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中文摘要：
提出一种在不可信操作系统中保护应用程序的新方法 App ISO.针对传统的虚拟化方法的高开销问题,App ISO在不可信操作系统的同一特权层引入内可信基,代替虚拟机监控器实施应用程序保护,避免了昂贵的特权层切换.同时利用硬件虚拟化,以及页表锁定、影子IDT、切换页面等软件技术保证内可信基的安全性.证明了所提内可信基方法与虚拟化方法具有同样的高安全性.实验和分析结果表明,内可信基方法可显著地提高系统性能.
英文摘要：
This paper presents App ISO, a novel approach to provide whole-application protection in an untrusted operating system（OS）. Unlike previous virtualization-based approach, App ISO does not directly use any higher privilege hypervisor for application protection, which is known to cause high overhead due to frequent privilege transitions. Instead, App ISO introduces a software component named Inner TCB running in the same privilege layer with the untrusted OS, and uses Inner TCB to realize application protection. Meanwhile App ISO leverages hardware virtualization and software techniques such as page table lockdown, shadow IDT, and transition page to guarantee the security and isolation of Inner TCB. This paper proves that Inner TCB can achieve the same level of security as hypervisor, and experimental results show that the presented approach has significant improvement in performance.
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