linux-kernel - [ 019/262] l2tp: fix info leak via getsockname()

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Message-Id: <20120928183000.225333743@linuxfoundation.org>
Date:	Fri, 28 Sep 2012 11:49:08 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>, alan@...rguk.ukuu.org.uk,
	Mathias Krause <minipli@...glemail.com>,
	James Chapman <jchapman@...alix.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 019/262] l2tp: fix info leak via getsockname()

From: Greg KH <gregkh@...uxfoundation.org>

3.5-stable review patch.  If anyone has any objections, please let me know.

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


From: Mathias Krause <minipli@...glemail.com>

[ Upstream commit 04d4fbca1017c11381e7d82acea21dd741e748bc ]

The L2TP code for IPv6 fails to initialize the l2tp_unused member of
struct sockaddr_l2tpip6 and that for leaks two bytes kernel stack via
the getsockname() syscall. Initialize l2tp_unused with 0 to avoid the
info leak.

Signed-off-by: Mathias Krause <minipli@...glemail.com>
Cc: James Chapman <jchapman@...alix.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/l2tp/l2tp_ip6.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/l2tp/l2tp_ip6.c
+++ b/net/l2tp/l2tp_ip6.c
@@ -410,6 +410,7 @@ static int l2tp_ip6_getname(struct socke
 	lsa->l2tp_family = AF_INET6;
 	lsa->l2tp_flowinfo = 0;
 	lsa->l2tp_scope_id = 0;
+	lsa->l2tp_unused = 0;
 	if (peer) {
 		if (!lsk->peer_conn_id)
 			return -ENOTCONN;


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