In a compiled language there may be multiple ways to write a loop, but the underlying object code generated is the same. A loop is a loop, regardless of how it's represented in the language. Security products that insert shims into the stack, run as a proxy on the server, or reside in the network can look for anomalies in that object code. This is the basis for many types of network security - IDS, IPS, AVS, intelligent firewalls. They look for anomalies in signatures and if they find one they consider it a threat.
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