linux-kernel - [PATCH] nfc: enforce CAP_NET_RAW for raw sockets When creating a raw AF_NFC socket, CAP_NET

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Date:   Thu, 6 Aug 2020 10:28:08 +0800
From:   Qingyu Li <ieatmuttonchuan@...il.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] nfc: enforce CAP_NET_RAW for raw sockets When creating a raw
 AF_NFC socket, CAP_NET_RAW needs to be checked first.

Signed-off-by: Qingyu Li <ieatmuttonchuan@...il.com>
---
 net/nfc/rawsock.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/nfc/rawsock.c b/net/nfc/rawsock.c
index ba5ffd3badd3..c1302b689a98 100644
--- a/net/nfc/rawsock.c
+++ b/net/nfc/rawsock.c
@@ -332,8 +332,11 @@ static int rawsock_create(struct net *net, struct socket *sock,
 	if ((sock->type != SOCK_SEQPACKET) && (sock->type != SOCK_RAW))
 		return -ESOCKTNOSUPPORT;

-	if (sock->type == SOCK_RAW)
+	if (sock->type == SOCK_RAW){
+		if (!capable(CAP_NET_RAW))
+			return -EPERM;
 		sock->ops = &rawsock_raw_ops;
+	}
 	else
 		sock->ops = &rawsock_ops;