Red Hat Bugzilla – Bug 1312570
[Security] SELinux troubleshoot instructions outdated for journalctl
Last modified: 2016-12-20 14:04:06 EST
Description of problem:
SELinux troubleshooting instruction provided with (at least) Fedora 23 are outdated.
They are not compatible with journalctl when it comes to adjust the policy.
Not fixing this issue may lead to a lot of bug reporting noise and confusion with security-wise wrong solutions, as illustrated in this bug related to Firefox/Thunderbird plugins accesses:
Probably many users end up disabling SELinux or applying dangerous unconfined tags.
Steps to Reproduce:
Just get any SELinux alert and follow the instruction to adjust the system policy.
Outdated instructions look like that :
# grep npviewer.bin /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp
If you apply the recommended instruction, of course, nothing happens.
Because of stdout piping, it leads to a silent error, but the grep command fails as now logs are in binary format :
# grep npviewer.bin /var/log/audit/audit.log
Fichier binaire /var/log/audit/audit.log correspondant
SELinux is not an easy beast, so instructions should be clear and straightforward, so that false-positive don't trigger all the time.
Instead, a command compatible with journalctl would look like that (could probably be improved):
# journalctl | grep -i "denied.*npviewer" | head -n 1 | audit2allow -M mypol
# semodule -i mypol.pp
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Fedora 23 changed to end-of-life (EOL) status on 2016-12-20. Fedora 23 is
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