linux-hardening - Re: [PATCH] wifi: ath10k: Annotate struct ath10k_ce_ring with __counted

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Date:   Fri, 15 Sep 2023 15:19:34 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>, Kalle Valo <kvalo@...nel.org>
Cc:     Jeff Johnson <quic_jjohnson@...cinc.com>,
        ath10k@...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: ath10k: Annotate struct ath10k_ce_ring 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 ath10k_ce_ring.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Kalle Valo <kvalo@...nel.org>
> Cc: Jeff Johnson <quic_jjohnson@...cinc.com>
> Cc: ath10k@...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/ath10k/ce.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/ath/ath10k/ce.h b/drivers/net/wireless/ath/ath10k/ce.h
> index 666ce384a1d8..27367bd64e95 100644
> --- a/drivers/net/wireless/ath/ath10k/ce.h
> +++ b/drivers/net/wireless/ath/ath10k/ce.h
> @@ -110,7 +110,7 @@ struct ath10k_ce_ring {
>   	struct ce_desc_64 *shadow_base;
>   
>   	/* keep last */
> -	void *per_transfer_context[];
> +	void *per_transfer_context[] __counted_by(nentries);
>   };
>   
>   struct ath10k_ce_pipe {