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Computer Systems Bomblab Phase 3 Walkthrough

In this video, I demonstrate how to solve the Bomblab Phase 3 for Computer Systems. I assume that the student has already set up a VPN connection to a linux system running on an Intel x86_64 computer architecture authorized to run their bomb for this lab. 1. Log into your linux machine using your preferred ssh software and navigate to where your bomb is. 2. For phase 3, it is useful to chunk portions of assembly code into logical chunks, and then determine how our input interacts with those chunks. 3. Determine what the difference is between cmp and test and what the effect of this will be on a specific jump instruction. 4. Try out a guess for phase_3 with more than 1 argument using gdb. Don't worry, it won't be correct--but it will help you walk through the code execution and see into memory. 5. I demonstrate load effective address and movsql, which are the peak of this function. You must be able to see into memory to understand what movsql is doing--you cannot see this just by reading the code. 6. Use the knowledge regarding lea and movsql to help you figure out which instruction will be jumped to next. This next line provides a hint to the second number of your input. 7. Restart the bomb using "run" again. Try steps 3-6 with a better guess as to what your input should be. Good luck!