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> Through lots of trial and error, swizzling, mach_inject, and mach_override they managed to provide this feature in OS X as well.

And it's not unlikely that Apple will break them at any time. Apple won't even go through the trouble of making an announcement when they do so.

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In fact, I believe they are doing exactly this in El Capitan. Under the umbrella of "Rootless", you will no longer be able to arbitrarily modify [1] some special blessed OS processes, like Finder.app.

Some discussion of the politics of this issue: http://atp.fm/episodes/128

[1] haven't read enough to know the exact mechanism, but presumably restricting some forms of IPC like Mach messages?

I'm sure they understood the risk when they did it.

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