linux-kernel - Re: [PATCH v1 1/1] gpiolib: sysfs: Do unexport GPIO when user asks for it

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, 16 Aug 2023 13:36:45 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andy@...nel.org>,
        Marek Behún <kabel@...nel.org>
Subject: Re: [PATCH v1 1/1] gpiolib: sysfs: Do unexport GPIO when user asks
 for it

On Mon, Aug 14, 2023 at 6:29 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>
> On Mon, Aug 14, 2023 at 7:13 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> > On Mon, Aug 14, 2023 at 1:19 PM Andy Shevchenko
> > <andriy.shevchenko@...ux.intel.com> wrote:
> > >
> > > It seems that sysfs interface implicitly relied on the gpiod_free()
> > > to unexport the line. This is not good and prone to regressions.
> > > Fix it by explicitly calling gpiod_unexport().
> > >
> >
> > I wouldn't say it's prone to regressions, it's literally just that
> > gpiod_free() should not deal with sysfs.
> >
> > How about that for commit message (I can change it when applying):
> >
> > It seems that sysfs interface implicitly relied on the gpiod_free()
> > to unexport the line. This is logically incorrect as core gpiolib should
> > not deal with sysfs so instead of restoring it, let's call gpiod_unexport()
> > from sysfs code.
>
> I'm fine with it, go ahead and apply with the change. Thank you!
>
> --
> With Best Regards,
> Andy Shevchenko

Queued for fixes.

Bart