linux-kernel - Re: [RFC PATCH v2 0/2] vsock: handle writes to shutdowned socket

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Date:   Thu, 31 Aug 2023 17:23:22 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Arseniy Krasnov <avkrasnov@...utedevices.com>
Cc:     Stefan Hajnoczi <stefanha@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Bobby Eshleman <bobby.eshleman@...edance.com>,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...rdevices.ru, oxffffaa@...il.com
Subject: Re: [RFC PATCH v2 0/2] vsock: handle writes to shutdowned socket

Hi Arseniy,

On Sat, Aug 26, 2023 at 08:58:58PM +0300, Arseniy Krasnov wrote:
>Hello,
>
>this small patchset adds POSIX compliant behaviour on writes to the
>socket which was shutdowned with 'shutdown()' (both sides - local with
>SHUT_WR flag, peer - with SHUT_RD flag). According POSIX we must send
>SIGPIPE in such cases (but SIGPIPE is not send when MSG_NOSIGNAL is set).
>
>First patch is implemented in the same way as net/ipv4/tcp.c:tcp_sendmsg_locked().
>It uses 'sk_stream_error()' function which handles EPIPE error. Another
>way is to use code from net/unix/af_unix.c:unix_stream_sendmsg() where
>same logic from 'sk_stream_error()' is implemented "from scratch", but
>it doesn't check 'sk_err' field. I think error from this field has more
>priority to be returned from syscall. So I guess it is better to reuse
>currently implemented 'sk_stream_error()' function.
>
>Test is also added.
>
>Head for this patchset is:
>https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=b38460bc463c54e0c15ff3b37e81f7e2059bb9bb
>
>Link to v1:
>https://lore.kernel.org/netdev/20230801141727.481156-1-AVKrasnov@sberdevices.ru/
>
>Changelog:
>v1 -> v2:
> * 0001 stills the same - SIGPIPE is sent only for SOCK_STREAM as discussed in v1
>   with Stefano Garzarella <sgarzare@...hat.com>.
> * 0002 - use 'sig_atomic_t' instead of 'bool' for flag variables updated from
>   signal handler.
>
>Arseniy Krasnov (2):
>  vsock: send SIGPIPE on write to shutdowned socket
>  test/vsock: shutdowned socket test

Thanks for this series, I fully reviewed it, LGTM!

Please send it targeting net-next when it reopens.

Stefano