Add reflection_fuzzer covering the C++ reflection API - #9213
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The existing targets fuzz the parser, verifier, flexbuffers and the annotator (fixed schema). This adds a target for the reflection API itself, the documented path for consuming an untrusted schema plus untrusted data at runtime: VerifySchemaBuffer(schema) -> Verify(schema, root, data) -> CopyTable Input format: u32 schema_length | bfbs schema | flatbuffer data. Inputs failing either verification step return early, so the corpus converges on pairs that exercise the full consume path. reflection_debug follows the scalar_debug/monster_debug convention.
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The existing fuzz targets cover the parser, verifier, flexbuffers and the annotator (with a fixed schema), but not the reflection API itself:
reflection::VerifySchemaBuffer()→flatbuffers::Verify(schema, root, ...)→flatbuffers::CopyTable(), which is the documented path for consuming an untrusted schema together with untrusted data at runtime.This adds
reflection_fuzzerwith a simple two-part input:Inputs that fail either verification step return early, so the corpus converges on schema/data pairs that exercise the full consume path.
reflection_debugfollows the existingscalar_debug/monster_debugconvention for reproducing crash files locally.Verified locally with
-DUSE_ASAN=ON -DBUILD_DEBUGGER=ON. The OSS-Fuzz project build (projects/flatbuffers) builds all targets fromtests/fuzzer, so no oss-fuzz-side change is needed.