selftests/landlock: Filter dealloc records in audit_count_records()

audit_count_records() counts both AUDIT_LANDLOCK_DOMAIN allocation and
deallocation records in records.domain .  Domain deallocation is tied to
asynchronous credential freeing via kworker threads
(landlock_put_ruleset_deferred), so the dealloc record can arrive after
the drain in audit_init() and after the preceding audit_match_record()
call.  This causes flaky failures in tests that assert an exact
records.domain count: a stale dealloc record from a previous test's
domain inflates the count by one.

Observed on x86_64 under build configurations that delay the kworker
firing the dealloc callback (e.g. coverage instrumentation): the
audit_layout1 tests in fs_test.c intermittently saw records.domain == 2
where 1 was expected.  The fix is in the shared helper, so those
existing checks become robust without needing a fs_test.c edit.

Filter audit_count_records() with a regex to skip records containing
deallocation status.  The remaining domain records (allocation, emitted
synchronously during landlock_log_denial()) are deterministic.
Deallocation records are already tested explicitly via
matches_log_domain_deallocated() in audit_test.c, which uses its own
domain-ID-based filtering and longer timeout.

With this filter in place, re-add the records.domain == 0 checks that
were removed in commit 3647a4977fb7 ("selftests/landlock: Drain stale
audit records on init") as a workaround for this race.

Cc: Günther Noack <gnoack@google.com>
Cc: stable@vger.kernel.org
Depends-on: 07c2572a8757 ("selftests/landlock: Skip stale records in audit_match_record()")
Fixes: 6a500b22971c ("selftests/landlock: Add tests for audit flags and domain IDs")
Tested-by: Günther Noack <gnoack3000@gmail.com>
Link: https://patch.msgid.link/20260513105112.140137-1-mic@digikod.net
Signed-off-by: Mickaël Salaün <mic@digikod.net>

0 files changed, 0 insertions, 0 deletions