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Bug 861032

Summary: Segfault on startup if corosync.conf is wrong
Product: Red Hat Enterprise Linux 6 Reporter: Jan Friesse <jfriesse>
Component: corosyncAssignee: Jan Friesse <jfriesse>
Status: CLOSED ERRATA QA Contact: Cluster QE <mspqa-list>
Severity: urgent Docs Contact:
Priority: urgent    
Version: 6.3CC: asalkeld, jfriesse, jkortus, nik.martin, sdake
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: corosync-1.4.1-11.el6 Doc Type: Bug Fix
Doc Text:
Cause: corosync.conf contains ringnumber > 1 Consequence: Segfault Fix: Added check in corosync.conf parser. If ringnumber is > 1, correct error message is printed (interface ring number X is bigger then allowed maximum 1). Result: Corosync doesn't segfault if ringnumber in config is > 1 and proper error message is printed.
 Story Points: ---
Clone Of: 860711 Environment:
Last Closed: 2013-02-21 07:50:52 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 860711    
Bug Blocks:    
Attachments:
Description Flags
Proposed patch none

Description Jan Friesse 2012-09-27 11:03:18 UTC 
Created attachment 618000 [details]
Proposed patch

+++ This bug was initially created as a clone of Bug #860711 +++

Created attachment 617571 [details]
corosync.crash

Description of problem:

Moved config files forward from a 6.2_el6 version of Corosync.  Made minor change to config to use different multicast address than an existing corosync on same network.

Version-Release number of selected component (if applicable):
corosync-1.4.1-7.el6_3.1.x86_64

How reproducible:
Have an invalid config file, start corosync.

Steps to Reproduce:
1. use the config file attached
2. start corosync
3.
  
Actual results:
*** glibc detected *** corosync: corrupted double-linked list: 0x0000000001cca190 ***
Under gdb:
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff6e581e3 in _int_malloc () from /lib64/libc.so.6


Expected results:
Corosync to tell me it has an invalid config and exit

Additional info:

--- Additional comment from jfriesse on 2012-09-27 06:32:03 EDT ---

Pretty nasty bug. Main problem is hidden in "ringnumber: 2" line. We have dynamically allocated array with size of 2 and we are using direct indexing of ringnumber for that array (so we are using item 3).

This bug affects ALL releases RHEL 6 and also upstream master!

Many thanks for pointing this bug out.

--- Additional comment from jfriesse on 2012-09-27 07:01:14 EDT ---

Created attachment 617999 [details]
Proposed patch

Don't access invalid mem in totemconfig interfaces

When ringnumber in config file was set to value bigger or equal to
INTERFACE_MAX, we are using this big value as index to totemconfig
interfaces array, resulting to access to invalid memory and segfault.

Instead of that, ringnumber is now checked and proper error message is
printed if value is too big.
Comment 5 Jaroslav Kortus 2012-11-16 14:22:31 UTC 
Verified with corosync-1.4.1-11.el6.x86_64:

corosync[32508]:   [MAIN  ] parse error in config: interface ring number 10 is bigger then allowed maximum 1

config used:
totem {
	version: 2
	secauth: off
	threads: 0
	rrp_mode: passive
	interface {
		ringnumber: 0
		bindnetaddr: 192.168.101.1
		mcastaddr: 226.94.1.1
		mcastport: 5405
		ttl: 1
	}

	interface {
		ringnumber: 10
		bindnetaddr: 192.168.201.1
		mcastaddr: 226.94.1.2
		mcastport: 5405
		ttl: 1
	}

}

logging {
	fileline: off
	to_stderr: no
	to_logfile: yes
	to_syslog: yes
	logfile: /var/log/cluster/corosync.log
	debug: off
	timestamp: on
	logger_subsys {
		subsys: AMF
		debug: off
	}
}

amf {
	mode: disabled
}

It starts properly with valid ring ids.
Comment 7 errata-xmlrpc 2013-02-21 07:50:52 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-2013-0497.html