linux-kernel - [PATCH] [50/106] CAN: Use inode instead of kernel address for /proc file

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Date:	Tue, 26 Apr 2011 14:13:30 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	drosenberg@...curity.com, socketcan@...tkopp.net,
	davem@...emloft.net, ak@...ux.intel.com, jmm@...ian.org,
	gregkh@...e.de, linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com
Subject: [PATCH] [50/106] CAN: Use inode instead of kernel address for /proc file

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

------------------
From: Dan Rosenberg <drosenberg@...curity.com>

commit 9f260e0efa4766e56d0ac14f1aeea6ee5eb8fe83 upstream.

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>
Acked-by: Oliver Hartkopp <socketcan@...tkopp.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Cc: Moritz Muehlenhoff <jmm@...ian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/can/bcm.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: linux-2.6.35.y/net/can/bcm.c
===================================================================
--- linux-2.6.35.y.orig/net/can/bcm.c
+++ linux-2.6.35.y/net/can/bcm.c
@@ -125,7 +125,7 @@ struct bcm_sock {
 	struct list_head tx_ops;
 	unsigned long dropped_usr_msgs;
 	struct proc_dir_entry *bcm_proc_read;
-	char procname [20]; /* pointer printed in ASCII with \0 */
+	char procname [32]; /* inode number in decimal with \0 */
 };
 
 static inline struct bcm_sock *bcm_sk(const struct sock *sk)
@@ -1521,7 +1521,7 @@ static int bcm_connect(struct socket *so
 
 	if (proc_dir) {
 		/* unique socket address as filename */
-		sprintf(bo->procname, "%p", sock);
+		sprintf(bo->procname, "%lu", sock_i_ino(sk));
 		bo->bcm_proc_read = proc_create_data(bo->procname, 0644,
 						     proc_dir,
 						     &bcm_proc_fops, sk);
--
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