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The person you are replying to has discovered multiple exploitable bugs in Illumos via DTrace from inside zones:

Here are the first two that pop up if you google his name. http://www.zerodayinitiative.com/advisories/ZDI-16-168/ http://www.zerodayinitiative.com/advisories/ZDI-16-274/

He gave a talk at DTrace conf 2016 about all the security vulnerabilities he personally found in DTrace in SmartOS. Here are the slides: http://slides.com/benmurphy/deck