netdev - [PATCH] net/unix: don't show information about sockets from other namespaces

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Message-Id: <20171025071744.29095-1-avagin@openvz.org>
Date:   Wed, 25 Oct 2017 00:17:44 -0700
From:   Andrei Vagin <avagin@...nvz.org>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Andrei Vagin <avagin@...nvz.org>
Subject: [PATCH] net/unix: don't show information about sockets from other namespaces

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.

Signed-off-by: Andrei Vagin <avagin@...nvz.org>
---
 net/unix/diag.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/unix/diag.c b/net/unix/diag.c
index 4d96797..384c84e 100644
--- a/net/unix/diag.c
+++ b/net/unix/diag.c
@@ -257,6 +257,8 @@ 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)
-- 
2.9.4