| From | Paul Gortmaker <> | Subject | [v2.6.34-stable 026/213] iucv: Fix missing msg_namelen update in iucv_sock_recvmsg() | Date | Wed, 5 Feb 2014 14:59:41 -0500 |
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From: Mathias Krause <minipli@googlemail.com>
------------------- This is a commit scheduled for the next v2.6.34 longterm release. http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git If you see a problem with using this for longterm, please comment. -------------------
commit a5598bd9c087dc0efc250a5221e5d0e6f584ee88 upstream.
The current code does not fill the msg_name member in case it is set. It also does not set the msg_namelen member to 0 and therefore makes net/socket.c leak the local, uninitialized sockaddr_storage variable to userland -- 128 bytes of kernel stack memory.
Fix that by simply setting msg_namelen to 0 as obviously nobody cared about iucv_sock_recvmsg() not filling the msg_name in case it was set.
Cc: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> --- net/iucv/af_iucv.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c index c18286a2167b..1e3b2ec74622 100644 --- a/net/iucv/af_iucv.c +++ b/net/iucv/af_iucv.c @@ -1160,6 +1160,8 @@ static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct sk_buff *skb, *rskb, *cskb; int err = 0; + msg->msg_namelen = 0; + if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) && skb_queue_empty(&iucv->backlog_skb_q) && skb_queue_empty(&sk->sk_receive_queue) && -- 1.8.5.2
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