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Back when Intel introduced the 80286, they didn't quite document everything right away. Errata were needed. Then the 80386 changed things. And then someone convinced them to add just one more feature at the last minute, which didn't get documented properly again.
The History of a Security Hole takes a look at the problems introduced by the I/O Permission Bitmap (IOPB) in the 80286, and how fallout from the implementation caused a security hole in all versions of OpenBSD up to 6.3 and NetBSD up to 4.4.
Conclusion? This programming thing is hard.
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Grelb's Reminder:
Eighty percent of all people consider themselves to be above
average drivers.
(Score: 2) by DannyB on Friday September 07 2018, @07:30PM
You're right that you said most things.
About microprocessors. If there is a development cost of x, which is 20% total cost for 80% correctness, and then 4x which is 80% of cost for remaining 20% correctness, then that 4x element is spread across billions of processors.
The lower I set my standards the more accomplishments I have.