linux-hardening - Re: [PATCH v2 03/18] sysctl: drop sysctl_is_perm_empty_ctl

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Date: Thu, 7 Dec 2023 15:09:03 +0100
From: Joel Granados <j.granados@...sung.com>
To: Thomas Weißschuh <linux@...ssschuh.net>
CC: Kees Cook <keescook@...omium.org>, "Gustavo A. R. Silva"
	<gustavoars@...nel.org>, Luis Chamberlain <mcgrof@...nel.org>, Iurii Zaikin
	<yzaikin@...gle.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-hardening@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v2 03/18] sysctl: drop sysctl_is_perm_empty_ctl_table

If you are separating the work for permanently empty directories, you
can add this patch to that set. as well as  2/18

Best
On Mon, Dec 04, 2023 at 08:52:16AM +0100, Thomas Weißschuh wrote:
> It is used only once and that caller would be simpler with
> sysctl_is_perm_empty_ctl_header().
> So use this sibling function.
> 
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
>  fs/proc/proc_sysctl.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
> index 8064ea76f80b..689a30196d0c 100644
> --- a/fs/proc/proc_sysctl.c
> +++ b/fs/proc/proc_sysctl.c
> @@ -48,10 +48,8 @@ struct ctl_table_header *register_sysctl_mount_point(const char *path)
>  }
>  EXPORT_SYMBOL(register_sysctl_mount_point);
>  
> -#define sysctl_is_perm_empty_ctl_table(tptr)		\
> -	(tptr[0].type == SYSCTL_TABLE_TYPE_PERMANENTLY_EMPTY)
>  #define sysctl_is_perm_empty_ctl_header(hptr)		\
> -	(sysctl_is_perm_empty_ctl_table(hptr->ctl_table))
> +	(hptr->ctl_table[0].type == SYSCTL_TABLE_TYPE_PERMANENTLY_EMPTY)
>  #define sysctl_set_perm_empty_ctl_header(hptr)		\
>  	(hptr->ctl_table[0].type = SYSCTL_TABLE_TYPE_PERMANENTLY_EMPTY)
>  #define sysctl_clear_perm_empty_ctl_header(hptr)	\
> @@ -233,7 +231,7 @@ static int insert_header(struct ctl_dir *dir, struct ctl_table_header *header)
>  		return -EROFS;
>  
>  	/* Am I creating a permanently empty directory? */
> -	if (sysctl_is_perm_empty_ctl_table(header->ctl_table)) {
> +	if (sysctl_is_perm_empty_ctl_header(header)) {
>  		if (!RB_EMPTY_ROOT(&dir->root))
>  			return -EINVAL;
>  		sysctl_set_perm_empty_ctl_header(dir_h);
> 
> -- 
> 2.43.0
> 

-- 

Joel Granados

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