Bug 1508336
| Summary: | Starting openvswitch.service causes AVC denials to be logged | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Jan Pazdziora (Red Hat) <jpazdziora> |
| Component: | openvswitch | Assignee: | Aaron Conole <aconole> |
| Status: | CLOSED CURRENTRELEASE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 27 | CC: | aconole, apevec, brad.inch, chrisw, fleitner, jpazdziora, mpitt, tgraf, tredaelli |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2018-11-27 22:26:08 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: | |||
Note that on Fedora 26, the AVC denials are different: bug 1508337. There is a very similar issue, with systemd being denied map access to modules.dep.bin. I filed this as bug 1513399, it's most probably wrong against openvswitch. I actually think that the fix belongs to the openvswitch component since that modprobe shouldn't be run with the openvswitch_t context -- that should most probably be done via domain-transitioned helper script that the openvswitch should ship. (In reply to Jan Pazdziora from comment #4) Could you elaborate more? To reduce the attack vectors, my preference would be to separate various security relevant operations (of which loading kernel module most likely is) into separate SELinux domains (contexts), rather than merely adding allows to existing openvswitch_t. It would also make the audit easier. That makes perfect sense. I was looking for more details about the domain-transitioned helper script. I think ovs-ctl script used by systemd ovs-vswitchd.service will load the module before starting the ovs-vswitchd daemon. Maybe that can be done ExecStartPre? https://danwalsh.livejournal.com/23944.html talks about domain transitioning in general. I'm not familiar with the overall openvswitch setup / startup to say which service / script would be the best place for it. Is there any progress with the investigation? https://github.com/orgcandman/ovs/tree/systemd_enhancements This branch contains the proposal for the domain-transitioned helper script. I need to clean up the commits and then submit it upstream. Once it's accepted we can bring it back. Submitted upstream https://mail.openvswitch.org/pipermail/ovs-dev/2018-March/345333.html *** Bug 1508337 has been marked as a duplicate of this bug. *** This message is a reminder that Fedora 27 is nearing its end of life. On 2018-Nov-30 Fedora will stop maintaining and issuing updates for Fedora 27. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a Fedora 'version' of '27'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora 27 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora, you are encouraged change the 'version' to a later Fedora version prior this bug is closed as described in the policy above. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete. This does not happen any more since Fedora 28. To cross-reference, the problem is back in slightly different form in Fedora 30, bug 1751793. |
Description of problem: When openvswitch.service is started, AVC denials about openvswitch_t are logged. Version-Release number of selected component (if applicable): openvswitch-2.8.1-1.fc27.x86_64 selinux-policy-3.13.1-283.14.fc27.noarch kernel-4.13.8-300.fc27.x86_64 How reproducible: Deterministic. Steps to Reproduce: 1. systemctl start openvswitch 2. Check the audit.log. Actual results: type=AVC msg=audit(1509463697.530:159): avc: denied { map } for pid=12682 comm="modprobe" path="/usr/lib/modules/4.13.8-300.fc27.x86_64/modules.dep.bin" dev="dm-0" ino=246255 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:modules_object_t:s0 type=AVC msg=audit(1509463697.538:160): avc: denied { module_load } for pid=12682 comm="modprobe" scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:system_r:openvswitch_t:s0 tclass=system permissive=0 Expected results: No AVC denials. Additional info: