Stop the back trace when we hit userland or we find some badly aligned kernel stack. Set an upper bound in case our stack is trashed and we loop. -Stop the back trace when we hit userland or we find some badly aligned kernel stack. Set an upper b

利用Denso机械臂进行查找边界的源代码，有两种方法可以使用，一是二分法，另一个是步进方法。-find bound