Bug 2478116
| Summary: | SELinux: kiwi %post unnecessarily labels symlinks with install_exec_t, causing lsmd AVC denials | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Alejandro <alejandroperezpestana99> |
| Component: | kiwi | Assignee: | Neal Gompa <ngompa13> |
| Status: | CLOSED ERRATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | medium | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 45 | CC: | davide, michel, ngompa13 |
| Target Milestone: | --- | Keywords: | Regression, SELinux |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | kiwi-11.0.2-1.fc45 kiwi-11.0.2-1.el10_3 kiwi-11.0.2-1.el10_4 kiwi-11.0.2-1.fc43 kiwi-11.0.2-1.el10_2 kiwi-11.0.2-1.fc44 | Doc Type: | --- |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2026-09-19 00:17:36 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: | |||
This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle. Changing version to 45. FEDORA-EPEL-2026-75cc6afd67 (kiwi-11.0.2-1.el10_2) has been submitted as an update to Fedora EPEL 10.2. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-75cc6afd67 FEDORA-2026-a325558d3a (kiwi-11.0.2-1.fc45) has been submitted as an update to Fedora 45. https://bodhi.fedoraproject.org/updates/FEDORA-2026-a325558d3a FEDORA-2026-608c092987 (kiwi-11.0.2-1.fc44) has been submitted as an update to Fedora 44. https://bodhi.fedoraproject.org/updates/FEDORA-2026-608c092987 FEDORA-EPEL-2026-e12e5f4f1f (kiwi-11.0.2-1.el10_3) has been submitted as an update to Fedora EPEL 10.3. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-e12e5f4f1f FEDORA-EPEL-2026-8405851a97 (kiwi-11.0.2-1.el10_4) has been submitted as an update to Fedora EPEL 10.4. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-8405851a97 FEDORA-2026-94ae6cb693 (kiwi-11.0.2-1.fc43) has been submitted as an update to Fedora 43. https://bodhi.fedoraproject.org/updates/FEDORA-2026-94ae6cb693 FEDORA-2026-a325558d3a (kiwi-11.0.2-1.fc45) has been pushed to the Fedora 45 stable repository. If problem still persists, please make note of it in this bug report. FEDORA-EPEL-2026-e12e5f4f1f (kiwi-11.0.2-1.el10_3) has been pushed to the Fedora EPEL 10.3 stable repository. If problem still persists, please make note of it in this bug report. FEDORA-EPEL-2026-8405851a97 (kiwi-11.0.2-1.el10_4) has been pushed to the Fedora EPEL 10.4 stable repository. If problem still persists, please make note of it in this bug report. FEDORA-2026-94ae6cb693 (kiwi-11.0.2-1.fc43) has been pushed to the Fedora 43 stable repository. If problem still persists, please make note of it in this bug report. FEDORA-EPEL-2026-75cc6afd67 (kiwi-11.0.2-1.el10_2) has been pushed to the Fedora EPEL 10.2 stable repository. If problem still persists, please make note of it in this bug report. FEDORA-2026-608c092987 (kiwi-11.0.2-1.fc44) has been pushed to the Fedora 44 stable repository. If problem still persists, please make note of it in this bug report. |
kiwi's %post cli labels /usr/bin/kiwi and /usr/bin/kiwi-ng symlinks as install_exec_t. This causes AVC denials from lsmd (libStorageMgmt) which scans /usr/bin/ at boot and calls stat() on all entries. The lsmd_t policy allows getattr on exec_type:file but not lnk_file. Only the actual binary (/usr/bin/kiwi-ng-3) needs install_exec_t — SELinux resolves symlinks on exec, so the binary label is sufficient for domain transitions. Reproducible: Always Steps to Reproduce: sudo dnf install kiwi-cli sudo setenforce 1 sudo truncate -s 0 /var/log/audit/audit.log sudo systemctl restart libstoragemgmt sudo grep "denied.*lsmd" /var/log/audit/audit.log Actual Results: AVC denials are logged every time lsmd starts: type=AVC msg=audit(...): avc: denied { getattr } for comm="lsmd" path="/usr/bin/kiwi" scontext=system_u:system_r:lsmd_t:s0 tcontext=system_u:object_r:install_exec_t:s0 tclass=lnk_file type=AVC msg=audit(...): avc: denied { getattr } for comm="lsmd" path="/usr/bin/kiwi-ng" scontext=system_u:system_r:lsmd_t:s0 tcontext=system_u:object_r:install_exec_t:s0 tclass=lnk_file Expected Results: No AVC denials. The symlinks should have the default bin_t label since only the actual binary needs install_exec_t for domain transitions. Additional Information: - Introduced in commit c1ed67 ("Apply install_exec_t SELinux file context to kiwi executables") - The lsmd_t policy allows getattr on exec_type:file but not exec_type:lnk_file, so any process scanning /usr/bin/ will hit this - SELinux resolves symlinks on exec — labeling symlinks serves no security purpose - Tested fix on AL2023 and Fedora: only labeling kiwi-ng-3 eliminates denials while kiwi continues to work correctly in enforcing mode