FuzzBench: fin-libfuzzer-p1-2 report

warning
Please consider this as a preliminary report to demonstrate the capabilities of FuzzBench. While we have tried our best, we have not confirmed that we configured everything correctly. We are hoping to work together with the community to validate results and improve the set of fuzzers, benchmarks, and their configurations in the future. See FAQ for more details.

experiment summary

We show two different aggregate (cross-benchmark) rankings of fuzzers. The first is based on the average of per-benchmarks scores, where the score represents the percentage of the highest reached median code-coverage on a given benchmark (higher value is better). The second ranking shows the average rank of fuzzers, after we rank them on each benchmark according to their median reached code-covereges (lower value is better).
By avg. score
average normalized score
fuzzer
sydr_libfuzzer 98.67
libfuzzer_two_workers 96.51
By avg. rank
average rank
fuzzer
sydr_libfuzzer 1.29
libfuzzer_two_workers 1.71
  • Critical difference diagram
    The diagram visualizes the average rank of fuzzers (second ranking above) while showing the significance of the differences as well. What is considered a "critical difference" (CD) is based on the Friedman/Nemenyi post-hoc test. See more in the documentation.
    Note: If a fuzzer does not support all benchmarks, its ranking as shown in this diagram can be lower than it should be. So please check the list of supported benchmarks for the fuzzer(s) of your interest. The list could be specified in the fuzzer's README.md like this.
  • Median relative code-coverages on each benchmark

    Note: The relative coverage summary table shows the median relative performance of each fuzzer to the experiment maximum. Thus the highest relative performance may not be 100%.
    trial_relative_coverage = trial_coverage / experiment_max_coverage

    sydr_libfuzzer libfuzzer_two_workers
    FuzzerMedian 93.85 93.51
    FuzzerMean 88.12 86.32
    lcms-2017-03-21 93.85 84.35
    libpng-1.2.56 95.74 93.51
    mbedtls_fuzz_dtlsclient 73.20 73.88
    openssl_x509 99.97 99.96
    openthread-2019-12-23 68.82 63.74
    sqlite3_ossfuzz 87.23 95.25
    woff2-2016-05-06 98.03 93.52
    • Fuzzers are sorted by "FuzzerMean" (average median relative coverage), highest on the left.
    • Green background = highest relative median coverage.
    • Blue gradient background = greater than 95% relative median coverage.

lcms-2017-03-21 summary

Ranking by median reached code coverage
Reached code coverage distribution
Mean code coverage growth over time
Mean code coverage growth over time
* The error bands show the 95% confidence interval around the mean code coverage.
  • Sample statistics and statistical significance (code coverage)
    Code coverage sample statistics
    count mean std min 25% median 75% max
    fuzzer time
    sydr_libfuzzer 82800 10.0 1764.1 178.187448 1429.0 1716.25 1832.0 1880.25 1952.0
    libfuzzer_two_workers 82800 10.0 1666.7 228.838638 1431.0 1464.00 1646.5 1874.50 1943.0

    Vargha-Delaney A12 measure
    The table summarizes the A12 values from the pairwise Vargha-Delaney A measure of effect size. Green cells indicate the probability the fuzzer in the row will outperform the fuzzer in the column.
    Mann-Whitney U test
    The table summarizes the p values of pairwise Mann-Whitney U tests. Green cells indicate that the reached coverage distribution of a given fuzzer pair is significantly different.
  • Unique code coverage plots
    Ranking by unique code branches covered
    Each bar shows the total number of code branches found by a given fuzzer. The colored area shows the number of unique code branches (i.e., branches that were not covered by any other fuzzers).
    Pairwise unique code coverage
    Each cell represents the number of code branches covered by the fuzzer of the column but not by the fuzzer of the row

libpng-1.2.56 summary

Ranking by median reached code coverage
Reached code coverage distribution
Mean code coverage growth over time
Mean code coverage growth over time
* The error bands show the 95% confidence interval around the mean code coverage.
  • Sample statistics and statistical significance (code coverage)
    Code coverage sample statistics
    count mean std min 25% median 75% max
    fuzzer time
    sydr_libfuzzer 82800 10.0 1057.5 23.467472 1027.0 1044.0 1055.0 1064.75 1102.0
    libfuzzer_two_workers 82800 10.0 1031.7 11.025727 1020.0 1022.0 1030.5 1040.25 1050.0

