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Swift: Diff-informed queries: phase 3 (non-trivial locations) #20082

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Swift: Diff-informed queries: phase 3 (non-trivial locations) #20082

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cd3fa64
[DIFF-INFORMED] Swift: CleartextStorageDatabase
d10c Jul 16, 2025
6dea73b
[DIFF-INFORMED] Swift: CleartextStoragePreferences
d10c Jul 16, 2025
b1e7239
[DIFF-INFORMED] Swift: InsecureTLS
d10c Jul 16, 2025
4342b2b
[DIFF-INFORMED] Swift: UnsafeWebViewFetch
d10c Jul 16, 2025
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11 changes: 11 additions & 0 deletions swift/ql/lib/codeql/swift/security/CleartextStorageDatabaseQuery.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,17 @@ module CleartextStorageDatabaseConfig implements DataFlow::ConfigSig {
node.asExpr().getType().getUnderlyingType() instanceof DictionaryType and
c.getAReadContent().(DataFlow::Content::TupleContent).getIndex() = 1
}

predicate observeDiffInformedIncrementalMode() { any() }

Location getASelectedSinkLocation(DataFlow::Node sink) {
exists(DataFlow::Node cleanSink | result = cleanSink.getLocation() |
cleanSink = sink.(DataFlow::PostUpdateNode).getPreUpdateNode()
or
not sink instanceof DataFlow::PostUpdateNode and
cleanSink = sink
)
}
}

/**
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11 changes: 11 additions & 0 deletions swift/ql/lib/codeql/swift/security/CleartextStoragePreferencesQuery.qll
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Expand Up @@ -30,6 +30,17 @@ module CleartextStoragePreferencesConfig implements DataFlow::ConfigSig {
// make sources barriers so that we only report the closest instance
isSource(node)
}

predicate observeDiffInformedIncrementalMode() { any() }

Location getASelectedSinkLocation(DataFlow::Node sink) {
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Copilot AI Jul 17, 2025

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The logic in getASelectedSinkLocation is duplicated across CleartextStoragePreferencesQuery.qll and CleartextStorageDatabaseQuery.qll. Consider extracting this common pattern into a shared utility predicate to improve maintainability.

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exists(DataFlow::Node cleanSink | result = cleanSink.getLocation() |
cleanSink = sink.(DataFlow::PostUpdateNode).getPreUpdateNode()
or
not sink instanceof DataFlow::PostUpdateNode and
cleanSink = sink
)
}
}

/**
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4 changes: 4 additions & 0 deletions swift/ql/lib/codeql/swift/security/InsecureTLSQuery.qll
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Expand Up @@ -21,6 +21,10 @@ module InsecureTlsConfig implements DataFlow::ConfigSig {
predicate isAdditionalFlowStep(DataFlow::Node nodeFrom, DataFlow::Node nodeTo) {
any(InsecureTlsExtensionsAdditionalFlowStep s).step(nodeFrom, nodeTo)
}

predicate observeDiffInformedIncrementalMode() {
none() // query selects some Swift nodes (e.g. "[post] self") that have location file://:0:0:0:0, which always fall outside the diff range.
}
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Do you recall if there's any reason we don't give post-update nodes a Location (equal to that of the pre-update node)?

I may do a quick experiment with this (probably after your PR, to avoid complicating things).

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I think it comes down to the use of UnknownLocation when an AstNode is synthesized.

}

module InsecureTlsFlow = TaintTracking::Global<InsecureTlsConfig>;
4 changes: 4 additions & 0 deletions swift/ql/lib/codeql/swift/security/UnsafeWebViewFetchQuery.qll
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Expand Up @@ -28,6 +28,10 @@ module UnsafeWebViewFetchConfig implements DataFlow::ConfigSig {
predicate isAdditionalFlowStep(DataFlow::Node nodeFrom, DataFlow::Node nodeTo) {
any(UnsafeWebViewFetchAdditionalFlowStep s).step(nodeFrom, nodeTo)
}

predicate observeDiffInformedIncrementalMode() {
none() // can't override location accurately because of secondary use in select.
}
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What's the issue here? The only unusual thing I can see in that query is selecting from three possible alert messages.

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This issue is the second flow call (UnsafeWebViewFetchFlow::flowToExpr) in the third disjunct: we can't include it in the location override because of monotonic recursion, but if we exclude it then the --check-diff-informed test fails, as it usually does with these cases of secondary flows. So we can't make these queries diff-informed, but their incrementality story will be handled separately using overlay-informed dataflow.

}

/**
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