Date: Tue, 8 Dec 2015 00:04:26 +1100 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: Lu?s Fernando Schultz Xavier da Silveira <schultz@ime.usp.br> Cc: freebsd-questions@freebsd.org Subject: Re: OSS in jail Message-ID: <20151207234938.F52001@sola.nimnet.asn.au> In-Reply-To: <mailman.89.1449489602.81642.freebsd-questions@freebsd.org> References: <mailman.89.1449489602.81642.freebsd-questions@freebsd.org>
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In freebsd-questions Digest, Vol 601, Issue 1, Message: 4 On Sun, 6 Dec 2015 17:44:01 -0200 Lu?s Fernando Schultz Xavier da Silveira <schultz@ime.usp.br> wrote: > 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? > If not, is it possible to create a virtual OSS stack and give that to > the jail? > How would you solve this problem? > > Also, is it possible to give the jail a mixer device that can only read > mixer settings but not alter them? > > Thanks, > Lu?s Sorry about charset mapping .. I suggest asking this (interesting) question in either or both of freebsd-jail@freebsd.org and freebsd-multimedia@freebsd.org . I'm vaguely wondering if you could use port audio/jack for this, but I've only used that on Linux, and that with ALSA .. but I expect you should find some help from the habitual denizens of those lists. cheers, Ian
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