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Bug 1122015

Summary:	SHM refclock allows only two units with owner-only access
Product:	Red Hat Enterprise Linux 6	Reporter:	Miroslav Lichvar <mlichvar>
Component:	ntp	Assignee:	Miroslav Lichvar <mlichvar>
Status:	CLOSED ERRATA	QA Contact:	Vaclav Danek <vdanek>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	6.6	CC:	ovasik, psklenar, qe-baseos-daemons, vdanek
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	ntp-4.2.6p5-3.el6	Doc Type:	Enhancement
Doc Text:	This update introduces configurable access of memory segments used for Shared Memory Driver (SHM) reference clocks. Previously, only the first two memory segments were created with owner-only access, allowing just two SHM reference clocks to be used securely on a system. Now, the owner-only access to SHM is configurable with the "mode" option, and it is therefore possible to use more SHM reference clocks securely.	Story Points:	---
Clone Of:	1122012	Environment:
Last Closed:	2015-07-22 06:59:58 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:	1122012
Bug Blocks:	1085584, 1159824

Description Miroslav Lichvar 2014-07-22 11:10:09 UTC

+++ This bug was initially created as a clone of Bug #1122012 +++

Description of problem:
Currently, the permissions of the shared memory segment created by the SHM refclock are set from the unit number. Units 0 and 1 are created with owner-only access, units 2 and above have world access. This is a problem in applications where more units than two are needed and world access would be a security problem.

Upstream bug report with a patch:
http://bugs.ntp.org/show_bug.cgi?id=2627

Version-Release number of selected component (if applicable):
4.2.6p5-18

How reproducible:
Always

Steps to Reproduce:
1. add "server 127.127.28.2" to ntp.conf
2. restart ntpd
3. run ipcs
4. check permission of the memory segment with key 0x4e545032

Actual results:
666

Expected results:
600

Additional info:

Comment 6 errata-xmlrpc 2015-07-22 06:59:58 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.

https://rhn.redhat.com/errata/RHSA-2015-1459.html