Bug 2230856
| Summary: | MLS: kmod-static-nodes.service fails at boot due to a AVC popping up | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 9 | Reporter: | Renaud Métrich <rmetrich> |
| Component: | selinux-policy | Assignee: | Nikola Knazekova <nknazeko> |
| Status: | NEW --- | QA Contact: | BaseOS QE Security Team <qe-baseos-security> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 9.2 | CC: | lvrabec, mmalik, zpytela |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 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: | |||
Description of problem: After switching the system from Targeted to MLS, relabelling while in permissive and switching back to Enforcing, we can see that kmod-static-nodes.service fails during boot due to hidden AVC: ~~~ # systemctl --failed UNIT LOAD ACTIVE SUB DESCRIPTION ● kmod-static-nodes.service loaded failed failed Create List of Static Device Nodes # systemctl status kmod-static-nodes.service [...] Aug 10 09:06:03 vm-mls9 systemd[1]: Starting Create List of Static Device Nodes... Aug 10 09:06:03 vm-mls9 kmod[655]: Error: could not create /run/tmpfiles.d/static-nodes.conf - Permission denied Aug 10 09:06:03 vm-mls9 systemd[1]: kmod-static-nodes.service: Main process exited, code=exited, status=1/FAILURE Aug 10 09:06:03 vm-mls9 systemd[1]: kmod-static-nodes.service: Failed with result 'exit-code'. Aug 10 09:06:03 vm-mls9 systemd[1]: Failed to start Create List of Static Device Nodes. ~~~ AVC (not showing without dontaudit rules): ~~~ type=PROCTITLE msg=audit(08/10/2023 09:16:26.228:147) : proctitle=/usr/bin/kmod static-nodes --format=tmpfiles --output=/run/tmpfiles.d/static-nodes.conf type=SYSCALL msg=audit(08/10/2023 09:16:26.228:147) : arch=x86_64 syscall=openat success=no exit=EACCES(Permission denied) a0=AT_FDCWD a1=0x7fff817c3f24 a2=O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC a3=0x1b6 items=0 ppid=1 pid=1208 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=kmod exe=/usr/bin/kmod subj=system_u:system_r:kmod_t:s0-s15:c0.c1023 key=(null) type=AVC msg=audit(08/10/2023 09:16:26.228:147) : avc: denied { write } for pid=1208 comm=kmod name=static-nodes.conf dev="tmpfs" ino=56 scontext=system_u:system_r:kmod_t:s0-s15:c0.c1023 tcontext=system_u:object_r:var_run_t:s0 tclass=file permissive=0 ~~~ Version-Release number of selected component (if applicable): selinux-policy-mls-38.1.11-2.el9_2.3.noarch How reproducible: Always in MLS