Entry Info

• Date: 2025-10-19
• BGGP Challenge: 6 + 1 + 2
• Name: mauke
• Contact Info:
• Online Presence:
• Writeup Link: https://blogs.perl.org/users/mauke/2025/10/a-palindromic-polyglot-program-in-x86-machine-code-perl-shell-and-make.html

File Info

• Target File Type: com, perl, sh, make
• Target File Size: 55
• SHA256 Hash: c4900c70324269f82d9e77da43b58560e04032e92aa1e665bd4520c352021b1d

File Contents

I960ArI2zSHDIwp0cnVlIDo7cHJpbnRmIDYgIyA2IGZ0bmlycDs6IGV1cnQKI8MhzTayArTeIw==

Environment Info

Target Software and Version

Environment Setup

Name the file bggp6.com. It should be directly runnable in DOS. On Linux, try dosbox bggp6.com.

It runs as Perl: perl bggp6.com

It runs as shell script: sh bggp6.com

It runs as a Makefile: make -sf bggp6.com

Note that no final newline is printed, so you may want to run perl bggp6.com; echo, etc. for nicer output.

Additional Info

It's a palindrome polyglot and outputs "6".