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Performance vulnerability in dname compression #173

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vzuevsky opened this issue Apr 18, 2022 · 0 comments · May be fixed by #174
Open

Performance vulnerability in dname compression #173

vzuevsky opened this issue Apr 18, 2022 · 0 comments · May be fixed by #174

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@vzuevsky
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We saw some automated NSEC walks were degrading performance of our HW fleet. Based on that, I had designed an exploit that exacerbated the impact. Both scenaria employ query packets with the maximal number of labels:

Screenshot 2022-04-18 at 17 59 34

I profiled software performance under degradation and observed the culprit, that happens be LDNS wire compression algorithm as per this flame chart:

flame

I have now redesigned that algorithm and would like to contribute with a patch. I have also added a doc file explaining the proposed fix.
@vzuevsky vzuevsky linked a pull request Apr 18, 2022 that will close this issue
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Fixes #173 ns1/ldns
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@vzuevsky