On Wed, 27 Sep 2017 21:43:48 -0500

> Why is this happening, and is there anything that I should do to
> correct
> 

The system has been getting more and more dynamic to make attackers
fumble in the dark.

> the "Permission denied" error?

If you prefer then add: 

/sbin/mount -uo noexec /tmp 

to /etc/rc.local

The new pledge powers that have been mentioned recently potentially make
noexec more useful ;)

I am moving all potentially problematic fstab changes such as ro
to /etc/rc.local (/sbin/mount -urf /), letting the devs use the system
during boot as they would their own system.

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