Patch "net/unix: don't show information about sockets from other namespaces" has been added to the 4.13-stable tree

This is a note to let you know that I've just added the patch titled

net/unix: don't show information about sockets from other namespaces

to the 4.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
net-unix-don-t-show-information-about-sockets-from-other-namespaces.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Andrei Vagin <[email protected]>
Date: Wed, 25 Oct 2017 10:16:42 -0700
Subject: net/unix: don't show information about sockets from other namespaces

From: Andrei Vagin <[email protected]>

[ Upstream commit 0f5da659d8f1810f44de14acf2c80cd6499623a0 ]

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

---
 net/unix/diag.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -257,6 +257,8 @@ 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)

Patches currently in stable-queue which might be from [email protected] are

queue-4.13/net-unix-don-t-show-information-about-sockets-from-other-namespaces.patch