[Fwd: [Poll] Changing permissions on raw1394]

[Pietro Bergamo]

Hi, Andrew.
  I don't know if it would be the case to deal with what I'm going to write about in this app your are developing. If it isn't, please just ignore this post. My trouble is to set jack to accept the 4 outs my Audigy soundcard has as independent channels. I've been trying to do so since I first started using Linux with Demudi about 2 years ago with no luck. Alsa recongnizes and adresses them correctly (with speaker test and alsa mixer), but I can't make it with jack nor with pd. I found some changes to be done at the .asoundrc file at the Alsa unofficial wiki, but that didn't work either. I've been doing the best I can, but being a musician and not a computer programmer, it's been quite a tough time trying to unveil all these magic spells to configure things by hand. I'd really apreciate it if this could be done in a more intuitive way. Or maybe I just should start saving money for another soundcard. :^)
  Thanks anyway.
  Best regards,
  Pietro

Andrew Hunter <andrew at aehunter.net> escreveu:
  I seem to have sent this message only to the -devel list, so here it is. :)

-------- Original Message --------
Subject: [Poll] Changing permissions on raw1394
Date: Thu, 29 Nov 2007 12:13:40 +0000
From: Andrew Hunter 
Reply-To: Ubuntu Studio Users Help and Discussion 

To: Ubuntu Studio Users Help and Discussion 
, Ubuntu Studio Development & 
Technical Discussion 

Hey everyone!

If you have not heard about it already, the Ubuntu Studio team is
looking at creating an app that would easily allow users to change
common settings that they may be currently editing by hand.[1]

One of the features that we are considering is changing the permissions
on raw1394 /etc/udev/rules.d/40-permissions.rules from disk to audio or
video. This is a necessary change currently to enable firewire based
devices to work as a regular user, such as firewire sound cards and
video cameras.

The other alternative solution is to add the user to group "disk",
though this may also cause problems.

The issue with this is that it creates a rather large security risk for
the system, in that any device on the firewire bus can run with root
privileges. This risk is less of an issue for stand-alone machines that
do not use Ethernet over firewire, but is still something to consider.

I would like to stress that it _will not_ be changed by default. All
that we are considering is providing a more accessible way to modify
those settings.

In the future, when Ubuntu and by extension Ubuntu Studio move to the
new firewire stack in the kernel, this issue will be an non-issue. The
new kernel stack provides much finer granularity and control over
permissions on specific devices.

The question then I am posing to you guys is this: How many of you
already change this setting by hand?


Thanks,

Andrew

[1]
https://lists.ubuntu.com/archives/ubuntu-studio-devel/2007-November/000095.html

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