linux-kernel - Re: [PATCH] ath10k: improve structure padding

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Message-ID: <168737090122.871827.14684779188680131550.kvalo@kernel.org>
Date:   Wed, 21 Jun 2023 18:08:22 +0000 (UTC)
From:   Kalle Valo <kvalo@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Kees Cook <keescook@...omium.org>, ath10k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] ath10k: improve structure padding

Arnd Bergmann <arnd@...nel.org> wrote:

> Including an aligned structure inside of a packed one is ambiguous
> and can lead to misaligned data, as pointed out by this clang warning:
> 
> drivers/net/wireless/ath/ath10k/htt.h:715:34: error: field prefix within 'struct htt_rx_indication' is less aligned than 'struct htt_rx_indication_prefix' and is usually due to 'struct htt_rx_indication' being packed, which can lead to unaligned accesses [-Werror,-Wunaligned-access]
>         struct htt_rx_indication_prefix prefix;
>                                         ^
> drivers/net/wireless/ath/ath10k/htt.h:736:34: error: field prefix within 'struct htt_rx_indication_hl' is less aligned than 'struct htt_rx_indication_prefix' and is usually due to 'struct htt_rx_indication_hl' being packed, which can lead to unaligned accesses [-Werror,-Wunaligned-access]
>         struct htt_rx_indication_prefix prefix;
>                                         ^
> drivers/net/wireless/ath/ath10k/htt.h:1564:2: error: field  within 'struct htt_tx_fetch_ind' is less aligned than 'union htt_tx_fetch_ind::(anonymous at drivers/net/wireless/ath/ath10k/htt.h:1564:2)' and is usually due to 'struct htt_tx_fetch_ind' being packed, which can lead to unaligned accesses [-Werror,-Wunaligned-access]
>         union {
>         ^
> drivers/net/wireless/ath/ath10k/htt.h:1702:2: error: field  within 'struct htt_resp' is less aligned than 'union htt_resp::(anonymous at drivers/net/wireless/ath/ath10k/htt.h:1702:2)' and is usually due to 'struct htt_resp' being packed, which can lead to unaligned accesses [-Werror,-Wunaligned-access]
> 
> These structures appear to actually need the packing since they
> are embedded at misaligned offsets. Add even more such annotations
> here to enforce bytewise access throughout the driver.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Kalle Valo <quic_kvalo@...cinc.com>

Patch applied to ath-next branch of ath.git, thanks.

12ec37be3faf wifi: ath10k: improve structure padding

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20230616090439.2484857-1-arnd@kernel.org/

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