timbray, 
It dawns on me that many of you youngster developers out there probably don’t know about the Ken Thompson hack. If you’re one of them, reading this should make you shudder:
https://wiki.c2.com/?TheKenThompsonHack
https://www.cs.cmu.edu/~rdriley/487/papers/Thompson_1984_ReflectionsonTrustingTrust.pdf
