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

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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: 51d7cccf07 ("net: make sock diag per-namespace")
Signed-off-by: Andrei Vagin <avagin@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrei Vagin 2017-10-25 10:16:42 -07:00 committed by David S. Miller
parent 3eb8feeb17
commit 0f5da659d8
1 changed files with 2 additions and 0 deletions
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2
net/unix/diag.c
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@ -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)