Debugging your ROP

Print your payload:

print payload

Pipe it into a file:

EverTokki@pico-2018-shell:~/rop$ python test.py > input

Breakpoint where your program returns:

EverTokki@pico-2018-shell:~/rop$ gdb -q gets

Reading symbols from gets...(no debugging symbols found)...done.

gdb-peda$ b *0x080488a2

Breakpoint 1 at 0x80488a2

Run it with your payload:

gdb-peda$ r < input

Starting program: /home/EverTokki/rop/gets < input

GIVE ME YOUR NAME!

Display your current pc (instruction): 

Breakpoint 1, 0x080488a2 in vuln ()

gdb-peda$ disp/3i $pc 

1: x/3i $pc

=> 0x80488a2 <vuln+38>: ret    

   0x80488a3 <main>: lea    ecx,[esp+0x4]

   0x80488a7 <main+4>: and    esp,0xfffffff0

Step into instructions:
gdb-peda$ si

Keep watching your registers and note when it screws up.