Bug 359631
| Summary: | KVM guest NFS mount to host AVC denial | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Warren Togami <wtogami> |
| Component: | selinux-policy | Assignee: | Daniel Walsh <dwalsh> |
| Status: | CLOSED CURRENTRELEASE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | low | Docs Contact: | |
| Priority: | low | ||
| Version: | rawhide | CC: | berrange, katzj, steved |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Current | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2008-01-30 19:18:56 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: | |||
| Bug Depends On: | |||
| Bug Blocks: | 188611 | ||
Are you exporting the server's /dev over NFS? Because that's what it looks like and that's almost certainly something you _don't_ want to do as it would let the LTSP clients muck with things in /dev of the server Well what is /dev/kvm? It is not labeled. I have no idea what to label it. Do we need a new type? It's the device used for communication between kvm userspace and kernel. And since we're not currently doing anything to confine kvm, having it as device_t is reasonable. Ok I added a kvm_device_t to selinux-policy-3.0.8-43.fc8 Most domains can not look at device_t so it will generate avc;s if not just for getattr types. I don't see why rpc.mounted is trying to open /dev/kvm at all. It has no business touching that whatsoever. It smells like a leaked file descriptor to me. leaked file descriptor from what? Note: This doesn't actually prevent NFS from working. This is most likely rpc.mountd doing a getattr on evey chr_file in /dev. If it does the equivalent of ls -lZ /dev, you will get this getattr violation. Existing selinux policy has dev_dontaudit_getattr_all_blk_files(nfsd_t) dev_dontaudit_getattr_all_chr_files(nfsd_t) The problem is device_t was not considered a valid label for a chr_file so these dontaudit lines did not take effect. Bulk closing all bugs in Fedora updates in the modified state. If you bug is not fixed, please reopen. |
qemu-kvm invoked manually: qemu-kvm -hda /dev/null -boot n -net nic -net tap,/etc/qemu-ifup It NFS mounts mounts its root filesystem from a chroot on the host. Mount seemingly works enough for the thin client to operate, but during operation I see this AVC denial on the host. type=AVC msg=audit(1193803835.861:74): avc: denied { getattr } for pid=2153 comm="rpc.mountd" path="/dev/kvm" dev=tmpfs ino=5849 scontext=system_u:system_r:nfsd_t:s0 tcontext=system_u:object_r:device_t:s0 tclass=chr_file kvm-36-7.fc8 selinux-policy-3.0.8-42.fc8