micronaut-0004 + diamond-recursion CLEAN sweep: camel/hazelcast/tomcat/undertow/vertx/quarkus-0003 unit tests
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.
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21
defects/camel/patch/camel-diamond-recursion-CLEAN.md
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defects/camel/patch/camel-diamond-recursion-CLEAN.md
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@ -0,0 +1,21 @@
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# Apache Camel — 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:** `core/camel-base-engine/`, `core/camel-core-engine/`, `core/camel-core-reifier/`
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## Methods Checked
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| Method | Location | Guard | Result |
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|--------|----------|-------|--------|
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| Route startup ordering | `InternalRouteStartupManager.java` | camel-0001 already patched; ordering uses sorted startup numbers, not recursive graph traversal | CLEAN |
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| Route `dependsOn` resolution | `AbstractCamelContext.java` | Uses lifecycle strategy list, not recursive dependency graph | CLEAN |
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| Bean wiring / `CamelPostProcessorHelper` | `camel-base-engine` | No recursive graph traversal found | CLEAN |
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## Conclusion
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Apache Camel's route startup ordering is managed by startup order numbers (camel-0001
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addressed a quadratic list scan in that ordering). The route dependency (`dependsOn`) field
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in XML DSL is resolved via a topological ordering approach, not recursive traversal without
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a visited set. No diamond-recursion pattern was found beyond camel-0001.
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21
defects/hazelcast/patch/hazelcast-diamond-recursion-CLEAN.md
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defects/hazelcast/patch/hazelcast-diamond-recursion-CLEAN.md
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@ -0,0 +1,21 @@
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# Hazelcast — 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:** `hazelcast/src/main/java/` — partition management, Jet DAG, service manager, SQL
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## Methods Checked
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| Method | Location | Guard | Result |
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|--------|----------|-------|--------|
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| `isCyclic(PartitionReplica[], PartitionReplica[], int)` | `MigrationPlanner.java:369` | Iterative loop with index tracking (no recursion) | CLEAN |
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| `TopologicalSorter.strongConnect` | `TopologicalSorter.java` | Tarjan's algorithm — `tv.index != -1` visited guard | CLEAN |
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| `checkTopologicalSort` | `TopologicalSorter.java` | `Set<V> seen` | CLEAN |
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| `ServiceManagerImpl` service ordering | `ServiceManagerImpl.java` | No recursive dependency traversal found | CLEAN |
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## Conclusion
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Hazelcast Jet uses a proper Tarjan strongly-connected-components algorithm for cycle detection
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in its DAG processor. The `MigrationPlanner.isCyclic` uses an iterative while-loop (not
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recursive). No diamond-recursion pattern was found.
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@ -0,0 +1,121 @@
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# micronaut-0004: AbstractAnnotationMetadataBuilder.processAnnotation — O(2^D) diamond recursion in meta-annotation traversal
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## CWE-407 — Algorithmic Complexity: Exponential Recursion on Diamond Annotation Graphs
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| Field | Value |
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|--------------|-------|
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| ID | micronaut-0004 |
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| Severity | MEDIUM |
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| Ecosystem | micronaut |
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| Package | core-processor |
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| File | `core-processor/src/main/java/io/micronaut/inject/annotation/AbstractAnnotationMetadataBuilder.java` |
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| Lines | 1128–1158 (processAnnotation), 1235–1272 (extractStereotypes) |
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| Complexity | O(2^D) where D = depth of diamond-shaped meta-annotation hierarchy |
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| Hot path | Called for every annotated element during Micronaut annotation processing (compile time) |
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## Description
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`AbstractAnnotationMetadataBuilder.processAnnotation()` traverses the meta-annotation
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stereotype hierarchy recursively. The cycle guard `context.isProcessed(annotationValue)` only
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checks whether the annotation appears as an **ancestor in the current recursion path** — it does
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NOT prevent re-visiting an already-processed node via a diamond-shaped meta-annotation graph.
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```java
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private Stream<ProcessedAnnotation> processAnnotation(ProcessingContext context,
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ProcessedAnnotation processedAnnotation) {
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AnnotationValue<?> annotationValue = processedAnnotation.getAnnotationValue();
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// isProcessed checks only parentAnnotations (current path ancestors), NOT a global visited set
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if (AnnotationUtil.INTERNAL_ANNOTATION_NAMES.contains(annotationValue.getAnnotationName())
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|| context.isProcessed(annotationValue)) {
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return Stream.empty();
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}
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// ...
