Network I/O Extensibility without Administrator Privilege

T. Okumura, B. Childers, D. Mossé
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引用次数: 0

Abstract

Kernel extension mechanisms for network I/O are very useful for creating customized packet processing. However, such extensions have been accessible only to system administrators for security reasons. This paper investigates an approach to realize network I/O extensibility without administrator privilege. To this end, we build on a novel virtualization scheme developed for network control, hierarchical virtualization of network interfaces, which allows recursive creation of the virtualized network interfaces and attaches the created interfaces to OS entities, such as sockets and processes. We show that the hierarchical virtualization has desirable properties for safe execution of packet processing code inside OS kernels, even by ordinary users and untrusted applications. For proof-of-concept, functionality of the system is demonstrated by a prototype implementation and execution profiling is taken to verify if such a kernel extensibility can be realized at practical performance overhead. The systematic experiments illustrated that the hierarchical virtualization can realize kernel extensibility without administrator privilege.
没有管理员权限的网络I/O可扩展性
网络I/O的内核扩展机制对于创建定制的数据包处理非常有用。但是,出于安全原因,只有系统管理员可以访问这些扩展。本文研究了一种无需管理员权限即可实现网络I/O可扩展性的方法。为此,我们建立了一种用于网络控制的新型虚拟化方案,即网络接口的分层虚拟化,它允许递归地创建虚拟化的网络接口,并将创建的接口附加到操作系统实体(如套接字和进程)上。我们展示了分层虚拟化对于在操作系统内核中安全执行包处理代码具有理想的特性,即使是普通用户和不受信任的应用程序也是如此。对于概念验证,通过原型实现演示系统的功能,并采用执行分析来验证这种内核可扩展性是否可以在实际性能开销下实现。系统实验表明,分层虚拟化可以在没有管理员权限的情况下实现内核的可扩展性。
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