linux-kernel - Re: ThinkPad T480s & LED_MUTE, LED

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Message-ID: <20180616155844.GA19005@amd>
Date:   Sat, 16 Jun 2018 17:58:44 +0200
From:   Pavel Machek <pavel@....cz>
To:     Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:     Pali Rohár <pali.rohar@...il.com>,
        Henrique de Moraes Holschuh <ibm-acpi@....eng.br>,
        ibm-acpi-devel@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: ThinkPad T480s & LED_MUTE, LED_MICMUTE

Hi!

> > Question is if we want flexibility or security.
> 
> For thinkpad-acpi, it is security by default.  Flexibility is allowed as
> *compile*-time (Kconfig) option, and only as long as it defaults to
> secure *and* the help text is very explicit at instructing distros to
> NOT enable this option.

Yep, no problem with that.

> That said, if mic-mute is under HDA mixer control, it will only be
> "secure" if ALSA is also blocking userspace access to the relevant bits,
> and if that is not possible to do properly, might as well go for
> flexibility.  But only in that case.

That also makes sense.

> That would be why I use phisical shutters on embedded webcams unless the
> hardware actually airgaps them from the USB bus when the privacy switch
> is active.

And yes, I use them, too.
									Pavel

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

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