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Concept
NOP slide
Summary
In computer security, a NOP slide, NOP sled or NOP ramp is a sequence of NOP (no-operation) instructions meant to "slide" the CPU's instruction execution flow to its final, desired destination whenever the program branches to a memory address anywhere on the slide.
The technique sees common usage in software exploits, where it is used to direct program execution when a branch instruction target is not known precisely. Other notable applications include defensive programming strategies such as EMC-aware programming.
While a NOP slide will function if it consists of a list of canonical NOP instructions, the presence of such code is suspicious and easy to automatically detect. For this reason, practical NOP slides are often composed of non-canonical NOP instructions (such as moving a register to itself or adding zero), or of instructions that affect program state only inconsequentially, which makes them much more difficult to identify.
A NOP-sled is the olde
Official source
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