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Date:   Tue, 18 Aug 2020 16:33:57 +0800
From:   Qingyu Li <ieatmuttonchuan@...il.com>
To:     marcel@...tmann.org, johan.hedberg@...il.com, davem@...emloft.net,
        kuba@...nel.org, matthieu.baerts@...sares.net,
        stefan@...enfreihafen.org, arnd@...db.de, gustavoars@...nel.org,
        bigeasy@...utronix.de
Cc:     linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net/bluetooth/rfcomm/sock.c: add CAP_NET_RAW check.

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

Signed-off-by: Qingyu Li <ieatmuttonchuan@...il.com>
---
 net/bluetooth/rfcomm/sock.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index ae6f80730561..d67d49e5aa00 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -321,6 +321,9 @@ static int rfcomm_sock_create(struct net *net, struct socket *sock,
 	if (sock->type != SOCK_STREAM && sock->type != SOCK_RAW)
 		return -ESOCKTNOSUPPORT;

+	if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
+		return -EPERM;
+
 	sock->ops = &rfcomm_sock_ops;

 	sk = rfcomm_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
--
2.17.1

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