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Bug 740702 - update floppy disk on the fly with <readonly/> failed when selinux is enforcing
Summary: update floppy disk on the fly with <readonly/> failed when selinux is enforcing
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: libvirt
Version: 6.2
Hardware: x86_64
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Laine Stump
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2011-09-23 02:37 UTC by weizhang
Modified: 2011-11-23 18:57 UTC (History)
7 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2011-11-23 18:57:33 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description weizhang 2011-09-23 02:37:59 UTC 
Description of problem:
When selinux is enforcing, update floppy disk on the fly with <readonly/> failed with error
error: Failed to update device from floppy.xml
error: internal error unable to execute QEMU command 'change': Could not open '/var/lib/libvirt/images/fd2.img'

but when selinux is permissive, update-device will success

Version-Release number of selected component (if applicable):
kernel-2.6.32-197.el6.x86_64
qemu-kvm-0.12.1.2-2.192.el6.x86_64
libvirt-0.9.4-12.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Make 2 floppy disk image file

# dd if=/dev/zero of=/var/lib/libvirt/images/fd1.img count=1024 bs=1024

# mkfs.ext3 /var/lib/libvirt/images/fd1.img

# dd if=/dev/zero of=/var/lib/libvirt/images/fd1.img count=1024 bs=1024

# mkfs.ext3 /var/lib/libvirt/images/fd2.img

2. Define a domain with floppy device connected with in config xml file

    <disk type='file' device='floppy'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/fd1.img'/>
      <target dev='fda' bus='fdc'/>
      <readonly/>
    </disk>

3. Start the domain

4. Prepare a xml as flollowing:

# cat floppy.xml
    <disk type='file' device='floppy'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/fd2.img'/>
      <target dev='fda' bus='fdc'/>
      <readonly/>
    </disk>

5. Try to update the media int floppy device

# virsh update-device rhel6 floppy.xml
  
Actual results:
error: Failed to update device from floppy.xml
error: internal error unable to execute QEMU command 'change': Could not open '/var/lib/libvirt/images/fd2.img'

Expected results:
success with no error

Additional info:
Comment 4 Dave Allan 2011-11-23 18:57:33 UTC 
A user can work around this problem by making the floppy writable by removing the readonly element from the XML.
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