Preface: Starting with Oracle 11g release 1 (11.1), there is a just-in-time (JIT) compiler for Oracle JVM environment. A JIT compiler for Oracle JVM enables much faster execution because, it manages the invalidation, recompilation, and storage of code without an external mechanism.

Background: A way to prevent attack code execution by stack and heap. It marking stack and heap as non-executable. However some apps need executable heap (For instance JIT compiler), so it does not defend against `Return Oriented Programming’ exploits.

What is ROP exploit technique: Return–oriented programming (ROP) is a computer security exploit technique that allows an attacker to execute code in the presence of security defenses such as executable space protection and code signing.

New Intel processor implement new preventive architecture: New Tiger Lake processors provides two new key capabilities to help guard against control-flow hijacking malware: Shadow Stack (SS) and Indirect Branch Tracking (IBT). For more details, please see follow link – https://software.intel.com/sites/default/files/managed/4d/2a/control-flow-enforcement-technology-preview.pdf