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fix: review pass — uninit stats, append crash, filter rollback, ASan leak 
Address findings from the four-agent review of PR #298:

- file_create: zero the new File.matched_bytes.  It was uninitialized
  malloc memory, so the receiver could sum a garbage value into
  STATUS_STATS "Matched data" (nondeterministic --stats divergence and
  an uninitialized-heap disclosure on the wire).
- send_append: load the source into memory before hashing/copying the
  prefix and tail.  Files >64 MiB without compression (and --sendfile
  runs) are streamed without loading, so --append/--append-verify
  dereferenced a NULL data->data and crashed.
- filter_file_append: clamp the rollback to the surviving rule count.
  A "clear" rule in a merge file frees every rule including the
  caller's; the old rollback rewound count to rules_before and
  resurrected freed pointers for a double free / UAF.  Also roll back
  when set_rule_owner fails instead of leaving owner-less rules.
- filter_rule_parse: reject the xattr-name filter modifier (x), which
  was parsed and silently reinterpreted as a filename rule (affecting
  what --delete protects).  The p modifier stays accepted (existing
  grammar test).
- Remove two dead functions: compression_default_algo and
  change_render_itemize_code.
- tests: free ctx->would_delete in the two test_multiprocessing manual
  teardowns (ASan leak, 1648 bytes/run).
- docs: correct the RSYNC_COMPAT/HANDOFF tally (156 rows: 106/27/23),
  downgrade --info/--debug to caveat with their silent categories, add
  %C-vs-xxh64 and --delete-delay count caveats, refresh stale xattr
  mode comments, and document -p special-bit (setuid/setgid/sticky)
  parity plus its mitigations.
2026-09-17 20:30:15 +02:00

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FastSync — Session Handoff (2026-09-17)

Current status

  • Release v2.21.0 tagged (919a729, "Release v2.21.0"); full CI green (run 552: lint, build-and-test, ASan, UBSan, fuzz-build, coverage, valgrind). dev has the release commit plus later doc-only merges (a README refresh and this handoff).
  • Release PR #284 (dev -> main) open, CI green (run 553). main is protected: it needs review/approval to merge. #284
  • PROTOCOL_VERSION = "2.26.0" (src/shared/config.h); CMake project(FastFileTransfer VERSION 2.26.0).
  • Working tree clean; no wave worktrees remain.

