linux-hardening - Re: [PATCH] wifi: ipw2x00: Annotate struct libipw_txb with __counted

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Message-ID: <cc676b45-05d4-09a9-360e-fc908e41f809@embeddedor.com>
Date:   Fri, 15 Sep 2023 14:33:05 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>,
        Stanislav Yakovlev <stas.yakovlev@...il.com>
Cc:     Kalle Valo <kvalo@...nel.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: ipw2x00: Annotate struct libipw_txb 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 libipw_txb.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Stanislav Yakovlev <stas.yakovlev@...il.com>
> Cc: Kalle Valo <kvalo@...nel.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/intel/ipw2x00/libipw.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/intel/ipw2x00/libipw.h b/drivers/net/wireless/intel/ipw2x00/libipw.h
> index bec7bc273748..9065ca5b0208 100644
> --- a/drivers/net/wireless/intel/ipw2x00/libipw.h
> +++ b/drivers/net/wireless/intel/ipw2x00/libipw.h
> @@ -488,7 +488,7 @@ struct libipw_txb {
>   	u8 reserved;
>   	u16 frag_size;
>   	u16 payload_size;
> -	struct sk_buff *fragments[];
> +	struct sk_buff *fragments[] __counted_by(nr_frags);
>   };
>   
>   /* SWEEP TABLE ENTRIES NUMBER */