3.5 - RHSA-2015:0323

Problem Description:

Updated libvirt packages that fix two security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Low security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64 Red Hat Enterprise Linux Server (v. 7) - ppc64, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

The libvirt library is a C API for managing and interacting with the virtualization capabilities of Linux and other operating systems.

It was found that QEMU's qemuDomainMigratePerform() and qemuDomainMigrateFinish2() functions did not correctly perform a domain unlock on a failed ACL check. A remote attacker able to establish a connection to libvirtd could use this flaw to lock a domain of a more privileged user, causing a denial of service. (CVE-2014-8136)

It was discovered that the virDomainSnapshotGetXMLDesc() and virDomainSaveImageGetXMLDesc() functions did not sufficiently limit the usage of the VIR_DOMAIN_XML_SECURE flag when fine-grained ACLs were enabled. A remote attacker able to establish a connection to libvirtd could use this flaw to obtain certain sensitive information from the domain XML file. (CVE-2015-0236)

The CVE-2015-0236 issue was found by Luyao Huang of Red Hat.

Bug fixes:

* The libvirtd daemon previously attempted to search for SELinux contexts even when SELinux was disabled on the host. Consequently, libvirtd logged "Unable to lookup SELinux process context" error messages every time a client connected to libvirtd and SELinux was disabled. libvirtd now verifies whether SELinux is enabled before searching for SELinux contexts, and no longer logs the error messages on a host with SELinux disabled. (BZ#1135155)

* The libvirt utility passed incomplete PCI addresses to QEMU. Consequently, assigning a PCI device that had a PCI address with a non-zero domain to a guest failed. Now, libvirt properly passes PCI domain to QEMU when assigning PCI devices, which prevents the described problem. (BZ#1127080)

* Because the virDomainSetMaxMemory API did not allow changing the current memory in the LXC driver, the "virsh setmaxmem" command failed when attempting to set the maximum memory to be lower than the current memory. Now, "virsh setmaxmem" sets the current memory to the intended value of the maximum memory, which avoids the mentioned problem. (BZ#1091132)

* Attempting to start a non-existent domain caused network filters to stay locked for read-only access. Because of this, subsequent attempts to gain read-write access to network filters triggered a deadlock. Network filters are now properly unlocked in the described scenario, and the deadlock no longer occurs. (BZ#1088864)

* If a guest configuration had an active nwfilter using the DHCP snooping feature and an attempt was made to terminate libvirtd before the associated nwfilter rule snooped the guest IP address from DHCP packets, libvirtd became unresponsive. This problem has been fixed by setting a longer wait time for snooping the guest IP address. (BZ#1075543)

Enhancements:

* A new "migrate_host" option is now available in /etc/libvirt/qemu.conf, which allows users to set a custom IP address to be used for incoming migrations. (BZ#1087671)

* With this update, libvirt is able to create a compressed memory-only crash dump of a QEMU domain. This type of crash dump is directly readable by the GNU Debugger and requires significantly less hard disk space than the standard crash dump. (BZ#1035158)

* Support for reporting the NUMA node distance of the host has been added to libvirt. This enhances the current libvirt capabilities for reporting NUMA topology of the host, and allows for easier optimization of new domains. (BZ#1086331)

* The XML file of guest and host capabilities generated by the "virsh capabilities" command has been enhanced to list the following information, where relevant: the interface speed and link status of the host, the PCI Express (PCIe) details, the host's hardware support for I/O virtualization, and a report on the huge memory pages. (BZ#1076960, BZ#1076957, BZ#1076959, BZ#1076962)

These packages also include a number of other bug fixes and enhancements. For additional details, see the "Bugs Fixed" section below.

4. Solution:

All libvirt users are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add these enhancements. After installing the updated packages, libvirtd will be restarted automatically.

Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

706887 - [TestOnly] qemu truncates JSON numbers >= 0x8000_0000_0000_0000 765733 - Error reporting when qemu terminates unexpectedly is inconsistent and sometimes unhelpful 823535 - Libvirt is sensitive to the order in which the video devices are passed 872628 - List available LXC consoles using container_ttys env variable 874418 - clear the error message when dump a guest with pass-through device 876829 - create external checkpoint snapshot will change the guest pmsuspended state and guest hang forever 877244 - Virsh command will delay a long time if restart libvirtd with many virtual networks running 878394 - virsh iface-dumpxml or virt-manager reports "bond interface misses the bond element" for inactive bond interfaces 880483 - Guest can use inactive macvtap-passthrough network 921094 - Missing auditing for serial, parallel, channel, console and smartcard devices 924853 - blockcopy to cifs fails 956506 - virsh snapshot-delete --children-only bypasses safety check for deleting disk-only children 957293 - support libiscsi for SCSI passthrough devices 963817 - Stable SCSI host addressing 964177 - virConnectDomainEventRTCChangeCallback returns wrong offset 967493 - Lockfailure action Ignore will lead to sanlock rem_lockspace stuck 967494 - Lockfailure action Restart can shutdown the guest but fail to start it 972964 - WWN option for Hot Attaching SCSI Disks 983350 - The running Guest was paused while cancel the migration on the third machine 985782 - Some flag values of method are missing in libvirt-python bindings 985980 - virsh vcpuinfo output is difficult to read with large cpu counts 990418 - Provide option to enable/disable 64-bit PCI hole 991290 - Fail to modify the name attribute of ipv6 dhcp host via virsh net-update 992980 - Separate limits for anonymous and authenticated users 994731 - Documentation for virDomainLookupBy* should mention caller's responsibility to free virDomainPtr 995377 - Domain without autostart can't be resumed by the libvirt-guests script after rebooting the host 997802 - domdisplay should show all URI if config both vnc and spice in guest 999926 - Policy denies libvirtd the permission to relabel unix domain sockets 1006700 - need add "interface" to virt-xml-validate manual page 1007698 - The cpu_shares value of domain xml should be consistent with return value of schedinfo. 1007759 - libvirt should forbid to attach a device with boot order for the first time if the os/boot element exists 1021703 - [RFE] Support for qemu-kvm's "-boot splash_time" parameter 1022874 - In man page of virsh, a typo 'COMMMANDS' displays three times 1023366 - [virsh cmd] Error message is not clear for commands blkiotune and schedinfo 1025407 - autoport='yes' doesn't skip over ports in use with IPv6 1027076 - Fail to start lxc with disabled selinux due to the existed empty /selinux 1029266 - Error message is not clear for command nwfilter-define under non-root user. 1029732 - Libvirt can not update/modify queues value of interface element using update-device command 1032363 - document need to pass image name for block backed disks with --disk-only 1033398 - Nodedev-destroy commands both doc and error message when destroy HBA are not clear 1033704 - domain xml: libvirt should take defaultMode value into account when discarding entries 1035128 - Stable guest ABI doesn't check redirected usb device 1035966 - Start autostarted virtual networks in background 1041569 - [NFR] libvirt: Returning the allocation watermark for all the images opened for writing during block-commit 1043735 - virsh command domiftune bound parameter checking error 1046192 - Can't set the timer base as localtime once localtime is used in the variable attribute. 