SECURITY Signal 142
Compiler Can Undo Your Security Checks
↗
Security researcher Chris Domas explains how legal compiler optimizations can strip security protections from C code, delete memory-clearing operations, and introduce time-of-check to time-of-use vulnerabilities, with data size affecting whether a binary is vulnerable.
Developers who write secure C code cannot assume the shipped binary matches their source-level intent, because compiler optimizations can silently remove protections. Security review must therefore include the optimized build and the exact binary that will be deployed. The finding that AI analysis of 500 million lines of open-source code identified 300 potentially dangerous patterns suggests the problem is widespread.
Written by elseif from the cluster below · every claim links back to a sourceThe three things worth knowing
Legal compiler optimizations can remove security protections and delete memory-clearing operations from C code.
Data size affects vulnerability, with 17 or 33 bytes safe while nearby sizes produce vulnerable code.
Developers should enable compiler warnings, use sanitizers, analyze optimized builds, and test the exact shipped binary.
THE CLUSTER