/root permission reset on boot

[Nerius Landys]

>> I'm running FreeBSD 7.1 i386, and even after I "chmod 700 /root",
>> after a reboot it goes back to permission 755.
>> 1. What's the reason for this?  There must be a good reason and I
>> would like to know it.  Everything in FreeBSD just makes sense and is
>> well designed (honestly, no sarcasm here).
>
> It's something local to your machine; this doesn't happen on any machine
> I've used, and I can't find anything that could be configured for that.

Perhaps I was mistaken about this happening after every reboot.
Perhaps it only happens when I upgrade my world (make buildworld, make
installworld, etc.).  I do this often (every time a release patch is
released).

So, perhaps this only happens during these upgrades?