linux-kernel - [PATCH 158/173] CAN: Use inode instead of kernel address for /proc file

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Message-Id: <20110425200239.858405164@pcw.home.local>
Date:	Mon, 25 Apr 2011 22:05:10 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org
Cc:	Dan Rosenberg <drosenberg@...curity.com>,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	"David S. Miller" <davem@...emloft.net>,
	Moritz Muehlenhoff <jmm@...ian.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 158/173] CAN: Use inode instead of kernel address for /proc file

2.6.27.59-stable review patch.  If anyone has any objections, please let us 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>
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: longterm-2.6.27/net/can/bcm.c
===================================================================
--- longterm-2.6.27.orig/net/can/bcm.c	2011-01-29 11:22:46.000000000 +0100
+++ longterm-2.6.27/net/can/bcm.c	2011-04-25 17:20:40.456278152 +0200
@@ -121,7 +121,7 @@
 	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)
@@ -1479,7 +1479,7 @@
 
 	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 = create_proc_read_entry(bo->procname, 0644,
 							   proc_dir,
 							   bcm_read_proc, sk);


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