I was altering permissions to log files and accidentally gave 777 to root. Doah. Could be worse I guess. And I caught it immediately and canceled the command's execution.
Except the accident brought to mind that I run in root a lot. I use both Macintosh and Linux. Mac has a repair permissions utility. What about Linux? I there a utility to restore Linux (and in my case Fedora) to baseline user, group, and permissions to ensure the system will boot?
UPDATE: Been a few weeks now and no new problems found. I'm going to accept that this is solved.