From 3623ec4f30b1c412f9a6f7e8cceadbb3a306cb13 Mon Sep 17 00:00:00 2001
From: meganz009 <zhang.wenya1@zte.com.cn>
Date: Mon, 17 Jul 2023 16:48:15 +0800
Subject: [PATCH] net/nfc/rawsock.c: add CAP_NET_RAW check.

commit b200620cada4eaa63108be32e040ed557a1965fd upstream.

[ Upstream commit 26896f01467a28651f7a536143fe5ac8449d4041 ]

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

Signed-off-by: Qingyu Li <ieatmuttonchuan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Fixes: CVE-2020-26088
Signed-off-by: Wenya Zhang <zhang.wenya1@zte.com.cn>
Reviewed-by: Xuexin Jiang <jiang.xuexin@zte.com.cn>
---
 net/nfc/rawsock.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/nfc/rawsock.c b/net/nfc/rawsock.c
index e2188deb08dc..b927730d9ab0 100644
--- a/net/nfc/rawsock.c
+++ b/net/nfc/rawsock.c
@@ -344,10 +344,13 @@ 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
+	} else {
 		sock->ops = &rawsock_ops;
+	}
 
 	sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto, kern);
 	if (!sk)
-- 
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