Dylan M. TaylorandCodebuff 6fac430f55 M2.9: cap xlsx import work and gate hostile datetime field lengths (#2413) ...

Security-sweep findings from the scan at revision ac8da7d4 (storytold-
gridcraft-agent-findings.json), no longer exploitable on main at 72c1d57d.
Each change caps work or storage per sheet/part so a hostile file cannot buy
unbounded work with ordinary bytes; each has a regression test:

- finding 2 (package.rs): a part rejected by the MAX_PART size gate is
  charged its declared compressed size up front, so a loop of oversized
  parts still ends the allowance instead of re-entering the package.
- finding 4 (xml.rs): elements past the kept-node cap are consumed and
  dropped instead of kept — parse cost stays linear, memory stops growing
  with the same input (a small compressed workbook previously asked for
  gigabytes of declared-sized metadata tree).
- finding 10 (records.rs): .remaining() caches the suffix of a shared
  string's Continue parts, so crossing N Continue records is O(N) instead
  of O(N^2) in records scanned per character.
- finding 9 (xls shared formulas): the SHRFMLA master template is parsed
  once and re-emitted per dependent cell instead of decoded and reprinted
  for every referencing cell.
- findings 3, 6, 8 (sheet_read.rs): hyperlink-cell expansion, conditional-
  format kept range cells and dynamic-array (deleted-spill) checks are
  capped with one import warning each instead of the compact-workbook
  multi-gigabyte allocation or the scanned-per-cell cost.
- finding 31 (core/parse.rs): datetime recognition no longer reparses a
  prefix at every space with a time-shaped tail; an all-digit field length
  is gated before the derivation machinery runs, staying linear in the
  text.

🤖 Generated with Codebuff

Co-authored-by: Codebuff <noreply@codebuff.com>

2026-10-24 05:46:28 -04:00

..

src

M2.9: cap xlsx import work and gate hostile datetime field lengths (#2413)

2026-10-24 05:46:28 -04:00

Cargo.toml

Use chrono instead of hand-rolled UTC conversion (#2121)

2026-10-23 11:48:02 -04:00