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C++: Use the pruning stage in the product-flow configuration.

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Mathias Vorreiter Pedersen
2023-06-29 16:50:57 +01:00
parent f8b1dc9f59
commit 59d9c6e3f2
1 changed files with 6 additions and 1 deletions
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7
cpp/ql/src/Security/CWE/CWE-119/OverrunWriteProductFlow.ql
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@@ -120,6 +120,10 @@ module ValidState {
predicate isBarrier(DataFlow::Node node, FlowState state) { none() }
predicate isBarrierOut(DataFlow::Node node) {
node = any(DataFlow::SsaPhiNode phi).getAnInput(true)
}
predicate isAdditionalFlowStep(
DataFlow::Node node1, FlowState state1, DataFlow::Node node2, FlowState state2
) {
@@ -233,7 +237,8 @@ module StringSizeConfig implements ProductFlow::StateConfigSig {
// we use `state2` to remember that there was an offset (in this case an offset of `1`) added
// to the size of the allocation. This state is then checked in `isSinkPair`.
exists(state1) and
hasSize(bufSource.asConvertedExpr(), sizeSource, state2)
hasSize(bufSource.asConvertedExpr(), sizeSource, state2) and
validState(sizeSource, state2)
}
predicate isSinkPair(