Plus, manually test as needed (for /proc/pid/mem, should take less than an hour to write a program to test it still works).
A competent programmer working an entire day should be able to fix pretty much any bug; if not, the feature is most likely totally broken and can thus be disabled in that time.
I strongly doubt Linus Torvalds needed more than a day to fix the /proc/pid/mem issue for instance.
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