linux-kernel - [PATCH] [60/139] net: ax25: fix information leak to userland

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Date:	Tue,  1 Feb 2011 16:44:16 -0800 (PST)
From:	Andi Kleen <andi@...stfloor.org>
To:	segooon@...il.com, davem@...emloft.net, gregkh@...e.de,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org, stable@...nel.org
Subject: [PATCH] [60/139] net: ax25: fix information leak to userland

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

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

From: Vasiliy Kulikov <segooon@...il.com>

[ Upstream commit fe10ae53384e48c51996941b7720ee16995cbcb7 ]

Sometimes ax25_getname() doesn't initialize all members of fsa_digipeater
field of fsa struct, also the struct has padding bytes between
sax25_call and sax25_ndigis fields.  This structure is then copied to
userland.  It leads to leaking of contents of kernel stack memory.

Signed-off-by: Vasiliy Kulikov <segooon@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 net/ax25/af_ax25.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.35.y/net/ax25/af_ax25.c
===================================================================
--- linux-2.6.35.y.orig/net/ax25/af_ax25.c
+++ linux-2.6.35.y/net/ax25/af_ax25.c
@@ -1392,6 +1392,7 @@ static int ax25_getname(struct socket *s
 	ax25_cb *ax25;
 	int err = 0;
 
+	memset(fsa, 0, sizeof(fsa));
 	lock_sock(sk);
 	ax25 = ax25_sk(sk);
 
@@ -1403,7 +1404,6 @@ static int ax25_getname(struct socket *s
 
 		fsa->fsa_ax25.sax25_family = AF_AX25;
 		fsa->fsa_ax25.sax25_call   = ax25->dest_addr;
-		fsa->fsa_ax25.sax25_ndigis = 0;
 
 		if (ax25->digipeat != NULL) {
 			ndigi = ax25->digipeat->ndigi;
--
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