System Level Programming Software College of SCU Lab：Binary Bomb 1

Binary Bomb Lab 1. Lab Discription 2. Tools to "Defuse" Bombs

1. Lab Discription(1/2) Lab discription The "binary bomb" is an executable c program provided as a binary object file. Run the program, it prompts the user to type in 6 different strings. If any of these is incorrect, the bomb "explodes" by printing an error message “BOOM!!!”.

1. Lab Discription(2/2) The source code for phase_1() and others are not provided. Students will use reverse engineer to find out 6 input string.

Binary Bomb Lab 1. Lab Discription 2. Tools to "Defuse" Bombs

2. Tools to "Defuse" Bombs(1/3) How to "DEFUSE'' the bomb disassembling the binary object file to assembly instructions disassembler: objdump.exe objdump -d bomb.exe >> bomb.ass disassembling object file bomb.exe and redirect the instructions to plaintext file bomb.ass Refers to objdump_Tutorial.pdf to get more info

2. Tools to "Defuse" Bombs(2/3) How to "DEFUSE'' the bomb single-step through the instruction in each phase to figure out the "strings" debugger: gdb.exe GDB is the standard debugger that runs on many unix-like systems and works for many programming language including c. Refers to gdb_Tutorial.pdf to get more info

2. Tools to "Defuse" Bombs(3/3) GDB 跟踪调试常用命令 反汇编：objdump -d bomb 查看所有寄存器内容：info registers 打印某一寄存器：p $eip 打印内存内容： x 0x8049034 打印内存内容（以字符串形式）：x/s 0x8049034 设置断点：b 设置断点（地址）： b*0x8049034 运行：run 执行单步： si

Binary Bomb Lab 1. Lab Discription 2. Tools to "Defuse" Bombs 3. Defuse Phase 1

3. Defuse Phase 1(1/2)

3. Defuse Bomb 1(2/2)