Convert the host capabilities and domain config structs to
use the virArch datatype. Update the parsers and all drivers
to take account of datatype change
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
this patch addes fuse support for libvirt lxc.
we can use fuse filesystem to generate sysinfo dynamically,
So we can isolate /proc/meminfo,cpuinfo and so on through
fuse filesystem.
we mount fuse filesystem for every container.
the mount name is libvirt,mount point is
localstatedir/run/libvirt/lxc/containername.
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
When no security driver is specified libvirt_lxc segfaults as a debug
message tries to access security labels for the container that are not
present.
This problem was introduced in commit 6c3cf57d6c.
Early jumps to the cleanup label caused a crash of the libvirt_lxc
container helper as the cleanup section called
virLXCControllerDeleteInterfaces(ctrl) without checking the ctrl argument
for NULL. The argument was de-referenced soon after.
$ /usr/libexec/libvirt_lxc
/usr/libexec/libvirt_lxc: missing --name argument for configuration
Segmentation fault
The virLXCControllerClientCloseHook method was mistakenly
assuming that the private data associated with the network
client was the virLXCControllerPtr. In fact it was just a
dummy int, so we were derefencing a bogus struct. The
frequent result of this was that we would never quit, because
we tried to arm a non-existant timer.
Fix the code by removing the dummy private data and just
using the virLXCControllerPtr instance as private data
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Currently the LXC driver logs audit messages when a container
is started or stopped. These audit messages, however, contain
the PID of the libvirt_lxc supervisor process. To enable
sysadmins to correlate with audit messages generated by
processes /inside/ the container, we need to include the
container init process PID.
We can't do this in the main 'start' audit message, since
the init PID is not available at that point. Instead we output
a completely new audit record, that lists both PIDs.
type=VIRT_CONTROL msg=audit(1353433750.071:363): pid=20180 uid=0 auid=501 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 msg='virt=lxc op=init vm="busy" uuid=dda7b947-0846-1759-2873-0f375df7d7eb vm-pid=20371 init-pid=20372 exe="/home/berrange/src/virt/libvirt/daemon/.libs/lt-libvirtd" hostname=? addr=? terminal=pts/6 res=success'
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The LXC controller code currently directly invokes the
libvirt main loop code. The problem is that this misses
the cleanup of virNetServerClient connections that
virNetServerRun takes care of.
The result is that when libvirtd is stopped, the
libvirt_lxc controller process gets stuck in a I/O loop.
When libvirtd is then started again, it fails to connect
to the controller and thus kills off the entire domain.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Add two new APIs virNetServerClientNewPostExecRestart and
virNetServerClientPreExecRestart which allow a virNetServerClientPtr
object to be created from a JSON object and saved to a
JSON object, for the purpose of re-exec'ing a process.
This includes serialization of the connected socket associated
with the client
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Many parts of virDomainDefPtr were using 'int' variables as
array length counts. Replace all these with size_t and update
various format strings & API signatures to adapt
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Continue consolidation of process functions by moving some
helpers out of command.{c,h} into virprocess.{c,h}
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
https://www.gnu.org/licenses/gpl-howto.html recommends that
the 'If not, see <url>.' phrase be a separate sentence.
* tests/securityselinuxhelper.c: Remove doubled line.
* tests/securityselinuxtest.c: Likewise.
* globally: s/; If/. If/
This patch updates the structures that store information about each
domain and each hypervisor to support multiple security labels and
drivers. It also updates all the remaining code to use the new fields.
Signed-off-by: Marcelo Cerri <mhcerri@linux.vnet.ibm.com>
Currently there is a hook function that is invoked when a
new client connection comes in, which allows an app to
setup private data. This setup will make it difficult to
serialize client state during process re-exec(). Change to
a model where the app registers a callback when creating
the virNetServerPtr instance, which is used to allocate
the client private data immediately during virNetClientPtr
construction.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
All callers used the same initialization seed (well, the new
viratomictest forgot to look at getpid()); so we might as well
make this value automatic. And while it may feel like we are
giving up functionality, I documented how to get it back in the
unlikely case that you actually need to debug with a fixed
pseudo-random sequence. I left that crippled by default, so
that a stray environment variable doesn't cause a lack of
randomness to become a security issue.
