This is a note to let you know that I've just added the patch titled
can: j1939: recvmsg(): allow MSG_CMSG_COMPAT flag
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
can-j1939-recvmsg-allow-msg_cmsg_compat-flag.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1db080cbdbab28752bbb1c86d64daf96253a5da1 Mon Sep 17 00:00:00 2001
From: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
Date: Thu, 6 Apr 2023 13:08:45 +0200
Subject: can: j1939: recvmsg(): allow MSG_CMSG_COMPAT flag
From: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
commit 1db080cbdbab28752bbb1c86d64daf96253a5da1 upstream.
The control message provided by J1939 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@xxxxxxxxxxxxxx>
Suggested-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
Tested-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
Acked-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
Link: https://lore.kernel.org/20230505110308.81087-3-mkl@xxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/can/j1939/socket.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/can/j1939/socket.c
+++ b/net/can/j1939/socket.c
@@ -798,7 +798,7 @@ static int j1939_sk_recvmsg(struct socke
struct j1939_sk_buff_cb *skcb;
int ret = 0;
- if (flags & ~(MSG_DONTWAIT | MSG_ERRQUEUE))
+ if (flags & ~(MSG_DONTWAIT | MSG_ERRQUEUE | MSG_CMSG_COMPAT))
return -EINVAL;
if (flags & MSG_ERRQUEUE)
Patches currently in stable-queue which might be from socketcan@xxxxxxxxxxxx are
queue-5.4/can-j1939-recvmsg-allow-msg_cmsg_compat-flag.patch
