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Bug 1822518

Summary:	RDMA migration succeeds but there is audit error "AVC denied qemu-kvm create netlink_rdma_socket"
Product:	Red Hat Enterprise Linux 9	Reporter:	Fangge Jin <fjin>
Component:	libvirt	Assignee:	Virtualization Maintenance <virt-maint>
Status:	CLOSED WONTFIX	QA Contact:	Fangge Jin <fjin>
Severity:	medium	Docs Contact:
Priority:	low
Version:	unspecified	CC:	chhu, dgilbert, jsuchane, lmen, mprivozn, virt-maint, xuzhang, yafu
Target Milestone:	rc	Keywords:	Triaged
Target Release:	---	Flags:	pm-rhel: mirror+
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-09 07:27:08 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1897025

Description Fangge Jin 2020-04-09 09:04:16 UTC

Description of problem:
Do RDMA migration, migration succeeds, but there is audit error on target host.

Version-Release number of selected component:
qemu-kvm-4.2.0-17.module+el8.2.0+6141+0f540f16.x86_64
selinux-policy-3.14.3-41.el8.noarch
libvirt-6.0.0-17.module+el8.2.0+6257+0d066c28.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Setup rdma migration env

2. Start a vm, and do migration:
# virsh migrate rhev qemu+ssh://*****/system  --live --verbose --p2p --listen-address 0.0.0.0 --migrateuri rdma://192.168.100.8
[100%]

3. After migration completes, check audit message on target host:
# ausearch -c qemu-kvm -m avc
----
time->Thu Apr  9 04:55:29 2020
type=AVC msg=audit(1586422529.809:350): avc:  denied  { read write } for  pid=3449 comm="qemu-kvm" path="/dev/mapper/control" dev="devtmpfs" ino=25607 scontext=system_u:system_r:svirt_t:s0:c116,c867 tcontext=system_u:object_r:lvm_control_t:s0 tclass=chr_file permissive=0
----
time->Thu Apr  9 04:55:30 2020
type=AVC msg=audit(1586422530.256:351): avc:  denied  { create } for  pid=3449 comm="qemu-kvm" scontext=system_u:system_r:svirt_t:s0:c116,c867 tcontext=system_u:system_r:svirt_t:s0:c116,c867 tclass=netlink_rdma_socket permissive=0
----
time->Thu Apr  9 04:55:30 2020
type=AVC msg=audit(1586422530.256:352): avc:  denied  { create } for  pid=3449 comm="qemu-kvm" scontext=system_u:system_r:svirt_t:s0:c116,c867 tcontext=system_u:system_r:svirt_t:s0:c116,c867 tclass=netlink_rdma_socket permissive=0
----
time->Thu Apr  9 04:55:30 2020
type=AVC msg=audit(1586422530.279:362): avc:  denied  { create } for  pid=3449 comm="qemu-kvm" scontext=system_u:system_r:svirt_t:s0:c116,c867 tcontext=system_u:system_r:svirt_t:s0:c116,c867 tclass=netlink_rdma_socket permissive=0


Actual results:
As above

Expected results:
No error in audit log

Additional info:

Comment 2 Dr. David Alan Gilbert 2020-05-07 14:31:45 UTC

Hi,
  Can you check your /etc/libvirt/qemu.conf,  you may need to add /dev/infiniband stuff to cgroup_device_acl, in my config I have:

cgroup_device_acl = [
    "/dev/null", "/dev/full", "/dev/zero",
    "/dev/random", "/dev/urandom",
    "/dev/ptmx", "/dev/kvm",
    "/dev/rtc","/dev/hpet",
   "/dev/infiniband/rdma_cm",
   "/dev/infiniband/issm0",
   "/dev/infiniband/issm1",
   "/dev/infiniband/umad0",
   "/dev/infiniband/umad1",
   "/dev/infiniband/uverbs0"
]


(the /dev/mapper/control is weirder though)

Comment 3 Michal Privoznik 2020-05-07 14:36:23 UTC

(In reply to Dr. David Alan Gilbert from comment #2)

> 
> (the /dev/mapper/control is weirder though)

This is tracked in bug 1822522. Nevertheless, it's still weird.

Comment 4 Dr. David Alan Gilbert 2020-05-07 14:39:39 UTC

Also, which RDMA card is this? I see https://bugzilla.redhat.com/show_bug.cgi?id=1786670 but that seems to only by Intel Omni path

Comment 5 Fangge Jin 2020-05-08 02:31:57 UTC

1) I have cgroup_device_acl configured correctly, or migration will fail.

2) The RDMA card I used is:
3b:00.0 Ethernet controller: Mellanox Technologies MT27700 Family [ConnectX-4]

Comment 8 John Ferlan 2021-09-09 18:23:25 UTC

Bulk update: Move RHEL-AV bugs to RHEL9. If necessary to resolve in RHEL8, then clone to the current RHEL8 release.

Comment 9 RHEL Program Management 2021-10-09 07:27:08 UTC

After evaluating this issue, there are no plans to address it further or fix it in an upcoming release.  Therefore, it is being closed.  If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.