fuzz: add fuzz_jp2_metadata for JP2 container header and box parsing#1639
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fuzz: add fuzz_jp2_metadata for JP2 container header and box parsing#1639XananasX7 wants to merge 1 commit into
XananasX7 wants to merge 1 commit into
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Add a libFuzzer harness targeting opj_read_header() which parses JP2 container boxes (JP2H, COLR, PCLR, CMAP, CDEF, RES, XML, UUID, etc.) and embedded metadata (XMP, ICC profiles) without decoding the full codestream. The existing fuzzers focus on full image decoding; this harness targets the metadata/header parsing path which processes variable-length boxes of arbitrary type and can be reached even with truncated or malformed JP2 files that fail codestream decoding.
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Summary
Adds a new libFuzzer harness targeting the JP2 container box/metadata parsing path in openjpeg.
New fuzzer:
tests/fuzzers/fuzz_jp2_metadata.cWhat it exercises:
opj_read_header()— parses JP2 box structure (JP2H, COLR, PCLR, CMAP, CDEF, RES, XML, UUID boxes)Why this matters:
The existing fuzzers in
tests/fuzzers/focus on full image decoding. The JP2 container parsing code insrc/lib/openjp2/jp2.cprocesses variable-length boxes of arbitrary type and length, reading embedded strings, binary color profiles, and palette data. A malformed JP2 file with adversarial box lengths could trigger out-of-bounds reads before the codestream decoder is ever invoked.Build: integrates with the existing
build_google_oss_fuzzers.shscript.