1047818 - VFs can not be listed by net-dumpxml directly after starting the hostdev network 1052114 - guest fail to start with permission denied error when with gluster volume 1056902 - virsh attach-interface/detach-interface mishandles inactive configuration on device hot(un)plug commands 1062142 - live snapshot merge (commit) of the active layer 1064770 - Fail to update floor attribute of QoS using updateDeviceFlags 1066280 - Fail to restore guest from the save file while set the static selinux lable for the guest and set the relabel='no' in the guest's xml 1066894 - Implement for libvirt guest's xml for security label 1067338 - Mem leak while start a guest with a character followed 1069784 - block commit/pull support for disks using libgfapi volumes 1070680 - cpu-stats boundary value problem 1071095 - Libvirt report incorrect error message when parsing invalid value of CTRL_IP_LEARNING in nwfilter 1072141 - "pool-list --type gluster" list other types pool 1072292 - Libvirt report incorrect message when starting domain with nwfilter whose chain priority is greater than its filter rule priority 1072653 - vol-upload should change the volume target format type after uploading a different format file to it 1072677 - Incorrect error message when hot-plugging interface with an inexistence nwfilter 1073368 - [libvirt] can create live snapshot of passthrough device (iSCSI LUN or block device) 1075290 - gluster option is not showed in virsh --version=long 1075299 - Failed to get the vol-name by giving volume path in gluster pool. 1075543 - Libvirt does not terminate when DHCP snooping is being used 1076098 - [RFE] allow setting video ram size (vgamem_mb) for qemu vga cards. 1076725 - libvirt: Multi-node NUMA policy assignment 1076957 - Expose huge pages information through libvirt API 1076959 - Expose host hardware support for I/O virtualization via libvirt API 1076960 - Expose interface speed and link information via API 1076962 - Expose PCIe BW and lane information through API 1076989 - Enable complex memory requirements for virtual machines 1077009 - It shouldn't be permitted to change the uuid of a nwfilter 1077572 - Python setInterfaceParameters function is broken 1078590 - use of tls with libvirt.so can leave zombie processes 1079162 - The guest will be destroyed abnormally while revert the guest's snapshot which took in "pmsuspended" status 1079173 - libvirt can not do vol-download for gluster pool volume 1080859 - [Snapshot Doc] In snapshot-create-as manual page, supported snapshot type should be no, internal and external 1081461 - Dropped guest network connection during migration (before it finished) 1081881 - Fail to start guest with 2 displays mixed with port allocated automatically and fixed port. 1081932 - the return value of API virNodeDevice.listCaps() is not correct 1082124 - RHEL7 libvirt vs older qemu: unable to execute QEMU command 'qom-get': The command qom-get has not been found 1082521 - The sg disk is not really shared within 2 guests 1083345 - The --memspec parameters "snapshot=no" doesn't work when creating internal disk snapshot 1084360 - [doc] Document behavior of --reuse-external (VIR_DOMAIN_SNAPSHOT_CREATE_REUSE_EXT) 1085706 - virsh numatune should forbid to accept int as parameter values 1085769 - [Stroage][vol-clone] Volume was cloned successfully when passing an non-existing pool 1086121 - Improve the error message when failed to restore a guest with a not availabe disk with startupPolicy='optional' 1086704 - Don't allow aio=native without cache=none 1087104 - [Storage][vol-download] virsh cmd vol-download works with option offset and length by passing a negative integer 1088667 - [storage] some volume related virsh commands work when the passed volume is not one volume of the passed pool 1088787 - Libvirt should clean up socket file on destroyed domain with UNIX character device 1088864 - nwfilter deadlock 1088901 - Fail to do external disk-only snapshot when guest use FC storage 1089179 - The error is inaccurate when create snapshot with memspec snapshot=external and diskspec snapshot=no 1091866 - volume is disappered after vol-wipe with logical type pool 1092253 - Improve the error message when blockpull with a wrong base path 1092363 - [RHEL7] Virsh cmd maxvcpus returns 255 for kvm type, but the maximum number of vcpus supported by kvm is 160. 1093127 - RFE: report NUMA node locality for PCI devices 1095035 - [RHEL7][Storage]The "lazy_refcounts" feature was missing in the xml printed by vol-dumpxml for a qcow3 disk in a native gluster pool 1095636 - SELinux prevent qemu from attaching tuntap queues 1097028 - Don't fail starting domain without cpu, cpuset and cpuacct cgroups controllers 1097503 - guest will be paused and can't resume when do external system checkpoint snapshot with wrong compression format 1097677 - libvirt loses track of hotplugged vcpus after daemon restart 1097968 - libvirt-python API baselineCPU doesn't generate exception 1098659 - libvirt binds only to ipv6 1099978 - Maintain relative