netdev - [PATCH 13/16] rose: fix info leak via msg_name in rose

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Date:	Sun,  7 Apr 2013 13:51:59 +0200
From:	Mathias Krause <minipli@...glemail.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org,
	Allan Stephens <allan.stephens@...driver.com>,
	Aloisio Almeida Jr <aloisio.almeida@...nbossa.org>,
	Andy King <acking@...are.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Dmitry Torokhov <dtor@...are.com>,
	George Zhang <georgezhang@...are.com>,
	Gustavo Padovan <gustavo@...ovan.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	Jon Maloy <jon.maloy@...csson.com>,
	Lauro Ramos Venancio <lauro.venancio@...nbossa.org>,
	Marcel Holtmann <marcel@...tmann.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Samuel Ortiz <samuel@...tiz.org>,
	Sjur Braendeland <sjur.brandeland@...ricsson.com>,
	Ursula Braun <ursula.braun@...ibm.com>,
	Brad Spengler <spender@...ecurity.net>,
	Mathias Krause <minipli@...glemail.com>
Subject: [PATCH 13/16] rose: fix info leak via msg_name in rose_recvmsg()

The code in rose_recvmsg() does not initialize all of the members of
struct sockaddr_rose/full_sockaddr_rose when filling the sockaddr info.
Nor does it initialize the padding bytes of the structure inserted by
the compiler for alignment. This will lead to leaking uninitialized
kernel stack bytes in net/socket.c.

Fix the issue by initializing the memory used for sockaddr info with
memset(0).

Cc: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Mathias Krause <minipli@...glemail.com>
---
 net/rose/af_rose.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c
index cf68e6e..9c83474 100644
--- a/net/rose/af_rose.c
+++ b/net/rose/af_rose.c
@@ -1253,6 +1253,7 @@ static int rose_recvmsg(struct kiocb *iocb, struct socket *sock,
 	skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 
 	if (srose != NULL) {
+		memset(srose, 0, msg->msg_namelen);
 		srose->srose_family = AF_ROSE;
 		srose->srose_addr   = rose->dest_addr;
 		srose->srose_call   = rose->dest_call;
-- 
1.7.10.4

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