maxcai314

/*
 * This challenge was published for VuwCTF 2025.
 * Challenge Name: blazingly-fast-memory-unsafe
 * User Brief: Is this modern, blazingly fast, memory-unsafe JIT-compiled language the future of programming?
 * Event Organizers: https://vuwctf.com/
 * Author: maxster (Max Cai)
 * 
 * This source code file, along with the compiled binary, was provided to players.
 * Players were expected to pwn a remote instance running the same program,
 * which contained the flag in the filesystem.

maxcai314

/*
 * This challenge was published for VuwCTF 2025.
 * Event Organizers: https://vuwctf.com/
 * Author: maxster (Max Cai)
 * 
 * This file, along with the binary ELF patched to
 * use the specific libc.so.6 and ld-linux-x86-64.so.2,
 * was provided to participants during the competition.
 * Players were provided access to a server hosting this
 * program, which contained the flag in the filesystem.

maxcai314

=LET(
    BEGIN_LIB_OOP, "smalltalk-style message handler framework",
    message_match, LAMBDA(expected, LAMBDA(actual,
        IFERROR((actual = expected), FALSE)
    )),
    is_nil, LAMBDA(obj, IFERROR(obj("is_nil__"), FALSE)),

    as_err_string, LAMBDA(message, fallback_message,
        IFERROR(
            CONCAT("", message),

maxcai314

=LET(
    BEGIN_LIB_BOOL, "standard boolean library",
    identity_l, LAMBDA(x, x),
    true_l, LAMBDA(a, LAMBDA(b, a)), 
    false_l, LAMBDA(a, LAMBDA(b, b)), 
    not_l, LAMBDA(a, a(false_l)(true_l)),
    and_l, LAMBDA(a, LAMBDA(b, a(b)(false_l))), 
    bool_to_literal, LAMBDA(b, b(TRUE)(FALSE)),
    literal_to_bool, LAMBDA(a, IF(a, true_l, false_l)),

maxcai314

public class Quine {
    public static void main(String[] args) {
        // todo: make it print all the other stuff such as the psvm signature, etc.
        String s = "String s = %s;System.out.printf(s, (char) 34 + s + (char) 34, ';')%s";System.out.printf(s, (char) 34 + s + (char) 34, ';');
    }
}