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Python: sync TypeTracker.qll

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Asger F
2022-09-29 15:57:09 +02:00
parent ae60b0ae6d
commit ed36f1983b
1 changed files with 23 additions and 4 deletions
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27
python/ql/lib/semmle/python/dataflow/new/internal/TypeTracker.qll
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@@ -12,8 +12,8 @@ private module Cached {
LevelStep() or LevelStep() or
CallStep() or CallStep() or
ReturnStep() or ReturnStep() or
StoreStep(TypeTrackerContent content) or StoreStep(TypeTrackerContent content) { basicStoreStep(_, _, content) } or
LoadStep(TypeTrackerContent content) or LoadStep(TypeTrackerContent content) { basicLoadStep(_, _, content) } or
JumpStep() JumpStep()
pragma[nomagic] pragma[nomagic]
@@ -218,7 +218,18 @@ module StepSummary {
} }
} }
private newtype TTypeTracker = MkTypeTracker(Boolean hasCall, OptionalTypeTrackerContent content) private newtype TTypeTracker =
MkTypeTracker(Boolean hasCall, OptionalTypeTrackerContent content) {
content = noContent()
or
// Restrict `content` to those that might eventually match a load.
// We can't rely on `basicStoreStep` since `startInContent` might be used with
// a content that has no corresponding store.
exists(TypeTrackerContent loadContents |
basicLoadStep(_, _, loadContents) and
compatibleContents(content, loadContents)
)
}
/** /**
* A summary of the steps needed to track a value to a given dataflow node. * A summary of the steps needed to track a value to a given dataflow node.
@@ -372,7 +383,15 @@ module TypeTracker {
} }
private newtype TTypeBackTracker = private newtype TTypeBackTracker =
MkTypeBackTracker(Boolean hasReturn, OptionalTypeTrackerContent content) MkTypeBackTracker(Boolean hasReturn, OptionalTypeTrackerContent content) {
content = noContent()
or
// As in MkTypeTracker, restrict `content` to those that might eventually match a store.
exists(TypeTrackerContent storeContent |
basicStoreStep(_, _, storeContent) and
compatibleContents(storeContent, content)
)
}
/** /**
* A summary of the steps needed to back-track a use of a value to a given dataflow node. * A summary of the steps needed to back-track a use of a value to a given dataflow node.