linux-kernel - Re: Is ->sendmsg() allowed to change the msghdr struct it is given?

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Date:   Mon, 26 Jun 2023 14:22:57 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     David Howells <dhowells@...hat.com>
Cc:     Ilya Dryomov <idryomov@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, ceph-devel@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Is ->sendmsg() allowed to change the msghdr struct it is given?

On Mon, 26 Jun 2023 22:14:41 +0100 David Howells wrote:
> Do you know if ->sendmsg() might alter the msghdr struct it is passed as an
> argument? Certainly it can alter msg_iter, but can it also modify,
> say, msg_flags?

I'm not aware of a precedent either way.
Eric or Paolo would know better than me, tho.