| From | Greg Kroah-Hartman <> | Subject | [ 13/42] l2tp: fix info leak in l2tp_ip6_recvmsg() | Date | Mon, 29 Apr 2013 12:01:55 -0700 |
| |
3.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mathias Krause <minipli@googlemail.com>
[ Upstream commit b860d3cc62877fad02863e2a08efff69a19382d2 ]
The L2TP code for IPv6 fails to initialize the l2tp_conn_id member of struct sockaddr_l2tpip6 and therefore leaks four bytes kernel stack in l2tp_ip6_recvmsg() in case msg_name is set.
Initialize l2tp_conn_id with 0 to avoid the info leak.
Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/l2tp/l2tp_ip6.c | 1 + 1 file changed, 1 insertion(+)
--- a/net/l2tp/l2tp_ip6.c +++ b/net/l2tp/l2tp_ip6.c @@ -684,6 +684,7 @@ static int l2tp_ip6_recvmsg(struct kiocb lsa->l2tp_addr = ipv6_hdr(skb)->saddr; lsa->l2tp_flowinfo = 0; lsa->l2tp_scope_id = 0; + lsa->l2tp_conn_id = 0; if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL) lsa->l2tp_scope_id = IP6CB(skb)->iif; }
|