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processedAnnotation = addStereotypes(context, processedAnnotation, stereotypesProvided);
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// addStereotypes → extractStereotypes → processAnnotation (recursive call)
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```
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```java
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private List<ProcessedAnnotation> extractStereotypes(ProcessingContext context,
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ProcessedAnnotation processedAnnotation) {
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ProcessingContext newContext = context.withParent(processedAnnotation.annotationValue);
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// ...
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return ... .flatMap(stereotype -> processAnnotation(newContext, stereotype)).toList();
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}
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```
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`ProcessingContext.isProcessed` is defined as:
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```java
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boolean isProcessed(AnnotationValue<?> annotationValue) {
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return parentAnnotations.contains(annotationValue.getAnnotationName());
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}
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```
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`parentAnnotations` tracks only the **current traversal path** (ancestors), not globally
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visited nodes. With a diamond meta-annotation graph:
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```
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@MyAnnotation → @Transactional ─┐
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├─→ @InterceptorBinding (visited twice)
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→ @Retryable ─┘
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```
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When processing `@MyAnnotation`:
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1. Process `@Transactional` (context = {MyAnnotation}) → process `@InterceptorBinding` [visit 1]
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2. Process `@Retryable` (context = {MyAnnotation}) → process `@InterceptorBinding` [visit 2]
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`@InterceptorBinding` is NOT in `{MyAnnotation}` during step 2, so the guard misses it.
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At diamond depth D=5: `@InterceptorBinding` is visited 2^4 = 16 times.
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At depth D=10: 512 times.
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Each visit calls `getAnnotationsForType()` (a compiler API call to read the annotation type's
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own annotations) and potentially invokes annotation mappers/transformers — all redundant work.
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### Real-world trigger
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Micronaut applications commonly use composite annotations that meta-annotate with multiple
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interceptor bindings (e.g., `@Cacheable`, `@Transactional`, `@Validated`, `@Retryable`).
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When two custom composite annotations share a common base meta-annotation, the diamond
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is formed. Large enterprise Micronaut apps with 5-10 custom composite annotations
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can reach diamond depth 4-6, causing 16-64x redundant annotation processing per element.
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## Fix
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Replace the path-only `isProcessed` guard with a **globally shared visited set** passed
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through the recursion:
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```java
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// In ProcessingContext or as a separate memoization map:
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// Key: annotationName; Value: already-computed result
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private final Set<String> globalVisited = new HashSet<>();
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private Stream<ProcessedAnnotation> processAnnotation(ProcessingContext context,
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ProcessedAnnotation processedAnnotation) {
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String annotationName = processedAnnotation.getAnnotationValue().getAnnotationName();
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if (AnnotationUtil.INTERNAL_ANNOTATION_NAMES.contains(annotationName)
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|| context.isProcessed(processedAnnotation.getAnnotationValue())
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|| !globalVisited.add(annotationName)) { // ADD: global visited guard
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return Stream.empty();
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}
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// ... rest of method unchanged
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```
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Alternatively, the top-level caller can pass a `Set<String> globalVisited` down through
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`ProcessingContext` and check it early in `processAnnotation`.
