gdb 자동화

#!/usr/bin/python

from subprocess import Popen , PIPE
from time import sleep

# shellcode
shellcode = "\x41" * 1000 + "\n"

# opens gdb with parameter executable
# you can also manage stdout and stderr here
proc = Popen( ['gdb' , 'executable'] , bufsize=1 ,stdin=PIPE )

# sample breakpoint
# notice the new line after each command
proc.stdin.write('b *DEADBEEF\n')

# half a second of sleep after each command
sleep(0.5)

# r or run to start debugging the program with GDB
proc.stdin.write('r\n')
sleep(0.5)

# any other commands go here

# this is a loop, will get every command and pass it to GDB
# "leave" == quit GDB and terminate process
# "dump"  == paste shellcode
while True:
    mycommand = raw_input()
    if (mycommand == "leave"):
        # quit gdb
        proc.stdin.write("quit\n")
        break

    # paste shellcode
    if (mycommand == "dump"):
        proc.stdin.write(shellcode)
    # more custom commands go here

    # not a custom command? send it as-is
    else:
        mycommand = mycommand + '\n'
        proc.stdin.write(mycommand)
        sleep(0.5)

# close our pipe
proc.stdin.close()

위의 코드에서 write 하는 값만 적절하게 넣어주면 gdb를 이용한 자동 디버깅이 가능하다. 

출처 : https://parsiya.net/blog/2014-05-25-pasting-shellcode-in-gdb-using-python/