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tests: extend fuzz parser coverage - #2537

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michalvasko merged 1 commit into
CESNET:develfrom
BeaCox:fuzz-lyb-schema-mount
Jul 3, 2026
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tests: extend fuzz parser coverage#2537
michalvasko merged 1 commit into
CESNET:develfrom
BeaCox:fuzz-lyb-schema-mount

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@BeaCox

@BeaCox BeaCox commented Jul 2, 2026

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Summary:

  • add a LYB data parser fuzz target that preserves binary input length via fd-backed parsing
  • add a schema-mount XML data parser fuzz target with runtime extension data and a non-crashing seed
  • allow fuzz targets to build without the unit-test/CMocka dependency and make LibFuzzer targets link sanitizer runtimes correctly
  • avoid terminating the fuzzer process from existing harness setup/allocation failures

Testing:

  • cmake -S . -B build-fuzz-check -G Ninja -DENABLE_TESTS=OFF -DENABLE_FUZZ_TARGETS=ON -DFUZZER=AFL -DCMAKE_BUILD_TYPE=Debug
  • cmake --build build-fuzz-check --target lys_parse_mem_fuzz_harness lyd_parse_mem_xml_fuzz_harness lyd_parse_mem_json_fuzz_harness yang_parse_module_fuzz_harness lyd_parse_lyb_fuzz_harness lyd_parse_schema_mount_xml_fuzz_harness -j2
  • ./build-fuzz-check/lyd_parse_schema_mount_xml_fuzz_harness < tests/fuzz/corpus/lyd_parse_schema_mount_xml/valid-mounted-leaf
  • cmake -S . -B build-fuzz-libfuzzer -G Ninja -DENABLE_TESTS=OFF -DENABLE_FUZZ_TARGETS=ON -DFUZZER=LibFuzzer -DCMAKE_C_COMPILER=clang -DCMAKE_BUILD_TYPE=Release
  • cmake --build build-fuzz-libfuzzer --target lyd_parse_lyb_fuzz_harness lyd_parse_schema_mount_xml_fuzz_harness -j2
  • ASAN_OPTIONS=detect_leaks=0 ./build-fuzz-libfuzzer/lyd_parse_schema_mount_xml_fuzz_harness -runs=1 tests/fuzz/corpus/lyd_parse_schema_mount_xml/valid-mounted-leaf

@michalvasko
michalvasko merged commit b3404d2 into CESNET:devel Jul 3, 2026
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@michalvasko

michalvasko commented Jul 3, 2026

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Okay, no problem, thanks.

@BeaCox BeaCox mentioned this pull request Jul 3, 2026
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DavidKorczynski pushed a commit to google/oss-fuzz that referenced this pull request Jul 9, 2026
@BeaCox BeaCox
libyang: build all upstream fuzz targets (#15837)
222bde7 
Summary:
- build every fuzz target available in upstream libyang after
CESNET/libyang#2537
- add the new LYB and schema-mount XML fuzz targets to OSS-Fuzz
- package upstream per-target fuzz regression corpora as OSS-Fuzz seed
corpora when present

Testing:
- bash -n projects/libyang/build.sh
- git diff --check
- python3 infra/helper.py build_fuzzers --sanitizer address libyang was
started locally; Docker dependency installation completed, but the image
build stalled while cloning CESNET/libyang and was interrupted before
completion.

Co-authored-by: BeaCox <0xbeac@gmail.com>
moohamedsalim88-cpu
moohamedsalim88-cpu reviewed Jul 10, 2026
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MSS

@moohamedsalim88-cpu

moohamedsalim88-cpu commented Jul 10, 2026

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MSS

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