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Add filesystem-specific trace tests in a dedicated file, following the
audit-test pattern of living alongside each subsystem's functional
tests.
trace_fs_test.c verifies that the add_rule_fs, check_rule_fs, and
deny_access_fs events fire with the correct fields on matching rules and
denied accesses, that check_rule_fs does not fire for unhandled access
types, and that no event fires without a sandbox. A denial covered by a
quiet rule still emits a deny_access_fs event but with logged=0, the
same suppression verdict audit applies; because that verdict must not
depend on CONFIG_AUDIT, the test also runs under a tracepoints-only
build.
Add trace_layout1 fixture tests in fs_test.c that reuse the layout1
hierarchy to verify the per-layer grants field: field values, multi-rule
pathwalk short-circuit, request intersection, the optional truncate
right surfacing in the request and grants, and an empty grants set from
a rule that grants none of the requested rights.
Cc: Günther Noack <gnoack@google.com>
Cc: Tingmao Wang <m@maowtm.org>
Link: https://patch.msgid.link/20260811094338.288094-16-mic@digikod.net
Signed-off-by: Mickaël Salaün <mic@digikod.net>
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