fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}#1432
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fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}#1432vfsci-bot[bot] wants to merge 1 commit into
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…tion} In do_action()'s UpdateRecordDataRoot (fslog.c:3489) and UpdateRecordDataAllocation (fslog.c:3697) cases, the memmove destination is `Add2Ptr(e, le16_to_cpu(e->view.data_off))`, where e->view.data_off comes from an on-disk NTFS_DE inside an INDEX_ROOT or INDEX_BUFFER. Neither case validates view.data_off + dlen against e->size; the existing check_if_index_root / check_if_alloc_index helpers walk the entry chain and validate the entry's offset, but not its internal view fields. The neighbouring read sites (e.g., fs/ntfs3/index.c when iterating view entries) check view.data_off + view.data_size <= e->size. Apply the same bound at the two memmove sites. Reproduced under UML+KASAN on mainline 8d90b09e6741 via pr_warn-only probe instrumentation: with view.data_off forced to 0xFFFC, the memmove writes 32 bytes past the end of the NTFS_DE. This is similar in shape to Pavitra Jha's 2026-05-02 patch "fs/ntfs3: prevent oob in case UpdateRecordDataRoot" (<20260502105008.21827-1-jhapavitra98@gmail.com>) which proposes calling ntfs3_bad_de_range(); that helper does not exist in mainline. This patch uses inline checks. Fixes: b46acd6 ("fs/ntfs3: Add NTFS journal") Cc: stable@vger.kernel.org Reported-by: Pavitra Jha <jhapavitra98@gmail.com> Closes: https://lore.kernel.org/ntfs3/20260502105008.21827-1-jhapavitra98@gmail.com/ Assisted-by: Claude:claude-opus-4-7 Signed-off-by: Michael Bommarito <michael.bommarito@gmail.com>
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Series: https://patchwork.kernel.org/project/linux-fsdevel/list/?series=1097228
Submitter: Michael Bommarito
Version: 2
Patches: 1/1
Message-ID:
<20260519095135.1609973-1-michael.bommarito@gmail.com>Base: vfs.base.ci
Lore: https://lore.kernel.org/linux-fsdevel/20260519095135.1609973-1-michael.bommarito@gmail.com
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