chore(upstream): pin ET #792 SO_LINGER (skip)

[minpeter]

Summary

Weekday EternalTerminal watch: classify MisterTea/EternalTerminal#792 (584a68b4b54c74de7035e6108f49151ebce6a191, 2026-09-03) as security / skip. Pin ≠ ported.

Upstream C++ set SO_LINGER {l_onoff=1, l_linger=5} on every accepted TCP socket, then held process-wide globalMutex across a blocking ::close(). That froze the whole socket layer for ~5 seconds. The C++ fix only flips l_onoff from 1 to 0 in src/base/TcpSocketHandler.cpp.

et.rs already matches that outcome:

• full-tree grep: no SO_LINGER / so_linger (never enables linger)
• sockets are socket2 / TcpStream with nodelay/buffer opts only
• no process-wide mutex around close like UnixSocketHandler::close
• default linger-off is already equivalent

Do not add a SO_LINGER setsockopt just to set it off. No C++ merge. No Rust production change. No wire.json edit. PROTOCOL_VERSION stays 6. Tags remain et-v7.0.0 / 7656a32…. No GHSA found.

Pin / ledger

Field	Value
Pin tip	584a68b4b54c74de7035e6108f49151ebce6a191
Reviewed	2026-09-04
Release tag	et-v7.0.0 @ 7656a32a5bc15c6746726a27a5a4ba1e468fab6e
et.rs / ET wire	protocol v6 / protocol v6
7656a32...master	ahead_by 16, all classified

Files

• .github/upstream-ledger.yml — append 584a68b; classified: 2026-09-04
• .github/upstream-pin.yml — tip + reviewed date
• docs/upstream-pin.md — table row, tip SHA, dates

Verification

• python3 scripts/check-upstream-ledger.py --self-test
• python3 scripts/check-upstream-ledger.py (compare baseline...master has no unclassified SHAs; pin tip == master)

  

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Summary by cubic

Classifies EternalTerminal #792 (disable SO_LINGER) as security/skip and updates the upstream pin.

et.rs never sets SO_LINGER and has no process-wide mutex around close, so the default linger-off already matches the C++ fix. No production code changes; PROTOCOL_VERSION stays 6.

^{Written for commit 32a5d66. Summary will update on new commits.}

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[cubic-dev-ai]

No issues found across 3 files

_{Re-trigger cubic}