linux-kernel - Re: [PATCH 1/2] yama: Make sysctl table const

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Message-ID: <202502101636.C8D3F04@keescook>
Date: Mon, 10 Feb 2025 16:37:20 -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 1/2] yama: Make sysctl table const

On Thu, Jan 23, 2025 at 04:33:34PM -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 yama_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/yama/yama_lsm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c
> index e1a5e13ea269d4917fe2c78cb79f1d44881653c2..54bd5f535ac1fef9409ea96ad60825f565318daf 100644
> --- a/security/yama/yama_lsm.c
> +++ b/security/yama/yama_lsm.c
> @@ -454,7 +454,7 @@ static int yama_dointvec_minmax(const struct ctl_table *table, int write,
>  
>  static int max_scope = YAMA_SCOPE_NO_ATTACH;
>  
> -static struct ctl_table yama_sysctl_table[] = {
> +static const struct ctl_table yama_sysctl_table[] = {

This was done via commit 1751f872cc97 ("treewide: const qualify
ctl_tables where applicable").

-- 
Kees Cook