag.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/unix/diag.c b/net/unix/diag.c index 86fa0f3b2caf..08f8125fedf1 100644 --- a/net/unix/diag.c +++ b/net/unix/diag.c @@ -256,6 +256,8 @@ static int unix_diag_get_exact(struct sk_buff *in_skb, err = -ENOENT; if (sk == NULL) goto out_nosk; + if (!net_eq(sock_net(sk), net)) + goto out; err = sock_diag_check_cookie(sk, req->udiag_cookie); if (err)