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C#: mass enable diff-informed data flow #19661

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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/cryptography/EncryptionKeyDataFlowQuery.qll
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Expand Up @@ -70,6 +70,8 @@ private module SymmetricKeyConfig implements DataFlow::ConfigSig {

/** Holds if the node is a key sanitizer. */
predicate isBarrier(DataFlow::Node sanitizer) { sanitizer instanceof KeySanitizer }

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/cryptography/HardcodedSymmetricEncryptionKey.qll
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Expand Up @@ -82,6 +82,8 @@ module HardcodedSymmetricEncryptionKey {
succ.asExpr() = mc
)
}

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/CleartextStorageQuery.qll
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Expand Up @@ -32,6 +32,8 @@ private module ClearTextStorageConfig implements DataFlow::ConfigSig {
predicate isSink(DataFlow::Node sink) { sink instanceof Sink }

predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/CodeInjectionQuery.qll
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Expand Up @@ -33,6 +33,8 @@ private module CodeInjectionConfig implements DataFlow::ConfigSig {
predicate isSink(DataFlow::Node sink) { sink instanceof Sink }

predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/CommandInjectionQuery.qll
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Expand Up @@ -42,6 +42,8 @@ module CommandInjectionConfig implements DataFlow::ConfigSig {
* `node` from the data flow graph.
*/
predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/ExposureOfPrivateInformationQuery.qll
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Expand Up @@ -32,6 +32,8 @@ private module ExposureOfPrivateInformationConfig implements DataFlow::ConfigSig
predicate isSink(DataFlow::Node sink) { sink instanceof Sink }

predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/LDAPInjectionQuery.qll
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Expand Up @@ -45,6 +45,8 @@ module LdapInjectionConfig implements DataFlow::ConfigSig {
* `node` from the data flow graph.
*/
predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/LogForgingQuery.qll
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Expand Up @@ -35,6 +35,8 @@ private module LogForgingConfig implements DataFlow::ConfigSig {
predicate isSink(DataFlow::Node sink) { sink instanceof Sink }

predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/MissingXMLValidationQuery.qll
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Expand Up @@ -39,6 +39,8 @@ private module MissingXmlValidationConfig implements DataFlow::ConfigSig {
predicate isSink(DataFlow::Node sink) { exists(sink.(Sink).getReason()) }

predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/ReDoSQuery.qll
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Expand Up @@ -33,6 +33,8 @@ private module ReDoSConfig implements DataFlow::ConfigSig {
predicate isSink(DataFlow::Node sink) { sink instanceof Sink }

predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/RegexInjectionQuery.qll
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Expand Up @@ -33,6 +33,8 @@ private module RegexInjectionConfig implements DataFlow::ConfigSig {
predicate isSink(DataFlow::Node sink) { sink instanceof Sink }

predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/ResourceInjectionQuery.qll
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Expand Up @@ -32,6 +32,8 @@ private module ResourceInjectionConfig implements DataFlow::ConfigSig {
predicate isSink(DataFlow::Node sink) { sink instanceof Sink }

predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/SqlInjectionQuery.qll
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Expand Up @@ -43,6 +43,8 @@ module SqlInjectionConfig implements DataFlow::ConfigSig {
* `node` from the data flow graph.
*/
predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() { any() }
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The related location for this query uses a PathNode instead of Node. Will that cause an issue?

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@michaelnebel michaelnebel Jun 11, 2025 •
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As far as I can tell, I don't think it matters - as this predicate only relates to filtering of source and sink nodes based on an extensible predicate that is pre-populated with a diff range (in which a source and sink should be located).

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Since (AFAIK) PathNode and Node have the same location, it shouldn't make a difference.

