linux-kernel - [PATCH 3.16 21/25] appletalk: enforce CAP_NET

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Message-ID: <lsq.1573602477.355052883@decadent.org.uk>
Date:   Tue, 12 Nov 2019 23:48:18 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Ori Nimron" <orinimron123@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: [PATCH 3.16 21/25] appletalk: enforce CAP_NET_RAW for raw sockets

3.16.77-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Ori Nimron <orinimron123@...il.com>

commit 6cc03e8aa36c51f3b26a0d21a3c4ce2809c842ac upstream.

When creating a raw AF_APPLETALK socket, CAP_NET_RAW needs to be checked
first.

Signed-off-by: Ori Nimron <orinimron123@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/appletalk/ddp.c | 5 +++++
 1 file changed, 5 insertions(+)

--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -1029,6 +1029,11 @@ static int atalk_create(struct net *net,
 	 */
 	if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
 		goto out;
+
+	rc = -EPERM;
+	if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
+		goto out;
+
 	rc = -ENOMEM;
 	sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto);
 	if (!sk)