linux-hardening - Re: [PATCH] p54: Remove unused struct pda_antenna

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Message-ID: <c7805e64-57b5-5fa6-ff93-e37dcc01c40c@gmail.com>
Date:   Fri, 18 Nov 2022 23:53:48 +0100
From:   Christian Lamparter <chunkeey@...il.com>
To:     Kees Cook <keescook@...omium.org>,
        Christian Lamparter <chunkeey@...glemail.com>
Cc:     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>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] p54: Remove unused struct pda_antenna_gain

On 11/18/22 22:06, Kees Cook wrote:
> Remove struct pda_antenna_gain. It was unused and was using
> deprecated 0-length arrays[1].


I would like to keep it around. This struct is documenting what's coded
in the PDR_ANTENNA_GAIN eeprom (specifically that units value
(0.25 dBi units)).

> [1] https://github.com/KSPP/linux/issues/78
> 
> Cc: Christian Lamparter <chunkeey@...glemail.com>
> Cc: Kalle Valo <kvalo@...nel.org>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Paolo Abeni <pabeni@...hat.com>
> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
> Cc: linux-wireless@...r.kernel.org
> Cc: netdev@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>   drivers/net/wireless/intersil/p54/eeprom.h | 7 -------
>   1 file changed, 7 deletions(-)
> 
> diff --git a/drivers/net/wireless/intersil/p54/eeprom.h b/drivers/net/wireless/intersil/p54/eeprom.h
> index 1d0aaf54389a..10b6d96aa49e 100644
> --- a/drivers/net/wireless/intersil/p54/eeprom.h
> +++ b/drivers/net/wireless/intersil/p54/eeprom.h
> @@ -107,13 +107,6 @@ struct pda_country {
>   	u8 flags;
>   } __packed;
>   
> -struct pda_antenna_gain {
> -	struct {
> -		u8 gain_5GHz;	/* 0.25 dBi units */
> -		u8 gain_2GHz;	/* 0.25 dBi units */
> -	} __packed antenna[0];
> -} __packed;
> -
>   struct pda_custom_wrapper {
>   	__le16 entries;
>   	__le16 entry_size;