RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1592688 - SELinux is preventing /usr/libexec/qemu-kvm from map access
Summary: SELinux is preventing /usr/libexec/qemu-kvm from map access
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.6
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Lukas Vrabec
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks: 1553085
TreeView+ depends on / blocked
 
Reported: 2018-06-19 07:04 UTC by Junxiang Li
Modified: 2018-10-30 10:06 UTC (History)
11 users (show)

Fixed In Version: selinux-policy-3.13.1-205.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2018-10-30 10:05:46 UTC
Target Upstream Version:
Embargoed:
yafu: needinfo-

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 1514538 0 unspecified CLOSED libvirt + qemu + hugepages won't start with SElinux enabled 2021-02-22 00:41:40 UTC
Red Hat Product Errata RHBA-2018:3111 0 None None None 2018-10-30 10:06:45 UTC

Internal Links: 1514538

Description Junxiang Li 2018-06-19 07:04:22 UTC 
Description of problem:
SELinux is preventing /usr/libexec/qemu-kvm from map access


Additional Information:
Source Context                system_u:system_r:svirt_t:s0:c296,c387 
Target Context                system_u:object_r:svirt_image_t:s0
Target Objects                Please check message
Source                        qemu-kvm
Source Path                   /usr/libexec/qemu-kvm
Port                          <Unknown>
Host                          host.example.com
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.13.1-204.el7.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     host.example.com
Platform                      Linux host.example.com
                              kernel-3.10.0-897.el7.x86_64
Alert Count                   1
First Seen                    <Unknown>
Last Seen                     2018-06-19 03:00:00 EDT
Local ID                      <Unknown>

Raw Audit Messages
type=AVC msg=audit(1529373654.545:13947): avc:  denied  { map } for  pid=20718 comm="qemu-kvm" path=2F6465762F687567657061676573324D2F6C6962766972742F71656D752F312D61766F6361646F2D76742D766D312F71656D755F6261636B5F6D656D2E5F6F626A656374735F72616D2D6E6F6465302E34315147524F202864656C6574656429 dev="hugetlbfs" ino=452846 scontext=system_u:system_r:svirt_t:s0:c296,c387 tcontext=system_u:object_r:svirt_image_t:s0 tclass=file permissive=0

Hash: qemu-kvm,svirt_t,svirt_image_t,file,map
Comment 2 Milos Malik 2018-06-20 08:58:05 UTC 
Here is the same SELinux denial interpreted by ausearch -i:
----
type=AVC msg=audit(06/19/2018 04:00:54.545:13947) : avc:  denied  { map } for  pid=20718 comm=qemu-kvm path=/dev/hugepages2M/libvirt/qemu/1-avocado-vt-vm1/qemu_back_mem._objects_ram-node0.41QGRO (deleted) dev="hugetlbfs" ino=452846 scontext=system_u:system_r:svirt_t:s0:c296,c387 tcontext=system_u:object_r:svirt_image_t:s0 tclass=file permissive=0 
----
Comment 3 Milos Malik 2018-06-20 09:15:20 UTC 
I wonder why is the deleted file labeled svirt_image_t. Is it really a virtual machine image?

 * https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html-single/virtualization_security_guide/#sect-Virtualization_Security_Guide-sVirt-Labels
Comment 4 Milos Malik 2018-06-20 09:16:55 UTC 
Sorry, I meant to write "Virtual Machine Shared Read/Write Content" instead of "Virtual Machine Image".
Comment 5 Junxiang Li 2018-06-20 09:44:01 UTC 
(In reply to Milos Malik from comment #3)
> I wonder why is the deleted file labeled svirt_image_t. Is it really a
> virtual machine image?
> 
>  *
> https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/
> html-single/virtualization_security_guide/#sect-
> Virtualization_Security_Guide-sVirt-Labels

Sorry, I'm not sure.

Hi yafu,
Could you help answer this question?
Comment 6 Luyao Huang 2018-06-21 02:17:26 UTC 
This file is created by qemu-kvm (qemu will create a tmp file then mmap memory and then delete this file in this case) and the directory /dev/hugepages2M/libvirt/qemu/1-avocado-vt-vm1/ is created by libvirt and libvirt change this dir context to system_u:object_r:svirt_image_t:s0:cxxx,cxxx , that is why this file labeled svirt_image_t.

I checked this issue have already been fixed in Fedora (see bug 1514538) and here is the result of sesearch in F28:

# sesearch -A -s svirt_t -t svirt_image_t
allow svirt_t svirt_image_t:file map;
...
Comment 7 Yanqiu Zhang 2018-06-22 06:32:28 UTC 
Add keyword "TestBlocker", it blocks several libvirt "Guest NUMA memory binding" function tests. Please resolve ASAP.
Comment 12 errata-xmlrpc 2018-10-30 10:05:46 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-2018:3111
Note You need to log in before you can comment on or make changes to this bug.