linux-kernel - Re: [PATCH 1/2] gpiolib: don't allow userspace to set values of input lines

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Message-ID: <CAMRc=MeZX0r1khVBY72_XgyUfW=GLFG-=hUuqZHWYgCRwFkUrQ@mail.gmail.com>
Date:   Mon, 16 Jul 2018 16:13:17 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] gpiolib: don't allow userspace to set values of input lines

2018-07-16 15:40 GMT+02:00 Linus Walleij <linus.walleij@...aro.org>:
> On Mon, Jul 16, 2018 at 10:34 AM Bartosz Golaszewski <brgl@...ev.pl> wrote:
>
>> User space can currently both read and set values of input lines using
>> the character device. This was not allowed by the old sysfs interface
>> nor is it a correct behavior.
>>
>> Check the first descriptor in the set for the OUT flag when asked to
>> set values and return -EPERM if the line is input.
>>
>> Signed-off-by: Bartosz Golaszewski <brgl@...ev.pl>
>
> Patch applied! Thanks for fixing this.
>

Thanks. Do you think we should Cc stable on that one?

Bart