linux-hardening - Re: [PATCH v2][wireless-next/for-next] wifi: mt76: mt7996: Use DECLARE_FLEX

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Message-ID: <170264697580.1759617.6397953788753678096.kvalo@kernel.org>
Date: Fri, 15 Dec 2023 13:29:37 +0000 (UTC)
From: Kalle Valo <kvalo@...nel.org>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: 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,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2][wireless-next/for-next] wifi: mt76: mt7996: Use
 DECLARE_FLEX_ARRAY() and fix -Warray-bounds warnings

"Gustavo A. R. Silva" <gustavoars@...nel.org> wrote:

> Transform zero-length arrays `rate`, `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:544:61: warning: array subscript <unknown> is outside array bounds of 'struct <anonymous>[0]' [-Warray-bounds=]
> drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:551:58: warning: array subscript <unknown> is outside array bounds of 'struct <anonymous>[0]' [-Warray-bounds=]
> drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:553:58: warning: array subscript <unknown> is outside array bounds of 'struct <anonymous>[0]' [-Warray-bounds=]
> drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:530:61: warning: array subscript <unknown> is outside array bounds of 'struct <anonymous>[0]' [-Warray-bounds=]
> drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:538:66: warning: array subscript <unknown> is outside array bounds of 'struct <anonymous>[0]' [-Warray-bounds=]
> drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:540:66: warning: array subscript <unknown> is outside array bounds of 'struct <anonymous>[0]' [-Warray-bounds=]
> drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:520:57: warning: array subscript <unknown> is outside array bounds of 'struct all_sta_trx_rate[0]' [-Warray-bounds=]
> drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:526:76: warning: array subscript <unknown> is outside array bounds of 'struct all_sta_trx_rate[0]' [-Warray-bounds=]
> drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:526:76: warning: array subscript <unknown> is outside array bounds of 'struct all_sta_trx_rate[0]' [-Warray-bounds=]
> drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:526:76: warning: array subscript <unknown> is outside array bounds of 'struct all_sta_trx_rate[0]' [-Warray-bounds=]
> drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:526:76: warning: array subscript <unknown> is outside array bounds of 'struct all_sta_trx_rate[0]' [-Warray-bounds=]
> 
> This results in no differences in binary output, helps with the ongoing
> efforts to globally enable -Warray-bounds.
> 
> Reviewed-by: Kees Cook <keescook@...omium.org>
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

I'll take this directly wireless-next, ok?

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/ZXiU9ayVCslt3qiI@work/

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