Preventing stack guard-page hopping

Normally, the -rc6 kernel testing release is not the place where one would expect to find a 900-line memory-management change. As it happens, though, such a change was quietly merged immediately prior to the 4.12-rc6 release; indeed, it may have been the real reason behind 4.12-rc6 coming out some hours later than would have been expected. This change is important, though, in that it addresses a newly publicized security threat that, it seems, is being actively exploited.

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