netdev - [PATCH 1/3] net: ax25: fix information leak to userland

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Message-Id: <1288545022-16393-1-git-send-email-segooon@gmail.com>
Date:	Sun, 31 Oct 2010 20:10:22 +0300
From:	Vasiliy Kulikov <segooon@...il.com>
To:	kernel-janitors@...r.kernel.org
Cc:	Joerg Reuter <jreuter@...na.de>,
	Ralf Baechle <ralf@...ux-mips.org>,
	"David S. Miller" <davem@...emloft.net>,
	linux-hams@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] net: ax25: fix information leak to userland

Sometimes ax25_getname() doesn't initialize all members of fsa_digipeater
field of fsa struct.  This structure is then copied to userland.  It leads to
leaking of contents of kernel stack memory.  We have to initialize them to zero.

Signed-off-by: Vasiliy Kulikov <segooon@...il.com>
---
 net/ax25/af_ax25.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index 26eaebf..a324d83 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -1392,6 +1392,7 @@ static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
 	ax25_cb *ax25;
 	int err = 0;
 
+	memset(&fsa->fsa_digipeater, 0, sizeof(fsa->fsa_digipeater));
 	lock_sock(sk);
 	ax25 = ax25_sk(sk);
 
-- 
1.7.0.4

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