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Usually a Windows/Linux operating system uses afaik max 2 rings

But how many rings does OpenBSD use?

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That was a CPU concept, and OS is a wrapper function, am I wrong? –  warl0ck Nov 5 '12 at 8:57
    
afaik for example: OpenVMS used 4 rings. and imho the more rings are used the more secure the OS could be, -> KISS principle. –  gasko peter Nov 5 '12 at 11:27
    
STOP used to have 3 rings, but I think the newest version was reduced to 2 for the sake of speed :( –  Marcin Nov 5 '12 at 14:48
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More rings doesn't particularly translate to more security. It's not how many rings you have, it's how you use them. –  Gilles Nov 5 '12 at 22:36
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One Ring for the Elvis editor and Plone, // One for user processes doomed to die, // Three for the kernel in its dark zone // In OpenBSD where the Blowfish lie. [No, I don't know whether OpenBSD actually uses more than two rings.] –  Gilles Nov 5 '12 at 23:12
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