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Python: Move helper predicate outside of class

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otherwise the helper predicate can (and sometimes will) be evaluated once _per_
instance of that class.
This commit is contained in:
Rasmus Wriedt Larsen
2020-03-30 18:31:16 +02:00
parent 663dc24753
commit fad03e77cc
1 changed files with 24 additions and 24 deletions
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48
python/ql/test/library-tests/examples/custom-sanitizer/Taint.qll
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@@ -35,32 +35,32 @@ class MySanitizerHandlingNot extends Sanitizer {
taint instanceof ExternalStringKind and
clears_taint_on_true(test.getTest(), test.getSense(), test)
}
}
/**
* Helper predicate that recurses into any nesting of `not`
*
* To reduce the number of tuples this predicate holds for, we include the `PyEdgeRefinement` and
* ensure that `test` is a part of this `PyEdgeRefinement` (instead of just taking the
* `edge_refinement.getInput().getAUse()` part as a part of the predicate). Without including
* `PyEdgeRefinement` as an argument *any* `CallNode c` to `test.is_safe` would be a result of
* this predicate, since the tuple where `test = c` and `sense = true` would hold.
*/
private predicate clears_taint_on_true(
ControlFlowNode test, boolean sense, PyEdgeRefinement edge_refinement
) {
edge_refinement.getTest().getNode().(Expr).getASubExpression*() = test.getNode() and
(
test = Value::named("test.is_safe").getACall() and
edge_refinement.getInput().getAUse() = test.(CallNode).getAnArg() and
sense = true
or
test.(UnaryExprNode).getNode().getOp() instanceof Not and
exists(ControlFlowNode nested_test |
nested_test = test.(UnaryExprNode).getOperand() and
clears_taint_on_true(nested_test, sense.booleanNot(), edge_refinement)
)
/**
* Helper predicate that recurses into any nesting of `not`
*
* To reduce the number of tuples this predicate holds for, we include the `PyEdgeRefinement` and
* ensure that `test` is a part of this `PyEdgeRefinement` (instead of just taking the
* `edge_refinement.getInput().getAUse()` part as a part of the predicate). Without including
* `PyEdgeRefinement` as an argument *any* `CallNode c` to `test.is_safe` would be a result of
* this predicate, since the tuple where `test = c` and `sense = true` would hold.
*/
private predicate clears_taint_on_true(
ControlFlowNode test, boolean sense, PyEdgeRefinement edge_refinement
) {
edge_refinement.getTest().getNode().(Expr).getASubExpression*() = test.getNode() and
(
test = Value::named("test.is_safe").getACall() and
edge_refinement.getInput().getAUse() = test.(CallNode).getAnArg() and
sense = true
or
test.(UnaryExprNode).getNode().getOp() instanceof Not and
exists(ControlFlowNode nested_test |
nested_test = test.(UnaryExprNode).getOperand() and
clears_taint_on_true(nested_test, sense.booleanNot(), edge_refinement)
)
}
)
}
class TestConfig extends TaintTracking::Configuration {