What landed this session

  1. Wave 8 (refactors): Config X-macro wire table; single-owner authorized_root; daemon per-module/per-host caps + cross-process auth lockout (daemon_limits.[ch]); Data charge returns to its owning ProtocolSession.
  2. Wave 9 (protocol 2.21.0): optional STATUS_ERROR_DETAIL rejection reasons; server-contacting --dry-run (STATUS_DRY_RUN_TRANSFER, receiver mutates nothing).
  3. Security wave: ran 5 parallel audits (wire parsing; daemon/transport/TLS/auth; receiver confinement; client/CLI/SSH; crypto/memory/limits). Fixed all HIGH and the confirmed MEDIUMs:
    • SSH -o ProxyCommand=… argument injection (RCE) — reject leading -, insert --.
    • Truncated zstd frame infinite CPU loop (remote DoS).
    • FIFO receiver opens lacked O_NONBLOCK (indefinite hang).
    • --inplace could write a FIFO/device (bypass of --write-devices gate).
    • --force not gated by server --allow-delete.
    • Privileged standalone server defaulted super activities on; added --allow-super (never honored with --stdio).
    • --dry-run content/hash oracle on read only/basis files removed.
    • Empty hosts allow/deny/auth users now rejected.
    • TLS: AEAD-only 1.2 + server preference, TOCTOU-safe key load, IP-SAN verify, CN-truncation guard. Glob backtracking bounded; line reads bounded; ACL xattrs gated on --acls; decompression/chunk memory charged; pre-auth basis_count NULL-deref fixed.
  4. Tooling: benchmark accuracy (data mix, verification, percentiles, tc, build-bench/, --warm mode); shell.nix full toolchain and no build-on-entry; docs state push-only / remote-source unsupported.
  5. Preserve-attribute split (protocol 2.22.0) landed on feat/preserve-attr-split: per-attribute -p/-t/-o/-g + --no-* negations, -a = -rlptgoD, and the 2.21.0 → 2.22.0 wire bump.
  6. Rsync-parity wave (protocol 2.23.0) on feat/rsync-parity: rsync short options/clustering/attached values (-r/-b/-L/-B, -av, -aAX, -B1000, -essh, -MOPT), -c checksum quick-check, --checksum-choice/--compress-choice validation and seed randomization, rsync timeout/max-alloc defaults, temp-dir confinement + EXDEV fallback, ownership/mapping parity (numeric-ids modifier, map ranges/*/empty-FROM, --chown+map conflicts, fake-super resolved-owner record), verbatim symlink storage with rsync --safe-links/--munge-links, socket recreation under --specials, --chmod 3.4.1 semantics, and delete scoping + --max-delete partial/exit-25. Wire: appended delete-manifest synchronized-directory section and STATUS_DELETE_LIMIT.
  7. Parity-completion wave (protocol 2.24.0 → 2.26.0) on feat/parity-completion: per-directory delete plans (STATUS_DELETE_PLAN) for --delete-during/--delete-delay; receiver STATUS_STATS counters feeding --stats/--progress and --out-format %b/%c/%C, plus -n --delete lines; lz4/zlib/zlibx compression and md4/sha1/none checksums with auto negotiation (default xxh128/zstd); general -R/--no-implied-dirs/-d; the full filter grammar (merge/dir-merge/hide/show/protect/risk/clear + modifiers) and corrected -F/-FF; receiver-side --chown/map TO-name resolution; absolute basis dirs + --link-dest relink; receiver-side --ignore-existing short-circuit; --preallocate over --sparse via fallocate(2); --iconv=./-/--no-iconv; lone -h help; aliases --ignore-non-existing/--protect-args/--msgs2stderr; and the full --info/--debug vocabulary. RSYNC_COMPAT.md reclassifies the matrix to 106 ✅ / 27 ⚠️ / 23 ❌.

Next steps

  1. Merge PR #284 (dev -> main) once reviewed (protected branch).
  2. Deferred security items (documented, not implemented):
    • Pre-auth config/daemon-auth handshake has no aggregate wall-clock deadline (per-message timeout only) — slowloris holds connection slots.
    • Per-source registry fails open when the shared table is full (per-module/global caps and host ACLs still apply); consider fail-closed or larger/evicting table.
    • SCRAM-like daemon auth has no TLS channel binding (and is not RFC 5802).
    • cleanup() signal handler calls non-async-signal-safe teardown; daemon umask(0).
    • Wire protocol assumes homogeneous word size/endianness (lengths are native size_t) — document or move to fixed-width framing.
  3. Out of scope / intentional: pull (remote source) mode is not planned — FastSync is push-only; see RSYNC_COMPAT.md#direction.

Key facts / commands

  • CI image: gitea.tap-tap.win/taptap/fastsync-ci:v11 (alias fastsync-ci:local).
  • Build/test: cmake -B build -S . -DSTRICT_WARNINGS=ON && cmake --build build -j$(nproc) && ./build/tests then python3 -m pytest tests/integration/ -n 4 --dist=load -m "not setpriv".
  • Dev shell: nix-shell (provides clang-format, cppcheck, pytest-xdist, openssh, rsync, iproute2, valgrind, lcov; does not build on entry).
  • Gitea API token: supplied out-of-band via the TOKEN environment variable; it is intentionally not recorded in this file.
  • CI polling: GET /api/v1/repos/TapTap/FastSync/actions/runs?limit=N, match head_sha, then /actions/runs/<id>/jobs.
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