linux-hardening - Re: [PATCH] wifi: wcn36xx: Annotate struct wcn36xx_hal_ind_msg with __counted

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Message-ID: <f1a4033a-e702-da0f-b16b-ff6df8e1451f@embeddedor.com>
Date:   Fri, 15 Sep 2023 14:33:42 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>,
        Loic Poulain <loic.poulain@...aro.org>
Cc:     Kalle Valo <kvalo@...nel.org>, wcn36xx@...ts.infradead.org,
        linux-wireless@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] wifi: wcn36xx: Annotate struct wcn36xx_hal_ind_msg with
 __counted_by



On 9/15/23 14:06, Kees Cook wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
> (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
> 
> As found with Coccinelle[1], add __counted_by for struct wcn36xx_hal_ind_msg.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Loic Poulain <loic.poulain@...aro.org>
> Cc: Kalle Valo <kvalo@...nel.org>
> Cc: wcn36xx@...ts.infradead.org
> Cc: linux-wireless@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks
-- 
Gustavo

> ---
>   drivers/net/wireless/ath/wcn36xx/smd.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/ath/wcn36xx/smd.h b/drivers/net/wireless/ath/wcn36xx/smd.h
> index cf15cde2a364..2c1ed9e570bf 100644
> --- a/drivers/net/wireless/ath/wcn36xx/smd.h
> +++ b/drivers/net/wireless/ath/wcn36xx/smd.h
> @@ -47,7 +47,7 @@ struct wcn36xx_fw_msg_status_rsp {
>   struct wcn36xx_hal_ind_msg {
>   	struct list_head list;
>   	size_t msg_len;
> -	u8 msg[];
> +	u8 msg[] __counted_by(msg_len);
>   };
>   
>   struct wcn36xx;