* src/util/virrandom.c (virRandomInitialize): Rename...
(virRandomOnceInit): ...and make static, with one-shot call.
Document how to do fixed-seed debugging.
* src/util/virrandom.h (virRandomInitialize): Drop prototype.
* src/libvirt_private.syms (virrandom.h): Don't export it.
* src/libvirt.c (virInitialize): Adjust caller.
* src/lxc/lxc_controller.c (main): Likewise.
* src/security/virt-aa-helper.c (main): Likewise.
* src/util/iohelper.c (main): Likewise.
* tests/seclabeltest.c (main): Likewise.
* tests/testutils.c (virtTestMain): Likewise.
* tests/viratomictest.c (mymain): Likewise.
The reboot() syscall is allowed by new kernels for LXC containers.
The LXC controller can detect whether a reboot was requested
(instead of a normal shutdown) by looking at the "init" process
exit status. If a reboot was triggered, the exit status will
record SIGHUP as the kill reason.
The LXC controller has cleared all its capabilities, and the
veth network devices will no longer exist at this time. Thus
it cannot restart the container init process itself. Instead
it emits an event which is picked up by the LXC driver in
libvirtd. This will then re-create the container, using the
same configuration as it was previously running with (ie it
will not activate 'newDef').
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This defines a new RPC protocol to be used between the LXC
controller and the libvirtd LXC driver. There is only a
single RPC message defined thus far, an asynchronous "EXIT"
event that is emitted just before the LXC controller process
exits. This provides the LXC driver with details about how
the container shutdown - normally, or abnormally (crashed),
thus allowing the driver to emit better libvirt events.
Emitting the event in the LXC controller requires a few
little tricks with the RPC service. Simply calling the
virNetServiceClientSendMessage does not work, since this
merely queues the message for asynchronous processing.
In addition the main event loop is no longer running at
the point the event is emitted, so no I/O is processed.
Thus after invoking virNetServiceClientSendMessage it is
necessary to mark the client as being in "delayed close"
mode. Then the event loop is run again, until the client
completes its close - this happens only after the queued
message has been fully transmitted. The final complexity
is that it is not safe to run virNetServerQuit() from the
client close callback, since that is invoked from a
context where the server is locked. Thus a zero-second
timer is used to trigger shutdown of the event loop,
causing the controller to finally exit.
* src/Makefile.am: Add rules for generating RPC protocol
files and dispatch methods
* src/lxc/lxc_controller.c: Emit an RPC event immediately
before exiting
* src/lxc/lxc_domain.h: Record the shutdown reason
given by the controller
* src/lxc/lxc_monitor.c, src/lxc/lxc_monitor.h: Register
RPC program and event handler. Add callback to let
driver receive EXIT event.
* src/lxc/lxc_process.c: Use monitor exit event to decide
what kind of domain event to emit
* src/lxc/lxc_protocol.x: Define wire protocol for LXC
controller monitor.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Per the FSF address could be changed from time to time, and GNU
recommends the following now: (http://www.gnu.org/licenses/gpl-howto.html)
You should have received a copy of the GNU General Public License
along with Foobar. If not, see <http://www.gnu.org/licenses/>.
This patch removes the explicit FSF address, and uses above instead
(of course, with inserting 'Lesser' before 'General').
