linux-kernel - Re: [PATCH] MAINTAINERS: hardening: Add __counted

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Message-ID: <20230926045721.GA3118@sol.localdomain>
Date:   Mon, 25 Sep 2023 21:57:21 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] MAINTAINERS: hardening: Add __counted_by regex

Hi Kees,

On Mon, Sep 25, 2023 at 10:20:41AM -0700, Kees Cook wrote:
> Since __counted_by annotations may also require that code be changed to
> get initialization ordering correct, let's get an extra group of eyes on
> code that is working on these annotations.
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  MAINTAINERS | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 737dcc7a2155..741285b8246e 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -11405,6 +11405,7 @@ F:	kernel/configs/hardening.config
>  F:	mm/usercopy.c
>  K:	\b(add|choose)_random_kstack_offset\b
>  K:	\b__check_(object_size|heap_object)\b
> +K:	\b__counted_by\b
>  

Are you sure you want to volunteer to maintain every file that contains
"__counted_by"?  That's what "K" does; get_maintainer.pl will list you (and
linux-hardening@...r.kernel.org) for every such file.

Other users of "K" have been surprised by this behavior.  It seems that most
people expect it to only apply to patches, not to files.  Given that you're
interested in using this functionality, have you considered updating
checkpatch.pl to handle it in the way that you probably expect that it works?

- Eric