fix(update): keep Windows failed-restore state in trusted recovery records - #979
fix(update): keep Windows failed-restore state in trusted recovery records#979cairn-intern wants to merge 4 commits into
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Included review availability: Your plan provides up to 4 included reviews per hour; 0 remain after this review. WalkthroughThe Windows updater now records failed restores in trusted per-user state, consults those records during preflight, retains unresolved recovery copies during cleanup, and documents the required recovery steps. Regression tests cover marker deletion, record-write failures, durable queue handling, and unresolved cleanup. ChangesWindows recovery protection
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The change preserves failed Windows restore state in trusted recovery records and updates preflight and cleanup behavior accordingly; no actionable merge-blocking risk remains beyond normal checks and review. Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Full details: Linked Issues checkExplanation The changes satisfy issue Full details: Docstring CoverageExplanation Docstring coverage is 56.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 25 functions across 3 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 1
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Inline comments:
In `@internal/update/stage_windows.go`:
- Line 161: Update the recovery handling around appendUnresolvedRecoveryRecord
to detect persistence errors and retain a durable fail-closed preflight signal
when writing the unresolved recovery record fails, so promotion still refuses
after the .keep marker is removed. Add a regression test that forces the record
write failure, removes .keep, and verifies promotion remains blocked.
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docs/UPDATE.mdinternal/update/replace_windows.gointernal/update/stage_promote_windows_test.gointernal/update/stage_windows.go
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Vasanthdev2004
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Vasanthdev2004
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Requesting changes on one item. Your CI had never run either: held at action_required behind the fork gate with only CodeRabbit green. I released it and it passes.
persistFailedRestoreSignal can move the restored binary out of targetPath. When the per-user record write fails, it hands file and asidePath to keepUnmarkedRecoveryCopy, which relocates through the handle without first checking what the object at that path is. The failure case is the one that matters: the fallback for "I could not record the failure" can itself remove the binary the user is running. Compensation should not be able to make the situation worse than the state it is compensating for; checking the object's identity before relocating, the way the neighbouring code does, closes it.
Two smaller things I would not block on but would rather you knew:
unresolvedRecordedRecoveryPaths reads through loadRecoveryCleanupQueue, which returns an empty queue identically for a missing path, a read error and a JSON parse failure. So a truncated or unreadable state file silently switches the new refusal off rather than failing closed. For a file whose whole job is to remember that something went wrong, "unreadable" and "nothing to report" should not be the same answer.
The record lives under %AppData% (per-user) while the recovery copy and its .keep marker sit in the installation directory (per-machine). A second account on the same machine gets no refusal for a copy the first account left behind.
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Addressed in 6536b5a. Relocation of the restored binary. Regression: Unreadable state file. Per-user record vs per-machine copy. The record stays in the existing |
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jatmn
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I found issues that need to be addressed before this is ready.
Merge readiness
- [P1] Rebase onto current
mainbefore merge
internal/update/stage_windows.go:155
The branch merge base (27b319ca) is two commits behind livemain
(1b5db176), and repository guidance treats a stale base as a hard blocker.
Rebase and rerun the Windows updater checks on the resulting head before
merging.
Findings
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[P2] Do not report the unresolved recovery signal as persisted before it is durable
internal/update/replace_windows.go:548
The new failure path callsappendUnresolvedRecoveryRecord, whose queue writer
writes JSON to a temporary file and renames it into place. It returns success
immediately after that rename: it does not flush the temporary file's content
before the rename or otherwise establish that the replacement reached durable
storage.persistFailedRestoreSignalthen leaves the verified binary at the
normal.oldpath because it believes the trusted record has replaced the
attacker-removable.keepmarker.A crash or power loss in this acknowledgement window can therefore discard the
new unresolved record. After restart, an install-directory writer can remove
.keep; preflight sees neither signal and may rename the current target over
the last verified aside copy. This is a property of making an existing cleanup
queue the security-critical source of truth, rather than merely an advisory
cleanup backlog.Address the root cause by making the unresolved-state commit durable before
treating it as success—flush the record contents and use the strongest
supported replacement/metadata-durability operation on Windows, propagating
failures. If that guarantee cannot be made, take the existing relocation
fallback so preflight retains an install-directory recovery signal. Keep the
current identity binding and avoid changing normal successful-promotion cleanup
semantics.