Except a bunch of files for security driver, all others are changed
automatically, the copyright for securify files are not complete,
that's why to do it manually:
src/security/security_selinux.h
src/security/security_driver.h
src/security/security_selinux.c
src/security/security_apparmor.h
src/security/security_apparmor.c
src/security/security_driver.c
Move the cgroup setup code out of the lxc_controller.c file
and into lxc_cgroup.{c,h}. This reduces the size of the
lxc_controller.c file and paves the way to invoke cgroup
setup from lxc_driver.c instead of lxc_controller.c in the
future
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Since we are not yet using the virNetServerPtr object for running
the event loop, we can't use virNetServerQuit(). Instead set the
global 'quit' flag in libvirt_lxc
In preparation for introducing a full RPC protocol for
libvirt_lxc, switch over to using the virNetServer APIs
for the monitor connection
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
While it is not currently used elsewhere in libvirt, the code
for finding a free loop device & associating a file with it
is not LXC specific. Move it into the viffile.{c,h} file where
potentially shared code is more commonly kept.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Move the cgroup object into virLXCControllerPtr and rename
all the setup methods to include 'Cgroup' in their name
if appropriate
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Move the monitor FDs into the virLXCControllerPtr object
removing the need for the 'struct lxcMonitor' object
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The virLXCControllerRun method is getting a little too large,
and about 50% of its code is related to setting up a /dev/pts
mount. Move the latter out into a dedicated method
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Move the security manager object into the virLXCControllerPtr
object. Also simplify the code creating it in the first place
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Move the list of loop device FDs into the virLXCControllerPtr
object and make sure that virLXCControllerStopInit will
close them all
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Turn 'struct lxc_console' into virLXCControllerConsolePtr and make it
a part of virLXCControllerPtr
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Keep a record of the init PID in the virLXCController object
and create a virLXCControllerStopInit method for killing this
process
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Move the veth device name state into the virLXCControllerPtr
object and stop passing it around. Also use size_t instead
of unsigned int for the array length parameters.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The LXC controller code is having to pass around an ever increasing
number of parameters between methods. To make the code more managable
introduce a virLXCControllerPtr to hold all this state, starting with
the container name and virDomainDefPtr object
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The lxc contoller eventually makes use of virRandomBits(), which was
segfaulting since virRandomInitialize() is never invoked.
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff554d560 in random_r () from /lib64/libc.so.6
(gdb) bt
0 0x00007ffff554d560 in random_r () from /lib64/libc.so.6
1 0x0000000000469eaa in virRandomBits (nbits=32) at util/virrandom.c:80
2 0x000000000045bf69 in virHashCreateFull (size=256,
dataFree=0x4aa2a2 <hashDataFree>, keyCode=0x45bd40 <virHashStrCode>,
keyEqual=0x45bdad <virHashStrEqual>, keyCopy=0x45bdfa <virHashStrCopy>,
keyFree=0x45be37 <virHashStrFree>) at util/virhash.c:134
3 0x000000000045c069 in virHashCreate (size=0, dataFree=0x4aa2a2 <hashDataFree>)
at util/virhash.c:164
4 0x00000000004aa562 in virNWFilterHashTableCreate (n=0)
at conf/nwfilter_params.c:686
5 0x00000000004aa95b in virNWFilterParseParamAttributes (cur=0x711d30)
at conf/nwfilter_params.c:793
6 0x0000000000481a7f in virDomainNetDefParseXML (caps=0x702c90, node=0x7116b0,
ctxt=0x7101b0, bootMap=0x0, flags=0) at conf/domain_conf.c:4589
7 0x000000000048cc36 in virDomainDefParseXML (caps=0x702c90, xml=0x710040,
root=0x7103b0, ctxt=0x7101b0, expectedVirtTypes=16, flags=0)
at conf/domain_conf.c:8658
8 0x000000000048f011 in virDomainDefParseNode (caps=0x702c90, xml=0x710040,
root=0x7103b0, expectedVirtTypes=16, flags=0) at conf/domain_conf.c:9360
9 0x000000000048ee30 in virDomainDefParse (xmlStr=0x0,
filename=0x702ae0 "/var/run/libvirt/lxc/x.xml", caps=0x702c90,
expectedVirtTypes=16, flags=0) at conf/domain_conf.c:9310
10 0x000000000048ef00 in virDomainDefParseFile (caps=0x702c90,
filename=0x702ae0 "/var/run/libvirt/lxc/x.xml", expectedVirtTypes=16, flags=0)
at conf/domain_conf.c:9332
11 0x0000000000425053 in main (argc=5, argv=0x7fffffffe2b8)
at lxc/lxc_controller.c:1773
Instead of hardcoding use of SELinux contexts in the LXC driver,
switch over to using the official security driver API.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
To allow the security drivers to apply different configuration
information per hypervisor, pass the virtualization driver name
into the security manager constructor.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The virLogSetFromEnv call was done too late in startup to
catch many log messages (eg from security driver initialization).
