linux-kernel - Re: [PATCH 2/2] LoadPin: Make sysctl table const

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Message-ID: <202502101638.BE56669918@keescook>
Date: Mon, 10 Feb 2025 16:38:32 -0800
From: Kees Cook <kees@...nel.org>
To: "Ricardo B. Marliere" <ricardo@...liere.net>
Cc: Paul Moore <paul@...l-moore.com>, James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Ricardo B. Marliere" <rbm@...e.com>,
	Thomas Weißschuh <linux@...ssschuh.net>
Subject: Re: [PATCH 2/2] LoadPin: Make sysctl table const

On Thu, Jan 23, 2025 at 04:33:35PM -0300, Ricardo B. Marliere wrote:
> Since commit 7abc9b53bd51 ("sysctl: allow registration of const struct
> ctl_table"), the sysctl registration API allows for struct ctl_table to be
> in read-only memory. Move loadpin_sysctl_table to be declared at build
> time, instead of having to be dynamically allocated at boot time.
> 
> Cc: Thomas Weißschuh <linux@...ssschuh.net>
> Suggested-by: Thomas Weißschuh <linux@...ssschuh.net>
> Signed-off-by: Ricardo B. Marliere <rbm@...e.com>
> ---
>  security/loadpin/loadpin.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/security/loadpin/loadpin.c b/security/loadpin/loadpin.c
> index 68252452b66cb913638abbca2adea26219e77d37..e2d664b7602629c08c86d6d02158a4e9dd189b1a 100644
> --- a/security/loadpin/loadpin.c
> +++ b/security/loadpin/loadpin.c
> @@ -53,7 +53,7 @@ static bool deny_reading_verity_digests;
>  #endif
>  
>  #ifdef CONFIG_SYSCTL
> -static struct ctl_table loadpin_sysctl_table[] = {
> +static const struct ctl_table loadpin_sysctl_table[] = {
>  	{
>  		.procname       = "enforce",
>  		.data           = &enforce,

This can't be done since the table is modified during set_sysctl().

-Kees

-- 
Kees Cook