Down the Rabbit Hole - Reverse Engineering Mac OS X

Single-Instruction OverwritingBenefits:Atomic replacement. Safe in the face of multiplepreemptive threads calling the original function.Less likely to harmfully impact the original code. If youwish to reenter the original function from theoverride, you’ll need to re-execute the replacedinstruction. Moving less code around makes thismore likely to work.Compatibility. Works with the widest variety offunction prologs and other patchingimplementations (including our own!)Monday, February 9, 2009