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In reply to Comment by Reader Nix

Andrew Ayer on 2014-07-16 at 01:23:

I had a feeling it was mlock(), but I couldn't think of a good way to check if a page is locked. OpenBSD provides a really nifty way to detect forks: you can use the minherit() syscall with the INHERIT_ZERO argument to specify that a page should be replaced with zeros when forking. This experience has been a real eye opener to how an operating system can make it easier to write a secure crypto library.

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