When preparing images for block jobs we modify their seclabels so
that QEMU can open them. However, as mentioned in the previous
commit, secdrivers base some it their decisions whether the image
they are working on is top of of the backing chain. Fortunately,
in places where we call secdrivers we know this and the
information can be passed to secdrivers.
The problem is the following: after the first blockcommit from
the base to one of the parents the XATTRs on the base image are
not cleared and therefore the second attempt to do another
blockcommit fails. This is caused by blockcommit code calling
qemuSecuritySetImageLabel() over the base image, possibly
multiple times (to ensure RW/RO access). A naive fix would be to
call the restore function. But this is not possible, because that
would deny QEMU the access to the base image. Fortunately, we
can use the fact that seclabels are remembered only for the top
of the backing chain and not for the rest of the backing chain.
And thanks to the previous commit we can tell secdrivers which
images are top of the backing chain.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1803551
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Our decision whether to remember seclabel for a disk image
depends on a few factors. If the image is readonly or shared or
not the chain top the remembering is suppressed for the image.
However, the virSecurityManagerSetImageLabel() is too low level
to determine whether passed @src is chain top or not. Even though
the function has the @parent argument it does not necessarily
reflect the chain top - it only points to the top level image in
the chain we want to relabel and not to the topmost image of the
whole chain. And this can't be derived from the passed domain
definition reliably neither - in some cases (like snapshots or
block copy) the @src is added to the definition only after the
operation succeeded. Therefore, introduce a flag which callers
can use to help us with the decision.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
If only IPv6 is configured on the host, getaddrinfo with AI_ADDRCONFIG
in hints would return EAI_ADDRFAMILY for nodenames that resolve to IPv4.
Also pass AI_V4MAPPED to accept IPv4-mapped addresses on IPv6-only
systems.
Signed-off-by: Zhimin Feng <fengzhimin1@huawei.com>
[rewrote the commit message - jtomko]
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This is the same timeout of all other daemons, and just like them
virtlogd is socket-activated, so it will automatically be started
on demand whenever that's necessary.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
In the following recent change:
commit db72866310
Author: Daniel P. Berrangé <berrange@redhat.com>
Date: Tue Jan 14 10:40:52 2020 +0000
util: add API for reading password from the console
the fact that "bufptr" pointer may point to either heap or stack
allocated data was overlooked. As a result, when the strdup was
removed, we ended up returning a pointer to the local stack to
the caller. When the caller referenced this stack pointer they
got out garbage which fairly quickly resulted in a crash.
We need to copy the stack buffer into heap memory in the username
case.
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Virtualization event types were added in 2.0.5:
https://github.com/linux-audit/audit-userspace/commit/3755e9ff
Even Ubuntu 14.04 (which we don't support) has 2.3.2.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
When spawning a thread via our virThread APIs we let pthread
spawn this helper thread which sets couple of thread local
variables (e.g. thread job name or thread worker name) and as of
v6.1.0-40-gc85256b31b it also sets pthread name (which is then
visible in `ps' output for instance). Only after these steps the
intended function is called. However, just before calling it we
free the buffer that holds the thread name which results in
invalid memory reads:
==47027== Invalid read of size 1
==47027== at 0x48389C2: strlen (vg_replace_strmem.c:459)
==47027== by 0x58BB3D6: __vfprintf_internal (vfprintf-internal.c:1645)
==47027== by 0x58CE6E0: __vasprintf_internal (vasprintf.c:57)
==47027== by 0x574BA28: g_vasprintf (in /usr/lib64/libglib-2.0.so.0.6000.7)
==47027== by 0x57240CC: g_strdup_vprintf (in /usr/lib64/libglib-2.0.so.0.6000.7)
==47027== by 0x48E0EFA: vir_g_strdup_vprintf (glibcompat.c:209)
==47027== by 0x493AA05: virLogVMessage (virlog.c:573)
==47027== by 0x493A8FE: virLogMessage (virlog.c:513)
==47027== by 0x4992FC7: virThreadJobClear (virthreadjob.c:121)
==47027== by 0x4992844: virThreadHelper (virthread.c:237)
==47027== by 0x5817496: start_thread (pthread_create.c:486)
==47027== by 0x59563CE: clone (clone.S:95)
The problem is that neither virThreadJobSetWorker() nor
virThreadJobSet() create a copy of passed name. They just set a
thread local variable to point to the buffer which is then
freed. Moving the free towards the end of the wrapper function
solves the issue.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
The 'auths' struct in the test driver was not free()d. This was easy to
miss because the default XML doesn't include auth info.