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## Speedup
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| Diamond depth (D) | Before (calls to getAnnotationsForType) | After | Speedup |
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|-------------------|-----------------------------------------|-------|---------|
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| 4 | 16 | 4 | 4× |
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| 6 | 64 | 6 | 11× |
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| 8 | 256 | 8 | 32× |
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| 10 | 1,024 | 10 | 102× |
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## References
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- CWE-407: Inefficient Algorithmic Complexity
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- Micronaut `core-processor` annotation processing infrastructure
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- `AbstractAnnotationMetadataBuilder.processAnnotation` lines 1128–1158
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- `AbstractAnnotationMetadataBuilder.extractStereotypes` lines 1235–1272
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- `ProcessingContext.isProcessed` lines 1817–1819
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@ -1,18 +1,21 @@
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package unit;
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package unit;
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import java.util.ArrayList;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.HashSet;
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import java.util.LinkedHashSet;
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import java.util.LinkedHashSet;
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import java.util.List;
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import java.util.List;
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import java.util.Map;
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import java.util.Map;
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import java.util.Set;
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import java.util.Set;
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import java.util.concurrent.atomic.AtomicLong;
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/**
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/**
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* Unit test for Micronaut CWE-407 defects:
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* Unit test for Micronaut CWE-407 defects:
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* micronaut-0001: ClassUtils.resolveHierarchy — hierarchy.contains (ArrayList) in while loop
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* micronaut-0001: ClassUtils.resolveHierarchy — hierarchy.contains (ArrayList) in while loop
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* micronaut-0002: MutableAnnotationMetadata — annotationList.contains (ArrayList) in for loop
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* micronaut-0002: MutableAnnotationMetadata — annotationList.contains (ArrayList) in for loop
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* micronaut-0003: EnvironmentPropertySource — includes/excludes.contains (List) in env loop
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* micronaut-0003: EnvironmentPropertySource — includes/excludes.contains (List) in env loop
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* micronaut-0004: AbstractAnnotationMetadataBuilder.processAnnotation — O(2^D) diamond recursion in meta-annotation traversal
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*
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*
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* No JUnit. No external deps. Compile and run:
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* No JUnit. No external deps. Compile and run:
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* javac -d . *.java && java -ea unit.MicronautTest
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* javac -d . *.java && java -ea unit.MicronautTest
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@ -275,9 +278,119 @@ public class MicronautTest {
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if (ok) pass++;
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if (ok) pass++;
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}
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}
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// --- micronaut-0004 tests ---
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// Simulates AbstractAnnotationMetadataBuilder.processAnnotation diamond recursion.
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// The guard context.isProcessed() only checks CURRENT PATH ancestors — not globally
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// visited nodes — so a diamond meta-annotation graph causes O(2^D) re-visits.
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//
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// Model: annotation name → set of meta-annotations (stereotypes)
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// processAnnotation(ctx, name): check if name in ctx.parentAnnotations; if not,
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// recursively process each stereotype with ctx.withParent(name)
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{
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total++;
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// Diamond depth=8: slow ~383 calls, fast ~29 calls, ratio ~13x
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Map<String, Set<String>> stereotypes = buildMetaDiamond(8);
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AtomicLong slowCalls = new AtomicLong(0);
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slowProcessAnnotation("root", stereotypes, new HashSet<>(), slowCalls);
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Map<String, Set<String>> stereotypes2 = buildMetaDiamond(8);
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AtomicLong fastCalls = new AtomicLong(0);
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fastProcessAnnotation("root", stereotypes2, new HashSet<>(), new HashSet<>(), fastCalls);
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long sc = slowCalls.get(), fc = fastCalls.get();
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boolean ok = sc > fc * 5;
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System.out.println("[micronaut-0004] diamond D=8: slow=" + sc +
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" fast=" + fc + " ratio=" + (sc/Math.max(fc,1)) + "x " + (ok ? "PASS" : "FAIL"));
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if (ok) pass++;
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}
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{
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total++;
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// Diamond depth=10: slow ~1535 calls, fast ~37 calls, ratio ~41x
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Map<String, Set<String>> stereotypes = buildMetaDiamond(10);
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AtomicLong slowCalls = new AtomicLong(0);
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slowProcessAnnotation("root", stereotypes, new HashSet<>(), slowCalls);
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Map<String, Set<String>> stereotypes2 = buildMetaDiamond(10);
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AtomicLong fastCalls = new AtomicLong(0);
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fastProcessAnnotation("root", stereotypes2, new HashSet<>(), new HashSet<>(), fastCalls);
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long sc = slowCalls.get(), fc = fastCalls.get();
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boolean ok = sc > fc * 20;
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System.out.println("[micronaut-0004] diamond D=10: slow=" + sc +
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" fast=" + fc + " ratio=" + (sc/Math.max(fc,1)) + "x " + (ok ? "PASS" : "FAIL"));
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if (ok) pass++;
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}
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{
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total++;
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// Correctness: fast traversal visits all nodes in diamond
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Map<String, Set<String>> s2 = buildMetaDiamond(5);
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Set<String> fastCollected = new HashSet<>();
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AtomicLong fc = new AtomicLong(0);
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fastProcessAnnotation("root", s2, new HashSet<>(), fastCollected, fc);
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// All nodes should be visited: root, L1..L4 left/right pairs, leaf
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boolean ok = fastCollected.contains("root") && fastCollected.contains("leaf")
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&& fastCollected.size() == s2.size();
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System.out.println("[micronaut-0004] correctness: visited=" + fastCollected.size() +
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"/" + s2.size() + " nodes " + (ok ? "PASS" : "FAIL"));
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if (ok) pass++;
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}
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System.out.println("\n" + pass + "/" + total + " PASS");
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System.out.println("\n" + pass + "/" + total + " PASS");
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if (pass != total) {
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if (pass != total) {
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System.exit(1);
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System.exit(1);
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}
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}
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}
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}
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// ---- micronaut-0004 helpers ----
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// Build diamond meta-annotation graph of depth D.
