linux-kernel - Re: [PATCH v3] leds: Introduce userspace leds driver

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Date:   Fri, 16 Sep 2016 07:51:23 +0200
From:   Pavel Machek <pavel@....cz>
To:     David Lechner <david@...hnology.com>
Cc:     Jacek Anaszewski <j.anaszewski@...sung.com>,
        Richard Purdie <rpurdie@...ys.net>,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        Marcel Holtmann <marcel@...tmann.org>
Subject: Re: [PATCH v3] leds: Introduce userspace leds driver

On Thu 2016-09-15 10:31:50, David Lechner wrote:
> On 09/15/2016 09:54 AM, Jacek Anaszewski wrote:
> >Hi Pavel,
> >
> >On 09/15/2016 03:08 PM, Pavel Machek wrote:
> >>Hi!
> >>
> >>>>+    if (copy_from_user(&udev->user_dev, buffer,
> >>>>+               sizeof(struct uleds_user_dev))) {
> >>>>+        ret = -EFAULT;
> >>>>+        goto out;
> >>>>+    }
> >>>>+
> >>>>+    if (!udev->user_dev.name[0]) {
> >>>>+        ret = -EINVAL;
> >>>>+        goto out;
> >>>>+    }
> >>>>+
> >>>>+    ret = led_classdev_register(NULL, &udev->led_cdev);
> >>>>+    if (ret < 0)
> >>>>+        goto out;
> >>
> >>No sanity checking on the name -> probably a security hole. Do not
> >>push this upstream before this is fixed.
> >
> >Thanks for catching this.
> >
> >David, please check if the LED name sticks to the LED class
> >device naming convention.
> 
> I don't think it is a good idea to enforce the LED class naming convention.
> Someone may have a userspace application they want to test that has a
> hard-coded name that does not follow the convention.

Umm.

Noone has applications with hardcoded names that are not possible
today, right?

And better not encourage crazy names.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html