On Wed, 2003-05-28 at 23:49, Richard Hector wrote: > On Wed, May 28, 2003 at 08:47:30PM -0400, Mark L. Kahnt wrote: > > On Wed, 2003-05-28 at 20:18, Jonathon B. Craw wrote: > > > > > > 1. Permissions on /dev/mix* /dev/dsp/*: give yourself read/write access > > > I might do something like chmod a+rw /dev/mix* /dev/dsp* -- see chmod > > > > > Umm, no... > > > > Also known as "NO! NO! NO!" > > > > Do NOT go mucking around with chmod'ing /dev entries! They are the way > > they are for a reason. > > > > Instead, do an ls -l of the /dev entries that you need - in this case > > you are looking at sound so you will likely see something like: > > > > crw-rw---- 1 root audio 14, 3 1969-12-31 19:00 /dev/sound/dsp > > While that's true of audio stuff, can you still recommend the same approach > (leave it alone) for other devices? IIRC I had to "chgrp scanner /dev/sg0" > to give myself permission to use my scanner - the alternative is to add > myself to the root group, which is a bit loose ... > > Is there a reason I shouldn't have done what I did? > > Thanks, > > Richard Essentially, it is a potential security hole to just go and add additional permissions to a device, particularly write permissions, but as well, if you use devfs, my understanding is that such settings don't carry from one launching of devfs to the next. While sound is not as large of a risk, it is this practice that would lead to someone deciding "Well, I have this FAT32 or NTFS partition I want to be able to write to as a user - I'll just make the device world writeable" and the next thing you know, the filesystem on the device gets trashed by some decision to write to the device itself. -- Mark L. Kahnt, FLMI/M, ALHC, HIA, AIAA, ACS, MHP ML Kahnt New Markets Consulting Tel: (613) 531-8684 / (613) 539-0935 Email: kahnt@hosehead.dyndns.org
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