To assist debugging also explicitly log the security details
at startup
Currently the libvirt_lxc process uses VIR_DOMAIN_XML_INACTIVE
when loading the XML for the container. This means it loses
any dynamic data such as the, just allocated, SELinux label.
Further there is an inconsistency in the libvirt LXC driver
whereby it saves the live config XML and then later overwrites
the file with the live status XML instead. Add a comment about
this for future reference.
* src/lxc/lxc_controller.c: Remove VIR_DOMAIN_XML_INACTIVE
when loading XML
* src/lxc/lxc_driver.c: Add comment about inconsistent
config file formats
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Error: UNINIT:
/libvirt/src/lxc/lxc_driver.c:1412:
var_decl: Declaring variable "fd" without initializer.
/libvirt/src/lxc/lxc_driver.c:1460:
uninit_use_in_call: Using uninitialized value "fd" when calling "virFileClose".
/libvirt/src/util/virfile.c:50:
read_parm: Reading a parameter value.
Error: DEADCODE:
/libvirt/src/lxc/lxc_controller.c:960:
dead_error_condition: On this path, the condition "ret == 4" cannot be true.
/libvirt/src/lxc/lxc_controller.c:959:
at_most: After this line, the value of "ret" is at most -1.
/libvirt/src/lxc/lxc_controller.c:959:
new_values: Noticing condition "ret < 0".
/libvirt/src/lxc/lxc_controller.c:961:
dead_error_line: Execution cannot reach this statement "continue;".
Error: UNINIT:
/libvirt/src/lxc/lxc_controller.c:1104:
var_decl: Declaring variable "consoles" without initializer.
/libvirt/src/lxc/lxc_controller.c:1237:
uninit_use: Using uninitialized value "consoles".
This patch fixes the access of variable "con" in two files where the
variable was declared only on SELinux builds and thus the build failed
without SELinux. It's a rather nasty fix but helps fix the build
quickly and without any major changes to the code.
To allow the container to access /dev and /dev/pts when under
sVirt, set an explicit mount option. Also set a max size on
the /dev mount to prevent DOS on memory usage
* src/lxc/lxc_container.c: Set /dev mount context
* src/lxc/lxc_controller.c: Set /dev/pts mount context
For the sake of backwards compat, LXC guests are *not*
confined by default. This is because it is not practical
to dynamically relabel containers using large filesystem
trees. Applications can create confined containers though,
by giving suitable XML configs
* src/Makefile.am: Link libvirt_lxc to security drivers
* src/lxc/libvirtd_lxc.aug, src/lxc/lxc_conf.h,
src/lxc/lxc_conf.c, src/lxc/lxc.conf,
src/lxc/test_libvirtd_lxc.aug: Config file handling for
security driver
* src/lxc/lxc_driver.c: Wire up security driver functions
* src/lxc/lxc_controller.c: Add a '--security' flag to
specify which security driver to activate
* src/lxc/lxc_container.c, src/lxc/lxc_container.h: Set
the process label just before exec'ing init.
Currently the LXC controller attempts to deal with EOF on a
tty by spawning a thread to do an edge triggered epoll_wait().
This avoids the normal event loop spinning on POLLHUP. There
is a subtle mistake though - even after seeing POLLHUP on a
master PTY, it is still perfectly possible & valid to write
data to the PTY. There is a buffer that can be filled with
data, even when no client is present.
The second mistake is that the epoll_wait() thread was not
looking for the EPOLLOUT condition, so when a new client
connects to the LXC console, it had to explicitly send a
character before any queued output would appear.
Finally, there was in fact no need to spawn a new thread to
deal with epoll_wait(). The epoll file descriptor itself
can be poll()'d on normally.
This patch attempts to deal with all these problems.
- The blocking epoll_wait() thread is replaced by a poll
on the epoll file descriptor which then does a non-blocking
epoll_wait() to handle events
- Even if POLLHUP is seen, we continue trying to write
any pending output until getting EAGAIN from write.
- Once write returns EAGAIN, we modify the epoll event
mask to also look for EPOLLOUT
* src/lxc/lxc_controller.c: Avoid stalled I/O upon
connected to an LXC console
