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Secure Operating Systems
Lesson 10h: Open versus Closed Source
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Where are we? Time for a debate: open versus closed source systems
We’ve pretty much done with a lot of the core topics, yay!
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Open Source For the sake of discussion, what do we mean by “open source”?
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Arguments for Open Source?
“Many eyeballs” Makes security through obscurity “impossible” Opens up code reuse… (is this a pro or a con?) Allows someone to patch their own system once a vuln is announced (can also be a con)
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Arguments for Closed Source?
Patch management is simplified – harder to reverse engineer exploit Cost to the attacker (possibly false sense of security though) More control – paid employees Centralized
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Data: Days of Risk? What meaningful things can we measure about OS security? Well, one is days of risk
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Data: A Tale of Four Kernels
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We found a vuln, oh noes! Open Source: Closed Source:
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Modular v. Monolithic? Open Source: Closed Source:
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To Do Read “A Tale of Four Kernels”
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Questions & Comments What do you want to know?
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