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ReDoS: Improve performance in ExponentialBackTracking.qll. #9381

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Merged
merged 2 commits into from
Jun 1, 2022
Merged

ReDoS: Improve performance in ExponentialBackTracking.qll. #9381

merged 2 commits into from
Jun 1, 2022
+96 −84

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aschackmull
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Two perf fixes:

  1. Magic the shortestDistances HOP.
  2. Fix the join-order in isReachableFromFork.

@aschackmull aschackmull marked this pull request as ready for review May 31, 2022 09:08
@aschackmull aschackmull requested review from a team as code owners May 31, 2022 09:08
@aschackmull aschackmull added the no-change-note-required This PR does not need a change note label May 31, 2022
@aschackmull aschackmull requested a review from erik-krogh May 31, 2022 09:08
erik-krogh
erik-krogh approved these changes May 31, 2022
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@erik-krogh erik-krogh left a comment •
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👍

Assuming the tests pass and the evaluations work out (did you start any?).

Maybe I should rewrite the base-case to start at Nil() in the poly-redos query, it looks better 🤔

@aschackmull
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Assuming the tests pass and the evaluations work out (did you start any?).

You should see them now.

@erik-krogh erik-krogh mentioned this pull request May 31, 2022
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You should see them now.

They all look OK.
There is a performance regression in the Java evaluation, but I expect that to be a fluke.
(DB caching in DCA 🤞)

@aschackmull aschackmull merged commit 9abd225 into github:main Jun 1, 2022
@aschackmull aschackmull deleted the redos/perf branch June 1, 2022 08:39
@erik-krogh erik-krogh mentioned this pull request Jun 2, 2022
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