Bug 237055

Summary:	qemu can't generate the tap device with recent kernels
Product:	[Fedora] Fedora	Reporter:	David G. Mackay <mackay_d>
Component:	qemu	Assignee:	Ric Wheeler <rwheeler>
Status:	CLOSED NOTABUG	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	9	CC:	hdegoede
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2008-06-11 10:10:13 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description David G. Mackay 2007-04-19 03:37:35 UTC

Description of problem:
With kernels >= 2.6.18, creation of the tap device requires CAP_NET_ADMIN
capability.  As a result, qemu can't create the tap device.  

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


How reproducible:


Steps to Reproduce:
1.
2.
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Actual results:


Expected results:


Additional info:
One workaround is to use tunctl from the User Mode Linux uml_utils available via
http://user-mode-linux.sourceforge.net/dl-sf.html.  The Copyright statement in
the spec file needs to be changed to License.  After that, an rpmbuild generates
an rpm.  It would be nice to have that in extras.

Comment 1 Bug Zapper 2008-05-14 02:47:09 UTC

Changing version to '9' as part of upcoming Fedora 9 GA.
More information and reason for this action is here:
http://fedoraproject.org/wiki/BugZappers/HouseKeeping

Comment 3 Daniel Berrangé 2008-06-11 10:10:13 UTC

QEMU requires root to create TAP devices. This is expected behaviour.

Use VDE or one of the non-TAP based networking options if running as non-root