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Date:      Sun, 6 Dec 2015 21:45:12 +0200
From:      Anton Sayetsky <vsasjason@gmail.com>
To:        =?UTF-8?Q?Lu=C3=ADs_Fernando_Schultz_Xavier_da_Silveira?= <schultz@ime.usp.br>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: OSS in jail
Message-ID:  <CAA2O=b_isQOHepigMgDyDGtOidpbYkLOmvEayCbETfLEbUsDKA@mail.gmail.com>
In-Reply-To: <20151206194401.GA3860@hpmini>
References:  <20151206194401.GA3860@hpmini>

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2015-12-06 21:44 GMT+02:00 Lu=C3=ADs Fernando Schultz Xavier da Silveira
<schultz@ime.usp.br>:
> Hi,
>
> I would like one of my jails to have the ability to play back sound,
> but not to record it. As I understand, sound is played back by writing
> to /dev/dsp and recorded by reading from it. Hence, placing the /dev/dsp
> device (and /dev/dsp[0-9]* devices) in the jail via devfs.rules is not
> a solution since the jail superuser can override permissions on these
> devices and even read from them when they lack read permission.
>
> Is there a way to give a device to a jail in read-only mode?
How do you want to write sound output to read-only device?



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