linux-kernel - Re: [PATCH] platform/x86: asus-wmi: fix cpufv sysfs file permission

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Date:   Mon, 24 Apr 2017 12:14:14 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Jérémy Lefaure <jeremy.lefaure@....epita.fr>
Cc:     Corentin Chary <corentin.chary@...il.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        acpi4asus-user <acpi4asus-user@...ts.sourceforge.net>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] platform/x86: asus-wmi: fix cpufv sysfs file permission

On Sat, Apr 22, 2017 at 5:19 AM, Jérémy Lefaure
<jeremy.lefaure@....epita.fr> wrote:
> The cpufv sysfs file is defined as readable by anyone even if the
> attribute does not have a show function. The result of every read is an
> IO error. This file should be write only.

Per se patch looks good to me, though would be better to add show()
hook as well?

>
> Signed-off-by: Jérémy Lefaure <jeremy.lefaure@....epita.fr>
> ---
>  drivers/platform/x86/asus-wmi.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index 8499d3ae4257..0ace471cb700 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -1761,7 +1761,7 @@ ASUS_WMI_CREATE_DEVICE_ATTR(cardr, 0644, ASUS_WMI_DEVID_CARDREADER);
>  ASUS_WMI_CREATE_DEVICE_ATTR(lid_resume, 0644, ASUS_WMI_DEVID_LID_RESUME);
>  ASUS_WMI_CREATE_DEVICE_ATTR(als_enable, 0644, ASUS_WMI_DEVID_ALS_ENABLE);
>
> -static ssize_t store_cpufv(struct device *dev, struct device_attribute *attr,
> +static ssize_t cpufv_store(struct device *dev, struct device_attribute *attr,
>                            const char *buf, size_t count)
>  {
>         int value, rv;
> @@ -1778,7 +1778,7 @@ static ssize_t store_cpufv(struct device *dev, struct device_attribute *attr,
>         return count;
>  }
>
> -static DEVICE_ATTR(cpufv, S_IRUGO | S_IWUSR, NULL, store_cpufv);
> +static DEVICE_ATTR_WO(cpufv);
>
>  static struct attribute *platform_attributes[] = {
>         &dev_attr_cpufv.attr,
> --
> 2.12.2
>



-- 
With Best Regards,
Andy Shevchenko