netdev - Re: [PATCH 2/2] net/ipv4: Annotate imsf_slist_flex with __counted_by(imsf

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Date: Fri, 9 Feb 2024 21:48:50 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>, Jakub Kicinski <kuba@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>, netdev@...r.kernel.org,
 linux-hardening@...r.kernel.org, Rasmus Villemoes
 <linux@...musvillemoes.dk>, Dan Williams <dan.j.williams@...el.com>,
 Keith Packard <keithp@...thp.com>, Miguel Ojeda <ojeda@...nel.org>,
 Alexey Dobriyan <adobriyan@...il.com>, Dmitry Antipov <dmantipov@...dex.ru>,
 Nathan Chancellor <nathan@...nel.org>, kernel test robot <lkp@...el.com>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] net/ipv4: Annotate imsf_slist_flex with
 __counted_by(imsf_numsrc)

On 2/9/24 19:16, Kees Cook wrote:
> The size of the imsf_slist_flex member is determined by imsf_numsrc, so
> annotate it as such.
> 
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Paolo Abeni <pabeni@...hat.com>
> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
> Cc: netdev@...r.kernel.org
> Cc: linux-hardening@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

LGTM:

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

Thanks!
-- 
Gustavo

> ---
>   include/uapi/linux/in.h | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/include/uapi/linux/in.h b/include/uapi/linux/in.h
> index e682ab628dfa..445f6ae76f1e 100644
> --- a/include/uapi/linux/in.h
> +++ b/include/uapi/linux/in.h
> @@ -199,7 +199,8 @@ struct ip_msfilter {
>   	__u32		imsf_numsrc;
>   	union {
>   		__be32		imsf_slist[1];
> -		__DECLARE_FLEX_ARRAY(__be32, imsf_slist_flex);
> +		__DECLARE_FLEX_ARRAY_ATTR(__be32, imsf_slist_flex,
> +					  __counted_by(imsf_numsrc));
>   	};
>   };
>