netdev - Re: [PATCH net-next v6 01/18] net: Declare MSG_SPLICE

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Date:   Thu, 13 Apr 2023 21:39:22 +0100
From:   David Howells <dhowells@...hat.com>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     dhowells@...hat.com, netdev@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        David Ahern <dsahern@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Christoph Hellwig <hch@...radead.org>,
        Jens Axboe <axboe@...nel.dk>, Jeff Layton <jlayton@...nel.org>,
        Christian Brauner <brauner@...nel.org>,
        Chuck Lever III <chuck.lever@...cle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net-next v6 01/18] net: Declare MSG_SPLICE_PAGES internal sendmsg() flag

Al Viro <viro@...iv.linux.org.uk> wrote:

> Note that io_sendmsg_prep() handles both IORING_OP_SENDMSG and IORING_OP_SEND,
> so this pair of functions can hit the same request.  And sqe->msg_flags is
> not sanitized at all - it comes straight from user buffer.

Assuming ____sys_sendmsg() is fixed, I think it should be sufficient to make
io_send() and io_send_zc().  io_sendmsg() and io_sendmsg_zc() will go through
____sys_sendmsg().

David