linux-hardening - Re: [PATCH v4 7/8] net-device: Use new helpers from overflow.h in netdevice APIs

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Date: Wed, 28 Feb 2024 17:15:09 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc: Kees Cook <keescook@...omium.org>, Andy Shevchenko
 <andriy.shevchenko@...ux.intel.com>, Vinod Koul <vkoul@...nel.org>, Linus
 Walleij <linus.walleij@...aro.org>, Jonathan Cameron
 <Jonathan.Cameron@...wei.com>, Mark Brown <broonie@...nel.org>,
 linux-arm-kernel@...ts.infradead.org, dmaengine@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
 linux-spi@...r.kernel.org, netdev@...r.kernel.org,
 linux-hardening@...r.kernel.org, Jonathan Cameron <jic23@...nel.org>,
 Lars-Peter Clausen <lars@...afoo.de>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, "Gustavo A. R. Silva" <gustavoars@...nel.org>
Subject: Re: [PATCH v4 7/8] net-device: Use new helpers from overflow.h in
 netdevice APIs

On Wed, 28 Feb 2024 19:03:12 -0600 Gustavo A. R. Silva wrote:
> On 2/28/24 18:57, Jakub Kicinski wrote:
> > On Wed, 28 Feb 2024 18:49:25 -0600 Gustavo A. R. Silva wrote:  
> >> struct net_device {
> >> 	struct_group_tagged(net_device_hdr, hdr,
> >> 		...
> >> 		u32			priv_size;
> >> 	);
> >> 	u8			priv_data[] __counted_by(priv_size) __aligned(NETDEV_ALIGN);
> >> }  
> > 
> > No, no, that's not happening.  
> 
> Thanks, one less flex-struct to change. :)

I like the flex struct.
I don't like struct group around a 360LoC declaration just to avoid
having to fix up a handful of users.