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support nested stars in js/ReDoS

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Erik Krogh Kristensen
2020-12-04 20:58:09 +01:00
parent 77967c3e63
commit 3d98732136
3 changed files with 32 additions and 6 deletions
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15
javascript/ql/src/Performance/ReDoS.ql
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@@ -172,6 +172,21 @@ predicate isFork(State q, InputSymbol s1, InputSymbol s2, State r1, State r2) {
r1 != r2
or
r1 = r2 and q1 != q2
or
r1 = r2 and
q1 = q2 and
epsilonSucc+(q) = q and
exists(RegExpTerm term | term = q.getRepr() | term instanceof InfiniteRepetitionQuantifier) and
(
// One of the mid states is an infinite quantifier itself
exists(State mid, RegExpTerm term |
mid = epsilonSucc+(q) and
term = mid.getRepr() and
term instanceof InfiniteRepetitionQuantifier and
q = epsilonSucc+(mid) and
not mid = q
)
)
) and
stateInsideBacktracking(r1) and
stateInsideBacktracking(r2)