linux-kernel - Re: [PATCH v2 2/3] net/compat: Update msg_control_is

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Message-ID: <20230413140713.GA16625@lst.de>
Date:   Thu, 13 Apr 2023 16:07:13 +0200
From:   Christoph Hellwig <hch@....de>
To:     Kevin Brodsky <kevin.brodsky@....com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH v2 2/3] net/compat: Update msg_control_is_user when
 setting a kernel pointer

On Thu, Apr 13, 2023 at 12:47:04PM +0100, Kevin Brodsky wrote:
> cmsghdr_from_user_compat_to_kern() is an unusual case w.r.t. how
> the kmsg->msg_control* fields are used. The input struct msghdr
> holds a pointer to a user buffer, i.e. ksmg->msg_control_user is
> active. However, upon success, a kernel pointer is stored in
> kmsg->msg_control. kmsg->msg_control_is_user should therefore be
> updated accordingly.

Looks good:

Reviewed-by: Christoph Hellwig <hch@....de>