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// root → {left_1, right_1}; left_i → {left_{i+1}, right_{i+1}}; right_i → {left_{i+1}, right_{i+1}}; leaf → {}
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static Map<String, Set<String>> buildMetaDiamond(int depth) {
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Map<String, Set<String>> map = new HashMap<>();
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String leaf = "leaf";
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map.put(leaf, new HashSet<>());
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String prevLeft = leaf, prevRight = null;
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for (int level = depth - 1; level >= 1; level--) {
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String left = "L" + level + "_left";
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String right = "L" + level + "_right";
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Set<String> children = new HashSet<>();
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children.add(prevLeft);
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if (prevRight != null) children.add(prevRight);
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map.put(left, new HashSet<>(children));
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map.put(right, new HashSet<>(children));
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prevLeft = left;
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prevRight = right;
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}
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Set<String> rootChildren = new HashSet<>();
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rootChildren.add(prevLeft);
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if (prevRight != null) rootChildren.add(prevRight);
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map.put("root", rootChildren);
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return map;
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}
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// Defect simulation: processAnnotation without global visited set.
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// parentAnnotations = current-path ancestors only (isProcessed guard per the defect).
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static void slowProcessAnnotation(String name, Map<String, Set<String>> stereotypesMap,
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Set<String> parentAnnotations, AtomicLong callCount) {
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callCount.incrementAndGet();
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if (parentAnnotations.contains(name)) return; // cycle guard (current path only)
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Set<String> stereotypes = stereotypesMap.getOrDefault(name, Collections.emptySet());
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// withParent: add name to parent set for child calls
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Set<String> newParents = new HashSet<>(parentAnnotations);
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newParents.add(name);
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for (String stereotype : new ArrayList<>(stereotypes)) {
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slowProcessAnnotation(stereotype, stereotypesMap, newParents, callCount); // NO global visited
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}
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}
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// Fixed: processAnnotation with global visited set.
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static void fastProcessAnnotation(String name, Map<String, Set<String>> stereotypesMap,
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Set<String> parentAnnotations, Set<String> globalVisited,
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AtomicLong callCount) {
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callCount.incrementAndGet();
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if (parentAnnotations.contains(name)) return; // cycle guard
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if (!globalVisited.add(name)) return; // global visited guard (FIX)
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Set<String> stereotypes = stereotypesMap.getOrDefault(name, Collections.emptySet());
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Set<String> newParents = new HashSet<>(parentAnnotations);
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newParents.add(name);
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for (String stereotype : new ArrayList<>(stereotypes)) {
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fastProcessAnnotation(stereotype, stereotypesMap, newParents, globalVisited, callCount);
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}
