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Shared: Improvements to content-sensitive model generation

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This commit is contained in:
Tom Hvitved
2025-11-26 10:33:52 +01:00
parent 464d2cd5fc
commit 666855dbd7
3 changed files with 29 additions and 17 deletions
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15
shared/dataflow/codeql/dataflow/internal/ContentDataFlowImpl.qll
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@@ -75,6 +75,9 @@ module MakeImplContentDataFlow<LocationSig Location, InputSig<Location> Lang> {
/** Gets a limit on the number of reads out of sources and number of stores into sinks. */
default int accessPathLimit() { result = Lang::accessPathLimit() }
/** Gets the access path limit used in the internal invocation of the standard data flow library. */
default int accessPathLimitInternal() { result = Lang::accessPathLimit() }
/** Holds if `c` is relevant for reads out of sources or stores into sinks. */
default predicate isRelevantContent(ContentSet c) { any() }
}
@@ -110,7 +113,7 @@ module MakeImplContentDataFlow<LocationSig Location, InputSig<Location> Lang> {
FlowFeature getAFeature() { result = ContentConfig::getAFeature() }
predicate accessPathLimit = ContentConfig::accessPathLimit/0;
predicate accessPathLimit = ContentConfig::accessPathLimitInternal/0;
// needed to record reads/stores inside summarized callables
predicate includeHiddenNodes() { any() }
@@ -274,6 +277,16 @@ module MakeImplContentDataFlow<LocationSig Location, InputSig<Location> Lang> {
)
}
/**
* Gets the length of this access path.
*/
int length() {
this = TAccessPathNil() and
result = 0
or
result = this.getTail().length() + 1
}
/**
* Gets the content set at index `i` in this access path, if any.
*/

23
shared/mad/codeql/mad/modelgenerator/internal/ModelGeneratorImpl.qll
View File

@@ -703,14 +703,17 @@ module MakeModelGeneratorFactory<
}
/**
* Holds if the access path `ap` is not a parameter or returnvalue of a callback
* stored in a field.
* Holds if `ap` is valid for generating summary models.
*
* That is, we currently don't include summaries that rely on parameters or return values
* of callbacks stored in fields.
* We currently don't include summaries that rely on parameters or return values
* of callbacks stored in fields, as those are not supported by the data flow
* library.
*
* We also exclude access paths with contents not supported by `printContent`.
*/
private predicate validateAccessPath(PropagateContentFlow::AccessPath ap) {
not (mentionsField(ap) and mentionsCallback(ap))
not (mentionsField(ap) and mentionsCallback(ap)) and
forall(int i | i in [0 .. ap.length() - 1] | exists(getContent(ap, i)))
}
private predicate apiFlow(
@@ -720,7 +723,9 @@ module MakeModelGeneratorFactory<
) {
PropagateContentFlow::flow(p, reads, returnNodeExt, stores, preservesValue) and
getEnclosingCallable(returnNodeExt) = api and
getEnclosingCallable(p) = api
getEnclosingCallable(p) = api and
validateAccessPath(reads) and
validateAccessPath(stores)
}
/**
@@ -763,9 +768,7 @@ module MakeModelGeneratorFactory<
PropagateContentFlow::AccessPath reads, ReturnNodeExt returnNodeExt,
PropagateContentFlow::AccessPath stores, boolean preservesValue
) {
PropagateContentFlow::flow(p, reads, returnNodeExt, stores, preservesValue) and
getEnclosingCallable(returnNodeExt) = api and
getEnclosingCallable(p) = api and
apiFlow(api, p, reads, returnNodeExt, stores, preservesValue) and
p = api.getARelevantParameterNode()
}
@@ -956,8 +959,6 @@ module MakeModelGeneratorFactory<
input = parameterNodeAsExactInput(p) + printReadAccessPath(reads) and
output = getExactOutput(returnNodeExt) + printStoreAccessPath(stores) and
input != output and
validateAccessPath(reads) and
validateAccessPath(stores) and
(
if mentionsField(reads) or mentionsField(stores)
then lift = false and api.isRelevant()