Chaos Communication Congress

The journey to build a debuggable iPhone (36x81)

: 28, 2019

Development-fused iPhones with hardware debugging features like JTAG are out of reach for many security researchers. This talk takes you along my journey to create a similar capability using off-the-shelf iPhones. We'll look at a way to break KTRR, a custom hardware mitigation Apple developed to prevent kernel patches, and use this capability to load a kernel extension that enables full-featured, single-step kernel debugging with LLDB on production iPhones.