linux-kernel - [ 016/218] Bluetooth: RFCOMM - Fix info leak via getsockname()

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Message-Id: <20120928201503.148882259@linuxfoundation.org>
Date:	Fri, 28 Sep 2012 13:13:53 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Mathias Krause <minipli@...glemail.com>,
	Marcel Holtmann <marcel@...tmann.org>,
	Gustavo Padovan <gustavo@...ovan.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 016/218] Bluetooth: RFCOMM - Fix info leak via getsockname()

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

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


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

[ Upstream commit 9344a972961d1a6d2c04d9008b13617bcb6ec2ef ]

The RFCOMM code fails to initialize the trailing padding byte of struct
sockaddr_rc added for alignment. It that for leaks one byte kernel stack
via the getsockname() syscall. Add an explicit memset(0) before filling
the structure to avoid the info leak.

Signed-off-by: Mathias Krause <minipli@...glemail.com>
Cc: Marcel Holtmann <marcel@...tmann.org>
Cc: Gustavo Padovan <gustavo@...ovan.org>
Cc: Johan Hedberg <johan.hedberg@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/bluetooth/rfcomm/sock.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -546,6 +546,7 @@ static int rfcomm_sock_getname(struct so
 
 	BT_DBG("sock %p, sk %p", sock, sk);
 
+	memset(sa, 0, sizeof(*sa));
 	sa->rc_family  = AF_BLUETOOTH;
 	sa->rc_channel = rfcomm_pi(sk)->channel;
 	if (peer)


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