[PATCH] net/packet: Allow MSG_NOSIGNAL flag in packet_recvmsg

[PATCH] net/packet: Allow MSG_NOSIGNAL flag in packet_recvmsg

[Adnan Dizdarevic]

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

Re: [PATCH] net/packet: Allow MSG_NOSIGNAL flag in packet_recvmsg

[Jens Axboe]

On 3/8/23 8:18 AM, Adnan Dizdarevic wrote:
> 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

FWIW, this did get fixed in io_uring, it's in 6.3-rc1 and is making
its way into the stable releases too:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7605c43d67face310b4b87dee1a28bc0c8cd8c0f

-- 
Jens Axboe

RE: [PATCH] net/packet: Allow MSG_NOSIGNAL flag in packet_recvmsg

[Willem de Bruijn]

Adnan Dizdarevic wrote:
> 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>

This was discussed two weeks ago and io_uring adapted to no longer
require this change.

https://lore.kernel.org/netdev/Y%2Fja3Wi0tIyzXces@eidolon.nox.tf/T/

RE: [PATCH] net/packet: Allow MSG_NOSIGNAL flag in packet_recvmsg

[Adnan Dizdarevic]

Thanks for the update. I didn't notice it got fixed in the meantime.

-----Original Message-----
From: Willem de Bruijn <willemdebruijn.kernel@gmail.com> 
Sent: 08 March 2023 16:38
To: Adnan Dizdarevic <adnan.dizdarevic@eks-intec.de>; willemdebruijn.kernel@gmail.com
Cc: axboe@kernel.dk; asml.silence@gmail.com; davem@davemloft.net; edumazet@google.com; kuba@kernel.org; pabeni@redhat.com; netdev@vger.kernel.org; linux-kernel@vger.kernel.org
Subject: RE: [PATCH] net/packet: Allow MSG_NOSIGNAL flag in packet_recvmsg

Adnan Dizdarevic wrote:
> 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>

This was discussed two weeks ago and io_uring adapted to no longer require this change.

https://lore.kernel.org/netdev/Y%2Fja3Wi0tIyzXces@eidolon.nox.tf/T/