netdev - Is ->sendmsg() allowed to change the msghdr struct it is given?

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Message-ID: <3112097.1687814081@warthog.procyon.org.uk>
Date: Mon, 26 Jun 2023 22:14:41 +0100
From: David Howells <dhowells@...hat.com>
To: Jakub Kicinski <kuba@...nel.org>
cc: dhowells@...hat.com, 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: Is ->sendmsg() allowed to change the msghdr struct it is given?

Hi Jakub,

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?

Thanks,
David