Bluetooth: Restrict application of socket options

The new socket options should only be evaluated for SOL_BLUETOOTH level
and not for every other level. Previously this causes some minor issues
when detecting if a kernel with certain features is available.

Also restrict BT_SECURITY to SOCK_SEQPACKET for L2CAP and SOCK_STREAM for
the RFCOMM protocol.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/l2cap.c

@@ -1248,10 +1248,18 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, ch
 	if (level == SOL_L2CAP)
 		return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
 
+	if (level != SOL_BLUETOOTH)
+		return -ENOPROTOOPT;
+
 	lock_sock(sk);
 
 	switch (optname) {
 	case BT_SECURITY:
+		if (sk->sk_type != SOCK_SEQPACKET) {
+			err = -EINVAL;
+			break;
+		}
+
 		sec.level = BT_SECURITY_LOW;
 
 		len = min_t(unsigned int, sizeof(sec), optlen);
@@ -1384,13 +1392,21 @@ static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, ch
 	if (level == SOL_L2CAP)
 		return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
 
+	if (level != SOL_BLUETOOTH)
+		return -ENOPROTOOPT;
+
 	if (get_user(len, optlen))
 		return -EFAULT;
 
 	lock_sock(sk);
 
 	switch (optname) {
 	case BT_SECURITY:
+		if (sk->sk_type != SOCK_SEQPACKET) {
+			err = -EINVAL;
+			break;
+		}
+
 		sec.level = l2cap_pi(sk)->sec_level;
 
 		len = min_t(unsigned int, len, sizeof(sec));

net/bluetooth/rfcomm/sock.c

@@ -778,10 +778,18 @@ static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, c
 	if (level == SOL_RFCOMM)
 		return rfcomm_sock_setsockopt_old(sock, optname, optval, optlen);
 
+	if (level != SOL_BLUETOOTH)
+		return -ENOPROTOOPT;
+
 	lock_sock(sk);
 
 	switch (optname) {
 	case BT_SECURITY:
+		if (sk->sk_type != SOCK_STREAM) {
+			err = -EINVAL;
+			break;
+		}
+
 		sec.level = BT_SECURITY_LOW;
 
 		len = min_t(unsigned int, sizeof(sec), optlen);
@@ -899,13 +907,21 @@ static int rfcomm_sock_getsockopt(struct socket *sock, int level, int optname, c
 	if (level == SOL_RFCOMM)
 		return rfcomm_sock_getsockopt_old(sock, optname, optval, optlen);
 
+	if (level != SOL_BLUETOOTH)
+		return -ENOPROTOOPT;
+
 	if (get_user(len, optlen))
 		return -EFAULT;
 
 	lock_sock(sk);
 
 	switch (optname) {
 	case BT_SECURITY:
+		if (sk->sk_type != SOCK_STREAM) {
+			err = -EINVAL;
+			break;
+		}
+
 		sec.level = rfcomm_pi(sk)->sec_level;
 
 		len = min_t(unsigned int, len, sizeof(sec));