linux-kernel - [PATCH] net/packet: Allow MSG_NOSIGNAL flag in packet

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Date:   Wed, 8 Mar 2023 15:18:55 +0000
From:   Adnan Dizdarevic <adnan.dizdarevic@...-intec.de>
To:     "willemdebruijn.kernel@...il.com" <willemdebruijn.kernel@...il.com>
CC:     "axboe@...nel.dk" <axboe@...nel.dk>,
        "asml.silence@...il.com" <asml.silence@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] net/packet: Allow MSG_NOSIGNAL flag in packet_recvmsg

By adding MSG_NOSIGNAL flag to allowed flags in packet_recvmsg, this
patch fixes io_uring recvmsg operations returning -EINVAL when used with
packet socket file descriptors.

In io_uring, MSG_NOSIGNAL flag is added in:
io_uring/net.c/io_recvmsg_prep

Signed-off-by: Adnan Dizdarevic <adnan.dizdarevic@...-intec.de>
---
 net/packet/af_packet.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index d4e76e2ae153..5ce62194af9e 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -3410,7 +3410,8 @@ static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
 	unsigned int origlen = 0;
 
 	err = -EINVAL;
-	if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
+	if (flags & ~(MSG_PEEK | MSG_DONTWAIT | MSG_TRUNC | MSG_CMSG_COMPAT |
+			MSG_ERRQUEUE | MSG_NOSIGNAL))
 		goto out;
 
 #if 0
-- 
2.37.2