    Vargha-Delaney A12 measure
    The table summarizes the A12 values from the pairwise Vargha-Delaney A measure of effect size. Green cells indicate the probability the fuzzer in the row will outperform the fuzzer in the column.
    Mann-Whitney U test
    The table summarizes the p values of pairwise Mann-Whitney U tests. Green cells indicate that the reached coverage distribution of a given fuzzer pair is significantly different.
  • Unique code coverage plots
    Ranking by unique code branches covered
    Each bar shows the total number of code branches found by a given fuzzer. The colored area shows the number of unique code branches (i.e., branches that were not covered by any other fuzzers).
    Pairwise unique code coverage
    Each cell represents the number of code branches covered by the fuzzer of the column but not by the fuzzer of the row

mbedtls_fuzz_dtlsclient summary

Ranking by median reached code coverage
Reached code coverage distribution
Mean code coverage growth over time
Mean code coverage growth over time
* The error bands show the 95% confidence interval around the mean code coverage.
  • Sample statistics and statistical significance (code coverage)
    Code coverage sample statistics
    count mean std min 25% median 75% max
    fuzzer time
    libfuzzer_two_workers 82800 10.0 2705.2 340.105474 2521.0 2539.00 2548.0 2566.00 3449.0
    sydr_libfuzzer 82800 10.0 2583.4 177.570143 2504.0 2521.25 2524.5 2540.75 3087.0

    Vargha-Delaney A12 measure
    The table summarizes the A12 values from the pairwise Vargha-Delaney A measure of effect size. Green cells indicate the probability the fuzzer in the row will outperform the fuzzer in the column.
    Mann-Whitney U test
    The table summarizes the p values of pairwise Mann-Whitney U tests. Green cells indicate that the reached coverage distribution of a given fuzzer pair is significantly different.
  • Unique code coverage plots
    Ranking by unique code branches covered
    Each bar shows the total number of code branches found by a given fuzzer. The colored area shows the number of unique code branches (i.e., branches that were not covered by any other fuzzers).
    Pairwise unique code coverage
    Each cell represents the number of code branches covered by the fuzzer of the column but not by the fuzzer of the row

openssl_x509 summary

Ranking by median reached code coverage
Reached code coverage distribution
Mean code coverage growth over time
Mean code coverage growth over time
* The error bands show the 95% confidence interval around the mean code coverage.
  • Sample statistics and statistical significance (code coverage)
    Code coverage sample statistics
    count mean std min 25% median 75% max
    fuzzer time
    sydr_libfuzzer 82800 10.0 5849.6 1.074968 5847.0 5849.25 5850.0 5850.0 5851.0
    libfuzzer_two_workers 82800 10.0 5845.3 6.325434 5838.0 5838.00 5849.5 5850.0 5852.0

    Vargha-Delaney A12 measure
    The table summarizes the A12 values from the pairwise Vargha-Delaney A measure of effect size. Green cells indicate the probability the fuzzer in the row will outperform the fuzzer in the column.
    Mann-Whitney U test
    The table summarizes the p values of pairwise Mann-Whitney U tests. Green cells indicate that the reached coverage distribution of a given fuzzer pair is significantly different.
  • Unique code coverage plots
    Ranking by unique code branches covered
    Each bar shows the total number of code branches found by a given fuzzer. The colored area shows the number of unique code branches (i.e., branches that were not covered by any other fuzzers).
    Pairwise unique code coverage
    Each cell represents the number of code branches covered by the fuzzer of the column but not by the fuzzer of the row

openthread-2019-12-23 summary

Ranking by median reached code coverage
Reached code coverage distribution
Mean code coverage growth over time
Mean code coverage growth over time
* The error bands show the 95% confidence interval around the mean code coverage.
  • Sample statistics and statistical significance (code coverage)
    Code coverage sample statistics
    count mean std min 25% median 75% max
    fuzzer time
    sydr_libfuzzer 82800 10.0 2609.6 468.251879 2223.0 2262.25 2607.0 2611.0 3788.0
    libfuzzer_two_workers 82800 10.0 2412.0 201.356511 2206.0 2220.25 2414.5 2598.5 2634.0