Vasanthdev2004
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Vasanthdev2004
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The fix itself is right and I verified it. verifyPromotedTarget(file, asidePath) at replace_windows.go:474 runs before keepUnmarkedRecoveryCopy, so when the handle does not refer to the promoted target the compensation returns without relocating anything. That closes what I raised: the fallback can no longer move the live binary out from under the user.
The problem is that your regression test for it cannot see that on Windows. CI is red on Smoke (windows-latest), and it reproduces on my box deterministically:
--- FAIL: TestPersistFailedRestoreSignalDoesNotRelocateLiveBinary (0.00s)
stage_promote_windows_test.go:490: target = "" err=open ...\zero.exe:
The process cannot access the file because it is being used by another process,
want the live binary left in place
This is a sharing violation in the test, not a failure of the code under test. openRecoveryCopy opens with windows.DELETE access and FILE_SHARE_READ|FILE_SHARE_WRITE. The test still holds that handle when it calls os.ReadFile(targetPath), and Go's os.Open requests only FILE_SHARE_READ|FILE_SHARE_WRITE, with no FILE_SHARE_DELETE. The existing handle's DELETE access is then incompatible with the new opener's share mode, so Windows returns ERROR_SHARING_VIOLATION, whose text is the message above.
Closing the handle first is enough:
_ = live.Close()
got, readErr := os.ReadFile(targetPath)ok github.com/Gitlawb/zero/internal/update 4.034s
Reverting that one line puts the failure back, so that is the whole cause.
Worth saying explicitly, because the message points somewhere alarming: this is not a delete-pending target. If the handle had actually been marked for deletion the same text would appear, and that would have meant my original finding was still live. It is not. The guard holds, and once the test can read the file it asserts the right thing.
The two non-blocking notes from last time (loadRecoveryCleanupQueue treating unreadable and empty the same, and the per-user record against the per-machine copy) still stand as notes. I am not adding anything new. Fix the handle and this is good to go.
…cords A failed restore currently records the last verified binary only as a .deletable .keep marker in the install directory. Write an unresolved identity-bound record to the existing per-user update-recovery store on that failure path too, and consult it during preflight so deleting the marker cannot silence the tamper refusal. Fixes Gitlawb#868
… cannot be written Ignoring a failed appendUnresolvedRecoveryRecord left only the sibling .keep marker. An install-directory writer can delete that marker, after which preflight finds no unresolved state and a retry can overwrite the last verified recovery copy. Relocate that copy to a .recovery name when the per-user record cannot be persisted so promotion still refuses. Fixes Gitlawb#868
…ensation cannot record persistFailedRestoreSignal relocated through the handle when the per-user unresolved record could not be written, without checking that the object was still the aside copy. A restore that had already put the verified bytes back at targetPath then had that binary moved out of the executable path. Verify identity with verifyPromotedTarget before relocating. Unreadable recovery-state JSON now fails closed instead of looking like an empty queue. The per-user vs per-machine split is documented: a second account still relies on the install-directory .keep marker. Fixes Gitlawb#868
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Summary
Fixes #868. The issue is issue-approved.
Follow-up from #751: a failed Windows restore records that
<target>.oldholds the last verified binary only as a sibling.keepmarker in the install directory. A writer who can already write that directory deletes the marker, and the nextzero upgradeproceeds with no tamper refusal.#751 already writes identity-bound records to
UserConfigDir()/zero/update-recovery. That path was only reached on promote success. This change writes an unresolved-state record on failed restore too, and preflight consults it alongside the marker. No new store.Changes
stage_windows.go: on blocked restore,appendUnresolvedRecoveryRecordfor the aside copy (best-effort; the restore error is still what the operator sees).replace_windows.go:Unresolvedon the existing cleanup record; preflight unions live unresolved records with.keepmarkers; cleanup skips unresolved copies so a deleted marker cannot turn the last verified binary into a delete candidate.docs/UPDATE.md: accepting the installed binary means deleting the recovery copy itself, not only the marker.Tests
TestPreflightRefusesWhenRecoveryMarkerIsDeletedButTrustedRecordRemains— marker gone, trusted record still refuses.TestSuccessfulPromoteCleanupRecordDoesNotBlockLaterUpdate— success path still writes a non-unresolved cleanup record; next update proceeds.TestPrepareRecoveryCleanupSkipsUnresolvedRecords— defense in depth if cleanup runs without preflight.go testwas not run locally (no checkout).gofmtclean. CI will run the Windows update tests.Summary by CodeRabbit
Bug Fixes
Documentation