linux-kernel - Re: [PATCH v8 net-next 01/15] net: pppoe: avoid zero-length arrays in struct pppoe

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Message-ID: <b3b5418c-65d5-48bf-8868-2d9abcb4f758@blackwall.org>
Date: Wed, 5 Mar 2025 10:21:33 +0200
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: Eric Woudstra <ericwouds@...il.com>,
 Michal Ostrowski <mostrows@...thlink.net>,
 Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Simon Horman <horms@...nel.org>, Pablo Neira Ayuso <pablo@...filter.org>,
 Jozsef Kadlecsik <kadlec@...filter.org>, Jiri Pirko <jiri@...nulli.us>,
 Ivan Vecera <ivecera@...hat.com>, Roopa Prabhu <roopa@...dia.com>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Kuniyuki Iwashima <kuniyu@...zon.com>,
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 Ahmed Zaki <ahmed.zaki@...el.com>,
 Alexander Lobakin <aleksander.lobakin@...el.com>,
 Vladimir Oltean <olteanv@...il.com>,
 Frank Wunderlich <frank-w@...lic-files.de>,
 Daniel Golle <daniel@...rotopia.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 netfilter-devel@...r.kernel.org, coreteam@...filter.org,
 bridge@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org, linux-hardening@...r.kernel.org,
 Kees Cook <kees@...nel.org>, "Gustavo A. R. Silva" <gustavoars@...nel.org>
Subject: Re: [PATCH v8 net-next 01/15] net: pppoe: avoid zero-length arrays in
 struct pppoe_hdr

On 2/28/25 22:15, Eric Woudstra wrote:
> Jakub Kicinski suggested following patch:
> 
> W=1 C=1 GCC build gives us:
> 
> net/bridge/netfilter/nf_conntrack_bridge.c: note: in included file (through
> ../include/linux/if_pppox.h, ../include/uapi/linux/netfilter_bridge.h,
> ../include/linux/netfilter_bridge.h): include/uapi/linux/if_pppox.h:
> 153:29: warning: array of flexible structures
> 
> It doesn't like that hdr has a zero-length array which overlaps proto.
> The kernel code doesn't currently need those arrays.
> 
> PPPoE connection is functional after applying this patch.
> 
> Signed-off-by: Eric Woudstra <ericwouds@...il.com>
> ---
>  drivers/net/ppp/pppoe.c       | 2 +-
>  include/uapi/linux/if_pppox.h | 4 ++++
>  2 files changed, 5 insertions(+), 1 deletion(-)
> 

Reviewed-by: Nikolay Aleksandrov <razor@...ckwall.org>