linux-hardening - Re: [PATCH] netdev: Use flexible array for trailing private bytes

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Message-ID: <20240301093517.428e5b5d@kernel.org>
Date: Fri, 1 Mar 2024 09:35:17 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Alexander Lobakin <aleksander.lobakin@...el.com>
Cc: Eric Dumazet <edumazet@...gle.com>, Kees Cook <keescook@...omium.org>,
 "David S. Miller" <davem@...emloft.net>, Paolo Abeni <pabeni@...hat.com>,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, "Gustavo A. R. Silva"
 <gustavoars@...nel.org>, <netdev@...r.kernel.org>,
 <linux-hardening@...r.kernel.org>, Simon Horman <horms@...nel.org>, "Jiri
 Pirko" <jiri@...nulli.us>, Daniel Borkmann <daniel@...earbox.net>, Coco Li
 <lixiaoyan@...gle.com>, Amritha Nambiar <amritha.nambiar@...el.com>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] netdev: Use flexible array for trailing private bytes

On Fri, 1 Mar 2024 15:30:03 +0100 Alexander Lobakin wrote:
> I like the idea of declaring priv explicitly rather than doing size +
> ptr magic. But maybe we could just add this flex array to struct
> net_device and avoid introducing a new structure.

100% I should have linked to the thread that led to Kees's work.
Adding directly to net_device would be way better but there's
a handful of drivers which embed the struct.
If we can switch them to dynamic allocation, that'd be great.
And, as you may be alluding to, it removes the need for the WARN_ON()
entirely as well.