linux-kernel - [PATCH 3.16 143/204] net/unix: don't show information about sockets from other namespaces

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Date:   Thu, 28 Dec 2017 17:05:44 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "David S. Miller" <davem@...emloft.net>,
        "Andrei Vagin" <avagin@...nvz.org>
Subject: [PATCH 3.16 143/204] net/unix: don't show information about
 sockets from other namespaces

3.16.52-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Andrei Vagin <avagin@...nvz.org>

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 <avagin@...nvz.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/unix/diag.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/net/unix/diag.c
+++ b/net/unix/diag.c
@@ -256,6 +256,8 @@ static int unix_diag_get_exact(struct sk
 	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)