    Vargha-Delaney A12 measure
    The table summarizes the A12 values from the pairwise Vargha-Delaney A measure of effect size. Green cells indicate the probability the fuzzer in the row will outperform the fuzzer in the column.
    Mann-Whitney U test
    The table summarizes the p values of pairwise Mann-Whitney U tests. Green cells indicate that the reached coverage distribution of a given fuzzer pair is significantly different.
  • Unique code coverage plots
    Ranking by unique code branches covered
    Each bar shows the total number of code branches found by a given fuzzer. The colored area shows the number of unique code branches (i.e., branches that were not covered by any other fuzzers).
    Pairwise unique code coverage
    Each cell represents the number of code branches covered by the fuzzer of the column but not by the fuzzer of the row

sqlite3_ossfuzz summary

Ranking by median reached code coverage
Reached code coverage distribution
Mean code coverage growth over time
Mean code coverage growth over time
* The error bands show the 95% confidence interval around the mean code coverage.
  • Sample statistics and statistical significance (code coverage)
    Code coverage sample statistics
    count mean std min 25% median 75% max
    fuzzer time
    libfuzzer_two_workers 82800 10.0 14722.8 445.036528 14062.0 14428.75 14774.5 14966.00 15512.0
    sydr_libfuzzer 82800 10.0 13607.0 588.448431 12818.0 13268.75 13531.5 13992.75 14511.0

    Vargha-Delaney A12 measure
    The table summarizes the A12 values from the pairwise Vargha-Delaney A measure of effect size. Green cells indicate the probability the fuzzer in the row will outperform the fuzzer in the column.
    Mann-Whitney U test
    The table summarizes the p values of pairwise Mann-Whitney U tests. Green cells indicate that the reached coverage distribution of a given fuzzer pair is significantly different.
  • Unique code coverage plots
    Ranking by unique code branches covered
    Each bar shows the total number of code branches found by a given fuzzer. The colored area shows the number of unique code branches (i.e., branches that were not covered by any other fuzzers).
    Pairwise unique code coverage
    Each cell represents the number of code branches covered by the fuzzer of the column but not by the fuzzer of the row

woff2-2016-05-06 summary

Ranking by median reached code coverage
Reached code coverage distribution
Mean code coverage growth over time
Mean code coverage growth over time
* The error bands show the 95% confidence interval around the mean code coverage.
  • Sample statistics and statistical significance (code coverage)
    Code coverage sample statistics
    count mean std min 25% median 75% max
    fuzzer time
    sydr_libfuzzer 82800 10.0 1144.2 10.952422 1129.0 1137.0 1143.0 1148.75 1166.0
    libfuzzer_two_workers 82800 10.0 1096.3 28.233353 1063.0 1079.0 1090.5 1110.25 1160.0

    Vargha-Delaney A12 measure
    The table summarizes the A12 values from the pairwise Vargha-Delaney A measure of effect size. Green cells indicate the probability the fuzzer in the row will outperform the fuzzer in the column.
    Mann-Whitney U test
    The table summarizes the p values of pairwise Mann-Whitney U tests. Green cells indicate that the reached coverage distribution of a given fuzzer pair is significantly different.
  • Unique code coverage plots
    Ranking by unique code branches covered
    Each bar shows the total number of code branches found by a given fuzzer. The colored area shows the number of unique code branches (i.e., branches that were not covered by any other fuzzers).
    Pairwise unique code coverage
    Each cell represents the number of code branches covered by the fuzzer of the column but not by the fuzzer of the row

experiment data

You can download the raw data for this report here.

Check out the documentation on how to create customized reports using this data. Also see some example Colab notebooks for doing custom analysis on the data here.

The experiment was conducted using this FuzzBench commit: 8c45eab091f06a293801b2c7be036b481ed4ef4d

To reproduce this experiment run the following commands in your FuzzBench repo:
# Check out the right commit.
git checkout 8c45eab091f06a293801b2c7be036b481ed4ef4d
# Download the internal config file.
curl https://storage.googleapis.com//data/fuzzbench/experiment-data/fin-libfuzzer-p1-2/input/config/experiment.yaml > /tmp/experiment-config.yaml
make install-dependencies
# Launch the experiment using paramters from the internal config file.
PYTHONPATH=. python experiment/reproduce_experiment.py -c /tmp/experiment-config.yaml -e <new_experiment_name>

Experiment Description:

(None,)