linux-kernel - Re: [PATCH 2/2] gpiolib: cdev: export the consumer's PID

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Message-ID: <YxtEFNdgzmpbN94s@smile.fi.intel.com>
Date:   Fri, 9 Sep 2022 16:48:04 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>,
        Kees Cook <keescook@...omium.org>
Cc:     Kent Gibson <warthog618@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] gpiolib: cdev: export the consumer's PID

+Cc: Kees

On Fri, Sep 09, 2022 at 02:13:29PM +0200, Bartosz Golaszewski wrote:
> It's useful for user-space to be able to know the PIDs of processes
> holding GPIO lines in case they have the permissions and need to kill
> them.
> 
> Extend the gpio_v2_line_info structure with the consumer_pid field
> that's set to the PID of the user-space process or 0 if the user lives
> in the kernel.

I'm wondering if there is any security implications and this PID
can be abused.

-- 
With Best Regards,
Andy Shevchenko