linux-kernel - Re: [PATCH] sctp: annotate struct sctp_assoc_ids with __counted

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Date: Sat, 1 Jun 2024 16:02:25 +0200
From: Erick Archer <erick.archer@...look.com>
To: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
	Xin Long <lucien.xin@...il.com>, Kees Cook <keescook@...omium.org>,
	"Gustavo A. R.  Silva" <gustavoars@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>
Cc: Erick Archer <erick.archer@...look.com>, linux-sctp@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: Re: [PATCH] sctp: annotate struct sctp_assoc_ids with __counted_by()

Hi,

On Wed, May 01, 2024 at 07:01:22PM +0200, Erick Archer 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).
> 
> Suggested-by: Kees Cook <keescook@...omium.org>
> Signed-off-by: Erick Archer <erick.archer@...look.com>
> ---
>  include/uapi/linux/sctp.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h
> index b7d91d4cf0db..836173e73401 100644
> --- a/include/uapi/linux/sctp.h
> +++ b/include/uapi/linux/sctp.h
> @@ -1007,7 +1007,7 @@ enum sctp_sstat_state {
>   */
>  struct sctp_assoc_ids {
>  	__u32		gaids_number_of_ids;
> -	sctp_assoc_t	gaids_assoc_id[];
> +	sctp_assoc_t	gaids_assoc_id[] __counted_by(gaids_number_of_ids);
>  };
>  
>  /*

Friendly ping: who can take this, please?

Regards,
Erick