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Bug 1490956 - PostgreSQL fails to start under SELinux MLS
Summary: PostgreSQL fails to start under SELinux MLS
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.3
Hardware: All
OS: Linux
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Lukas Vrabec
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-09-12 15:04 UTC by Dustin C. Hatch
Modified: 2018-04-10 12:42 UTC (History)
5 users (show)

Fixed In Version: selinux-policy-3.13.1-175.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2018-04-10 12:42:01 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2018:0763 0 None None None 2018-04-10 12:42:56 UTC

Description Dustin C. Hatch 2017-09-12 15:04:28 UTC 
Description of problem:
When the system is using the MSL SELinux policy, the postgresql.service unit fails to start:

ExecStartPre=/usr/bin/postgresql-check-db-dir ${PGDATA} (code=exited, status=1/FAILURE)

The problem is this AVC:

type=AVC msg=audit(1505225522.279:9675648): avc:  denied  { getattr } for  pid=14486 comm="postgresql-chec" path="/var/lib/pgsql/data/PG_VERSION" dev="dm-0" ino=135 scontext=system_u:system_r:init_t:s0-s15:c0.c1023 tcontext=system_u:object_r:postgresql_db_t:s0 tclass=file

Version-Release number of selected component (if applicable):
postgresql-9.2.18-1.el7.x86_64
selinux-policy-mls-3.13.1-102.el7_3.16.noarch

How reproducible:
Always


Steps to Reproduce:
1. Enable SELinux MLS
2. Start postgresql.service

Actual results:
PostgreSQL fails to start because postgresql-check-db-dir does not run

Expected results:
postgresql-check-db-dir should execute successfully even under SELinux MLS, and postgresql should start

Additional info:
Fixing this problem is trivial:
chcon -t postgresql_exec_t /usr/bin/postgresql-check-db-dir
Comment 3 Milos Malik 2018-02-14 09:34:37 UTC 
# sestatus 
SELinux status:                 enabled
SELinuxfs mount:                /sys/fs/selinux
SELinux root directory:         /etc/selinux
Loaded policy name:             mls
Current mode:                   enforcing
Mode from config file:          permissive
Policy MLS status:              enabled
Policy deny_unknown status:     denied
Max kernel policy version:      31
# service postgresql start
Redirecting to /bin/systemctl start postgresql.service
# ps -efZ | grep postgres
system_u:system_r:postgresql_t:s0-s15:c0.c1023 postgres 1746 1  0 04:31 ? 00:00:00 /usr/bin/postgres -D /var/lib/pgsql/data -p 5432
system_u:system_r:postgresql_t:s0-s15:c0.c1023 postgres 1747 1746  0 04:31 ? 00:00:00 postgres: logger process   
system_u:system_r:postgresql_t:s0-s15:c0.c1023 postgres 1749 1746  0 04:31 ? 00:00:00 postgres: checkpointer process   
system_u:system_r:postgresql_t:s0-s15:c0.c1023 postgres 1750 1746  0 04:31 ? 00:00:00 postgres: writer process   
system_u:system_r:postgresql_t:s0-s15:c0.c1023 postgres 1751 1746  0 04:31 ? 00:00:00 postgres: wal writer process   
system_u:system_r:postgresql_t:s0-s15:c0.c1023 postgres 1752 1746  0 04:31 ? 00:00:00 postgres: autovacuum launcher process   
system_u:system_r:postgresql_t:s0-s15:c0.c1023 postgres 1753 1746  0 04:31 ? 00:00:00 postgres: stats collector process   
root:sysadm_r:sysadm_t:s0       root      1756  1296  0 04:31 pts/0    00:00:00 grep --color=auto postgres
# matchpathcon /usr/bin/postgresql-check-db-dir 
/usr/bin/postgresql-check-db-dir	system_u:object_r:postgresql_exec_t:s0
# rpm -qa selinux-policy\* | sort
selinux-policy-3.13.1-189.el7.noarch
selinux-policy-mls-3.13.1-189.el7.noarch
selinux-policy-targeted-3.13.1-189.el7.noarch
#
Comment 7 errata-xmlrpc 2018-04-10 12:42:01 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-2018:0763
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