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NOTE: This code was written for OS X Snow Leopard.  For some updates to
support (at least to illustrate how to support) iOS 5.x, see the website
for the "iOS Hacker's Handbook" and the companion downloads for Ch. 5:

http://media.wiley.com/product_ancillary/23/11182041/DOWNLOAD/Ch05code.zip

This book has an entire chapter on the sandbox implementation on iOS.

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Just a handful of utilities that have helped me examine the design of the
XNU Sandbox.kext and friends.