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Python: disable diff-informed PolynomialReDoS.ql #19379

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Apr 25, 2025
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Python: disable diff-informed PolynomialReDoS.ql #19379

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12 changes: 11 additions & 1 deletion python/ql/lib/semmle/python/security/dataflow/PolynomialReDoSQuery.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,17 @@ private module PolynomialReDoSConfig implements DataFlow::ConfigSig {

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

predicate observeDiffInformedIncrementalMode() { any() }
// Diff-informed incremental mode is currently disabled for this query due to
// API limitations. The query exposes sink.getABacktrackingTerm() as an alert
// location, but there is no way to express that information through
// getASelectedSinkLocation() because there is no @location in the CodeQL
// database that corresponds to a term inside a regular expression. As a
// result, this query could miss alerts in diff-informed incremental mode.
//
// To address this problem, we need to have a version of
// getASelectedSinkLocation() that uses hasLocationInfo() instead of
// returning Location objects.
predicate observeDiffInformedIncrementalMode() { none() }

Location getASelectedSinkLocation(DataFlow::Node sink) {
result = sink.(Sink).getHighlight().getLocation()
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