linux-hardening - Re: [PATCH][next] wifi: rndis_wlan: Replace fake flex-array with flexible-array member

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Date:   Thu, 30 Mar 2023 14:09:20 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Jussi Kivilinna <jussi.kivilinna@....fi>,
        Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] wifi: rndis_wlan: Replace fake flex-array with
 flexible-array member

Hi all,

Friendly ping: who can take this, please? 😄

Thanks
-- 
Gustavo

On 3/22/23 12:26, Gustavo A. R. Silva wrote:
> Zero-length arrays as fake flexible arrays are deprecated and we are
> moving towards adopting C99 flexible-array members instead.
> 
> Address the following warning found with GCC-13 and
> -fstrict-flex-array=3 enabled:
> drivers/net/wireless/rndis_wlan.c:2902:23: warning: array subscript 0 is outside array bounds of ‘struct ndis_80211_auth_request[0]’ [-Warray-bounds=]
> 
> This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
> routines on memcpy() and help us make progress towards globally
> enabling -fstrict-flex-arrays=3 [1].
> 
> Link: https://github.com/KSPP/linux/issues/21
> Link: https://github.com/KSPP/linux/issues/274
> Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1]
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
>   drivers/net/wireless/legacy/rndis_wlan.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/legacy/rndis_wlan.c b/drivers/net/wireless/legacy/rndis_wlan.c
> index bf72e5fd39cf..54c347fa54c4 100644
> --- a/drivers/net/wireless/legacy/rndis_wlan.c
> +++ b/drivers/net/wireless/legacy/rndis_wlan.c
> @@ -209,7 +209,7 @@ struct ndis_80211_status_indication {
>   	union {
>   		__le32					media_stream_mode;
>   		__le32					radio_status;
> -		struct ndis_80211_auth_request		auth_request[0];
> +		DECLARE_FLEX_ARRAY(struct ndis_80211_auth_request, auth_request);
>   		struct ndis_80211_pmkid_cand_list	cand_list;
>   	} u;
>   } __packed;