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Bug 805034 - accessing an undefined variable might cause crash
Summary: accessing an undefined variable might cause crash
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: sssd
Version: 6.3
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Stephen Gallagher
QA Contact: IDM QE LIST
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-03-20 13:49 UTC by Jakub Hrozek
Modified: 2020-05-02 16:50 UTC (History)
4 users (show)

Fixed In Version: sssd-1.8.0-17.el6
Doc Type: Bug Fix
Doc Text:
Cause: When an LDAP entry changed its attributes and was saved again into the SSSD cache, the SSSD might have accessed an undefined variable value Consequence: Accessing an undefined variable value crashed the SSSD Fix: The variable was initialized to a known default value Result: SSSD no longer crashed when updating cached entries
Clone Of:
Environment:
Last Closed: 2012-06-20 11:56:12 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
Crash backtrace (15.72 KB, text/plain)
2012-04-05 08:23 UTC, Kaushik Banerjee 		no flags Details
View All


Links
System ID Private Priority Status Summary Last Updated
Github SSSD sssd issues 2312 0 None None None 2020-05-02 16:49:22 UTC
Github SSSD sssd issues 2325 0 None None None 2020-05-02 16:50:17 UTC
Red Hat Product Errata RHBA-2012:0747 0 normal SHIPPED_LIVE sssd bug fix and enhancement update 2012-06-19 19:31:43 UTC

Description Jakub Hrozek 2012-03-20 13:49:26 UTC 
Description of problem:
The function list_missing_attrs() might in some circumstances return an undefined variable value, which leads to access to random memory and possibly a crash.

Version-Release number of selected component (if applicable):
1.8.0-15

How reproducible:
Unknown, Kaushik was able to occasionally reproduce this issue with service lookups. In general reproducing issues like this might be easier on 32bit architecture.

You can easily spot the random access when running sssd_be in valgrind.

Steps to Reproduce:
1. request a service
2. check out valgrind log or be lucky and witness a crash
3.
  
Actual results:


Expected results:


Additional info:
This was fixed upstream in the upstream 1.8 branch in 7d10875216a6b9e00c8a4063aa7df87a352fd530
Comment 2 Jakub Hrozek 2012-03-26 14:51:33 UTC 
Upstream ticket:
https://fedorahosted.org/sssd/ticket/1270
Comment 3 Jakub Hrozek 2012-03-30 19:30:04 UTC 
(In reply to comment #2)
> Upstream ticket:
> https://fedorahosted.org/sssd/ticket/1270

That upstream ticket was actually describing two different issues. I split the undefined variable access into a new ticket https://fedorahosted.org/sssd/ticket/1283
Comment 4 Jakub Hrozek 2012-04-03 18:55:00 UTC 
    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Cause: When an LDAP entry changed its attributes and was saved again into the SSSD cache, the SSSD might have accessed an undefined variable value

Consequence: Accessing an undefined variable value crashed the SSSD

Fix: The variable was initialized to a known default value

Result: SSSD no longer crashed when updating cached entries
Comment 5 Kaushik Banerjee 2012-04-05 08:23:34 UTC 
Created attachment 575318 [details]
Crash backtrace
Comment 6 Kaushik Banerjee 2012-04-05 08:27:58 UTC 
I able to reproduce the crash(sssd version 1.8.0-15) with the following steps:

1. Add the following services:

dn: cn=Svc1,ou=Services,dc=example,dc=com
objectClass: ipService
cn: svc1_alias1
cn: SVC1_Alias2
ipServicePort: 1234
ipServiceProtocol: tcp
 
dn: cn=Svc2,ou=Services,dc=example,dc=com
objectClass: ipService
cn: svc2_alias1
cn: SVC2_Alias2
ipServicePort: 1234
ipServiceProtocol: udp
 
2. sssd domain section:
[domain/LDAP]
debug_level=0xFFF0
id_provider = ldap
ldap_uri = ldap://ldapsrv.example.com
ldap_search_base = dc=example,dc=com
 
3. Lookup the services in the following way:
 
# getent -s sss services 1234/tcp
Svc1                  1234/tcp svc1_alias1 SVC1_Alias2
 
# getent -s sss services 1234/udp        <== no output. sssd_be crashes
Comment 7 Kaushik Banerjee 2012-04-05 08:29:03 UTC 
Crash is no longer seen.

Verified in version:
# rpm -qi sssd | head
Name        : sssd                         Relocations: (not relocatable)
Version     : 1.8.0                             Vendor: Red Hat, Inc.
Release     : 20.el6                        Build Date: Fri 30 Mar 2012 06:45:57 PM IST
Install Date: Mon 02 Apr 2012 05:36:37 PM IST      Build Host: x86-002.build.bos.redhat.com
Group       : Applications/System           Source RPM: sssd-1.8.0-20.el6.src.rpm
Size        : 7865577                          License: GPLv3+
Signature   : (none)
Packager    : Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>
URL         : http://fedorahosted.org/sssd/
Summary     : System Security Services Daemon
Comment 9 errata-xmlrpc 2012-06-20 11:56:12 UTC 
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.

http://rhn.redhat.com/errata/RHBA-2012-0747.html
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