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| Content Provider | ACM Digital Library |
|---|---|
| Author | Yu, Miao Li, Bingyu Wang, Junqing Qi, Zhengwei Guan, Haibing |
| Abstract | One of the most fundamental issues in computer security is protecting sensitive files from unauthorized access. Traditional file protection tools run inside the target operating system, which hosts sensitive files. This makes previous approaches vulnerable in face of a compromised OS. To address this limitation, recent approaches seek for a good isolation by putting file system into a dedicated virtual machine or by using a network file system. However, they suffer a sharp increase in trusted computing base size which degrades their reliability. In this paper, we present Filesafe, a special purpose hy-pervisor aimed at protecting sensitive files in a compromised operating system. It bridges the semantic gap between guest OS and hypervisor by reconstructing file hierarchy from raw data, which incurs no runtime overhead. By enforcing security policies created in hypervisor, Filesafe could prevent sensitive files from unauthorized access even if they have kernel privileges in guest OS. We have implemented a proof-of-concept prototype on Windows XP with FAT32 file system. Furthermore, we evaluate Filesafe's performance and code size to demonstrate it is practical in real world scenarios. |
| Starting Page | 1765 |
| Ending Page | 1770 |
| Page Count | 6 |
| File Format | |
| ISBN | 9781450308571 |
| DOI | 10.1145/2245276.2232063 |
| Language | English |
| Publisher | Association for Computing Machinery (ACM) |
| Publisher Date | 2012-03-26 |
| Publisher Place | New York |
| Access Restriction | Subscribed |
| Subject Keyword | File protection Hardware assisted virtualization Hypervisor Semantic gap |
| Content Type | Text |
| Resource Type | Article |
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