Alternatively, "must be written in Java" can be interpreted to mean "must use th...

yardstick · on Jan 4, 2024

Another rule was no external dependencies

I guess you could from Java itself write a new binary and then run that binary, but it would be against the spirit of the challenge.

sweetjuly · on Jan 4, 2024

There's sun.misc.Unsafe which is a builtin that gives you raw read/write. Turn that into ROP, mmap your native program, and now you're full native :)

nneonneo · on Jan 4, 2024

Just use JNA to allocate an RWX buffer with mmap, unpack a bit of clever code into the buffer, and forge a native function pointer to call it :)