From:   Adnan Dizdarevic <adnan.dizdarevic@eks-intec.de>
To:     "willemdebruijn.kernel@gmail.com" <willemdebruijn.kernel@gmail.com>
CC:     "axboe@kernel.dk" <axboe@kernel.dk>,
        "asml.silence@gmail.com" <asml.silence@gmail.com>,
        "davem@davemloft.net" <davem@davemloft.net>,
        "edumazet@google.com" <edumazet@google.com>,
        "kuba@kernel.org" <kuba@kernel.org>,
        "pabeni@redhat.com" <pabeni@redhat.com>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH] net/packet: Allow MSG_NOSIGNAL flag in packet_recvmsg
Thread-Topic: [PATCH] net/packet: Allow MSG_NOSIGNAL flag in packet_recvmsg
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Date:   Wed, 8 Mar 2023 15:18:55 +0000
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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@eks-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