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

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  [PATCH] platform/x86: asus-wmi: fix cpufv sysfs file permission Jérémy Lefaure          <jeremy.lefaure@lse.epita.fr> - 2017-04-22 04:30 +0200
    Re: [PATCH] platform/x86: asus-wmi: fix cpufv sysfs file permission Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-04-24 11:20 +0200
      Re: [PATCH] platform/x86: asus-wmi: fix cpufv sysfs file permission Jérémy Lefaure <jeremy.lefaure@lse.epita.fr> - 2017-04-24 17:40 +0200

#1628739 — [PATCH] platform/x86: asus-wmi: fix cpufv sysfs file permission

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.

Signed-off-by: Jérémy Lefaure <jeremy.lefaure@lse.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

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#1629340

On Sat, Apr 22, 2017 at 5:19 AM, Jérémy Lefaure
<jeremy.lefaure@lse.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@lse.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

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#1629682

On Mon, 24 Apr 2017 12:14:14 +0300
Andy Shevchenko <andy.shevchenko@gmail.com> wrote:

> On Sat, Apr 22, 2017 at 5:19 AM, Jérémy Lefaure
> <jeremy.lefaure@lse.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?
> 
It depends if we want to keep it write-only as it is documented in
Documentation/ABI/testing/sysfs-platform-asus-wmi.

If we want to have this file read/write, I can send a v2 of this patch.

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