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

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

3. 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!!!”.

4. 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.

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

6. 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

7. 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

8. 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 0x
打印内存内容（以字符串形式）：x/s 0x
设置断点：b
设置断点（地址）： b*0x
运行：run
执行单步： si

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

10. 3. Defuse Phase 1(1/2)

11. 3. Defuse Bomb 1(2/2)