!!Con 2021 - wintln!(): teaching an ELF to uwu!! by Jade Fink
0wintln!(): teaching an ELF to uwu!! by Jade Fink
Linux programs can print output in uwu-speak, but they either need to have their output filtered after the fact, or need to use special functions to output such text. This is clearly unacceptable! I should be able to include an uwuifier library so all my program’s output is uwuified, nyowo mattew whewe it came fwowom!!
I will show the learning process from idea to minimal prototype of a text uwuifier that, with one function call, inserts itself into its process using tricks from binary exploitation for ironically benign purposes. I figure out how the dynamic linker resolves function calls to the system C library and redirect them for my own nefarious purposes by fooling around with a debugger!
Jade is a Computer Engineering student at the University of British Columbia in Vancouver. While she’s not hacking on tooling (primarily Rust), operating systems, or making jokes on Twitter, she likes to bake and go on long bike rides around the city.