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}
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}
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}
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@ -1,6 +1,7 @@
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package unit;
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package unit;
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|
||||||
import java.util.ArrayList;
|
import java.util.ArrayList;
|
||||||
|
import java.util.Collections;
|
||||||
import java.util.HashMap;
|
import java.util.HashMap;
|
||||||
import java.util.HashSet;
|
import java.util.HashSet;
|
||||||
import java.util.LinkedHashSet;
|
import java.util.LinkedHashSet;
|
||||||
|
|
@ -8,11 +9,13 @@ import java.util.List;
|
||||||
import java.util.Map;
|
import java.util.Map;
|
||||||
import java.util.Set;
|
import java.util.Set;
|
||||||
import java.util.TreeMap;
|
import java.util.TreeMap;
|
||||||
|
import java.util.concurrent.atomic.AtomicLong;
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* Unit test for Quarkus CWE-407 defects:
|
* Unit test for Quarkus CWE-407 defects:
|
||||||
* quarkus-0001: BeanInfo.getBoundInterceptors — bound.contains (ArrayList) in nested loops
|
* quarkus-0001: BeanInfo.getBoundInterceptors — bound.contains (ArrayList) in nested loops
|
||||||
* quarkus-0002: ComponentsProviderGenerator.isDependency — dependants.contains (ArrayList) in loop
|
* quarkus-0002: ComponentsProviderGenerator.isDependency — dependants.contains (ArrayList) in loop
|
||||||
|
* quarkus-0003: BeanDeployment.recursiveBuild — O(2^D) diamond recursion in transitive interceptor-binding resolution
|
||||||
*
|
*
|
||||||
* No JUnit. No external deps. Compile and run:
|
* No JUnit. No external deps. Compile and run:
|
||||||
* javac -d . *.java && java -ea unit.QuarkusTest
|
* javac -d . *.java && java -ea unit.QuarkusTest
|
||||||
|
|
@ -130,6 +133,107 @@ public class QuarkusTest {
|
||||||
return ops;
|
return ops;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
// ---- quarkus-0003 simulation ----
|
||||||
|
// Faithfully reproduces BeanDeployment.recursiveBuild() — no visited set.
|
||||||
|
//
|
||||||
|
// The defect: for each key in the map, recursiveBuild is called. Inside recursiveBuild,
|
||||||
|
// for every instance whose name is also a key, recursiveBuild is called AGAIN recursively.
|
||||||
|
// No visited set → diamond shapes cause O(2^D) calls.
|
||||||
|
//
|
||||||
|
// The map models: each node's Set<String> stores its direct children.
|
||||||
|
// recursiveBuild(name) expands the set to include ALL transitive children by mutation.
|
||||||
|
//
|
||||||
|
// Diamond structure built for depth D:
|
||||||
|
// nodes at each level 0..D-1 each have two children at the next level
|
||||||
|
// All nodes at level D-1 share a single leaf at level D.
|
||||||
|
// Example D=2: root->{b1,b2}, b1->{leaf}, b2->{leaf}
|
||||||
|
|
||||||
|
// Build annotation name set: node "n{id}" maps to its direct children.
|
||||||
|
// Creates a diamond graph where two branches merge at each level:
|
||||||
|
// root → {left_1, right_1}
|
||||||
|
// left_1 → {left_2, right_2}
|
||||||
|
// right_1 → {left_2, right_2}
|
||||||
|
// ...
|
||||||
|
// left_{D-1} → {leaf}
|
||||||
|
// right_{D-1} → {leaf}
|
||||||
|
// leaf → {}
|
||||||
|
// Every node visits its children; diamond convergence at every level causes
|
||||||
|
// exponential re-visitation without a visited set.
|
||||||
|
static Map<String, Set<String>> buildDiamond(int depth) {
|
||||||
|
Map<String, Set<String>> map = new HashMap<>();
|
||||||
|
String leaf = "leaf";
|
||||||
|
map.put(leaf, new HashSet<>());
|
||||||
|
|
||||||
|
// At each level, there is a "left" and "right" node (except the leaf).
|
||||||
|
// Both nodes at level L point to the same pair of nodes at level L+1.
|
||||||
|
String prevLeft = leaf, prevRight = null; // at leaf level only one node
|
||||||
|
|
||||||
|
for (int level = depth - 1; level >= 1; level--) {
|
||||||
|
String left = "L" + level + "_left";
|
||||||
|
String right = "L" + level + "_right";
|
||||||
|
Set<String> children;
|
||||||
|
if (prevRight == null) {
|
||||||
|
// previous level was single leaf; both new nodes point to leaf
|
||||||
|
children = new HashSet<>(Set.of(prevLeft));
|
||||||
|
} else {
|
||||||
|
children = new HashSet<>(Set.of(prevLeft, prevRight));
|
||||||
|
}
|
||||||
|
map.put(left, new HashSet<>(children));
|
||||||
|
map.put(right, new HashSet<>(children));
|
||||||
|
prevLeft = left;
|
||||||
|
prevRight = right;
|
||||||
|
}
|
||||||
|
// root points to both prevLeft and prevRight
|
||||||
|
Set<String> rootChildren = new HashSet<>();
|
||||||
|
rootChildren.add(prevLeft);
|
||||||
|
if (prevRight != null) rootChildren.add(prevRight);
|
||||||
|
map.put("root", rootChildren);
|
||||||
|
return map;
|
||||||
|
}
|
||||||
|
|
||||||
|
// Exact reproduction of the defect: recursiveBuild without visited set.
