russell@unturf.com
8a85da480d
micronaut-0004: AbstractAnnotationMetadataBuilder.processAnnotation O(2^D) diamond recursion in meta-annotation stereotype traversal. isProcessed() guard tracks only current-path ancestors, not globally visited nodes — diamond meta-annotation hierarchies cause exponential re-visits of shared base annotations (e.g. @Transactional + @Retryable both extend @InterceptorBinding). 13x at D=8, 41x at D=10. 10/10 unit tests PASS. quarkus-0003 unit tests: added to QuarkusTest.java for the existing quarkus-0003 BeanDeployment.recursiveBuild diamond defect. 9/9 PASS. CLEAN markers: camel, hazelcast, tomcat, undertow, vertx — no diamond recursion pattern found. Hazelcast uses proper Tarjan algorithm. Tomcat uses iterative constraint propagation.
20 lines
1 KiB
Markdown
20 lines
1 KiB
Markdown
# Tomcat — Diamond Recursion (CWE-407 O(2^D)) Scan: CLEAN
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**Pattern:** Recursive cycle-detection / dependency traversal without a visited set
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(exponential re-visitation on diamond-shaped DAGs)
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**Scan date:** 2026-03-29
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**Scope:** `java/org/apache/catalina/`, `java/org/apache/tomcat/util/descriptor/web/`
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## Methods Checked
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| Method | Location | Guard | Result |
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|--------|----------|-------|--------|
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| `WebXml` fragment ordering (`before`/`after`) | `WebXml.java` | Servlet-spec ordering uses constraint propagation, not recursive graph traversal | CLEAN |
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| `ContextConfig` lifecycle | `ContextConfig.java` | No recursive dependency cycle detection found | CLEAN |
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| Connector/Mapper initialization | Previously scanned | No recursive traversal | CLEAN (see `tomcat-CLEAN-connectorandmapper.md`) |
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## Conclusion
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Tomcat's web-fragment ordering algorithm (servlet specification section 8.2.2) propagates
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`before`/`after` constraints iteratively rather than recursively traversing a dependency graph.
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No diamond-recursion pattern was found.
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