hidden instructions

Java Tech Enthusiast

Jun 9, 2024 · Information Security

Exploring Hidden x86 CPU Instructions and Their Security Implications

The article investigates undocumented x86 opcodes, describing a depth‑first search that uses page‑faults to locate hidden instruction boundaries, and reports finding dozens of executable but undocumented instructions on Intel and AMD CPUs, highlighting potential security risks and the need for vigilant hardware analysis.

CPUReverse Engineeringassembly

0 likes · 9 min read

Exploring Hidden x86 CPU Instructions and Their Security Implications

IT Services Circle

Apr 15, 2022 · Information Security

Exploring Hidden x86 CPU Instructions and Their Security Implications

The article investigates whether modern x86 CPUs contain undocumented or hidden instructions, explains how to search the instruction space using a depth‑first algorithm that leverages page‑fault side‑effects to determine instruction length, and presents the results of uncovering such hidden opcodes on Intel and AMD processors, highlighting the potential security risks.

CPUReverse Engineeringhidden instructions

0 likes · 11 min read