[Wlug] /dev permissions & ownership

I just discovered that something has caused many device files (many of them audio) have ended up with the wrong ownership/permission. (My daughter's account had ownership.) I fixed some, but I have no idea what's the right permissions. Is there some way I can check the permissions? Ideally, there would be a script that would report which device files are not set to the default. (I've changed some, like the cdrom and floppy, intentionally.) TIA, Bill