Mondrian Memory Protection

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Mondrian Memory Protection (2002)

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by Emmett Witchel , Josh Cates , Krste Asanovic

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124 - 3 self

BibTeX

@MISC{Witchel02mondrianmemory,
    author = {Emmett Witchel and Josh Cates and Krste Asanovic},
    title = {Mondrian Memory Protection},
    year = {2002}
}

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Abstract

Mondrian memory protection (MMP) is a fine-grained protection scheme that allows multiple protection domains to flexibly share memory and export protected services. In contrast to earlier pagebased systems, MMP allows arbitrary permissions control at the granularity of individual words. We use a compressed permissions table to reduce space overheads and employ two levels of permissions caching to reduce run-time overheads. The protection tables in our implementation add less than 9% overhead to the memory space used by the application. Accessing the protection tables adds less than 8% additional memory references to the accesses made by the application. Although it can be layered on top of demandpaged virtual memory, MMP is also well-suited to embedded systems with a single physical address space. We extend MMP to support segment translation which allows a memory segment to appear at another location in the address space. We use this translation to implement zero-copy networking underneath the standard read system call interface, where packet payload fragments are connected together by the translation system to avoid data copying. This saves 52% of the memory references used by a traditional copying network stack.

Keyphrases

mondrian memory protection share memory protection table standard read system call interface packet payload fragment memory reference additional memory reference traditional copying network stack single physical address space translation system multiple protection domain space overhead pagebased system arbitrary permission control individual word memory segment address space run-time overhead segment translation fine-grained protection scheme memory space demandpaged virtual memory embedded system compressed permission table

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