Bug 986122
| Summary: | SELinux is preventing /usr/sbin/useradd from using the 'sys_chroot' capabilities. | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Jon Disnard <jdisnard> |
| Component: | selinux-policy | Assignee: | Miroslav Grepl <mgrepl> |
| Status: | CLOSED ERRATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 19 | CC: | dominick.grift, dwalsh, mgrepl |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Unspecified | ||
| Whiteboard: | abrt_hash:77f238bde52584a98aca4c372b3b9f72b959af3b95d0847de8f8a7fca6904989 | ||
| Fixed In Version: | selinux-policy-3.12.1-66.fc19 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2013-07-26 23:05:37 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: | |||
commit f6367a3649b2e2e957df2cba67f4b5ea2ec297ce
Author: Miroslav Grepl <mgrepl>
Date: Fri Jul 19 09:44:54 2013 +0200
Allow sys_chroot for useradd_t
selinux-policy-3.12.1-66.fc19 has been submitted as an update for Fedora 19. https://admin.fedoraproject.org/updates/selinux-policy-3.12.1-66.fc19 Package selinux-policy-3.12.1-66.fc19: * should fix your issue, * was pushed to the Fedora 19 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing selinux-policy-3.12.1-66.fc19' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2013-13543/selinux-policy-3.12.1-66.fc19 then log in and leave karma (feedback). selinux-policy-3.12.1-66.fc19 has been pushed to the Fedora 19 stable repository. If problems still persist, please make note of it in this bug report. |
Description of problem: So I was manually crafting a fedora-arm live image for the beagle bone black. Part of my process involves creating a "liveuser" with useradd(8) and groupadd(8). What happens is an ext4 rootfs is loop-mounted on /mnt, and the rootfs manipulated. In this instance the useradd(8) cmd was used like so: # useradd -u 2333 -g 2333 -G 10 --root /mnt liveuser The work around was to manually chroot like so: # chroot /mnt useradd -u 2333 -g 2333 -G 10 liveuser SELinux is preventing /usr/sbin/useradd from using the 'sys_chroot' capabilities. Here is the cmdline that triggered the AVC: # useradd -u 2333 -g 2333 -G 10 --root /mnt liveuser Useradd(8) has --root (chroot) capability, which wants sys_chroot ability. Also groupadd(8) might be impacted the same way. Ran into this one when adding a "liveuser" to a rootfs mounted on /mnt. Want to leave selinux enabled on machines used to generate Fedora images or spins. ***** Plugin catchall (100. confidence) suggests *************************** If you believe that useradd should have the sys_chroot capability 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: # grep useradd /var/log/audit/audit.log | audit2allow -M mypol # semodule -i mypol.pp Additional Information: Source Context unconfined_u:unconfined_r:useradd_t:s0-s0:c0.c1023 Target Context unconfined_u:unconfined_r:useradd_t:s0-s0:c0.c1023 Target Objects [ capability ] Source useradd Source Path /usr/sbin/useradd Port <Unknown> Host (removed) Source RPM Packages shadow-utils-4.1.5.1-5.fc19.x86_64 Target RPM Packages Policy RPM selinux-policy-3.12.1-63.fc19.noarch Selinux Enabled True Policy Type targeted Enforcing Mode Permissive Host Name (removed) Platform Linux (removed) 3.9.9-302.fc19.x86_64 #1 SMP Sat Jul 6 13:41:07 UTC 2013 x86_64 x86_64 Alert Count 1 First Seen 2013-07-15 16:02:35 CDT Last Seen 2013-07-15 16:02:35 CDT Local ID 66d08c43-efca-41fd-bbca-21103ece3487 Raw Audit Messages type=AVC msg=audit(1373922155.580:389): avc: denied { sys_chroot } for pid=16170 comm="useradd" capability=18 scontext=unconfined_u:unconfined_r:useradd_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:useradd_t:s0-s0:c0.c1023 tclass=capability type=SYSCALL msg=audit(1373922155.580:389): arch=x86_64 syscall=chroot success=yes exit=0 a0=7fff822d370a a1=0 a2=0 a3=7f0fd804a2e0 items=0 ppid=2970 pid=16170 auid=80870 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 ses=1 tty=pts8 comm=useradd exe=/usr/sbin/useradd subj=unconfined_u:unconfined_r:useradd_t:s0-s0:c0.c1023 key=(null) Hash: useradd,useradd_t,useradd_t,capability,sys_chroot Additional info: reporter: libreport-2.1.5 hashmarkername: setroubleshoot kernel: 3.9.9-302.fc19.x86_64 type: libreport