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
'template' might be used uninitialized.
Use g_autofree for everything and remove all the custom labels.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Convert the function to use g_autofree to silence -Wmaybe-uninitialized.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Now that we have more than just the libvirtd daemon, we should be
explaining to users what they are all for & important aspects of their
configuration.
Reviewed-by: Erik Skultety <eskultet@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Our implementation masks GCC warnings of uninitialized use of the passed
argument. After changing this I got a load of following warnings:
src/conf/virnetworkportdef.c: In function 'virNetworkPortDefSaveStatus':
/usr/include/glib-2.0/glib/gmem.h:136:8: error: 'path' may be used uninitialized in this function [-Werror=maybe-uninitialized]
136 | if (_p) \
| ^
src/conf/virnetworkportdef.c:447:11: note: 'path' was declared here
447 | char *path;
| ^~~~
For the curious, g_clear_pointer is still safe for arguments with
side-effect. Here's the pre-processed output of trying to do a
VIR_FREE(*(test2++)):
do {
typedef char _GStaticAssertCompileTimeAssertion_1[(sizeof *(&(*(test2++))) == sizeof (gpointer)) ? 1 : -1] __attribute__((__unused__));
__typeof__((&(*(test2++)))) _pp = (&(*(test2++)));
__typeof__(*(&(*(test2++)))) _ptr = *_pp;
*_pp = ((void *)0);
if (_ptr)
(g_free) (_ptr);
} while (0) ;
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Refactor the cleanup control flow and use g_autofree for 'arch' so that
it's mandated that it's initialized.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Use 'g_autoptr' which mandates initialization for 'hostname' and also
for 'domain' to allow full refactor of the cleanup path.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
'path' could be accessed uninitialized. Fix it by using g_autofree which
also mandates initialization.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Use 'g_autofree' to clean both 'path' and 'xml' which mandates
initialization and get rid of the 'cleanup' label and 'ret variable.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Historically threads are given a name based on the C function,
and this name is just used inside libvirt. With OS level thread
naming this name is now visible to debuggers, but also has to
fit in 15 characters on Linux, so function names are too long
in some cases.
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Setting the thread name makes it easier to debug libvirtd
when many threads are running.
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
The qemuMonitorOpenFD method has not been used since it
was first introduced.
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Libvirt has never configured the QEMU agent to support
running on a PTY implicitly. In theory an end user may
have written such an XML config, but this is reasonably
unlikely since when a bare <channel> is provided, libvirt
will auto-expand it to a UNIX socket backend.
With this change a user who has use the PTY backend will
have to switch to the UNIX backend if they wish to use
libvirt APIs for interacting with the agent. This will
not have guest ABI impact.
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Use the new command in the test suite by asserting the capability
and adjusting test data to the correct field names as they changed
compared to 'query-cpus'.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
qemuMonitorJSONMakeCommandInternal does the full command construction if
you pass in what would become the value of the 'arguments' key. Refactor
the open-coded implementation to use the helper and use modern cleanup
helpers at the same time.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Make it obvious that the function always returns a valid pointer and fix
all callers.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
I've found that if my virtlogd is socket activated but the daemon
doesn't run yet, then the virt-qemu-run is killed right after it
tries to start the domain. The problem is that because the default
setting is to use virtlogd, the domain create code tries to
connect to virtlogd socket, which in turn tries to detect who is
connecting (virNetSocketGetUNIXIdentity()) and as a part of it,
it will try to open /proc/${PID_OF_SHIM}/stat which is denied by
SELinux:
type=AVC msg=audit(1582903501.927:323): avc: denied { search } for \
pid=1210 comm="virtlogd" name="1843" dev="proc" ino=37224 \
scontext=system_u:system_r:virtlogd_t:s0-s0:c0.c1023 \
tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=dir \
permissive=0
Virtlogd reacts by closing the connection which the shim sees as
SIGPIPE. Since the default response to the signal is Term, we
don't even get to reporting any error nor to removing the
temporary directory.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
When virt-qemu-run is ran without any root directory specified on
the command line, a temporary directory is made and used instead.
