linux-hardening - Re: [PATCH] i40e: Annotate struct i40e_qvlist_info with __counted

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Message-ID: <87a74ca5-13fc-f8ec-5e54-66836532ada7@embeddedor.com>
Date: Wed, 4 Oct 2023 01:39:16 +0200
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>,
 Tony Nguyen <anthony.l.nguyen@...el.com>
Cc: Shiraz Saleem <shiraz.saleem@...el.com>, Jakub Kicinski
 <kuba@...nel.org>, Jesse Brandeburg <jesse.brandeburg@...el.com>,
 Gurucharan G <gurucharanx.g@...el.com>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 Nathan Chancellor <nathan@...nel.org>,
 Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
 llvm@...ts.linux.dev
Subject: Re: [PATCH] i40e: Annotate struct i40e_qvlist_info with __counted_by

On 10/4/23 01:18, 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 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 i40e_qvlist_info.
> 
> Cc: Tony Nguyen <anthony.l.nguyen@...el.com>
> Cc: Shiraz Saleem <shiraz.saleem@...el.com>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Jesse Brandeburg <jesse.brandeburg@...el.com>
> Cc: Gurucharan G <gurucharanx.g@...el.com>
> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
> Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
--
Gustavo

> ---
>   include/linux/net/intel/i40e_client.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/net/intel/i40e_client.h b/include/linux/net/intel/i40e_client.h
> index ed42bd5f639f..0aa4411528fc 100644
> --- a/include/linux/net/intel/i40e_client.h
> +++ b/include/linux/net/intel/i40e_client.h
> @@ -45,7 +45,7 @@ struct i40e_qv_info {
>   
>   struct i40e_qvlist_info {
>   	u32 num_vectors;
> -	struct i40e_qv_info qv_info[];
> +	struct i40e_qv_info qv_info[] __counted_by(num_vectors);
>   };
>   
>