The Teensy Executable Revisited

The author demonstrates how to create a minimal ELF executable that strictly conforms to the ELF specification while reducing its size from 91 bytes to 83 bytes, primarily by overlapping the ELF header and program header table as explicitly permitted by the specification. By exploiting the "unspecified contents" allowance for the p_paddr field, the author further optimizes the executable by embedding program code into this field, achieving even greater size reduction while maintaining full standards compliance.