4.9-stable review patch. If anyone has any objections, please let me know.
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From: Andrei Vagin avagin@openvz.org
[ 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
Fixes: 51d7cccf0723 ("net: make sock diag per-namespace") Signed-off-by: Andrei Vagin avagin@openvz.org Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/unix/diag.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/net/unix/diag.c +++ b/net/unix/diag.c @@ -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)