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Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.

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Daniel P. Berrangé c2dc6698c8 log: fix deadlock obtaining hostname (related CVE-2018-6764) The fix for CVE-2018-6764 introduced a potential deadlock scenario that gets triggered by the NSS module when virGetHostname() calls getaddrinfo to resolve the hostname: #0 0x00007f6e714b57e7 in futex_wait #1 futex_wait_simple #2 __pthread_once_slow #3 0x00007f6e71d16e7d in virOnce #4 0x00007f6e71d0997c in virLogInitialize #5 0x00007f6e71d0a09a in virLogVMessage #6 0x00007f6e71d09ffd in virLogMessage #7 0x00007f6e71d0db22 in virObjectNew #8 0x00007f6e71d0dbf1 in virObjectLockableNew #9 0x00007f6e71d0d3e5 in virMacMapNew #10 0x00007f6e71cdc50a in findLease #11 0x00007f6e71cdcc56 in _nss_libvirt_gethostbyname4_r #12 0x00007f6e724631fc in gaih_inet #13 0x00007f6e72464697 in __GI_getaddrinfo #14 0x00007f6e71d19e81 in virGetHostnameImpl #15 0x00007f6e71d1a057 in virGetHostnameQuiet #16 0x00007f6e71d09936 in virLogOnceInit #17 0x00007f6e71d09952 in virLogOnce #18 0x00007f6e714b5829 in __pthread_once_slow #19 0x00007f6e71d16e7d in virOnce #20 0x00007f6e71d0997c in virLogInitialize #21 0x00007f6e71d0a09a in virLogVMessage #22 0x00007f6e71d09ffd in virLogMessage #23 0x00007f6e71d0db22 in virObjectNew #24 0x00007f6e71d0dbf1 in virObjectLockableNew #25 0x00007f6e71d0d3e5 in virMacMapNew #26 0x00007f6e71cdc50a in findLease #27 0x00007f6e71cdc839 in _nss_libvirt_gethostbyname3_r #28 0x00007f6e71cdc724 in _nss_libvirt_gethostbyname2_r #29 0x00007f6e7248f72f in __gethostbyname2_r #30 0x00007f6e7248f494 in gethostbyname2 #31 0x000056348c30c36d in hosts_keys #32 0x000056348c30b7d2 in main Fortunately the extra stuff virGetHostname does is totally irrelevant to the needs of the logging code, so we can just inline a call to the native hostname() syscall directly. Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>		2018-02-12 12:29:13 +00:00
.gnulib@7e7c5c7952	maint: update to latest gnulib	2018-01-03 15:48:14 -06:00
build-aux	perl: Don't hardcode interpreter path	2017-09-19 16:04:53 +02:00
daemon	build: passing the "-z defs" linker flag to prevent undefined symbols	2018-02-09 11:05:10 +00:00
docs	docs: document requirement to provide Signed-off-by lines for DCO	2018-02-09 11:13:17 +00:00
examples	apparmor: allow libvirt to send term signal to unconfined	2018-02-06 17:26:29 +01:00
gnulib	build: drop hack for old mingw ssize_t	2016-07-12 08:57:13 -06:00
include/libvirt	storage: export virStoragePoolLookupByTargetPath as a public API	2018-02-09 11:05:10 +00:00
m4	build: passing the "-z defs" linker flag to prevent undefined symbols	2018-02-09 11:05:10 +00:00
po	storage: move storage file backend framework into util directory	2018-02-09 11:05:10 +00:00
src	log: fix deadlock obtaining hostname (related CVE-2018-6764)	2018-02-12 12:29:13 +00:00
tests	conf: expand network device callbacks to cover resolving NIC type	2018-02-09 11:05:10 +00:00
tools	build: passing the "-z defs" linker flag to prevent undefined symbols	2018-02-09 11:05:10 +00:00
.color_coded.in	Add color_coded support	2017-05-09 09:51:11 +02:00
.ctags	maint: Make ctags work out of the box	2013-07-18 08:47:21 +02:00
.dir-locals.el	build: avoid tabs that failed syntax-check	2012-09-06 09:43:46 -06:00
.gitignore	admin: move admins server impl/dispatch into src/admin directory	2018-01-31 15:12:30 +00:00
.gitmodules	util: switch over to use keycodemapdb GIT submodule	2017-04-25 21:14:18 +01:00
.mailmap	mailmap: set preferred spelling for my name	2018-01-25 09:42:27 +00:00
.travis.yml	travis: Skip nfs-common installation	2018-01-12 14:40:58 +01:00
.ycm_extra_conf.py.in	Add YouCompleteMe support	2017-05-09 09:51:11 +02:00
AUTHORS.in	AUTHORS: Add myself to the list of committers	2018-02-08 12:49:11 +01:00
autogen.sh	autogen.sh: tell user the correct make command	2017-12-18 17:03:51 +00:00
bootstrap	maint: update to latest gnulib	2018-01-03 15:48:14 -06:00
bootstrap.conf	hvsupport: use a regex instead of XML::XPath	2016-07-19 18:42:44 +02:00
cfg.mk	log: fix deadlock obtaining hostname (related CVE-2018-6764)	2018-02-12 12:29:13 +00:00
ChangeLog-old	Fix typos in src/*	2014-04-21 16:49:08 -06:00
config-post.h	Remove backslash alignment attempts	2017-11-03 13:24:12 +01:00
configure.ac	build: passing the "-z defs" linker flag to prevent undefined symbols	2018-02-09 11:05:10 +00:00
COPYING	maint: follow recommended practice for using LGPL	2013-05-20 14:15:21 -06:00
COPYING.LESSER	maint: Remove control characters from LGPL license file	2015-09-25 09:16:24 +02:00
libvirt-admin.pc.in	Add libvirt-admin library	2015-06-16 13:46:20 +02:00
libvirt-lxc.pc.in	Add pkg-config files for libvirt-qemu & libvirt-lxc	2014-06-23 16:17:27 +01:00
libvirt-qemu.pc.in	Add pkg-config files for libvirt-qemu & libvirt-lxc	2014-06-23 16:17:27 +01:00
libvirt.pc.in	Add pkg-config files for libvirt-qemu & libvirt-lxc	2014-06-23 16:17:27 +01:00
libvirt.spec.in	lockd: Install the admin sockets	2018-02-09 06:34:20 -05:00
Makefile.am	Remove backslash alignment attempts	2017-11-03 13:24:12 +01:00
Makefile.nonreentrant	Remove backslash alignment attempts	2017-11-03 13:24:12 +01:00
mingw-libvirt.spec.in	Add libxslt as build requires for mingw RPMs	2017-09-04 13:05:24 +01:00
README	Provide a useful README file	2017-05-22 17:01:37 +01:00
README-hacking	HACKING: Drop from the git repository	2017-06-26 14:25:54 +02:00
README.md	Add CII best practices badge	2017-10-13 16:08:01 +01:00
run.in	Add PKG_CONFIG_PATH to run.in script.	2014-06-26 14:32:35 +01:00

