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seL4: Formal Verification of an OS Kernel (2009)
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| Venue: | ACM SYMPOSIUM ON OPERATING SYSTEMS PRINCIPLES |
| Citations: | 286 - 45 self |
BibTeX
@INPROCEEDINGS{Klein09sel4:formal,
author = {Gerwin Klein and Kevin Elphinstone and Gernot Heiser and June Andronick and David Cock and Philip Derrin and Dhammika Elkaduwe and Kai Engelhardt and Rafal Kolanski and Michael Norrish and Thomas Sewell and Harvey Tuch and Simon Winwood},
title = {seL4: Formal Verification of an OS Kernel},
booktitle = {ACM SYMPOSIUM ON OPERATING SYSTEMS PRINCIPLES},
year = {2009},
pages = {207--220},
publisher = {ACM}
}
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Abstract
Complete formal verification is the only known way to guarantee that a system is free of programming errors. We present our experience in performing the formal, machine-checked verification of the seL4 microkernel from an abstract specification down to its C implementation. We assume correctness of compiler, assembly code, and hardware, and we used a unique design approach that fuses formal and operating systems techniques. To our knowledge, this is the first formal proof of functional correctness of a complete, general-purpose operating-system kernel. Functional correctness means here that the implementation always strictly follows our high-level abstract specification of kernel behaviour. This encompasses traditional design and implementation safety properties such as the kernel will never crash, and it will never perform an unsafe operation. It also proves much more: we can predict precisely how the kernel will behave in every possible situation. seL4, a third-generation microkernel of L4 provenance, comprises 8,700 lines of C code and 600 lines of assembler. Its performance is comparable to other high-performance L4 kernels.
Keyphrases
formal verification o kernel functional correctness implementation safety property first formal proof unsafe operation high-level abstract specification high-performance l4 kernel l4 provenance general-purpose operating-system kernel sel4 microkernel unique design approach kernel behaviour abstract specification known way complete formal verification machine-checked verification system technique possible situation traditional design third-generation microkernel
