linux-kernel - Re: [PATCH v8 08/12] fs/sysfs/dir.c: replace S_IRWXU|S_IRUGO|S_IXUGO with 0755 sysfs_create_dir

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Date:   Tue, 5 Oct 2021 09:05:41 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     tj@...nel.org, gregkh@...uxfoundation.org,
        akpm@...ux-foundation.org, minchan@...nel.org, jeyu@...nel.org,
        shuah@...nel.org, bvanassche@....org, dan.j.williams@...el.com,
        joe@...ches.com, tglx@...utronix.de, rostedt@...dmis.org,
        linux-spdx@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 08/12] fs/sysfs/dir.c: replace S_IRWXU|S_IRUGO|S_IXUGO
 with 0755 sysfs_create_dir_ns()

On Mon, Sep 27, 2021 at 09:38:01AM -0700, Luis Chamberlain wrote:
> If one ends up expanding on this line checkpatch will complain that the
> combination S_IRWXU|S_IRUGO|S_IXUGO should just be replaced with the
> octal 0755. Do that.
> 
> This makes no functional changes.
> 
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>

It could be helpful to add a link too:
https://www.kernel.org/doc/html/latest/dev-tools/checkpatch.html?highlight=non_octal#permissions

Reviewed-by: Kees Cook <keescook@...omium.org>

> ---
>  fs/sysfs/dir.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
> index 59dffd5ca517..b6b6796e1616 100644
> --- a/fs/sysfs/dir.c
> +++ b/fs/sysfs/dir.c
> @@ -56,8 +56,7 @@ int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
>  
>  	kobject_get_ownership(kobj, &uid, &gid);
>  
> -	kn = kernfs_create_dir_ns(parent, kobject_name(kobj),
> -				  S_IRWXU | S_IRUGO | S_IXUGO, uid, gid,
> +	kn = kernfs_create_dir_ns(parent, kobject_name(kobj), 0755, uid, gid,
>  				  kobj, ns);
>  	if (IS_ERR(kn)) {
>  		if (PTR_ERR(kn) == -EEXIST)
> -- 
> 2.30.2
> 

-- 
Kees Cook