This is big research. Stack overflows (exaustion) _are_ exploitable in user space.
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turns out it has been around for over a decade
An Ancient Kernel Hole is (Not) Closed: grsecurity.net/an_ancient_ke…. A lesson in real non-embargoed security.
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Yup, what's funny is that we tested vfprintf to jump over the guard page on a grsecurity kernel. :) (even though the post says not affected)
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