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

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Message-ID: <CANn89iKeJGvhY0K=kLhhR39NVbaizP2UBk0Vk0r_XCe2XMBZHg@mail.gmail.com>
Date: Fri, 1 Mar 2024 09:03:55 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: 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, Mar 1, 2024 at 7:59 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Thu, 29 Feb 2024 13:30:22 -0800 Kees Cook wrote:

> > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> > index 118c40258d07..b476809d0bae 100644
> > --- a/include/linux/netdevice.h
> > +++ b/include/linux/netdevice.h
> > @@ -1815,6 +1815,8 @@ enum netdev_stat_type {
> >       NETDEV_PCPU_STAT_DSTATS, /* struct pcpu_dstats */
> >  };
> >
> > +#define      NETDEV_ALIGN            32
>
> Unless someone knows what this is for it should go.
> Align priv to cacheline size.

+2

#define NETDEV_ALIGN    L1_CACHE_BYTES

or a general replacement of NETDEV_ALIGN....