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

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Message-ID: <20230626142257.6e14a801@kernel.org>
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.