Control Flow Integrity
Control Flow Integrity (CFI) is a security mechanism that protects software from control-flow hijacking attacks, such as return-oriented programming (ROP) and jump-oriented programming (JOP). It works by enforcing a predetermined control-flow graph (CFG) at runtime, ensuring that indirect branches (e.g., function pointers, virtual calls) only target valid destinations. This helps prevent attackers from redirecting program execution to malicious code.
Developers should learn and implement CFI when building security-critical applications, such as operating systems, web browsers, or embedded systems, to mitigate memory corruption vulnerabilities like buffer overflows. It is particularly useful in environments where code integrity is paramount, such as in financial software, IoT devices, or systems handling sensitive data, as it adds a layer of defense against exploitation attempts that bypass traditional security measures like ASLR and DEP.