linux-hardening - Re: [PATCH][next] wifi: mt76: mt7996: Use DECLARE_FLEX

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Date: Mon, 04 Dec 2023 10:37:50 +0200
From: Kalle Valo <kvalo@...nel.org>
To: Kees Cook <keescook@...omium.org>
Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>,  Felix Fietkau
 <nbd@....name>,  Lorenzo Bianconi <lorenzo@...nel.org>,  Ryder Lee
 <ryder.lee@...iatek.com>,  Shayne Chen <shayne.chen@...iatek.com>,  Sean
 Wang <sean.wang@...iatek.com>,  Matthias Brugger <matthias.bgg@...il.com>,
  AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
  linux-wireless@...r.kernel.org,  linux-kernel@...r.kernel.org,
  linux-arm-kernel@...ts.infradead.org,
  linux-mediatek@...ts.infradead.org,  linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] wifi: mt76: mt7996: Use DECLARE_FLEX_ARRAY() and
 fix -Warray-bounds warnings

Kees Cook <keescook@...omium.org> writes:

> On Thu, Nov 16, 2023 at 02:57:24PM -0600, Gustavo A. R. Silva wrote:
>
>> Transform zero-length arrays `adm_stat` and `msdu_cnt` into proper
>> flexible-array members in anonymous union in `struct
>> mt7996_mcu_all_sta_info_event` via the DECLARE_FLEX_ARRAY()
>> helper; and fix multiple -Warray-bounds warnings:
>> 
>> drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:483:61: warning:
>> array subscript <unknown> is outside array bounds of 'struct
>> <anonymous>[0]' [-Warray-bounds=]
>> drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:490:58: warning:
>> array subscript <unknown> is outside array bounds of 'struct
>> <anonymous>[0]' [-Warray-bounds=]
>> drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:492:58: warning:
>> array subscript <unknown> is outside array bounds of 'struct
>> <anonymous>[0]' [-Warray-bounds=]
>> drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:469:61: warning:
>> array subscript <unknown> is outside array bounds of 'struct
>> <anonymous>[0]' [-Warray-bounds=]
>> drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:477:66: warning:
>> array subscript <unknown> is outside array bounds of 'struct
>> <anonymous>[0]' [-Warray-bounds=]
>> drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:479:66: warning:
>> array subscript <unknown> is outside array bounds of 'struct
>> <anonymous>[0]' [-Warray-bounds=]
>> 
>> This results in no differences in binary output, helps with the ongoing
>> efforts to globally enable -Warray-bounds.
>> 
>> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
>
> *thread ping*
>
> Can wireless folks please pick this patch up?

Ok, I assigned this to me on patchwork now. Felix, please let me know if
you prefer to take this to your tree instead.

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches