Patch space
An unused block of bits left in a binary so that it can later be modified by insertion of machine-language instructions there (typically, the patch space is modified to contain new code, and the superseded code is patched to contain a jump or call to the patch space).
The widening use of HLLs has made this term rare; it is now primarily historical outside IBM shops.
See patch, zap, hook.
[Jargon File]
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