winbind: Add test for lookuprids cache problem

When reading entries from gencache, wb_cache_rids_to_names() can
return STATUS_SOME_UNMAPPED, which _wbint_LookupRids() does not handle
correctly.

This test enforces this situation by filling gencache with one wbinfo
-R and then erasing the winbindd_cache.tdb. This forces winbind to
enter the domain helper process, which will then read from gencache
filled with the previous wbinfo -R.

Without having the entries cached this does not happen because
wb_cache_rids_to_names() via the do_query: path calls deep inside
calls dcerpc_lsa_lookup_sids_noalloc(), which hides the
STATUS_SOME_UNMAPPED that came in as lsa_LookupSids result value.

Bug: https://bugzilla.samba.org/show_bug.cgi?id=14435
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
(cherry picked from commit 04eafce653afcff517317d2b190acc4f0cbf4c61)

1 files changed, 1 insertions, 0 deletions

diff --git a/selftest/knownfail.d/lookuprids_cache b/selftest/knownfail.d/lookuprids_cache
new file mode 100644
index 00000000000..d3c40a62b45
--- /dev/null
+++ b/selftest/knownfail.d/lookuprids_cache
@@ -0,0 +1 @@
+^samba.wbinfo_lookuprids_cache.lookuprids2\(nt4_member:local\)
\ No newline at end of file