linux-hardening - Re: [PATCH v2 13/18] sysctl: move sysctl type to ctl_table

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Date: Tue, 5 Dec 2023 23:41:32 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Luis Chamberlain <mcgrof@...nel.org>
Cc: Kees Cook <keescook@...omium.org>, 
	"Gustavo A. R. Silva" <gustavoars@...nel.org>, Iurii Zaikin <yzaikin@...gle.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Joel Granados <j.granados@...sung.com>, 
	linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2 13/18] sysctl: move sysctl type to ctl_table_header

On 2023-12-05 14:33:38-0800, Luis Chamberlain wrote:
> On Mon, Dec 04, 2023 at 08:52:26AM +0100, Thomas Weißschuh wrote:
> > @@ -231,7 +231,8 @@ 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_header(header)) {
> > +	if (header->ctl_table == sysctl_mount_point ||
> > +	    sysctl_is_perm_empty_ctl_header(header)) {
> >  		if (!RB_EMPTY_ROOT(&dir->root))
> >  			return -EINVAL;
> >  		sysctl_set_perm_empty_ctl_header(dir_h);
> 
> While you're at it.

This hunk is completely gone in v3/the code that you merged.

> This just made me cringe, and curious if some other changes
> could be done to make this obviously clear during patch review
> that this is safe.

Which kind of unsafety do you envision here?