fabi/Xenia-Canary
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[Audit] round 24: signal-path probes (XEvent::Set + IO + NtDuplicateObject)

Browse Source 
Adds AUDIT-HLC probes for every path that signals an XEvent or duplicates
its handle, so the round-23 puzzle (waits completing without visible
NtSetEvent/KeSetEvent) can be cross-referenced by underlying X_KEVENT VA
and by primary handle.

  * NtCreateEvent_inner: always log kevent_va for handle/VA cross-ref
  * XEvent::Set: universal hook prints primary handle + kevent_va + LR;
    catches all paths into the event regardless of shim used
  * NtSetEvent: extended with PPC back-chain walk for caller's guest_lr
    (same idiom as the wait probe), so the signaler function is
    immediately identifiable
  * NtReadFile / NtReadFileScatter / NtWriteFile: log when signal_event
    path fires ev->Set() inline at IO completion (bypasses both
    NtSetEvent and KeSetEvent shims)
  * CompleteOverlappedEx (kernel_state.cc): log when overlapped event
    is signaled at completion
  * NtDuplicateObject: log src/dst handle pair (round-24 confirmed silph
    event is dup'd before signaling, explaining the handle-mismatch
    puzzle between NtSetEvent's `handle=` argument and XEvent::Set's
    primary handle())

Result: silph wait at sub_821CB030+0x1B0 on handle F80000A0 is signaled
via NtSetEvent on handle F80000A8 (the duplicate created by sub_8245D9D8
at lr=0x82450DF4 inside the worker chain sub_82450A28 ← 0xA68 ← 0xB68).
Verdict A confirmed: signaler exists and is reachable, but round-17.β
missed it because the search keyed on the wrong handle. No bypass path;
the worker chain is identical between canary and ours-impl, but ours
signals different handles (work-item queue divergence at sub_82452DC0).

Audit-only diagnostic. No semantic changes. Net delta +86 LOC across 7
files. All probes gated on the existing audit_handle_lifecycle cvar
(default off). Tested via Sylpheed boot (35 s, 4 MB log). Audit-handle-
lifecycle-probes branch, local-only.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
MechaCat02
2026-06-08 21:09:40 +02:00
parent 4670afbeb5
commit 07f09f8fe0
7 changed files with 91 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
src/xenia/kernel/kernel_flags.cc
View File

@@ -18,3 +18,8 @@ DEFINE_bool(audit_handle_lifecycle, false,
"Emit XELOGKERNEL on Event/Semaphore/Wait lifecycle "
"(create/set/wait/complete). Audit oracle probe — off by default.",
"Auditing");
DEFINE_uint32(audit_track_event_handle, 0,
"If non-zero and AUDIT-HLC enabled, log underlying X_KEVENT "
"guest VA whenever NtCreateEvent returns this handle. "
"Audit round-24 oracle probe.",
"Auditing");