Bug 1951323
| Summary: | SELinux is preventing kexec from read access on the file initramfs-5.10.19-200.fc33.x86_64kdump.img | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Kelvin Fan <kfan> |
| Component: | selinux-policy | Assignee: | Zdenek Pytela <zpytela> |
| Status: | CLOSED ERRATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 33 | CC: | dwalsh, grepl.miroslav, kasong, ltao, lvrabec, mmalik, omosnace, plautrba, smilner, vmojzis, zpytela |
| Target Milestone: | --- | Keywords: | Triaged |
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | selinux-policy-3.14.6-38.fc33 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2021-06-16 01:07:20 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: | |||
I've submitted a draft Fedora PR to address the issue: https://github.com/fedora-selinux/selinux-policy/pull/732 This commit assigned a new type to files in /var/lib/kdump. Kairui Song, do you happen to know which additional system services need the access, either read or write, to /var/lib/kdump/initramfs* image files? Hi, currently there are two services that need rw access to /var/lib/kdump/initramfs* image files. One is kdump.service, another is when dnf updates kernel package, a kernel install hook "/lib/kernel/install.d/60-kdump.install" will get triggered and delete unused images. (In reply to Kairui Song from comment #2) > Hi, currently there are two services that need rw access to > /var/lib/kdump/initramfs* image files. One is kdump.service, another is when > dnf updates kernel package, a kernel install hook > "/lib/kernel/install.d/60-kdump.install" will get triggered and delete > unused images. Thank you, I've updated the PR accordingly and undrafted it. FEDORA-2021-e2de9e9e55 has been submitted as an update to Fedora 33. https://bodhi.fedoraproject.org/updates/FEDORA-2021-e2de9e9e55 FEDORA-2021-e2de9e9e55 has been pushed to the Fedora 33 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --advisory=FEDORA-2021-e2de9e9e55` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2021-e2de9e9e55 See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates. FEDORA-2021-e2de9e9e55 has been pushed to the Fedora 33 stable repository. If problem still persists, please make note of it in this bug report. |
Description of problem: SELinux is preventing kdump from loading its generated initrd if `kdump` places its generated initrd in `/var/lib/kdump`, as may soon be the case for when `kdump` cannot place its generated initrd in the usual `/boot` on systems where `/boot` is mounted read-only, such as Fedora/RHEL CoreOS. The default SELinux policies for `kdump`/`kexec` may need to be modified to address this. The following is the `sealert` output from a build of Fedora CoreOS (which has `/boot` read-only) after `kdump` attempts to load the `kdump`-generated initrd placed at `/var/lib/kdump`: ``` SELinux is preventing kexec from read access on the file initramfs-5.10.19-200.fc33.x86_64kdump.img. ***** Plugin catchall_labels (83.8 confidence) suggests ******************* If you want to allow kexec to have read access on the initramfs-5.10.19-200.fc33.x86_64kdump.img file Then you need to change the label on initramfs-5.10.19-200.fc33.x86_64kdump.img Do # semanage fcontext -a -t FILE_TYPE 'initramfs-5.10.19-200.fc33.x86_64kdump.img' where FILE_TYPE is one of the following: NetworkManager_tmp_t, abrt_helper_exec_t, abrt_tmp_t, abrt_upload_watch_tmp_t, abrt_var_cache_t, abrt_var_run_t, admin_crontab_tmp_t, afs_cache_t, al. Then execute: restorecon -v 'initramfs-5.10.19-200.fc33.x86_64kdump.img' ***** Plugin catchall (17.1 confidence) suggests ************************** If you believe that kexec should be allowed read access on the initramfs-5.10.19-200.fc33.x86_64kdump.img file by default. Then you should report this as a bug. You can generate a local policy module to allow this access. Do allow this access for now by executing: # ausearch -c 'kexec' --raw | audit2allow -M my-kexec # semodule -X 300 -i my-kexec.pp Additional Information: Source Context system_u:system_r:kdump_t:s0 Target Context system_u:object_r:var_lib_t:s0 Target Objects initramfs-5.10.19-200.fc33.x86_64kdump.img [ file ] Source kexec Source Path kexec Port <Unknown> Host <Unknown> Source RPM Packages Target RPM Packages SELinux Policy RPM selinux-policy-targeted-3.14.6-36.fc33.noarch Local Policy RPM <Unknown> Selinux Enabled True Policy Type targeted Enforcing Mode Enforcing Host Name cosa-devsh Platform Linux cosa-devsh 5.10.19-200.fc33.x86_64 #1 SMP Fri Feb 26 16:21:30 UTC 2021 x86_64 x86_64 Alert Count 2 First Seen 2021-04-19 21:27:43 UTC Last Seen 2021-04-19 21:33:04 UTC Local ID 5ec95c86-81bf-4add-be38-5b46ac9fe88c Raw Audit Messages type=AVC msg=audit(1618867984.25:148): avc: denied { read } for pid=1188 comm="kexec" name="initramfs-5.10.19-200.fc33.x86_64kdump.img" dev="vda4" ino=23069869 scontext=system_u:system_r:0 Hash: kexec,kdump_t,var_lib_t,file,read ```