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

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Message-ID: <20160915133558.GA29883@amd>
Date:   Thu, 15 Sep 2016 15:35:58 +0200
From:   Pavel Machek <pavel@....cz>
To:     Jacek Anaszewski <j.anaszewski@...sung.com>
Cc:     David Lechner <david@...hnology.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

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.

And actually... is it possible to have more then one userspace LED
with this interface? I do have RGB LED connect on /dev/ttyUSB0, and I
guess userspace driver would be appropriate, but it needs 3
channels...

Best regards,
								Pavel

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