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Bug 1637416 - RHVH 4.2.7: AVC denied errors (getattr) in audit.log after register to engine
Summary: RHVH 4.2.7: AVC denied errors (getattr) in audit.log after register to engine
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.6
Hardware: Unspecified
OS: Linux
high
high
Target Milestone: rc
: 7.6
Assignee: Lukas Vrabec
QA Contact: Milos Malik
URL:
Whiteboard:
: 1649077 (view as bug list)
Depends On:
Blocks: 1645271 1653106
TreeView+ depends on / blocked
 
Reported: 2018-10-09 08:53 UTC by cshao
Modified: 2022-03-13 15:42 UTC (History)
21 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 1645271 (view as bug list)
Environment:
Last Closed: 2019-08-06 12:52:32 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
all log (10.91 MB, application/x-gzip)
2018-10-09 08:53 UTC, cshao 		no flags Details
View All


Links
System ID Private Priority Status Summary Last Updated
Github SELinuxProject refpolicy pull 2 0 None closed sysstat: allow sysstat_t to getattr on mountpoints 2020-02-19 03:09:03 UTC
Red Hat Knowledge Base (Solution) 3689791 0 None None None 2018-11-22 19:59:50 UTC
Red Hat Product Errata RHBA-2019:2127 0 None None None 2019-08-06 12:53:15 UTC

Description cshao 2018-10-09 08:53:43 UTC 
Created attachment 1491997 [details]
all log

Description of problem:
After register to engine, there are AVC denied errors (getattr) in audit.log.

Version-Release number of selected component (if applicable):
RHVH-4.2-20181004.3-RHVH-x86_64-dvd1.iso
imgbased-1.0.25-1.el7ev.noarch
selinux-policy-3.13.1-229.el7.noarch

How reproducible:
80%

Steps to Reproduce:
1. RHVH-4.2-20181004.3-RHVH-x86_64-dvd1.iso installed successful. selinux in enforcing mode as default.
2. Register RHVH to RHVM.
3. Login to RHVH.

# grep "avc:  denied" /var/log/audit/audit.log
type=AVC msg=audit(1539074401.555:1207): avc:  denied  { getattr } for  pid=29850 comm="sadc" path="/var/log/audit" dev="dm-6" ino=2 scontext=system_u:system_r:sysstat_t:s0-s0:c0.c1023 tcontext=system_u:object_r:auditd_log_t:s0 tclass=dir permissive=0


Actual results:
AVC denied error msgs in audit.log

Expected results:
No avc denied errors in audit.log.

Additional info:
Comment 1 Yuval Turgeman 2018-10-11 13:52:08 UTC 
It looks like a platform bug - does this happen on RHEL-H as well ?
Comment 2 cshao 2018-10-12 09:07:53 UTC 
(In reply to Yuval Turgeman from comment #1)
> It looks like a platform bug - does this happen on RHEL-H as well ?

Yes, but there are a few differences on RHEL-H.

# grep "avc:  denied" /var/log/audit/audit.log
type=AVC msg=audit(1539331410.911:1741): avc:  denied  { sendto } for  pid=1565 comm="chronyd" path="/run/chrony/chronyc.20590.sock" scontext=system_u:system_r:chronyd_t:s0 tcontext=system_u:system_r:virtd_t:s0-s0:c0.c1023 tclass=unix_dgram_socket
Comment 4 Yuval Turgeman 2018-10-14 17:46:31 UTC 
Ok I've just reproduced this on a RHEL system - it is indeed a platform bug, to reproduce this, you need to install the operating system with /var/log/audit mounted on a separate partition, then you will start seeing those denials.  Is this a known issue ?
Comment 20 cshao 2018-11-14 07:10:34 UTC 
Still met this issue with RHVH 4.2.7 async build
Comment 22 James Ralston 2018-11-14 18:18:40 UTC 
If /var/log/audit is a separate filesystem, simply installing the sysstat package will also show the problem. From BZ#1649077:

$ ausearch -m avc -ts today | audit2allow 

#============= sysstat_t ==============

allow sysstat_t auditd_log_t:dir getattr;

Note that the RHEL7 STIG requires /var/log/audit to be a separate filesystem:

https://stigviewer.com/stig/red_hat_enterprise_linux_7/2017-12-14/finding/V-72063

Therefore, all sites that must run STIG-compliant RHEL7 hosts are going to be bitten by this.

At least for now, we're only seeing this for sysstat_t, so we've rolled another tunable into our local policy to permit us to work around the issue:

## <desc>
##  <p>
##    Work around auditd_log_t denials (BZ#1637416).
##  </p>
## </desc>

gen_tunable(local_custom_auditd_log_getattr, true)

gen_require(`
    type auditd_log_t;
    type sysstat_t;
    class dir { getattr };
')

tunable_policy(`local_custom_auditd_log_getattr',`
    allow sysstat_t auditd_log_t:dir getattr;
')
Comment 27 Zdenek Pytela 2019-03-06 17:35:12 UTC 
*** Bug 1649077 has been marked as a duplicate of this bug. ***
Comment 30 errata-xmlrpc 2019-08-06 12:52:32 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-2019:2127
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