path to backing file image during live merge (block-commit) 1100769 - blkiotune weight range should be (10, 1000) 1101059 - virsh vcpupin need accurate error message when --vcpu argument is negative 1101510 - no need to require iptables-ipv6 1101731 - Rebase libvirt to current upstream release 1101987 - Libvirt should report error when try to revert guest to external system checkpoint snapshot 1101999 - virt-xml-validate should pass when netfs pool xml with glusterfs backend 1102611 - The running guest will disappear while change the security_driver from "none" to "selinux" 1103245 - libvirt reset rtc interrupt backlog after guest-set-time 1104992 - Guest fail to start while disks use same no-exist source file even though with startupPolicy='optional' 1104993 - Garbage characters show in the output of pool-name with no-exist pool UUID 1105939 - Fail to start guest while disable the default security labeling 1108593 - Libvirtd will crash while start a guest which DAC's seclabel type='none' in guest's xml 1110198 - domblkinfo doesn't work when guest use glusterfs as source 1110212 - The error info is not correct when do blockcommit with --base and --top point to same source 1110673 - typo errors in man page VIRSH(1) 1111044 - capabilities mode hostdev shouldn't be added in KVM 1112939 - libvirt should prompt more readable error message while ide/sata bus disk do not support readonly 1113116 - [RFE] add API to query the stats of multiple VMs at once 1113332 - python bindings for graphics event have wrong value for address type 1113668 - libvirt failed to start a domain with unix+guestfwd channel 1113861 - The guest will disappear after restart the libvirtd service while set seclabel type='static' model='none' relabel='yes'/> in guest's xml. 1113868 - domxml-to-native fails for spice graphics with autoport='yes' when spice_tls is disabled 1115898 - [RFE] Add events for cputune and iotune change 1118710 - The error info is not accurate when do vol-wipe with volume based on gluster pool 1119206 - RFE: Multiple virtio-rng devices support 1119215 - Generate the redundant record in guest's xml while configure the same listen address in guest's xm 1119387 - The default behavor of abort block job with pivot flag isn't sync 1119592 - libvirt will report error after use pool-build in Non-root mode(qemu:///session) 1119784 - QMP: extend block events with error information 1121837 - numatune can use nodeset 0,^0 but can't edit xml like this 1121955 - virsh command takes long time to finish after set "log_level = 1" only 1122255 - 'virsh desc $dom blah' doesn't survive libvirtd restart 1122455 - libvirt should refuse to start domain with unsupported/useless min-guarantee element in qemu driver 1122973 - missing pci address for vga devices 1126329 - Libvirt should forbid using relative path to the new overaly snapshot image for external snapshots 1126721 - [Doc] Attribute name vlan-id should be vlanid in nwfilter xml docs 1126909 - Wrong block job type reported for active layer commit 1126991 - [libvirt] expose ivshmem 1128097 - Can't use domiftune --inbound 0 or --outbound 0 to clear inbound or outbound settings for a shut off guest 1128751 - isn't always formated as it should be 1129207 - libvirtd will crash after do managedsave the same guest in the same time 1129372 - Failed to start domain with specified cputune after decreasing vcpu number 1129998 - numatune --mode can't work well 1130089 - Possible deadlock when the domain is destroyed on destination during migration 1130379 - [Doc]no manual about metadata command in virsh manual 1131306 - number range should be checked for the 4 new options of blkiotune 1131445 - Could not show process info for migration at once. 1131788 - blkdeviotune should can be used in session mode 1131811 - The iotune element will disappear from the guest's xml while set an invalid value 1131819 - Libvirtd crash while set blkdeviotune with the hotplug disk and specify the --config option 1131876 - The range for blkdeviotune was different in guest's xml and virsh command line 1131897 - virDomainSetMemoryFlags doesn't process flag VIR_DOMAIN_MEM_MAXIMUM for LXC 1132301 - Error msg is not right for option -k and -K against virsh command 1132305 - option -k and -K should point out range of reasonable values against virsh command 1132347 - Libvirt crash after defining/editing macvtap network pool with