linux-kernel - [PATCH] fix a kernel infoleak in x25 module

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Message-Id: <1462723814-14732-1-git-send-email-kjlu@gatech.edu>
Date:	Sun,  8 May 2016 12:10:14 -0400
From:	Kangjie Lu <kangjielu@...il.com>
To:	andrew.hendry@...il.com
Cc:	davem@...emloft.net, linux-x25@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	taesoo@...ech.edu, insu@...ech.edu, csong84@...ech.edu,
	Kangjie Lu <kjlu@...ech.edu>
Subject: [PATCH] fix a kernel infoleak in x25 module

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>
---
 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 2844031..a1c30c6 100644
--- a/net/x25/x25_facilities.c
+++ b/net/x25/x25_facilities.c
@@ -278,6 +278,7 @@ 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)
-- 
1.9.1