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[20160422] Two more NetBSD Security Advisories: compatibility layers, Bozohttpd
Two more security advisories have been released:

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[20050914] Compat code restructuring status
Christos has committed his compat code restructuring mentioned here a few days ago, and he also posted an outline of the changes and how to handle things in the future.

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[20050910] Upcoming compat kernel and libc changes
Christos Zoulas has made a stab at revamping the compat infrastructure of the kernel and libc, see his posting for all the information.

As far as I understand, the problem addressed by the compat framework is to "version" system call, i.e. to have (say) an old version 1.2 and a new version 1.3 of things like stat(2) and glob(3) with different semantics and arguments. The way this is done right now is similar to adding some #defines that make glob(3) and stat(2) calls really call things like __glob13() and __stat13(), which then map to the apporpriate kernel versions. That way old binaries will still work, even when they were linked against functions stat() and glob() (i.e. when they were linked before the system call was started to get versioned at all). Christos' work tries to sort out the resulting mess that evolved over time from this by moving around header files etc.

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Disclaimer: All opinion expressed here is purely my own. No responsibility is taken for anything.

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