linux-kernel - [ 12/82] proc connector: reject unprivileged listener bumps

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Date:	Mon, 18 Mar 2013 04:21:56 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, Kees Cook <keescook@...omium.org>,
	Evgeniy Polyakov <zbr@...emap.net>,
	Matt Helsley <matthltc@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 12/82] proc connector: reject unprivileged listener bumps

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kees Cook <keescook@...omium.org>

commit e70ab977991964a5a7ad1182799451d067e62669 upstream.

While PROC_CN_MCAST_LISTEN/IGNORE is entirely advisory, it was possible
for an unprivileged user to turn off notifications for all listeners by
sending PROC_CN_MCAST_IGNORE. Instead, require the same privileges as
required for a multicast bind.

Signed-off-by: Kees Cook <keescook@...omium.org>
Cc: Evgeniy Polyakov <zbr@...emap.net>
Cc: Matt Helsley <matthltc@...ibm.com>
Acked-by: Evgeniy Polyakov <zbr@...emap.net>
Acked-by: Matt Helsley <matthltc@...ibm.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/connector/cn_proc.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/connector/cn_proc.c
+++ b/drivers/connector/cn_proc.c
@@ -303,6 +303,12 @@ static void cn_proc_mcast_ctl(struct cn_
 	if (msg->len != sizeof(*mc_op))
 		return;
 
+	/* Can only change if privileged. */
+	if (!capable(CAP_NET_ADMIN)) {
+		err = EPERM;
+		goto out;
+	}
+
 	mc_op = (enum proc_cn_mcast_op*)msg->data;
 	switch (*mc_op) {
 	case PROC_CN_MCAST_LISTEN:
@@ -315,6 +321,8 @@ static void cn_proc_mcast_ctl(struct cn_
 		err = EINVAL;
 		break;
 	}
+
+out:
 	cn_proc_ack(err, msg->seq, msg->ack);
 }
 


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