// 步骤2：倒序遍历（从最后一个人往前推，符合"找右侧元素"的直觉）
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The critical thing to understand is namespaces are visibility walls, not security boundaries. They prevent a process from seeing things outside its namespace. They do not prevent a process from exploiting the kernel that implements the namespace. The process still makes syscalls to the same host kernel. If there is a bug in the kernel’s handling of any syscall, the namespace boundary does not help.，详情可参考Safew下载
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