linux-kernel - [PATCH 143/173] econet: 4 byte infoleak to the network

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Date:	Mon, 25 Apr 2011 22:04:55 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org
Cc:	Vasiliy Kulikov <segoon@...nwall.com>,
	Phil Blundell <philb@....org>,
	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 143/173] econet: 4 byte infoleak to the network

2.6.27.59-stable review patch.  If anyone has any objections, please let us know.

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

From: Vasiliy Kulikov <segoon@...nwall.com>

commit 67c5c6cb8129c595f21e88254a3fc6b3b841ae8e upstream.

struct aunhdr has 4 padding bytes between 'pad' and 'handle' fields on
x86_64.  These bytes are not initialized in the variable 'ah' before
sending 'ah' to the network.  This leads to 4 bytes kernel stack
infoleak.

This bug was introduced before the git epoch.

Signed-off-by: Vasiliy Kulikov <segoon@...nwall.com>
Acked-by: Phil Blundell <philb@....org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/econet/af_econet.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/econet/af_econet.c
+++ b/net/econet/af_econet.c
@@ -428,10 +428,10 @@ static int econet_sendmsg(struct kiocb *
 		udpdest.sin_addr.s_addr = htonl(network | addr.station);
 	}

+	memset(&ah, 0, sizeof(ah));
 	ah.port = port;
 	ah.cb = cb & 0x7f;
 	ah.code = 2;		/* magic */
-	ah.pad = 0;

 	/* tack our header on the front of the iovec */
 	size = sizeof(struct aunhdr);

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