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Python: TarSlip sanitizer: handle not

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This commit is contained in:
Rasmus Wriedt Larsen
2020-02-20 16:27:54 +01:00
parent 3c317ed0e6
commit 1029f04e76
3 changed files with 11 additions and 10 deletions
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12
python/ql/src/Security/CWE-022/TarSlip.ql
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@@ -124,8 +124,16 @@ class TarFileInfoSanitizer extends Sanitizer {
/** The test `if <path_sanitizing_test>:` clears taint on its `false` edge. */
override predicate sanitizingEdge(TaintKind taint, PyEdgeRefinement test) {
taint instanceof TarFileInfo and
path_sanitizing_test(test.getTest()) and
test.getSense() = false
clears_taint_on_false_edge(test.getTest(), test.getSense())
}
private predicate clears_taint_on_false_edge(ControlFlowNode test, boolean sense) {
path_sanitizing_test(test) and
sense = false
or
// handle `not` (also nested)
test.(UnaryExprNode).getNode().getOp() instanceof Not and
clears_taint_on_false_edge(test.(UnaryExprNode).getOperand(), sense.booleanNot())
}
}