linux-hardening - Re: [PATCH] uapi: stddef.h: Provide UAPI macros for __counted_by

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Date: Tue, 7 May 2024 14:58:15 +0200
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: Erick Archer <erick.archer@...look.com>
CC: Kees Cook <keescook@...omium.org>, Alexey Dobriyan <adobriyan@...il.com>,
	Miguel Ojeda <ojeda@...nel.org>, Nathan Chancellor <nathan@...nel.org>,
	Dmitry Antipov <dmantipov@...dex.ru>, "Gustavo A. R. Silva"
	<gustavoars@...nel.org>, Justin Stitt <justinstitt@...gle.com>,
	<linux-kernel@...r.kernel.org>, <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH] uapi: stddef.h: Provide UAPI macros for __counted_by_{le,
 be}

From: Erick Archer <erick.archer@...look.com>
Date: Mon,  6 May 2024 19:42:08 +0200

> Provide UAPI macros for UAPI structs that will gain annotations for
> __counted_by_{le, be} attributes.

Pls add me to Cc next time.

Why is this change needed? __counted_by_{le, be}() aren't used anywhere
in the uAPI headers.

> 
> Signed-off-by: Erick Archer <erick.archer@...look.com>
> ---
>  include/uapi/linux/stddef.h | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/include/uapi/linux/stddef.h b/include/uapi/linux/stddef.h
> index 2ec6f35cda32..58154117d9b0 100644
> --- a/include/uapi/linux/stddef.h
> +++ b/include/uapi/linux/stddef.h
> @@ -55,4 +55,12 @@
>  #define __counted_by(m)
>  #endif
>  
> +#ifndef __counted_by_le
> +#define __counted_by_le(m)
> +#endif
> +
> +#ifndef __counted_by_be
> +#define __counted_by_be(m)
> +#endif
> +
>  #endif /* _UAPI_LINUX_STDDEF_H */

Thanks,
Olek