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Decide for yourself, of course, but it looks safe to me - there's only one 
buffer and fgets doesn't let it overflow, there's only one file opening, and 
while there is a potential race condition there, it's with /dev/console.  If 
someone can exploit this race by replacing /dev/console, you've got bigger 
problems.  :)

So the quick solution is beep is not beeping when you want it to is:

$ su
Password:
# chmod 4755 /usr/bin/beep

(or wherever you put it)

The one snag is that this will give any little nitwit the ability to run beep 
successfully - make sure this is what you want.  If it isn't, a slightly more 
complex fix would be something like:

# chgrp beep /usr/bin/beep
# chmod 4750 /usr/bin/beep

and then add only beep-worthy users to the 'beep' group.

Playing Songs
-------------

A surprising number of people have sent in requests, or even patches, to help
beep play multiple, different sounds off a single invocation.  I had always
thought that if people wanted a more complex melody, they would just do 
something like: