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- NOP_slide abstract "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 sled.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, for example 0x0c0c0c0c), or of instructions that affect program state only inconsequentially, which makes them much more difficult to identify.The entropy of a NOP sled is dependent upon the constraints placed on it. If it can be determined that certain registers are not in use (that is to say, they will be set to a known value before their next use), instructions which manipulate them arbitrarily may be used in the NOP sled. Additionally, if the alignment of both the NOP sled and the instruction pointer are deterministic, multi-byte instructions can be used in a NOP sled without regard to the results of unaligned execution. If the input providing the attack vector into which the NOP sled and payload are to be introduced are filtered (such as accepting only printable characters), the field of possible instructions for inclusion is limited. While instructions part of an architecture extension (such as SSE) may frequently be irrelevant to program state, they cannot be used in a NOP sled targeting a computer on which the extension is not supported.".
- NOP_slide wikiPageExternalLink scan20.html.
- NOP_slide wikiPageID "11247321".
- NOP_slide wikiPageRevisionID "590807160".
- NOP_slide hasPhotoCollection NOP_slide.
- NOP_slide subject Category:Computer_security_exploits.
- NOP_slide type Abstraction100002137.
- NOP_slide type Accomplishment100035189.
- NOP_slide type Act100030358.
- NOP_slide type Action100037396.
- NOP_slide type ComputerSecurityExploits.
- NOP_slide type Event100029378.
- NOP_slide type Feat100036762.
- NOP_slide type PsychologicalFeature100023100.
- NOP_slide type YagoPermanentlyLocatedEntity.
- NOP_slide comment "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 sled.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.".
- NOP_slide label "NOP slide".
- NOP_slide sameAs m.02r4_nm.
- NOP_slide sameAs Q6954925.
- NOP_slide sameAs Q6954925.
- NOP_slide sameAs NOP_slide.
- NOP_slide wasDerivedFrom NOP_slide?oldid=590807160.
- NOP_slide isPrimaryTopicOf NOP_slide.