}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/TaintedPathQuery.qll
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Expand Up @@ -35,6 +35,8 @@ private module TaintedPathConfig implements DataFlow::ConfigSig {
predicate isSink(DataFlow::Node sink) { sink instanceof Sink }

predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/UrlRedirectQuery.qll
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Expand Up @@ -37,6 +37,8 @@ private module UrlRedirectConfig implements DataFlow::ConfigSig {
predicate isSink(DataFlow::Node sink) { sink instanceof Sink }

predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/XPathInjectionQuery.qll
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Expand Up @@ -43,6 +43,8 @@ module XpathInjectionConfig implements DataFlow::ConfigSig {
* `node` from the data flow graph.
*/
predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/ZipSlipQuery.qll
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Expand Up @@ -30,6 +30,8 @@ private module ZipSlipConfig implements DataFlow::ConfigSig {
predicate isSink(DataFlow::Node sink) { sink instanceof Sink }

predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/src/Likely Bugs/LeapYear/UnsafeYearConstruction.ql
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Expand Up @@ -26,6 +26,8 @@ module UnsafeYearCreationFromArithmeticConfig implements DataFlow::ConfigSig {
oc.getObjectType().getABaseType*().hasFullyQualifiedName("System", "DateTime")
)
}

predicate observeDiffInformedIncrementalMode() { any() }
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Both the primary and related locations are of type PathNode. Is that a problem?

}

module UnsafeYearCreationFromArithmetic =
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2 changes: 2 additions & 0 deletions csharp/ql/src/Security Features/CWE-091/XMLInjection.ql
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Expand Up @@ -45,6 +45,8 @@ module XmlInjectionConfig implements DataFlow::ConfigSig {
mc = node.asExpr()
)
}

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/src/Security Features/CWE-114/AssemblyPathInjection.ql
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Expand Up @@ -41,6 +41,8 @@ module AssemblyPathInjectionConfig implements DataFlow::ConfigSig {
name = "UnsafeLoadFrom" and arg = 0
)
}

predicate observeDiffInformedIncrementalMode() { any() }
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Related location is PathNode.

}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/src/Security Features/CWE-134/UncontrolledFormatString.ql
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Expand Up @@ -22,6 +22,8 @@ module FormatStringConfig implements DataFlow::ConfigSig {
predicate isSink(DataFlow::Node sink) {
sink.asExpr() = any(FormatStringParseCall call).getFormatExpr()
}

predicate observeDiffInformedIncrementalMode() { any() }
}

module FormatString = TaintTracking::Global<FormatStringConfig>;
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2 changes: 2 additions & 0 deletions csharp/ql/src/Security Features/CWE-201/ExposureInTransmittedData.ql
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Expand Up @@ -41,6 +41,8 @@ module ExposureInTransmittedDataConfig implements DataFlow::ConfigSig {
}

predicate isSink(DataFlow::Node sink) { sink instanceof RemoteFlowSink }

predicate observeDiffInformedIncrementalMode() { any() }
}

module ExposureInTransmittedData = TaintTracking::Global<ExposureInTransmittedDataConfig>;
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2 changes: 2 additions & 0 deletions csharp/ql/src/Security Features/CWE-209/ExceptionInformationExposure.ql
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Expand Up @@ -59,6 +59,8 @@ module ExceptionInformationExposureConfig implements DataFlow::ConfigSig {
// Do not flow through Message
sanitizer.asExpr().getType().(RefType).getABaseType*() instanceof SystemExceptionClass
}

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/src/Security Features/CWE-327/DontInstallRootCert.ql
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Expand Up @@ -37,6 +37,8 @@ module AddCertToRootStoreConfig implements DataFlow::ConfigSig {
sink.asExpr() = mc.getQualifier()
)
}

predicate observeDiffInformedIncrementalMode() { any() }
}

module AddCertToRootStore = DataFlow::Global<AddCertToRootStoreConfig>;
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2 changes: 2 additions & 0 deletions csharp/ql/src/Security Features/CWE-327/InsecureSQLConnection.ql
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Expand Up @@ -40,6 +40,8 @@ module InsecureSqlConnectionConfig implements DataFlow::ConfigSig {
)
)
}

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/src/Security Features/InsecureRandomness.ql
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Expand Up @@ -49,6 +49,8 @@ module Random {
// succ = array_or_indexer[pred] - use of random numbers in an index
succ.asExpr().(ElementAccess).getAnIndex() = pred.asExpr()
}

predicate observeDiffInformedIncrementalMode() { any() }
}

/**
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