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Merge pull request #12543 from erik-krogh/reg-perf

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ReDoS: restrict the edges considered in polynomial-redos for complex regular expressions
This commit is contained in:
Erik Krogh Kristensen
2023-03-20 15:48:35 +01:00
committed by GitHub
parent c56c1cbb62 2270d6fa61
commit 0f813ce2e8
5 changed files with 72 additions and 39 deletions
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6
python/ql/lib/semmle/python/regex.qll
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@@ -140,7 +140,11 @@ string mode_from_node(DataFlow::Node node) { node = re_flag_tracker(result) }
/** A StrConst used as a regular expression */
abstract class RegexString extends Expr {
RegexString() { (this instanceof Bytes or this instanceof Unicode) }
RegexString() {
(this instanceof Bytes or this instanceof Unicode) and
// is part of the user code
exists(this.getLocation().getFile().getRelativePath())
}
/**
* Helper predicate for `char_set_start(int start, int end)`.