README.md

Libvirt API for virtualization

For some of these hypervisors, it provides a stateful management daemon which runs on the virtualization host allowing access to the API both by non-privileged local users and remote users.

Layered packages provide bindings of the libvirt C API into other languages including Python, Perl, PHP, Go, Java, OCaml, as well as mappings into object systems such as GObject, CIM and SNMP.

Further information about the libvirt project can be found on the website:

https://libvirt.org

License

The libvirt C API is distributed under the terms of GNU Lesser General Public License, version 2.1 (or later). Some parts of the code that are not part of the C library may have the more restrictive GNU General Public License, version 2.1 (or later). See the files COPYING.LESSER and COPYING for full license terms & conditions.

Installation

Libvirt uses the GNU Autotools build system, so in general can be built and installed with the usual commands. For example, to build in a manner that is suitable for installing as root, use:

$ ./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var
$ make
$ sudo make install

While to build & install as an unprivileged user

$ ./configure --prefix=$HOME/usr
$ make
$ make install

The libvirt code relies on a large number of 3rd party libraries. These will be detected during execution of the configure script and a summary printed which lists any missing (optional) dependencies.

Contributing

The libvirt project welcomes contributions in many ways. For most components the best way to contribute is to send patches to the primary development mailing list. Further guidance on this can be found on the website:

https://libvirt.org/contribute.html

Contact

The libvirt project has two primary mailing lists:

libvirt-users@redhat.com (for user discussions)
libvir-list@redhat.com (for development only)

Further details on contacting the project are available on the website:

https://libvirt.org/contact.html