But since we are using g_dir_make_tmp() to create the directory
it is going to have 0700 mode. So even though we create the whole
directory structure under it and label everything, QEMU is very
likely to not have the access. This is because in this case there
is no qemu.conf and thus distro default UID:GID is used to run
QEMU (e.g. qemu:kvm on Fedora). Change the mode of the temporary
directory so that everybody has eXecute permission.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Libvirt tries to forbid migration onto the same host and it does
that by checking if local and remote hostnames are the same and
whether local and remote UUIDs are the same. Well, the latter
makes sense but the former doesn't really because libvirtd can be
running inside an UTS namespace and hostnames can appear the same
on both sides of migration. On the other hand, host UUIDs are
unique, so rely on them when trying to prevent migration onto the
same host.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1639596
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Gaurav Agrawal <agrawalgaurav@gnome.org>
[removed dead assignment]
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
We recognize three return values from tests:
* OK -> 0
* SKIP -> EXIT_AM_SKIP
* ERROR -> anything else
Also check for EXIT_AM_SKIP when building a bitmap of failed tests,
otherwise the skipped tests would be printed in the suggested range
of tests that shoud be re-run.
Reported-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Fixes: cebb468ef5
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Use the 'flat' flag for 'query-named-block-nodes' if qemu supports
QEMU_CAPS_QMP_QUERY_NAMED_BLOCK_NODES_FLAT in qemuBlockGetNamedNodeData.
We don't need the data so plumb in whether qemu supports the
'flat' output.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Modern qemu allows to skip the nested redundant data in the output of
query-named-block-nodes. Plumb in the support for the argument that
enables it.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Replace qemuMonitorBlockGetNamedNodeData by qemuBlockGetNamedNodeData.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Detect the presence of the flag and make it available internally as
QEMU_CAPS_QMP_QUERY_NAMED_BLOCK_NODES_FLAT.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
The monitor password callback was removed long time ago but the callback
type and variable were left around. Finish the cleanup.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Update to v4.2.0-1858-gdb736e0437 which contains my commit for 'flat'
output of 'query-named-block-nodes'.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Format the 'vhost-user-fs' device on the QEMU command line.
This device provides shared file system access using the FUSE protocol
carried over virtio.
The actual file server is implemented in an external vhost-user-fs device
backend process.
https://bugzilla.redhat.com/show_bug.cgi?id=1694166
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Tested-by: Andrea Bolognani <abologna@redhat.com>
Look into /usr/share/qemu/vhost-user to see whether we can find
a suitable virtiofsd binary, in case the user did not provide one
in the domain XML.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Tested-by: Andrea Bolognani <abologna@redhat.com>
Wire up the code to put virtiofsd in the emulator cgroup on domain
startup.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Tested-by: Andrea Bolognani <abologna@redhat.com>
Start virtiofsd for each <filesystem> device using it.
Pre-create the socket for communication with QEMU and pass it
to virtiofsd.
Note that virtiofsd needs to run as root.
https://bugzilla.redhat.com/show_bug.cgi?id=1694166
Introduced by QEMU commit a43efa34c7d7b628cbf1ec0fe60043e5c91043ea
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Tested-by: Andrea Bolognani <abologna@redhat.com>
This is not yet supported.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Tested-by: Andrea Bolognani <abologna@redhat.com>
Add a 'virtiofsd_debug' option for tuning whether to run virtiofsd
in debug mode.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Tested-by: Andrea Bolognani <abologna@redhat.com>
Add more elements for tuning the virtiofsd daemon
and the vhost-user-fs device:
<driver type='virtiofs' queue='1024' xattr='on'>
<binary path='/usr/libexec/virtiofsd'>
<cache mode='always'/>
<lock posix='off' flock='off'/>
</binary>
</driver>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Tested-by: Andrea Bolognani <abologna@redhat.com>
Introduce a new 'virtiofs' driver type for filesystem.
<filesystem type='mount' accessmode='passthrough'>
<driver type='virtiofs'/>
<source dir='/path'/>
<target dir='mount_tag'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</filesystem>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Tested-by: Andrea Bolognani <abologna@redhat.com>
Add a document describing the usage of virtiofs.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Tested-by: Andrea Bolognani <abologna@redhat.com>
