Bug 1888912

Summary:	SELinux policy change not visible to systemd until daemon-reexec
Product:	Red Hat Enterprise Linux 8	Reporter:	Maciek Borzecki <maciek.borzecki>
Component:	systemd	Assignee:	David Tardon <dtardon>
Status:	CLOSED ERRATA	QA Contact:	Frantisek Sumsal <fsumsal>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	8.1	CC:	dtardon, jamacku, systemd-maint-list
Target Milestone:	rc	Keywords:	Triaged
Target Release:	8.0
Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:	systemd-239-44.el8	Doc Type:	If docs needed, set a value
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Last Closed:	2021-05-18 14:54:22 UTC	Type:	Bug
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Embargoed:

Description Maciek Borzecki 2020-10-16 08:36:02 UTC

Description of problem:

When SELinux policy loading modules that modify the allow rules for init_t, a daemon-reexec is needed for those rules to be applied. This is a duplicate of https://bugzilla.redhat.com/show_bug.cgi?id=1197886 which was fixed systemd v245 in Fedora.

Version-Release number of selected component (if applicable):
systemd-239-31.el8_2.2.x86_64


How reproducible:
always


Steps to Reproduce:
1. install snapd from epel-8 (pulls in snapd-selinux)
2. install the lxd snap, a socket service for the snap is created during the install, the install fails
3. observe the following denial: avc:  denied  { create } for  pid=1 comm="systemd" name="unix.socket" scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:var_t:s0 tclass=sock_file permissive=0
4. the rule is allowed by snapd-selinux module
5. run systemctl daemon-reexec
6. successfuly install the lxd snap again

Comment 1 David Tardon 2020-11-26 11:48:49 UTC

Note: I cannot try this on 8.2 because snapd--or, rather, snapd-selinux--cannot be installed due to a version clash with selinux-policy. And I cannot reproduce it on 8.3...

Comment 2 Lukáš Nykrýn 2021-01-25 14:02:00 UTC

fix merged to github master branch -> https://github.com/systemd-rhel/rhel-8/pull/140

Comment 9 errata-xmlrpc 2021-05-18 14:54:22 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 (Moderate: systemd security, bug fix, and enhancement update), 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/RHSA-2021:1611