memfd_luo 修 exec 位与泄漏 · v2

[mm/memfd_luo: carry the sealed exec-bit state in the preserved record] F_SEAL_EXEC freezes the execute bits as they are at sealing time: a memfd becomes permanently executable or permanently un-execu

[mm/memfd_luo: release preserved folios when retrieve fails] retrieve() only frees the serialization structure on its error paths, but the folios it describes are still preserved at that point: memfd_