netdev - [PATCH] CAN: Use inode instead of kernel address for /proc file

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Message-ID: <1293315371.9764.44.camel@Dan>
Date:	Sat, 25 Dec 2010 17:16:11 -0500
From:	Dan Rosenberg <drosenberg@...curity.com>
To:	Oliver Hartkopp <socketcan@...tkopp.net>,
	Urs Thuermann <urs.thuermann@...kswagen.de>,
	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, security@...nel.org
Subject: [PATCH] CAN: Use inode instead of kernel address for /proc file

Since the socket address is just being used as a unique identifier, its
inode number is an alternative that does not leak potentially sensitive
information.

CC-ing stable because MITRE has assigned CVE-2010-4565 to the issue.

Signed-off-by: Dan Rosenberg <drosenberg@...curity.com>
Cc: stable <stable@...nel.org>
---
 net/can/bcm.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/can/bcm.c b/net/can/bcm.c
index 6faa825..5748901 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -1520,8 +1520,8 @@ static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len,
 	bo->bound = 1;
 
 	if (proc_dir) {
-		/* unique socket address as filename */
-		sprintf(bo->procname, "%p", sock);
+		/* socket inode as filename */
+		sprintf(bo->procname, "%lx", sock_i_ino(sk));
 		bo->bcm_proc_read = proc_create_data(bo->procname, 0644,
 						     proc_dir,
 						     &bcm_proc_fops, sk);


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