netdev - [PATCH net 1/9] can: isotp: recvmsg(): allow MSG_CMSG

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Message-Id: <20230515204722.1000957-2-mkl@pengutronix.de>
Date: Mon, 15 May 2023 22:47:14 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	kuba@...nel.org,
	linux-can@...r.kernel.org,
	kernel@...gutronix.de,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Oleksij Rempel <o.rempel@...gutronix.de>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	stable@...r.kernel.org
Subject: [PATCH net 1/9] can: isotp: recvmsg(): allow MSG_CMSG_COMPAT flag

From: Oliver Hartkopp <socketcan@...tkopp.net>

The control message provided by isotp support MSG_CMSG_COMPAT but
blocked recvmsg() syscalls that have set this flag, i.e. on 32bit user
space on 64 bit kernels.

Link: https://github.com/hartkopp/can-isotp/issues/59
Cc: Oleksij Rempel <o.rempel@...gutronix.de>
Suggested-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Oliver Hartkopp <socketcan@...tkopp.net>
Fixes: 42bf50a1795a ("can: isotp: support MSG_TRUNC flag when reading from socket")
Link: https://lore.kernel.org/20230505110308.81087-2-mkl@pengutronix.de
Cc: stable@...r.kernel.org
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 net/can/isotp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/can/isotp.c b/net/can/isotp.c
index a750259cb79c..84f9aba02901 100644
--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -1139,7 +1139,7 @@ static int isotp_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 	struct isotp_sock *so = isotp_sk(sk);
 	int ret = 0;
 
-	if (flags & ~(MSG_DONTWAIT | MSG_TRUNC | MSG_PEEK))
+	if (flags & ~(MSG_DONTWAIT | MSG_TRUNC | MSG_PEEK | MSG_CMSG_COMPAT))
 		return -EINVAL;
 
 	if (!so->bound)

base-commit: df0acdc59b094cdaef19b1c8d83c9721082bab7b
-- 
2.39.2