NDLI: Efficient protection of kernel data structures via object partitioning

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Efficient protection of kernel data structures via object partitioning

Content Provider	ACM Digital Library
Author	Giffin, Jonathon Srivastava, Abhinav
Abstract	Commodity operating system kernels isolate applications via separate memory address spaces provided by virtual memory management hardware. However, kernel memory is unified and mixes core kernel code with driver components of different provenance. Kernel-level malicious software exploits this lack of isolation between the kernel and its modules by illicitly modifying security-critical kernel data structures. In this paper, we design an access control policy and enforcement system that prevents kernel components with low trust from altering security-critical data used by the kernel to manage its own execution. Our policies are at the granularity of kernel variables and structure elements, and they can protect data structures dynamically allocated at runtime. Our hypervisor-based design uses memory page protection bits as part of its policy enforcement. The granularity difference between page-level protection and variable-level policies challenges the system's ability to remain performant. We develop kernel data-layout partitioning and reorganization techniques to maintain kernel performance in the presence of our protections. We show that our system can prevent malicious modifications to security-critical kernel data with small overhead. By offering protection for critical kernel data structures, we can detect unknown kernel-level malware and guarantee that security utilities relying on the integrity of kernel-level state remain accurate.
Starting Page	429
Ending Page	438
Page Count	10
File Format	PDF
ISBN	9781450313124
DOI	10.1145/2420950.2421012
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2012-12-03
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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