I'm curious why you think this is a bug.  Consider:

...	   text	       |	data	    ...
...---------------|----|----------------|---...       
...    page N     |      page N+1	|   ...

Note that the beginning of the data segment overlaps onto the same
page as the end of the text segment.  If I change the rounding as you
suggest, then this piece of the data segment would be read-only, which
would obviously be wrong, and could cause panics.