Bug 1317046
| Summary: | the sandbox -i [path] command stopped working | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | w.chimiak |
| Component: | policycoreutils | Assignee: | Petr Lautrbach <plautrba> |
| Status: | CLOSED ERRATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | high | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 23 | CC: | dwalsh, mgrepl, mvyynqbgerqungqbgpbz.yeuhc, plautrba |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | policycoreutils-2.5-17.fc25 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2016-10-10 17:43:59 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: | |||
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Description
w.chimiak
2016-03-11 18:55:59 UTC
I can reproduce this, but only for files which are not in /tmp/. Moving files into a temporary directory on /tmp makes things work.
What did you do:
cd
sandbox -X -i myfile2.doc xdg-open myfile2.doc
What happened:
xdg-open: no permission to read file '/home/mikedlr/myfile2.doc'
What did you expect to happen:
Sandbox should open the file
Any other information:
$ ls -Z myfile2.doc
unconfined_u:object_r:user_home_t:s0 myfile2.doc
The audit2why output looks like:
type=AVC msg=audit(1466013139.499:35191): avc: denied { read } for pid=23595 comm="xdg-open" name=4A6F62204465736372697074696F6E202D204E65744F707320456E67696E6565722E646F6378 dev="tmpfs" ino=12073273 scontext=unconfined_u:unconfined_r:sandbox_x_t:s0:c4,c1012 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=0
Was caused by:
Missing type enforcement (TE) allow rule.
My suspicion is that this is because the files are on a tmpfs and sandbox has very limited access to files on a tmpfs.
I think the solution is either to widen the access or have the -i option automatically change the context of files as they are copied in and out of the temporary homedir.
In any case, this makes a number of important uses of the sandbox not work.
BTW my reproduction of this bug is for policycoreutils-2.4-21.fc23.x86_64 $ rpm -qi policycoreutils Name : policycoreutils Version : 2.4 Release : 21.fc23 Architecture: x86_64 Install Date: Fri 27 May 2016 23:12:30 BST comment to this from the selinux mailing list (part of this mail https://marc.info/?l=selinux&m=146662101919943&w=2) The files passed to -i should be copied into the temporary sandbox directory and inherit its context, not be labeled with the context of the original file. Oddly, I see different behaviors here for F23 vs rawhide when using e.g. sandbox -M -i /path/to/file /bin/bash and then ls -Z /path/to/file. I assume, based on that, there's a bug in Fedora 23 SELinux policy? This is also reported upstream at https://github.com/SELinuxProject/selinux/issues/16 checkpolicy-2.5-8.fc25, libselinux-2.5-12.fc25, libsemanage-2.5-8.fc25, libsepol-2.5-10.fc25, policycoreutils-2.5-17.fc25 has been pushed to the Fedora 25 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-b7e8e980ef checkpolicy-2.5-8.fc25, libselinux-2.5-12.fc25, libsemanage-2.5-8.fc25, libsepol-2.5-10.fc25, policycoreutils-2.5-17.fc25, secilc-2.5-6.fc25 has been pushed to the Fedora 25 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-b7e8e980ef checkpolicy-2.5-8.fc25, libselinux-2.5-12.fc25, libsemanage-2.5-8.fc25, libsepol-2.5-10.fc25, policycoreutils-2.5-17.fc25, secilc-2.5-6.fc25 has been pushed to the Fedora 25 stable repository. If problems still persist, please make note of it in this bug report. |