codeql-queries/cpp/lib/trailofbits/itergator/DataFlow.qll at 66df0dc484252256ffb79033e0b8d461f4d52653 · trailofbits/codeql-queries · GitHub

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private import cpp
private import trailofbits.itergator.Iterators
import semmle.code.cpp.dataflow.new.DataFlow

private module IteratorFlowConfig implements DataFlow::ConfigSig {
  predicate isSource(DataFlow::Node source) {
    source.asExpr() instanceof Access or
    exists(source.asParameter())
  }

  predicate isSink(DataFlow::Node sink) { sink.asExpr().(Access).getTarget() instanceof Iterator }

  predicate isBarrier(DataFlow::Node node) {
    node.asExpr().(FunctionCall).getTarget() instanceof CopyConstructor
  }
}

module IteratorFlow = DataFlow::Global<IteratorFlowConfig>;

private module IteratedFlowConfig implements DataFlow::ConfigSig {
  predicate isSource(DataFlow::Node source) {
    source.asExpr() instanceof Access or
    exists(source.asParameter())
  }

  predicate isSink(DataFlow::Node sink) { sink.asExpr() instanceof Iterated }

  predicate isBarrier(DataFlow::Node node) {
    node.asExpr().(FunctionCall).getTarget() instanceof CopyConstructor
  }
}

module IteratedFlow = DataFlow::Global<IteratedFlowConfig>;

private module InvalidationFlowConfig implements DataFlow::ConfigSig {
  predicate isSource(DataFlow::Node source) {
    exists(Access a | a = source.asExpr()) or
    exists(source.asParameter())
  }

  predicate isSink(DataFlow::Node sink) { exists(Invalidation i | sink.asExpr() = i.getAChild()) }

  predicate isBarrier(DataFlow::Node node) {
    node.asExpr().(FunctionCall).getTarget() instanceof CopyConstructor
  }
}

module InvalidationFlow = DataFlow::Global<InvalidationFlowConfig>;

private module InvalidatorFlowConfig implements DataFlow::ConfigSig {
  predicate isSource(DataFlow::Node source) { exists(source) }

  predicate isSink(DataFlow::Node sink) {
    sink.asExpr().getEnclosingElement() instanceof Invalidator
  }

  predicate isBarrier(DataFlow::Node node) {
    node.asExpr().(FunctionCall).getTarget() instanceof CopyConstructor
  }
}

module InvalidatorFlow = DataFlow::Global<InvalidatorFlowConfig>;