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From: Kees Cook <keescook@chromium.org>
To: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: Felix Fietkau <nbd@nbd.name>,
	Lorenzo Bianconi <lorenzo@kernel.org>,
	Ryder Lee <ryder.lee@mediatek.com>,
	Shayne Chen <shayne.chen@mediatek.com>,
	Sean Wang <sean.wang@mediatek.com>, Kalle Valo <kvalo@kernel.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	AngeloGioacchino Del Regno
	<angelogioacchino.delregno@collabora.com>,
	linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org,
	linux-hardening@vger.kernel.org
Subject: Re: [PATCH][next] wifi: mt76: mt7996: Use DECLARE_FLEX_ARRAY() and fix -Warray-bounds warnings
Date: Thu, 16 Nov 2023 13:05:07 -0800	[thread overview]
Message-ID: <202311161304.3B03C95B3@keescook> (raw)
In-Reply-To: <ZVaCNAohuieMmdq9@work>

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@kernel.org>

The syntax looks a little funny initially, but yeah, that's how we need
to fix it for now.

Reviewed-by: Kees Cook <keescook@chromium.org>

-- 
Kees Cook

WARNING: multiple messages have this Message-ID (diff)
From: Kees Cook <keescook@chromium.org>
To: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: Felix Fietkau <nbd@nbd.name>,
	Lorenzo Bianconi <lorenzo@kernel.org>,
	Ryder Lee <ryder.lee@mediatek.com>,
	Shayne Chen <shayne.chen@mediatek.com>,
	Sean Wang <sean.wang@mediatek.com>, Kalle Valo <kvalo@kernel.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	AngeloGioacchino Del Regno
	<angelogioacchino.delregno@collabora.com>,
	linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org,
	linux-hardening@vger.kernel.org
Subject: Re: [PATCH][next] wifi: mt76: mt7996: Use DECLARE_FLEX_ARRAY() and fix -Warray-bounds warnings
Date: Thu, 16 Nov 2023 13:05:07 -0800	[thread overview]
Message-ID: <202311161304.3B03C95B3@keescook> (raw)
In-Reply-To: <ZVaCNAohuieMmdq9@work>

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@kernel.org>

The syntax looks a little funny initially, but yeah, that's how we need
to fix it for now.

Reviewed-by: Kees Cook <keescook@chromium.org>

-- 
Kees Cook

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2023-11-16 21:05 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-11-16 20:57 [PATCH][next] wifi: mt76: mt7996: Use DECLARE_FLEX_ARRAY() and fix -Warray-bounds warnings Gustavo A. R. Silva
2023-11-16 20:57 ` Gustavo A. R. Silva
2023-11-16 21:05 ` Kees Cook [this message]
2023-11-16 21:05   ` Kees Cook
2023-12-02 21:27 ` Kees Cook
2023-12-02 21:27   ` Kees Cook
2023-12-04  8:37   ` Kalle Valo
2023-12-04  8:37     ` Kalle Valo
2023-12-12 15:09 ` Kalle Valo
2023-12-12 15:09   ` Kalle Valo

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