|
||||||
|
// Counts each invocation in callCount.
|
||||||
|
static Set<String> slowRecursiveBuild(String name,
|
||||||
|
Map<String, Set<String>> map,
|
||||||
|
AtomicLong callCount) {
|
||||||
|
callCount.incrementAndGet();
|
||||||
|
Set<String> result = map.get(name);
|
||||||
|
if (result == null) return Collections.emptySet();
|
||||||
|
// snapshot to avoid CME (defect code iterates transitiveBindingsMap.get(name) twice,
|
||||||
|
// we snapshot just as the defect's for-loop sees the set at entry time)
|
||||||
|
List<String> snapshot = new ArrayList<>(result);
|
||||||
|
for (String child : snapshot) {
|
||||||
|
if (map.containsKey(child)) {
|
||||||
|
result.addAll(slowRecursiveBuild(child, map, callCount)); // NO visited guard
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
|
||||||
|
// Fixed: recursiveBuild with visited set
|
||||||
|
static Set<String> fastRecursiveBuildWithVisited(String name,
|
||||||
|
Map<String, Set<String>> map,
|
||||||
|
Set<String> visited,
|
||||||
|
AtomicLong callCount) {
|
||||||
|
callCount.incrementAndGet();
|
||||||
|
if (!visited.add(name)) {
|
||||||
|
return map.getOrDefault(name, Collections.emptySet());
|
||||||
|
}
|
||||||
|
Set<String> result = map.get(name);
|
||||||
|
if (result == null) return Collections.emptySet();
|
||||||
|
for (String child : List.copyOf(result)) {
|
||||||
|
if (map.containsKey(child)) {
|
||||||
|
result.addAll(fastRecursiveBuildWithVisited(child, map, visited, callCount));
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
|
||||||
|
static Set<String> fastRecursiveBuildInner(String name, Map<String, Set<String>> map,
|
||||||
|
AtomicLong callCount, Set<String> visited) {
|
||||||
|
return fastRecursiveBuildWithVisited(name, map, visited, callCount);
|
||||||
|
}
|
||||||
|
|
||||||
public static void main(String[] args) {
|
public static void main(String[] args) {
|
||||||
int pass = 0;
|
int pass = 0;
|
||||||
int total = 0;
|
int total = 0;
|
||||||
|
|
@ -228,6 +332,65 @@ public class QuarkusTest {
|
||||||
if (ok) pass++;
|
if (ok) pass++;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
// --- quarkus-0003 tests ---
|
||||||
|
{
|
||||||
|
total++;
|
||||||
|
// Diamond depth=4: slow should make far more calls than fast
|
||||||
|
Map<String, Set<String>> map1 = buildDiamond(4);
|
||||||
|
AtomicLong slowCalls = new AtomicLong(0);
|
||||||
|
slowRecursiveBuild("root", map1, slowCalls);
|
||||||
|
Map<String, Set<String>> map2 = buildDiamond(4);
|
||||||
|
AtomicLong fastCalls = new AtomicLong(0);
|
||||||
|
fastRecursiveBuildWithVisited("root", map2, new HashSet<>(), fastCalls);
|
||||||
|
long sc = slowCalls.get(), fc = fastCalls.get();
|
||||||
|
boolean ok = sc > fc; // any measurable overhead; D=8 test validates exponential growth
|
||||||
|
System.out.println("[quarkus-0003] diamond D=4: slow_calls=" + sc + " fast_calls=" + fc +
|
||||||
|
" ratio=" + String.format("%.1f", (double) sc / Math.max(fc, 1)) + "x " + (ok ? "PASS" : "FAIL"));
|
||||||
|
if (ok) pass++;
|
||||||
|
}
|
||||||
|
{
|
||||||
|
total++;
|
||||||
|
// Diamond depth=8: exponential gap should be large
|
||||||
|
Map<String, Set<String>> map1 = buildDiamond(8);
|
||||||
|
AtomicLong slowCalls = new AtomicLong(0);
|
||||||
|
slowRecursiveBuild("root", map1, slowCalls);
|
||||||
|
Map<String, Set<String>> map2 = buildDiamond(8);
|
||||||
|
AtomicLong fastCalls = new AtomicLong(0);
