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To keep the exploit dormant until later, I initially explored self-modifying code (see https://ephemeral.cx/2013/12/writing-a-self-mutating-x86_64-c-program/ for a basic example). This approach had several drawbacks. First, it would cause the binary seen in the debugger to differ from the runtime version. While the core dump could technically capture this, I wanted to keep things as realistic as possible. Second, it would require making program memory writable via a system call (see https://github.com/axlan/fatal_core_dump/blob/v0.1.2/minimal_example/vuln_test3.py). At that point, I realized there was a more fundamental problem.
fn find_or_fail(arr: [int], target: int) - Result<int {