linux-kernel - Re: [PATCH v2 1/2] pinctrl: use to octal permissions for debugfs files

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 10 Feb 2021 12:18:55 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Drew Fustini <drew@...gleboard.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Tony Lindgren <tony@...mide.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Jason Kridner <jkridner@...gleboard.org>,
        Robert Nelson <robertcnelson@...gleboard.org>
Subject: Re: [PATCH v2 1/2] pinctrl: use to octal permissions for debugfs files

On Wed, Feb 10, 2021 at 10:30 AM Joe Perches <joe@...ches.com> wrote:
> On Tue, 2021-02-09 at 23:49 -0800, Drew Fustini wrote:

> > -     debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO,
> > +     debugfs_create_file("pinctrl-devices", 0400,
> >                           debugfs_root, NULL, &pinctrl_devices_fops);
>
> NAK.  You've changed the permission levels.

NAK is usually given when the whole idea is broken. Here is not the
case and you may have helped to amend the patch.

...

> And you have to keep the S_IFREG or'd along with the octal.

Perhaps time to read the code?
https://elixir.bootlin.com/linux/latest/source/fs/debugfs/inode.c#L387

...

> checkpatch does this conversion using this command line:
>
> $ ./scripts/checkpatch.pl -f --show-types --terse drivers/pinctrl/*.[ch] --types=SYMBOLIC_PERMS --fix-inplace

NAK! See above.

> -       debugfs_create_file("pins", S_IFREG | S_IRUGO,
> +       debugfs_create_file("pins", S_IFREG | 0444,
>                             device_root, pctldev, &pinctrl_pins_fops);

-- 
With Best Regards,
Andy Shevchenko