Elaborate how cd_values get stored #2522
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* Elaborate how cd_values get stored (#2522) * Enclose MESG in do...while loop (#2576) Enclose MSG macro in a do...while loop * Add a clang-format comment about permissions (#2577) * Check for overflow when calculating on-disk attribute data size (#2459) * Remove duplicate code Signed-off-by: Egbert Eich <eich@suse.com> * Add test case for CVE-2021-37501 Bogus sizes in this test case causes the on-disk data size calculation in H5O__attr_decode() to overflow so that the calculated size becomes 0. This causes the read to overflow and h5dump to segfault. This test case was crafted, the test file was not directly generated by HDF5. Test case from: https://github.com/ST4RF4LL/Something_Found/blob/main/HDF5_v1.13.0_h5dump_heap_overflow.md --------- Co-authored-by: Mark (he/his) C. Miller <miller86@llnl.gov> Co-authored-by: glennsong09 <43005495+glennsong09@users.noreply.github.com> Co-authored-by: Dana Robinson <43805+derobins@users.noreply.github.com> Co-authored-by: Egbert Eich <eich@suse.com>
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Just a minor adjustment to documentation to elaborate how filter
cd_valueswind up getting possibly modified before they are stored as part of a data object header.