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Harden Secure Kernel live control - #472
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Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe default tool surface now excludes the opt-in ChangesTool Surface Selection
Secure Kernel Policy and Live Controls
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant Worker
participant Sessions
participant Session
participant Supervisor
Worker->>Sessions: Report retained-stop pause and maximum duration
Sessions->>Session: Start timer for the current generation
Worker->>Sessions: Report successful continue
Sessions->>Session: Invalidate the timer
Sessions->>Session: Close session if the matching timer expires
Session->>Supervisor: Begin teardown
Merge Risk: ⚪ Minimal · up to No actionable issue identified in this review prevents merging after normal checks. Pre-merge checks |
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| Check name | Status | Explanation | Resolution |
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| Docstring Coverage |  |
Docstring coverage is 39.38% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 160 functions across 14 files. (3 skipped… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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|---|---|---|
| Description Check |  |
Check skipped - CodeRabbit’s high-level summary is enabled. |
| Title check | |
The title clearly summarises the primary change: hardening Secure Kernel live control. It is concise, specific and relevant to the changeset. |
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A rabbit checks the toolset list,
The extra group is opt-in, not missed.
A fixed pause marks the stopping time,
The timer guards the session line.
Roots are checked before kits can run,
Then logs record what steps were done.
The rabbit hops; the tests are spun.
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| let max_pause_ms = held_live_control(&mut sk_live.session)?.max_pause_ms(); | ||
| emit(&WorkerMessage::SecureKernelPauseStarted { max_pause_ms }); |
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When max_pause_ms is shorter than a slow or stalled provider exchange, this starts the supervisor timer too late: LiveControl::wait_for_stop has already retained the dispatcher event before it publishes the stop, reads registers twice, and validates it, but SecureKernelPauseStarted is emitted only after that entire method returns. Those exchanges can each consume their own timeout while the guest remains paused, so an operator-configured absolute bound—especially any value below the provider timeout—can be exceeded before the timer even begins; establish and enforce the deadline at event retention instead.
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| for write in audit_writes { | ||
| tracing::info!( | ||
| target: "windbg_mcp::secure_kernel_mutation", | ||
| vm_id = %self.target.vm_id, | ||
| partition_id = ?self.target.partition_id, | ||
| vp = self.target.vp, | ||
| register = ?write.name, | ||
| expected = ?write.expected, | ||
| value = ?write.value, | ||
| "control provider verified a VTL1 register write" |
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When a provider returns the requested register names but reports a nonzero status or an unchanged/wrong value, validate_values still succeeds because it checks only count, uniqueness, and ordering, so this emits a successful “verified” mutation record. sklive::write_one rejects that same response immediately afterward and enters recovery, leaving the audit log falsely claiming that a write was verified; base the log on the returned status/value after those checks rather than on the requested writes.
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Actionable comments posted: 6
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @DONE.md:
- Around line 8761-8764: Update the item 106 record in DONE.md to resolve its
inconsistent surface counts and percentages: either label the 11-tool, 15,573 B
figures as historical or replace them with the current 12-tool, 19,013 B figures
and consistent percentages from the Implementation status section.
Review comments at @src/engine.rs:
- Around line 3307-3321: Update begin_secure_kernel_pause and
end_secure_kernel_pause so ending a pause wakes its expiry task and lets it exit
early, rather than retaining the Session and Sessions until max_pause_ms
elapses. Use a cancellation signal such as Notify or watch, while preserving
expiry for the current pause generation.
Review comments at @src/proto.rs:
- Line 1344: Update the SecureKernelPauseStarted flow in wait_for_stop so the
max_pause_ms deadline begins when the stop event is retained, before validation
or provider I/O. Ensure enforcement remains active if stop acceptance fails or
stalls, and do not start a fresh full-duration timer after wait_for_stop
returns.
