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

[Jakub Kicinski]

On Wed, 28 Feb 2024 13:46:10 -0800 Kees Cook wrote:
> I really don't like hiding these trailing allocations from the compiler.
> Why can't something like this be done (totally untested):
> 
> 
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 118c40258d07..dae6df4fb177 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -2475,6 +2475,8 @@ struct net_device {
>  	/** @page_pools: page pools created for this netdevice */
>  	struct hlist_head	page_pools;
>  #endif
> +	u32			priv_size;
> +	u8			priv_data[] __counted_by(priv_size) __aligned(NETDEV_ALIGN);

I like, FWIW, please submit! :)