Department of Computer and Information Sciences Towson University Towson MD 21252 USA Authors William Thompson Ramesh Karne Sonjie Liang Alexander Wijesinha Hamdan Alabsi and ID: 807764
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Presented by Dr. Ramesh K. Karne Department of Computer and Information Sciences Towson UniversityTowson, MD 21252, USA(Authors: William Thompson, Ramesh Karne, Sonjie Liang, Alexander Wijesinha, Hamdan Alabsi, and Hojin Chang)rkarne@towson.eduhttp://baremachine.towson.edu
Design and Implementation of a USB File System for Bare PC Applications
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Started in 2001 Motivated by complexity and obsolescence Frustrated by too many environments Initially funded by NSF grants Over 45 publications and 15 doctoral dissertations Started from scratch and built all BMC code and over a dozen complex applications History
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ExokernelBare Metal LinuxNano and Micro Kernels Lean kernels Sandboxing Palacio and Kitten IO-Lite Related Work
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A computer application(s) run on a bare computing device (such as a PC) The computing device consists of CPU, Memory, User interfaces such as (Keyboard, Mouse, Monitor, Network card) Application(s) are self contained, self managed The box containing the computing device is known as a bare machine The concept is applicable any computing device What is a Bare Machine Computing (BMC)?
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A Bare Machine is: OwnerlessValueless, no valuable resources in the bare box Uses detachable or network storage Bootable, loadable and controllable by user application(s) Application(s) are stored on a detachable storage device such as a flash drive There is nothing to damage in the bare machine, other than physical vandalism Super secure, ultimate security for application(s) A bare machine can be placed any place, accessed by anyone without ownership A bare machine application is stable, not prone to obsolescence, contains code that does not depend on other computing environments A bare machine application(s) are totally user controlled and closed systems.
BMC Characteristics
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It is a standard FAT32 compatible file systemUSB based Runs only on a x86 compatible PCs, can be extended to other CPU architectures by writing direct API The files can be accessible on other OSs Lean, efficient and application driven Resident on detachable devices No OS vulnerabilities Closed system What is a bare PC File System?
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USB Layout
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Memory Layout
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Initialization Process
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File Table Structure
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File API
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Use of API
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USB Parameters and Driver
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USB Operations
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USB Analyzer Trace
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Bare Root Directory
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Root Directory on USB
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Bare PC Screen Shot
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Broad knowledge for a programmer Device driver knowledge System and application programming Debugging bare code Reducing semantic-gap between application and hardware Integrating with other bare PC applications Design Challenges
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Further Research Multiple USBs for storage Integrating with SQLITE database and others Integrating with Web server and Webmail
Extending to NFS and other file system protocols
Performance comparison with conventional systems
Adding security to USB flash drives
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Conclusions Presented a novel computing architecture (BMC) Described internals of a bare PC file system Possible use in super-secure applications
Bare to bare applications are super-secure
Identified further research