[389-commits] [389-ds-base] branch 389-ds-base-1.4.1 updated: Ticket 50905 - intermittent SSL hang with rhds

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tbordaz pushed a commit to branch 389-ds-base-1.4.1
in repository 389-ds-base.

The following commit(s) were added to refs/heads/389-ds-base-1.4.1 by this push:
new 21638c0 Ticket 50905 - intermittent SSL hang with rhds
21638c0 is described below

commit 21638c04a3bb4b84910dc79c1e676912a390f3cd
Author: Thierry Bordaz <tbordaz@redhat.com>
AuthorDate: Fri Apr 3 15:23:10 2020 +0200

Ticket 50905 - intermittent SSL hang with rhds

Bug Description:
On a successfull sasl bind, a new IO layer (sasl_io_enable) is registered on top of
the connection. Then sasl bind sends the successful result. Registration is
done while sasl bind thread holds c_mutex but result is sent while the c_mutex
is released.

If a new operation comes in just after c_mutex was released it is
possible that sasl bind sends the result while the new IO layer is pushed.
IO layers is partially initialized at that time. It can create sigseg or
deadlock or...

Fix Description:
The fix is to protect the send result from IO layer push.
i.e. move send_ldap_result into c_mutex

https://pagure.io/389-ds-base/issue/50905

Reviewed by: Mark Reynolds (Thanks !!)

Platforms tested: F29

Flag Day: no

Doc impact: no
---
ldap/servers/slapd/saslbind.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/ldap/servers/slapd/saslbind.c b/ldap/servers/slapd/saslbind.c
index 7cad0db..6a43d2e 100644
--- a/ldap/servers/slapd/saslbind.c
+++ b/ldap/servers/slapd/saslbind.c
@@ -1118,12 +1118,16 @@ sasl_check_result:
/* Enable SASL I/O on the connection */
pthread_mutex_lock(&(pb_conn->c_mutex));
connection_set_io_layer_cb(pb_conn, sasl_io_enable, NULL, NULL);
+
+ /* send successful result before sasl_io_enable can be pushed by another incoming op */
+ send_ldap_result(pb, LDAP_SUCCESS, NULL, NULL, 0, NULL);
+
pthread_mutex_unlock(&(pb_conn->c_mutex));
+ } else {
+ /* send successful result */
+ send_ldap_result(pb, LDAP_SUCCESS, NULL, NULL, 0, NULL);
}

- /* send successful result */
- send_ldap_result(pb, LDAP_SUCCESS, NULL, NULL, 0, NULL);
-
/* remove the sasl data from the pblock */
slapi_pblock_set(pb, SLAPI_BIND_RET_SASLCREDS, NULL);


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