Bug 1043557 – nscd segfaults when running sudo with netgroup caching enabled.

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Bug 1043557 - nscd segfaults when running sudo with netgroup caching enabled.

Summary:	nscd segfaults when running sudo with netgroup caching enabled.

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 6
Classification:	Red Hat
Component:	glibc (Show other bugs)
Sub Component:
Version:	6.5
Hardware:	x86_64 Linux

Priority	high Severity high
Target Milestone:	rc
Target Release:	6.6
Assigned To:	Siddhesh Poyarekar
QA Contact:	Arjun Shankar
Docs Contact:

URL:
Whiteboard:
Keywords:	Reopened, ZStream

Duplicates:	1087838 (view as bug list)
Depends On:
Blocks:	994246 1023566 1056252 1054846 1087789
	Show dependency tree / graph

Reported:	2013-12-16 11:09 EST by hgraham
Modified:	2016-11-24 07:10 EST (History)
CC List:	19 users (show)

See Also:
Fixed In Version:	glibc-2.12-1.133.el6
Doc Type:	Bug Fix
Doc Text:	Due to problems with buffer extension and reallocation, the nscd daemon terminated unexpectedly with a segmentation fault when processing long netgroup entries. With this update, the handling of long netgroup entries has been corrected and nscd no longer crashes in the described scenario.
Story Points:	---
Clone Of:
Clones:	1138520 (view as bug list)
Environment:
Last Closed:	2014-10-14 00:42:37 EDT
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Knowledge Base (Solution)	643023	None	None	None	Never
Red Hat Product Errata	RHSA-2014:1391	normal	SHIPPED_LIVE	Moderate: glibc security, bug fix, and enhancement update	2014-10-13 21:11:04 EDT

Groups: None (edit)

Description hgraham 2013-12-16 11:09:26 EST

Description of problem:
After upgrading to RHEL6.5 nscd segfaults when a user runs sudo. It appears the problem is due to netgroup caching by nscd. The netgroups are stored in LDAP.

Version-Release number of selected component (if applicable):
nscd-2.12-1.132.el6.x86_64

How reproducible:
I haven't reproduced, but this is happening on multiple servers for the customer

Steps to Reproduce:
1. Need to use sudo with nscd netgroup caching and netgroups stored in LDAP

Actual results:
nscd segfaults when running sudo

Dec 13 08:54:28 server kernel: nscd[11646]: segfault at 7fffe54ed000 ip 00007ffff6e32aab sp 00007fffe54e98e8 error 6 in libc-2.12.so[7ffff6da9000+18b000]

Expected results:
nscd doesn't segfault when running sudo


Additional info:
possible workaround may be to disable netgroup caching by nscd

Comment 20 Carlos O'Donell 2013-12-20 14:04:58 EST

The solution in this case is to upgrade nss nss-tools and nss-sysinit. NSS is used by glibc for hashing functions and there are bugs in nss* that impact glibc and nscd.

Comment 65 Siddhesh Poyarekar 2014-04-15 10:15:18 EDT

*** Bug 1087838 has been marked as a duplicate of this bug. ***

Comment 67 errata-xmlrpc 2014-10-14 00:42:37 EDT

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/RHSA-2014-1391.html

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