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Bug 1686462 - allow httpd_t mailman_cgi_t:process signull
Summary: allow httpd_t mailman_cgi_t:process signull
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.0
Hardware: All
OS: Linux
low
low
Target Milestone: rc
: 8.2
Assignee: Lukas Vrabec
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On: 1682526
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-03-07 13:57 UTC by Alois Mahdal
Modified: 2020-04-28 16:40 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-04-28 16:40:34 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2020:1773 0 None None None 2020-04-28 16:40:49 UTC

Description Alois Mahdal 2019-03-07 13:57:12 UTC 
Description of problem
======================

When enabling Web UI for mailman, we get this AVC:

    type=PROCTITLE msg=audit(1551892512.795:1229): proctitle=2F7573722F7362696E2F6874747064002D44464F524547524F554E44
    type=SYSCALL msg=audit(1551892512.795:1229): arch=c000003e syscall=62 success=no exit=-13 a0=5bcc a1=0 a2=7ff008008a60 a3=7ff017e64520 items=0 ppid=23273 pid=23275 auid=4294967295 uid=48 gid=48 euid=48 suid=48 fsuid=48 egid=48 sgid=48 fsgid=48 tty=(none) ses=4294967295 comm="httpd" exe="/usr/sbin/httpd" subj=system_u:system_r:httpd_t:s0 key=(null)
    type=AVC msg=audit(1551892512.795:1229): avc:  denied  { signull } for  pid=23275 comm="httpd" scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:system_r:mailman_cgi_t:s0 tclass=process permissive=0

audit2allow:

    allow httpd_t mailman_cgi_t:process signull;


Version-Release number of selected component
============================================

selinux-policy-3.14.1-61.el8


How reproducible
================

Almost always


Steps to Reproduce
==================

Schedule /CoreOS/mailman/Sanity/dmarc-support-ui


Actual results
==============

Mentioned AVC


Expected results
================

No AVC.


Additional info
===============

Scheduled separately with permissive/enforcing

    https://beaker.engineering.redhat.com/matrix/?toggle_nacks_on=on&job_ids=3400604+3400601
Comment 1 Alois Mahdal 2019-03-07 16:19:56 UTC 
> 
> Scheduled separately with permissive/enforcing
> 
>    
> https://beaker.engineering.redhat.com/matrix/
> ?toggle_nacks_on=on&job_ids=3400604+3400601

Turns out this does not reproduce the AVC.  Here's another attempt, this time with the same compose as Tier where it was originally reproduced (instead of leaving it to Beaker):

    https://beaker.engineering.redhat.com/matrix/?toggle_nacks_on=on&job_ids=3400815+3400814
Comment 2 Alois Mahdal 2019-03-08 21:27:30 UTC 
Umm, for some reason even the second attempt did not reproduce it.  I'm out of ideas.

Note that at this point a workaround has been applied, so JFTR: third and further attempts would have to be accompanied by:

     distribution_hack__policy=skip

so that the hack (which adds ad-hoc module) would not be applied.
Comment 3 Nikola Knazekova 2019-07-25 08:25:55 UTC 
PR for Fedora: https://github.com/fedora-selinux/selinux-policy-contrib/pull/128
Comment 4 Lukas Vrabec 2019-07-29 11:32:35 UTC 
We have fixes in Fedora:

commit 36196ffa702f7e64b26c4fbde4fe4b71e00348d9 (HEAD -> rawhide, origin/rawhide, origin/HEAD)
Author: Nikola Knazekova <nknazeko>
Date:   Thu Jul 25 10:12:10 2019 +0200

    Allow httpd_t to signull mailman_cgi_t process
    
    Allow httpd_t to test for existence of mailman_cgi_t process without sending a signal.
Comment 13 errata-xmlrpc 2020-04-28 16:40:34 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:1773
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