posted by Thom Holwerda on Thu 16th Aug 2018 20:50 UTC
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The security benefits of keeping a system's trusted computing base (TCB)small has long been accepted as a truism, as has the use of internal protection boundaries for limiting the damage caused by exploits. Applied to the operating system, this argues for a small microkernel as the core of the TCB, with OS services separated into mutually-protected components (servers) - in contrast to "monolithic" designs such as Linux, Windows or MacOS. While intuitive, the benefits of the small TCB have not been quantified to date. We address this by a study of critical Linux CVEs, where we examine whether they would be prevented or mitigated by a microkernel-based design. We find that almost all exploits are at least mitigated to less than critical severity, and 40% completely eliminated by an OS design based on a verified microkernel, such as seL4.


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