linux-hardening - Re: [PATCH v3] batman-adv: Add flex array to struct batadv_tvlv_tt

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Date: Sat, 04 May 2024 11:35:38 +0200
From: Sven Eckelmann <sven@...fation.org>
To: Marek Lindner <mareklindner@...mailbox.ch>,
 Simon Wunderlich <sw@...onwunderlich.de>, Antonio Quartulli <a@...table.cc>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Nathan Chancellor <nathan@...nel.org>,
 Nick Desaulniers <ndesaulniers@...gle.com>, Bill Wendling <morbo@...gle.com>,
 Justin Stitt <justinstitt@...gle.com>, Kees Cook <keescook@...omium.org>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 Erick Archer <erick.archer@...look.com>
Cc: Erick Archer <erick.archer@...look.com>, b.a.t.m.a.n@...ts.open-mesh.org,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 linux-hardening@...r.kernel.org, llvm@...ts.linux.dev,
 Alexander Lobakin <aleksander.lobakin@...el.com>
Subject:
 Re: [PATCH v3] batman-adv: Add flex array to struct batadv_tvlv_tt_data

On Wednesday, 1 May 2024 17:02:42 CEST Erick Archer wrote:
> diff --git a/include/uapi/linux/batadv_packet.h b/include/uapi/linux/batadv_packet.h
> index 6e25753015df..dfbe30536995 100644
> --- a/include/uapi/linux/batadv_packet.h
> +++ b/include/uapi/linux/batadv_packet.h
[...]
> +/**
> + * struct batadv_tvlv_tt_data - tt data propagated through the tt tvlv container
> + * @flags: translation table flags (see batadv_tt_data_flags)
> + * @ttvn: translation table version number
> + * @num_vlan: number of announced VLANs. In the TVLV this struct is followed by
> + *  one batadv_tvlv_tt_vlan_data object per announced vlan
> + * @vlan_data: array of batadv_tvlv_tt_vlan_data objects
> + */
> +struct batadv_tvlv_tt_data {
> +       __u8   flags;
> +       __u8   ttvn;
> +       __be16 num_vlan;
> +       struct batadv_tvlv_tt_vlan_data vlan_data[] __counted_by_be(num_vlan);
> +};

Thanks for the updates. But I can't accept this at the moment because 
__counted_by_be is used in an uapi header without it being defined
include/uapi/linux/stddef.h (and this file is also not included in this 
header).

See commit c8248faf3ca2 ("Compiler Attributes: counted_by: Adjust name and 
identifier expansion") as an example for the similar __counted_by macro.

Kind regards,
	Sven
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