87d3138158
This reverts commit f58f69f66bacefb0aaf78e91b462b5db97cea391. Reason for revert: This breaks the MSVC build because the whitebox end2end tests try to both import and export the error injector symbols from libdawn_native Original change's description: > fuzzing: Add supportsErrorInjection option to DawnWireServerFuzzer > > This option will be used by backends that support error injection so > that errors can be injected into a "clean" corpus to generate a seed > corpus with good examples of injected error conditions. > > Bug: dawn:295 > Change-Id: I837acdde6dd4274adb56edf8e4307427f8d6333b > Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/14681 > Reviewed-by: Corentin Wallez <cwallez@chromium.org> > Commit-Queue: Austin Eng <enga@chromium.org> TBR=cwallez@chromium.org,kainino@chromium.org,enga@chromium.org Change-Id: I14a15fcd094d431cbb8a29d5642a4a7fe6a11f4c No-Presubmit: true No-Tree-Checks: true No-Try: true Bug: dawn:295 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/14741 Reviewed-by: Austin Eng <enga@chromium.org> Commit-Queue: Austin Eng <enga@chromium.org>
1.5 KiB
Fuzzing Dawn
dawn_wire_server_and_frontend_fuzzer
The dawn_wire_server_and_frontend_fuzzer sets up Dawn using the Null backend, and passes inputs to the wire server. This fuzzes the dawn_wire deserialization, as well as Dawn's frontend validation.
Updating the Seed Corpus
Using a seed corpus significantly improves the efficiency of fuzzing. Dawn's fuzzers use interesting testcases discovered in previous fuzzing runs to seed future runs. Fuzzing can be further improved by using Dawn tests as a example of API usage which allows the fuzzer to quickly discover and use new API entrypoints and usage patterns.
The script update_fuzzer_seed_corpus.sh can be used to capture a trace while running Dawn tests, and upload it to the existing fuzzzer seed corpus.
To run the script:
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Make sure gcloud is installed: https://g3doc.corp.google.com/cloud/sdk/g3doc/index.md?cl=head
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Login with @google.com credentials:
gcloud auth login -
You must be in a Chromium checkout using the GN arg
use_libfuzzer=true -
Run
./third_party/dawn/scripts/update_fuzzer_seed_corpus.sh <out_dir> <fuzzer> <test>.Example:
./third_party/dawn/scripts/update_fuzzer_seed_corpus.sh out/fuzz dawn_wire_server_and_frontend_fuzzer dawn_end2end_tests -
The script will print instructions for testing, and then uploading new inputs. Please, only upload inputs after testing the fuzzer with new inputs, and verifying there is a meaningful change in coverage.