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DescriptionLukas Slebodnik
2017-10-16 13:50:48 UTC
Description of problem:
There is an incompatible ABI change in libldb-1.1.30[1,2]. SSSD will crash if sssd was compiled with older version and started with newer libldb than 1.1.30.
We need to ensure that such situation will not happen. And the simplest solution is on rpm level. So it will not be allowed to install incompatible packages.
Because some people tend upgrade just subset of packages or just security updates (e.g. BZ#1484423)
Referenced link to libldb rebase bug
https://bugzilla.redhat.com/show_bug.cgi?id=1470056
[1] https://lists.samba.org/archive/samba-technical/2017-June/121233.html
[2] https://bugzilla.samba.org/show_bug.cgi?id=12859
Version-Release number of selected component (if applicable):
All sssd version compiled with libldb <= 1.1.30 (rhel <= 7.4)
How reproducible:
Deterministic
Steps to Reproduce:
1. systemctl start sssd.service
Actual results:
sh# /usr/sbin/sssd -i
(Mon Oct 16 09:30:07 2017) [sssd] [sysdb_domain_init_internal] (0x0200): DB File for LDAP: /var/lib/sss/db/cache_LDAP.ldb
(Mon Oct 16 09:30:07 2017) [sssd] [sysdb_domain_init_internal] (0x0200): Timestamp file for LDAP: /var/lib/sss/db/timestamps_LDAP.ldb
Segmentation fault (core dumped)
sh# coredumpctl info
PID: 25224 (sssd)
UID: 0 (root)
GID: 0 (root)
Signal: 11 (SEGV)
Timestamp: Mon 2017-10-16 09:29:32 EDT (10min ago)
Command Line: /usr/sbin/sssd -i -f
Executable: /usr/sbin/sssd
Control Group: /system.slice/sssd.service
Unit: sssd.service
Slice: system.slice
Boot ID: 27096d033d77453c99f5126d31f46fcb
Machine ID: 345337a612b343269f70a188e640870c
Coredump: /var/lib/systemd/coredump/core.sssd.0.27096d033d77453c99f5126d31f46fcb.25224.1508160572000000.xz
Message: Process 25224 (sssd) of user 0 dumped core.
Stack trace of thread 25224:
#0 0x00007f1b76112d58 __dso_handle (memberof.so)
Expected results:
No crash
Additional info:
The similar situation was in fedora26 and fedora26. And it is solved on packaging level.
fedora <= 26:
* has libldb-1.1.29
* conflict in sssd spec file
https://src.fedoraproject.org/rpms/sssd/blob/f26/f/sssd.spec#_254
fedora >= 27
* has libldb 1.2.2
* sssd requires libldb >= 1.2
https://src.fedoraproject.org/rpms/sssd/blob/f27/f/sssd.spec#_256
Verified this bug on SSSD Version : sssd-1.16.0-6.el7
Steps followed during verification:
1. Setup RHEL-7.5 system and install older version of sssd and libldb and avoid samba package, see the command output below:
# rpm -q sssd samba libldb
sssd-1.15.2-50.el7.x86_64
package samba is not installed
libldb-1.1.29-1.el7.x86_64
2. Clear the cache and ensure sssd service is stopped.
3. Install samba package. This should update libldb and other packages keeping older sssd version intact.
# yum install samba
Loaded plugins: product-id, search-disabled-repos, subscription-manager
This system is not registered with an entitlement server. You can use subscription-manager to register.
Resolving Dependencies
--> Running transaction check
.
.
.
Updating : samba-common-4.7.1-2.el7.noarch
Updating :libldb-.2.2-1.el7.x86_64
Updating : libwbclient-4.7.1-2.el7.x86_64
Updating : samba-client-libs-4.7.1-2.el7.x86_64
Installing : samba-common-libs-4.7.1-2.el7.x86_64
Installing : pytalloc-2.1.10-1.el7.x86_64
Installing : samba-libs-4.7.1-2.el7.x86_64
Installing : samba-common-tools-4.7.1-2.el7.x86_64
Installing : samba-4.7.1-2.el7.x86_64
# rpm -q sssd samba libldb
sssd-1.15.2-50.el7.x86_64
samba-4.7.1-2.el7.x86_64
libldb-1.2.2-1.el7.x86_64
4. Now start SSSD service, it should show segmentation fault.
# /usr/sbin/sssd -i
Segmentation fault
5. Upgrade sssd to the latest version and restart sssd service. SSSD should work fine now.
# yum upgrade sssd
# rpm -q sssd samba libldb
sssd-1.16.0-6.el7.x86_64
samba-4.7.1-2.el7.x86_64
libldb-1.2.2-1.el7.x86_64
# systemctl start sssd
# systemctl status sssd
● sssd.service - System Security Services Daemon
Loaded: loaded (/usr/lib/systemd/system/sssd.service; disabled; vendor preset: disabled)
Active: active (running) since Tue 2017-11-28 16:05:43 EST; 2s ago
Main PID: 25512 (sssd)
.
.
6. Run user lookup and ensure SSSD is functioning properly.
# getent passwd testuser1
testuser1:*:2121:2121:testuser1:/home/testuser1:/bin/bash
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHEA-2018:0929