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This adds a script which runs the end2end_tests, captures a wire trace, and then minimizes the corpus with the fuzzer. Minimizing the corpus requires libfuzzer, so this only works in a Chromium checkout. Unseeded, the fuzzer starts with coverage of about 600 features. Using a seed corpus captured from the tests, the fuzzer quickly increases coverage to about 10,000 features. Change-Id: I8d0db5121745bd5ee4a350cf46fb37cfa434e3dc Bug: dawn:295 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/14242 Commit-Queue: Austin Eng <enga@chromium.org> Reviewed-by: Kai Ninomiya <kainino@chromium.org>
88 lines
2.3 KiB
Bash
Executable File
88 lines
2.3 KiB
Bash
Executable File
#!/bin/bash
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# Copyright 2019 The Dawn Authors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# Generates a seed corpus for fuzzing based on dumping wire traces
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# from running Dawn tests
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# Exit if anything fails
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set -e
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if [ "$#" -ne 3 ]; then
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cat << EOF
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Usage:
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$0 <out_dir> <fuzzer_name> <test_name>
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Example:
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$0 out/fuzz dawn_wire_server_and_frontend_fuzzer dawn_end2end_tests
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EOF
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exit 1
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fi
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out_dir=$1
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fuzzer_name=$2
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test_name=$3
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testcase_dir="/tmp/testcases/${fuzzer_name}/"
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minimized_testcase_dir="/tmp/testcases/${fuzzer_name}_minimized/"
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# Make a directory for temporarily storing testcases
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mkdir -p "$testcase_dir"
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# Make an empty directory for temporarily storing minimized testcases
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rm -rf "$minimized_testcase_dir"
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mkdir -p "$minimized_testcase_dir"
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# Download the existing corpus. First argument is src, second is dst.
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gsutil -m rsync gs://clusterfuzz-corpus/libfuzzer/${fuzzer_name}/ "$testcase_dir"
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# Build the fuzzer and test
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autoninja -C $out_dir $fuzzer_name $test_name
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fuzzer_binary="${out_dir}/${fuzzer_name}"
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test_binary="${out_dir}/${test_name}"
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# Run the test binary
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$test_binary --use-wire --wire-trace-dir="$testcase_dir"
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# Run the fuzzer to minimize the corpus
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$fuzzer_binary -merge=1 "$minimized_testcase_dir" "$testcase_dir"
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if [ -z "$(ls -A $minimized_testcase_dir)" ]; then
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cat << EOF
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Minimized testcase directory is empty!
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Are you building with use_libfuzzer=true ?
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EOF
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exit 1
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fi
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cat << EOF
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Please test the corpus in $minimized_testcase_dir with $fuzzer_name and confirm it works as expected.
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$fuzzer_binary $minimized_testcase_dir
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Then, run the following command to upload new testcases to the seed corpus:
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gsutil -m rsync $minimized_testcase_dir gs://clusterfuzz-corpus/libfuzzer/${fuzzer_name}/
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WARNING: Add [-d] argument to delete all GCS files that are not also in $minimized_testcase_dir
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EOF
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