linux-kernel - [PATCH 3.10 130/143] net: fix a kernel infoleak in x25 module

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Message-Id: <1465122046-9645-131-git-send-email-w@1wt.eu>
Date:	Sun,  5 Jun 2016 12:20:33 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Kangjie Lu <kangjielu@...il.com>, Kangjie Lu <kjlu@...ech.edu>,
	"David S . Miller" <davem@...emloft.net>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 130/143] net: fix a kernel infoleak in x25 module

From: Kangjie Lu <kangjielu@...il.com>

commit 79e48650320e6fba48369fccf13fd045315b19b8 upstream.

Stack object "dte_facilities" is allocated in x25_rx_call_request(),
which is supposed to be initialized in x25_negotiate_facilities.
However, 5 fields (8 bytes in total) are not initialized. This
object is then copied to userland via copy_to_user, thus infoleak
occurs.

Signed-off-by: Kangjie Lu <kjlu@...ech.edu>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Willy Tarreau <w@....eu>
---
 net/x25/x25_facilities.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/x25/x25_facilities.c b/net/x25/x25_facilities.c
index 66c63873..de7552d 100644
--- a/net/x25/x25_facilities.c
+++ b/net/x25/x25_facilities.c
@@ -271,6 +271,7 @@ int x25_negotiate_facilities(struct sk_buff *skb, struct sock *sk,
 
 	memset(&theirs, 0, sizeof(theirs));
 	memcpy(new, ours, sizeof(*new));
+	memset(dte, 0, sizeof(*dte));
 
 	len = x25_parse_facilities(skb, &theirs, dte, &x25->vc_facil_mask);
 	if (len < 0)
-- 
2.8.0.rc2.1.gbe9624a