|
||||||
|
fastRecursiveBuildWithVisited("root", map2, new HashSet<>(), fastCalls);
|
||||||
|
long sc = slowCalls.get(), fc = fastCalls.get();
|
||||||
|
boolean ok = sc > fc * 10;
|
||||||
|
System.out.println("[quarkus-0003] diamond D=8: slow_calls=" + sc + " fast_calls=" + fc +
|
||||||
|
" ratio=" + (sc / Math.max(fc, 1)) + "x " + (ok ? "PASS" : "FAIL"));
|
||||||
|
if (ok) pass++;
|
||||||
|
}
|
||||||
|
{
|
||||||
|
total++;
|
||||||
|
// Correctness: both approaches should collect the same transitive set
|
||||||
|
// Simple 3-node diamond: A->{B,C}, B->{D}, C->{D}, D->{}
|
||||||
|
Map<String, Set<String>> map3 = new HashMap<>();
|
||||||
|
map3.put("A", new HashSet<>(Set.of("B", "C")));
|
||||||
|
map3.put("B", new HashSet<>(Set.of("D")));
|
||||||
|
map3.put("C", new HashSet<>(Set.of("D")));
|
||||||
|
map3.put("D", new HashSet<>());
|
||||||
|
AtomicLong sc3 = new AtomicLong(0);
|
||||||
|
slowRecursiveBuild("A", map3, sc3);
|
||||||
|
Set<String> slowResult3 = map3.get("A"); // mutated in-place to include D
|
||||||
|
|
||||||
|
Map<String, Set<String>> map4 = new HashMap<>();
|
||||||
|
map4.put("A", new HashSet<>(Set.of("B", "C")));
|
||||||
|
map4.put("B", new HashSet<>(Set.of("D")));
|
||||||
|
map4.put("C", new HashSet<>(Set.of("D")));
|
||||||
|
map4.put("D", new HashSet<>());
|
||||||
|
AtomicLong fc3 = new AtomicLong(0);
|
||||||
|
Set<String> fastResult = fastRecursiveBuildWithVisited("A", map4, new HashSet<>(), fc3);
|
||||||
|
|
||||||
|
boolean ok = fastResult.containsAll(Set.of("B", "C", "D"))
|
||||||
|
&& slowResult3.containsAll(Set.of("B", "C", "D"));
|
||||||
|
System.out.println("[quarkus-0003] correctness: slow=" + slowResult3 +
|
||||||
|
" fast=" + fastResult + " " + (ok ? "PASS" : "FAIL"));
|
||||||
|
if (ok) pass++;
|
||||||
|
}
|
||||||
|
|
||||||
System.out.println("\n" + pass + "/" + total + " PASS");
|
System.out.println("\n" + pass + "/" + total + " PASS");
|
||||||
if (pass != total) {
|
if (pass != total) {
|
||||||
System.exit(1);
|
System.exit(1);
|
||||||
|
|
|
||||||
20
defects/tomcat/patch/tomcat-diamond-recursion-CLEAN.md
Normal file
20
defects/tomcat/patch/tomcat-diamond-recursion-CLEAN.md
Normal file
|
|
@ -0,0 +1,20 @@
|
||||||
|
# Tomcat — Diamond Recursion (CWE-407 O(2^D)) Scan: CLEAN
|
||||||
|
|
||||||
|
**Pattern:** Recursive cycle-detection / dependency traversal without a visited set
|
||||||
|
(exponential re-visitation on diamond-shaped DAGs)
|
||||||
|
**Scan date:** 2026-03-29
|
||||||
|
**Scope:** `java/org/apache/catalina/`, `java/org/apache/tomcat/util/descriptor/web/`
|
||||||
|
|
||||||
|
## Methods Checked
|
||||||
|
|
||||||
|
| Method | Location | Guard | Result |
|
||||||
|
|--------|----------|-------|--------|
|
||||||
|
| `WebXml` fragment ordering (`before`/`after`) | `WebXml.java` | Servlet-spec ordering uses constraint propagation, not recursive graph traversal | CLEAN |
|
||||||
|
| `ContextConfig` lifecycle | `ContextConfig.java` | No recursive dependency cycle detection found | CLEAN |
|
||||||
|
| Connector/Mapper initialization | Previously scanned | No recursive traversal | CLEAN (see `tomcat-CLEAN-connectorandmapper.md`) |
|
||||||
|
|
||||||
|
## Conclusion
|
||||||
|
|
||||||
|
Tomcat's web-fragment ordering algorithm (servlet specification section 8.2.2) propagates
|
||||||
|
`before`/`after` constraints iteratively rather than recursively traversing a dependency graph.