Review comments at @src/sklive.rs:
- Line 1446: Remove raw epoch values from mutation trace logs, replacing them
with non-sensitive transition identifiers or omitting them. Update the stopped,
armed, step, and continue epoch logging sites in src/sklive.rs at lines 1446,
1224, 1564, and 1643, and the provider epoch logging site in src/skcontrol.rs at
line 634; retain other useful transition context.
Review comments at @src/skpolicy.rs:
- Around line 103-109: Update the max_pause_ms validation in the policy startup
path to reject values below the minimum needed for CLEANUP_SETTLE and its
teardown reserve, using the existing cleanup timing symbols; preserve the
current upper-bound check.
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📒 Files selected for processing (27)
DONE.mdFOLLOWUPS.mdREADME.mddocs/remote-listener.mddocs/secure-kernel/kd-facade.mddocs/secure-kernel/live-control-provider.mddocs/smoke-test.mddocs/token-budget.mddocs/tool-surface.mdsrc/client.rssrc/engine.rssrc/kdtarget.rssrc/listen.rssrc/main.rssrc/proto.rssrc/savedstate.rssrc/server.rssrc/service.rssrc/skcontrol.rssrc/skdispatch.rssrc/sklive.rssrc/skpolicy.rssrc/toolset.rssrc/worker.rstests/golden/tool_budget.jsontests/golden/tools_list.jsontests/mcp_smoke.rs
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- tests/golden/tools_list.json
- FOLLOWUPS.md
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| let session = Arc::clone(session); | ||
| let sessions = self.clone(); | ||
| tokio::spawn(async move { | ||
| tokio::select! { | ||
| _ = tokio::time::sleep(service_pause) => { | ||
| sessions | ||
| .expire_secure_kernel_pause(session, generation, max_pause_ms) | ||
| .await; | ||
| } | ||
| _ = cancelled => {} | ||
| } |
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When a stopped ordinary live-control session is closed via end_session, idle/capacity reclamation, or client disconnect, the worker never emits SecureKernelPauseEnded because that message is sent only after a successful step or continue. Consequently this spawned task retains both the Arc<Session> and a cloned Sessions registry until the service pause expires—up to nearly an hour with the allowed policy maximum—and repeated open/stop/close cycles accumulate dormant tasks and retained session state. Cancel the pause handle from every terminal/release path, not only from SecureKernelPauseEnded.
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| .release( | ||
| &session, | ||
| Call::supervisor(EngineOp::EndSession), | ||
| END_SESSION_TIMEOUT, |
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When sk_live_read_memory, sk_live_step, or sk_live_continue is already executing as the service interval expires, this release is only queued behind that operation on the serialized engine thread. These handlers call the non-deadline read_memory/step/continue_from variants, and the request reader interrupts only resumed-target pumps, so a stalled memory read can consume LIVE_MEMORY_WAIT (60 seconds) and provider exchanges can consume their own 10-second waits. With a 10-second policy bound, for example, teardown is queued at 5 seconds but cannot run until after the retained recovery deadline; Session::close then finds that deadline expired and preserves a potentially paused target. Pass the retained pause/recovery deadline through every operation permitted while stopped instead of relying on a queued EndSession to enforce the absolute bound.
AGENTS.md reference: AGENTS.md:L24-L24
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @tests/mcp_smoke.rs:
- Line 20365: Update the transcript polling loop that checks
WINDBG_MCP_KD_SCRIPT_COMPLETE so it waits for a reliable indication that KD
processed q before killing kd.exe; do not rely on the pre-q completion marker or
quit: if it may be delayed until the server closes.
