Skip to content

L
libvirt

openeuler / libvirt

通知 3
Star 0
Fork 0
L
libvirt
切换分支/标签
  1. 29 8月, 2015 1 次提交
  3. 17 6月, 2015 1 次提交
  5. 22 5月, 2015 1 次提交
    • T
      conf: fix issue on virCPUDefCopy · f0be92b4
      由 Thibaut Collet 提交于 
      The cpu xml copy is incorrect: the memAccess field is not copied.
The lack of copy of this memAccess field can cause unexpected behaviour for live
migration when vhost user is used.

For example if guest has the following configuration:
....
<cpu>
<model>Westmere</model>
<topology sockets="1" cores="4" threads="1"/>
<numa>
<cell id='0' cpus='0-3' memory='2097152' memAccess='shared'/>
</numa>
</cpu>
....

The used configuration on the remote host in case of live migration is:
....
  <cpu mode='custom' match='exact'>
    <model fallback='allow'>Westmere</model>
    <topology sockets='1' cores='4' threads='1'/>
    <numa>
      <cell id='0' cpus='0-3' memory='2097152' unit='KiB'/>
    </numa>
  </cpu>
....

On the remote host the lack of memAccess info can cause unexpected error on the
qemu backend vhost user driver.

Fixes: def6b359 ("docs, conf, schema: add support for shared memory mapping")

This issue is present only for libvirt1.2.9 to libvirt1.2.12
With patch 181742d4 ("conf: Move all NUMA configuration to virDomainNuma")
present since libvirt1.2.13 the problem does not exist anymore as NUMA
information are no more in the CPU configuration.
Signed-off-by: NThibaut Collet <thibaut.collet@6wind.com>
      f0be92b4
  7. 17 3月, 2015 1 次提交
    • E
      daemon: avoid memleak when ListAll returns nothing · b175298b
      由 Eric Blake 提交于 
      Commit 4f25146b (v1.2.8) managed to silence Coverity, but at the
cost of a memory leak detected by valgrind:
==24129== 40 bytes in 5 blocks are definitely lost in loss record 355 of 637
==24129==    at 0x4A08B1C: realloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==24129==    by 0x5084B8E: virReallocN (viralloc.c:245)
==24129==    by 0x514D5AA: virDomainObjListExport (domain_conf.c:22200)
==24129==    by 0x201227DB: qemuConnectListAllDomains (qemu_driver.c:18042)
==24129==    by 0x51CC1B6: virConnectListAllDomains (libvirt-domain.c:6797)
==24129==    by 0x14173D: remoteDispatchConnectListAllDomains (remote.c:1580)
==24129==    by 0x121BE1: remoteDispatchConnectListAllDomainsHelper (remote_dispatch.h:1072)

In short, every time a client calls a ListAll variant and asks
for the resulting list, but there are 0 elements to return, we
end up leaking the 1-entry array that holds the NULL terminator.

What's worse, a read-only client can access these functions in a
tight loop to cause libvirtd to eventually run out of memory; and
this can be considered a denial of service attack against more
privileged clients.  Thankfully, the leak is so small (8 bytes per
call) that you would already have some other denial of service with
any guest calling the API that frequently, so an out-of-memory
crash is unlikely enough that this did not warrant a CVE.

* daemon/remote.c (remoteDispatchConnectListAllDomains)
(remoteDispatchDomainListAllSnapshots)
(remoteDispatchDomainSnapshotListAllChildren)
(remoteDispatchConnectListAllStoragePools)
(remoteDispatchStoragePoolListAllVolumes)
(remoteDispatchConnectListAllNetworks)
(remoteDispatchConnectListAllInterfaces)
(remoteDispatchConnectListAllNodeDevices)
(remoteDispatchConnectListAllNWFilters)
(remoteDispatchConnectListAllSecrets)
(remoteDispatchNetworkGetDHCPLeases): Plug leak.
Signed-off-by: NEric Blake <eblake@redhat.com>
(cherry picked from commit 3c2ff502)
      b175298b
  9. 23 1月, 2015 2 次提交
  11. 13 12月, 2014 2 次提交
  13. 12 12月, 2014 1 次提交
  15. 11 12月, 2014 6 次提交
  17. 10 12月, 2014 25 次提交