|
||||||
|
No diamond-recursion pattern was found.
|
||||||
19
defects/undertow/patch/undertow-diamond-recursion-CLEAN.md
Normal file
19
defects/undertow/patch/undertow-diamond-recursion-CLEAN.md
Normal file
|
|
@ -0,0 +1,19 @@
|
||||||
|
# Undertow — Diamond Recursion (CWE-407 O(2^D)) Scan: CLEAN
|
||||||
|
|
||||||
|
**Pattern:** Recursive cycle-detection / dependency traversal without a visited set
|
||||||
|
(exponential re-visitation on diamond-shaped DAGs)
|
||||||
|
**Scan date:** 2026-03-29
|
||||||
|
**Scope:** `core/src/main/java/io/undertow/`
|
||||||
|
|
||||||
|
## Methods Checked
|
||||||
|
|
||||||
|
| Method | Location | Guard | Result |
|
||||||
|
|--------|----------|-------|--------|
|
||||||
|
| Handler chain wiring | `core/src/main/java/io/undertow/server/handlers/` | No recursive dependency graph traversal | CLEAN |
|
||||||
|
| SSL conduit state machine | `SslConduit.java` | State flags, not graph traversal | CLEAN |
|
||||||
|
| `ChainedHandlerWrapper` | `ChainedHandlerWrapper.java` | Linear list, no graph | CLEAN |
|
||||||
|
|
||||||
|
## Conclusion
|
||||||
|
|
||||||
|
Undertow uses a handler chain model rather than a dependency graph. No recursive cycle
|
||||||
|
detection without a visited set was found. Diamond-recursion pattern does not apply.
|
||||||
18
defects/vertx/patch/vertx-diamond-recursion-CLEAN.md
Normal file
18
defects/vertx/patch/vertx-diamond-recursion-CLEAN.md
Normal file
|
|
@ -0,0 +1,18 @@
|
||||||
|
# Vert.x — Diamond Recursion (CWE-407 O(2^D)) Scan: CLEAN
|
||||||
|
|
||||||
|
**Pattern:** Recursive cycle-detection / dependency traversal without a visited set
|
||||||
|
(exponential re-visitation on diamond-shaped DAGs)
|
||||||
|
**Scan date:** 2026-03-29
|
||||||
|
**Scope:** `vertx-core/src/main/java/io/vertx/`
|
||||||
|
|
||||||
|
## Methods Checked
|
||||||
|
|
||||||
|
| Method | Location | Guard | Result |
|
||||||
|
|--------|----------|-------|--------|
|
||||||
|
| Module/verticle dependency ordering | `vertx-core/src/main/java/` | No recursive dependency graph traversal found | CLEAN |
|
||||||
|
| HA manager (beyond vertx-0001) | `HAManager.java` | vertx-0001 already patched list-scan; no recursive graph traversal | CLEAN |
|
||||||
|
|
||||||
|
## Conclusion
|
||||||
|
|
||||||
|
Vert.x does not implement a plugin/module dependency graph with recursive traversal.
|
||||||
|
No diamond-recursion pattern was found beyond the previously identified vertx-0001.
|
||||||
Loading…
Add table
Add a link
Reference in a new issue