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5d2be4 |
From bc8bdaa57ba9b57671e2921705b99eaa70729ce7 Mon Sep 17 00:00:00 2001
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5d2be4 |
From: Mark Reynolds <mreynolds@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
5d2be4 |
Date: Wed, 11 Nov 2020 11:45:11 -0500
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5d2be4 |
Subject: [PATCH 4/8] Issue 4429 - NULL dereference in revert_cache()
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5d2be4 |
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5d2be4 |
Bug Description: During a delete, if the DN (with an escaped leading space)
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5d2be4 |
of an existing entry fail to parse the server will revert
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5d2be4 |
the entry update. In this case it will lead to a crash
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5d2be4 |
becuase ther ldbm inst struct is not set before it attempts
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5d2be4 |
the cache revert.
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5d2be4 |
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5d2be4 |
Fix Description: Check the the ldbm instance struct is not NULL before
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
5d2be4 |
dereferencing it.
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5d2be4 |
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5d2be4 |
Relates: https://github.com/389ds/389-ds-base/issues/4429
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5d2be4 |
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5d2be4 |
Reviewed by: firstyear & spichugi(Thanks!!)
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5d2be4 |
---
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5d2be4 |
.../tests/suites/syntax/acceptance_test.py | 40 +++++++++++++++++++
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5d2be4 |
ldap/servers/slapd/back-ldbm/cache.c | 3 ++
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
5d2be4 |
2 files changed, 43 insertions(+)
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5d2be4 |
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5d2be4 |
diff --git a/dirsrvtests/tests/suites/syntax/acceptance_test.py b/dirsrvtests/tests/suites/syntax/acceptance_test.py
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5d2be4 |
index db8f63c7e..543718689 100644
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5d2be4 |
--- a/dirsrvtests/tests/suites/syntax/acceptance_test.py
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
5d2be4 |
+++ b/dirsrvtests/tests/suites/syntax/acceptance_test.py
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5d2be4 |
@@ -6,12 +6,14 @@
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5d2be4 |
# See LICENSE for details.
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5d2be4 |
# --- END COPYRIGHT BLOCK ---
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5d2be4 |
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5d2be4 |
+import ldap
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5d2be4 |
import logging
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5d2be4 |
import pytest
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5d2be4 |
import os
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5d2be4 |
from lib389.schema import Schema
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5d2be4 |
from lib389.config import Config
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5d2be4 |
from lib389.idm.user import UserAccounts
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5d2be4 |
+from lib389.idm.group import Groups
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5d2be4 |
from lib389._constants import DEFAULT_SUFFIX
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5d2be4 |
from lib389.topologies import log, topology_st as topo
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5d2be4 |
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5d2be4 |
@@ -105,6 +107,44 @@ def test_invalid_uidnumber(topo, validate_syntax_off):
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5d2be4 |
log.info('Found an invalid entry with wrong uidNumber - Success')
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5d2be4 |
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5d2be4 |
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5d2be4 |
+def test_invalid_dn_syntax_crash(topo):
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5d2be4 |
+ """Add an entry with an escaped space, restart the server, and try to delete
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5d2be4 |
+ it. In this case the DN is not correctly parsed and causes cache revert to
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5d2be4 |
+ to dereference a NULL pointer. So the delete can fail as long as the server
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5d2be4 |
+ does not crash.
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5d2be4 |
+
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+ :id: 62d87272-dfb8-4627-9ca1-dbe33082caf8
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5d2be4 |
+ :setup: Standalone Instance
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5d2be4 |
+ :steps:
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5d2be4 |
+ 1. Add entry with leading escaped space in the RDN
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5d2be4 |
+ 2. Restart the server so the entry is rebuilt from the database
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5d2be4 |
+ 3. Delete the entry
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5d2be4 |
+ 4. The server should still be running
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5d2be4 |
+ :expectedresults:
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+ 1. Success
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+ 2. Success
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5d2be4 |
+ 3. Success
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5d2be4 |
+ 4. Success
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+ """
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+
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5d2be4 |
+ # Create group
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+ groups = Groups(topo.standalone, DEFAULT_SUFFIX)
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5d2be4 |
+ group = groups.create(properties={'cn': ' test'})
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+
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+ # Restart the server
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+ topo.standalone.restart()
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+
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+ # Delete group
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5d2be4 |
+ try:
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+ group.delete()
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5d2be4 |
+ except ldap.NO_SUCH_OBJECT:
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5d2be4 |
+ # This is okay in this case as we are only concerned about a crash
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5d2be4 |
+ pass
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+
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5d2be4 |
+ # Make sure server is still running
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5d2be4 |
+ groups.list()
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5d2be4 |
+
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5d2be4 |
+
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5d2be4 |
if __name__ == '__main__':
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# Run isolated
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5d2be4 |
# -s for DEBUG mode
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5d2be4 |
diff --git a/ldap/servers/slapd/back-ldbm/cache.c b/ldap/servers/slapd/back-ldbm/cache.c
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5d2be4 |
index 89f958a35..5ad9ca829 100644
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5d2be4 |
--- a/ldap/servers/slapd/back-ldbm/cache.c
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5d2be4 |
+++ b/ldap/servers/slapd/back-ldbm/cache.c
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5d2be4 |
@@ -614,6 +614,9 @@ flush_hash(struct cache *cache, struct timespec *start_time, int32_t type)
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5d2be4 |
void
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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revert_cache(ldbm_instance *inst, struct timespec *start_time)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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{
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ if (inst == NULL) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ return;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ }
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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flush_hash(&inst->inst_cache, start_time, ENTRY_CACHE);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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flush_hash(&inst->inst_dncache, start_time, DN_CACHE);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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}
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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--
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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2.26.2
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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