linux-hardening - Re: [PATCH net-next v2] netdevice: define and allocate &net_device _properly

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Message-ID: <Zo2b6DJDMXLm/dBK@gmail.com>
Date: Tue, 9 Jul 2024 13:22:00 -0700
From: Breno Leitao <leitao@...ian.org>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	keescook@...omium.org, horms@...nel.org,
	nex.sw.ncis.osdt.itp.upstreaming@...el.com,
	linux-hardening@...r.kernel.org,
	Alexander Lobakin <aleksander.lobakin@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Jiri Pirko <jiri@...nulli.us>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Daniel Borkmann <daniel@...earbox.net>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Johannes Berg <johannes.berg@...el.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	"open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v2] netdevice: define and allocate &net_device
 _properly_

On Tue, Jul 09, 2024 at 08:27:45AM -0700, Eric Dumazet wrote:
> On Tue, Jul 9, 2024 at 5:54 AM Breno Leitao <leitao@...ian.org> wrote:

> > @@ -2596,7 +2599,7 @@ void dev_net_set(struct net_device *dev, struct net *net)
> >   */
> >  static inline void *netdev_priv(const struct net_device *dev)
> >  {
> > -       return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
> > +       return (void *)dev->priv;

> Minor remark : the cast is not needed, but this is fine.

Thanks. I will fix it in a v3, which needs to be done to address some
kernel-doc warnings identified by Simon..

> It would be great to get rid of NETDEV_ALIGN eventually.

Would you mind sharing what do you have in mind? What do you use as a
replacement?

Thanks