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📒 Files selected for processing (11)
DONE.mddocs/secure-kernel/kd-facade.mddocs/smoke-test.mdsrc/engine.rssrc/kdtarget.rssrc/skcontrol.rssrc/skdispatch.rssrc/sklive.rssrc/skpolicy.rssrc/worker.rstests/mcp_smoke.rs
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- src/sklive.rs
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| let transition = held_live_control(&mut sk_live.session)? | ||
| .step(e, &epoch, guard) | ||
| .map_err(failed)?; | ||
| emit(&WorkerMessage::SecureKernelPauseEnded); |
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When a caller successfully invokes sk_live_step but does not immediately invoke sk_live_wait, this message cancels the only supervisor pause timer even though the ReleaseMode::ArmNextStop path leaves vmwp debugger-stopped at the native-return boundary while the next trap is armed. No replacement timer starts until the subsequent wait retains another event, so a disconnected or stalled caller can leave the guest halted indefinitely (or until the independently configurable listener idle release); carry the existing deadline across the step-to-wait interval instead of reporting the pause ended here.
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| let activity = WaitActivity::for_kd( | ||
| Duration::from_millis(u64::from(DEBUG_WAIT)), | ||
| service_pause_bound(max_pause), | ||
| max_pause, | ||
| ); |
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When sk_live_step is followed by sk_live_wait late in the original pause window, this creates a new activity with the full 60-second DEBUG_WAIT and fresh pause/recovery bounds. The step's ReleaseMode::ArmNextStop path clears dispatcher.recovery_deadline, so the wait cannot observe the original deadline; although the supervisor retains its original timer, expiry only queues EndSession behind this wait and does not interrupt it. A 10-second policy window can therefore remain paused for up to another 60 seconds, and a newly retained stop installs deadlines measured from the second stop. The fresh evidence in this revision is that SecureKernelPauseEnded was removed from the step path without propagating the retained deadline into this newly constructed activity; carry that deadline across the step and cap this wait by it.
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| if session.kind == SessionKind::SecureKernelLive { | ||
| self.end_secure_kernel_pause(session); |
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When EndSession takes longer than END_SESSION_TIMEOUT but subsequently succeeds, release returns early through the preserved-controller branch above and never reaches this cancellation, while the later WorkerMessage::Done path closes and kills the session without cancelling secure_kernel_pause. The timer therefore retains the closed session and registry until the configured service pause expires—potentially nearly an hour—and repeated slow-but-successful teardowns accumulate dormant tasks. The fresh evidence in this revision is that the late-success handling at WorkerMessage::Done confirms release without invoking this cancellation path.
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| const CLEANUP_SETTLE: Duration = Duration::from_secs(5); | ||
| pub(crate) const CLEANUP_SETTLE: Duration = Duration::from_secs(5); | ||
| /// Smallest pause window that leaves both a service interval and the mandatory cleanup settle. | ||
| pub(crate) const MIN_PAUSE_MS: u64 = CLEANUP_SETTLE.as_millis() as u64 * 2; |
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When policy uses the documented minimum max_pause_ms of 10,000, service_pause_bound reserves exactly five seconds for cleanup, but settle_unregister_cleanup requires at least the full five seconds still remaining after the preceding provider restoration, event completion, attach, unregister, and deferred-cleanup work. Any time spent in those required steps makes the remaining duration less than CLEANUP_SETTLE, so expiry necessarily fails closed before settling and can leave the controller unresolved instead of completing within the advertised bound. Raise the minimum or reserve the settle interval plus sufficient teardown headroom.
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| let deadline = [ | ||
| deadline, | ||
| self.dispatcher.recovery_deadline, | ||
| self.pause_window.map(|window| window.recovery_deadline), |
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When the pause timer expires after sk_live_step but before the next wait, this now selects the original recovery deadline, but LiveControl::close_inner enters its State::Running-with-baseline branch and ignores that deadline: it calls non-deadline begin_disarm plus provider begin/read/write/finish operations. begin_disarm itself uses settle_native_completion(None) and a Hyper-V path with a 60-second timeout, while the maximum cleanup reserve is only 30 seconds, so the advertised absolute pause bound can still be exceeded with the guest paused. Fresh evidence beyond the earlier stopped-operation report is this post-step teardown path; thread the recovery deadline through running disarm and its provider operations.
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Completes FOLLOWUPS.md item 118.
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securekernel;allprovides all 76 tools.Documentation