From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mathias Krause Subject: [PATCH 09/14] l2tp: fix info leak via getsockname() Date: Wed, 15 Aug 2012 23:31:52 +0200 Message-ID: <1345066317-22512-10-git-send-email-minipli@googlemail.com> References: <1345066317-22512-1-git-send-email-minipli@googlemail.com> Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Mathias Krause , James Chapman To: "David S. Miller" Return-path: In-Reply-To: <1345066317-22512-1-git-send-email-minipli@googlemail.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org 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 Cc: James Chapman --- net/l2tp/l2tp_ip6.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c index 35e1e4b..9275471 100644 --- a/net/l2tp/l2tp_ip6.c +++ b/net/l2tp/l2tp_ip6.c @@ -410,6 +410,7 @@ static int l2tp_ip6_getname(struct socket *sock, struct sockaddr *uaddr, 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; -- 1.7.10.4