def canary
      return Nil.instance unless load?

      addr = @info.auxv[:random]
      Helper.unpack(bits / 8, @dumper.dump(addr, bits / 8)) & 0xffffffffffffff00
    end
def canary
      return Nil.instance unless load?

      addr = @info.auxv[:random]
      Helper.unpack(bits / 8, @dumper.dump(addr, bits / 8)) & 0xffffffffffffff00
    end
Get the value of stack guard.

 @return [Integer]
 @example
   h.canary
   #=> 11342701118118205184 # 0x9d695e921adc9700