Bug 2368360
| Summary: | Outdated selinux file labelling generates selinux alert | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | John Fawcett <john> |
| Component: | selinux-policy | Assignee: | Zdenek Pytela <zpytela> |
| Status: | CLOSED ERRATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | low | Docs Contact: | |
| Priority: | low | ||
| Version: | 42 | CC: | daan.j.demeyer, dwalsh, fedoraproject, lnykryn, lvrabec, mmalik, msekleta, omosnacek, pkoncity, suraj.ghimire7, systemd-maint, vmojzis, yuwatana, zbyszek, zpytela |
| Target Milestone: | --- | Flags: | zpytela:
mirror+
|
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | selinux-policy-41.43-1.fc42 | Doc Type: | --- |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2025-06-07 06:46:29 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: | |||
Just noticed while fixing on another system that above labelling did not work. Had to do semanage fcontext --add --type init_var_lib_t "/var/lib/systemd/random-seed" restorecon /var/lib/systemd/random-seed Yeah, there is some confusion here. I'm not sure why you'd have a file that is unlabelled. systemd-random-seed doesn't do anything special about the file: it rewrites the existing file in place, or opens it for writing if it doesn't exist yet. So the label should be created correctly. It seems that init_var_lib_t works, but random_seem_t seems more correct. There is an explicit policy for that context. I filed https://github.com/fedora-selinux/selinux-policy/pull/2712 to update the locations. FEDORA-2025-f9f097f491 (selinux-policy-41.43-1.fc42) has been submitted as an update to Fedora 42. https://bodhi.fedoraproject.org/updates/FEDORA-2025-f9f097f491 FEDORA-2025-f9f097f491 has been pushed to the Fedora 42 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2025-f9f097f491` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2025-f9f097f491 See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates. FEDORA-2025-f9f097f491 (selinux-policy-41.43-1.fc42) has been pushed to the Fedora 42 stable repository. If problem still persists, please make note of it in this bug report. |
Description of problem: ----------------------- following alert is generated at boot time after upgrade to fedora 42 type=AVC msg=audit(1748083304.513:71043): avc: denied { write } for pid=82926 comm="systemd-random-" name="random-seed" dev="sda5" ino=34945 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=file permissive=0 Version-Release number of selected component (if applicable): ------------------------------------------------------------- Name : systemd Epoch : 0 Version : 257.5 Release : 6.fc42 Architecture : i686 How reproducible: ----------------- I have this alert on two different systems and it is reproducible. Other systems don't give the alert. On systems where reproducible the label is: ls -lZ /var/lib/systemd/random-seed -rw------- 1 root root ? 512 May 19 16:05 /var/lib/systemd/random-seed On system where not reproducible the label is ls -lZ /var/lib/systemd/random-seed -rw-------. 1 root root system_u:object_r:init_var_lib_t:s0 32 May 19 15:51 /var/lib/systemd/random-seed Steps to Reproduce: ------------------- Reboot system and then run command ausearch -m avc Actual results: --------------- Result is the message shown above in bug description Expected results: ----------------- <no matches> Additional info: ---------------- solved by semanage fcontext --add --type random_seed_t "/var/lib/systemd/random-seed" restorecon var/lib/systemd/random-seed Label is now correct ls -lZ /var/lib/systemd/random-seed -rw-------. 1 root root system_u:object_r:random_seed_t:s0 512 May 24 13:00 /var/lib/systemd/random-seed Also prior to running the above I checked existing labelling specifications and it seems that the specifications include /usr/var/lib/random-seed which does not exist on the system. I therefore wonder if the location was changed to /usr/var/lib/systemd/random-seed without updating the selinux labelling. Potentially the labelling for the presumably old location /usr/var/lib/random-seed could be removed. semanage fcontext --list | grep random-seed /run/random-seed regular file system_u:object_r:initrc_var_run_t:s0 /usr/var/lib/random-seed all files system_u:object_r:random_seed_t:s0 /var/lib/random-seed all files system_u:object_r:random_seed_t:s0