Bug 1374820 - SELinux prevents systemd from accessing /run/systemd/inaccessible/blk
Summary: SELinux prevents systemd from accessing /run/systemd/inaccessible/blk
Keywords:
Status: CLOSED DUPLICATE of bug 1367280
Alias: None
Product: Fedora
Classification: Fedora
Component: selinux-policy
Version: 25
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Miroslav Grepl
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2016-09-09 18:06 UTC by Stef Walter
Modified: 2016-09-10 17:43 UTC (History)
7 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2016-09-10 17:43:45 UTC
Type: Bug
Embargoed:


Attachments (Terms of Use)

Description Stef Walter 2016-09-09 18:06:25 UTC
Description of problem:

While booting a Fedora 25 system we see these messages:

Sep 09 14:03:15 localhost.localdomain systemd[1]: Unable to fix SELinux security context of /run/systemd/inaccessible/blk: Permission denied
Sep 09 14:03:15 localhost.localdomain audit[1]: AVC avc:  denied  { getattr } for  pid=1 comm="systemd" path="/run/systemd/inaccessible/blk" dev="tmpfs" ino=9065 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:tmpfs_t:s0 tclass=blk_file permissive=0
Sep 09 14:03:15 localhost.localdomain audit[1]: AVC avc:  denied  { getattr } for  pid=1 comm="systemd" path="/run/systemd/inaccessible/blk" dev="tmpfs" ino=9065 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:tmpfs_t:s0 tclass=blk_file permissive=0
Sep 09 14:03:17 localhost.localdomain audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=blk-availability comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Sep 09 14:03:17 localhost.localdomain audit[1]: AVC avc:  denied  { getattr } for  pid=1 comm="systemd" path="/run/systemd/inaccessible/blk" dev="tmpfs" ino=9065 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:tmpfs_t:s0 tclass=blk_file permissive=0
Sep 09 14:03:17 localhost.localdomain systemd[1]: Couldn't stat device /run/systemd/inaccessible/blk

Version-Release number of selected component (if applicable):

systemd-231-4.fc25.x86_64
selinux-policy-3.13.1-211.fc25.noarch

How reproducible:

This happens during the Cockpit integration tests, for most test runs on Fedora 25. Just booting the system is usually enough to make it happen.

Example: https://stefw.fedorapeople.org/logs/pull-ba275a3a-verify-fedora-25/TestSession-testBasic-10.111.113.252-FAIL.log

Comment 1 Chris Murphy 2016-09-10 00:42:56 UTC
Also happens with Fedora 25 Workstation, 20160909.n.0 nightly build.

SELinux is preventing systemd from getattr access on the blk_file /run/systemd/inaccessible/blk.

*****  Plugin restorecon (99.5 confidence) suggests   ************************

If you want to fix the label. 
/run/systemd/inaccessible/blk default label should be init_var_run_t.
Then you can run restorecon.
Do
# /sbin/restorecon -v /run/systemd/inaccessible/blk

*****  Plugin catchall (1.49 confidence) suggests   **************************

If you believe that systemd should be allowed getattr access on the blk blk_file by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# ausearch -c 'systemd' --raw | audit2allow -M my-systemd
# semodule -X 300 -i my-systemd.pp

Additional Information:
Source Context                system_u:system_r:init_t:s0
Target Context                system_u:object_r:tmpfs_t:s0
Target Objects                /run/systemd/inaccessible/blk [ blk_file ]
Source                        systemd
Source Path                   systemd
Port                          <Unknown>
Host                          localhost
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.13.1-208.fc25.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     localhost.localdomain
Platform                      Linux localhost.localdomain
                              4.8.0-0.rc4.git0.1.fc25.x86_64 #1 SMP Mon Aug 29
                              19:28:01 UTC 2016 x86_64 x86_64
Alert Count                   1
First Seen                    2016-09-10 00:30:29 EDT
Last Seen                     2016-09-10 00:30:29 EDT
Local ID                      6d22634d-71e9-4374-b03a-59ae36a51c49

Raw Audit Messages
type=AVC msg=audit(1473481829.783:107): avc:  denied  { getattr } for  pid=1 comm="systemd" path="/run/systemd/inaccessible/blk" dev="tmpfs" ino=1191 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:tmpfs_t:s0 tclass=blk_file permissive=0


Hash: systemd,init_t,tmpfs_t,blk_file,getattr

Comment 2 Dagan McGregor 2016-09-10 06:36:05 UTC
Is this a duplicate of 1367280?

Comment 3 Chris Murphy 2016-09-10 17:43:45 UTC

*** This bug has been marked as a duplicate of bug 1367280 ***


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