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Go functions can be redefined at runtime by manipulating memory directly, despite lacking language-level support for monkey patching. The technique involves using reflection to get function addresses, modifying memory page permissions with mprotect, and writing JMP instructions to redirect execution. The article provides working x86 and ARM64 implementations, explains how to handle instruction encoding and cache invalidation, and warns about serious limitations including inline functions, generics, and struct layout mismatches that can cause crashes or memory corruption.

Redefining Go Functions

For heaven’s sake, just don’t. The W^X paradigm is here for a reason.