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OP here. About half are off the shelf. Joint functions, the breakpoint infinite loop, in-house memmove, the overflowing thing, those I haven’t read about anywhere before.

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For the overflow, Jagex with RuneScape did it in Java. They also did stupid Object arrays 7 or so levels deep, doing casts on casts in between. The bytecode itself made the actual runtime slow to a crawl (anywhere from 5 to 10x slowdown.) This was circa 2014.

That’s interesting to know

> the breakpoint infinite loop

This is a fairly standard debugging technique.

> in-house memmove

You sure they didn't just statically link a libc?

> the breakpoint infinite loop

Have seen multiple times in CTFs

Usually the good CTFs don't stoop to stupid tricks like these, to be fair.

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