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libvirt/src/datatypes.c
Peter Krempa 8ad126e695 rpc: Fix connection close callback race condition and memory corruption/crash 
The last Viktor's effort to fix the race and memory corruption unfortunately
wasn't complete in the case the close callback was not registered in an
connection. At that time, the trail of event's that I'll describe later could
still happen and corrupt the memory or cause a crash of the client (including
the daemon in case of a p2p migration).

Consider the following prerequisities and trail of events:
Let's have a remote connection to a hypervisor that doesn't have a close
callback registered and the client is using the event loop. The crash happens in
cooperation of 2 threads. Thread E is the event loop and thread W is the worker
that does some stuff. R denotes the remote client.

1.) W - The client finishes everything and sheds the last reference on the client
2.) W - The virObject stuff invokes virConnectDispose that invokes doRemoteClose
3.) W - the remote close method invokes the REMOTE_PROC_CLOSE RPC method.
4.) W - The thread is preempted at this point.
5.) R - The remote side receives the close and closes the socket.
6.) E - poll() wakes up due to the closed socket and invokes the close callback
7.) E - The event loop is preempted right before remoteClientCloseFunc is called
8.) W - The worker now finishes, and frees the conn object.
9.) E - The remoteClientCloseFunc accesses the now-freed conn object in the
        attempt to retrieve pointer for the real close callback.
10.) Kaboom, corrupted memory/segfault.

This patch tries to fix this by introducing a new object that survives the
freeing of the connection object. We can't increase the reference count on the
connection object itself or the connection would never be closed, as the
connection is closed only when the reference count reaches zero.

The new object - virConnectCloseCallbackData - is a lockable object that keeps
the pointers to the real user registered callback and ensures that the
connection callback is either not called if the connection was already freed or
that the connection isn't freed while this is being called.
2013-04-05 10:36:03 +02:00

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/*
* datatypes.h: management of structs for public data types
*
* Copyright (C) 2006-2012 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include <config.h>
#include <unistd.h>
#include "datatypes.h"
#include "virerror.h"
#include "virlog.h"
#include "viralloc.h"
#include "viruuid.h"
#include "virutil.h"
#define VIR_FROM_THIS VIR_FROM_NONE
#define virLibConnError(code, ...) \
virReportErrorHelper(VIR_FROM_THIS, code, __FILE__, \
__FUNCTION__, __LINE__, __VA_ARGS__)
virClassPtr virConnectClass;
virClassPtr virConnectCloseCallbackDataClass;
virClassPtr virDomainClass;
virClassPtr virDomainSnapshotClass;
virClassPtr virInterfaceClass;
virClassPtr virNetworkClass;
virClassPtr virNodeDeviceClass;
virClassPtr virNWFilterClass;
virClassPtr virSecretClass;
virClassPtr virStreamClass;
virClassPtr virStorageVolClass;
virClassPtr virStoragePoolClass;
static void virConnectDispose(void *obj);
static void virConnectCloseCallbackDataDispose(void *obj);
static void virDomainDispose(void *obj);
static void virDomainSnapshotDispose(void *obj);
static void virInterfaceDispose(void *obj);
static void virNetworkDispose(void *obj);
static void virNodeDeviceDispose(void *obj);
static void virNWFilterDispose(void *obj);
static void virSecretDispose(void *obj);
static void virStreamDispose(void *obj);
static void virStorageVolDispose(void *obj);
static void virStoragePoolDispose(void *obj);
static int
virDataTypesOnceInit(void)
{
#define DECLARE_CLASS_COMMON(basename, parent) \
if (!(basename ## Class = virClassNew(parent, \
#basename, \
sizeof(basename), \
basename ## Dispose))) \
return -1;
#define DECLARE_CLASS(basename) \
DECLARE_CLASS_COMMON(basename, virClassForObject())
#define DECLARE_CLASS_LOCKABLE(basename) \
DECLARE_CLASS_COMMON(basename, virClassForObjectLockable())
DECLARE_CLASS(virConnect);
DECLARE_CLASS_LOCKABLE(virConnectCloseCallbackData);
DECLARE_CLASS(virDomain);
DECLARE_CLASS(virDomainSnapshot);
DECLARE_CLASS(virInterface);
DECLARE_CLASS(virNetwork);
DECLARE_CLASS(virNodeDevice);
DECLARE_CLASS(virNWFilter);
DECLARE_CLASS(virSecret);
DECLARE_CLASS(virStream);
DECLARE_CLASS(virStorageVol);
DECLARE_CLASS(virStoragePool);
#undef DECLARE_CLASS_COMMON
#undef DECLARE_CLASS_LOCKABLE
#undef DECLARE_CLASS
return 0;
}
VIR_ONCE_GLOBAL_INIT(virDataTypes)
/**
* virGetConnect:
*
* Allocates a new hypervisor connection structure
*
* Returns a new pointer or NULL in case of error.
*/
virConnectPtr
virGetConnect(void)
{
virConnectPtr ret;
if (virDataTypesInitialize() < 0)
return NULL;
if (!(ret = virObjectNew(virConnectClass)))
return NULL;
if (!(ret->closeCallback = virObjectNew(virConnectCloseCallbackDataClass)))
goto error;
if (virMutexInit(&ret->lock) < 0)
goto error;
return ret;
error:
virObjectUnref(ret);
return NULL;
}
/**
* virConnectDispose:
* @conn: the hypervisor connection to release
*
* Unconditionally release all memory associated with a connection.
* The conn.lock mutex must be held prior to calling this, and will
* be released prior to this returning. The connection obj must not
* be used once this method returns.
*/
static void
virConnectDispose(void *obj)
{
virConnectPtr conn = obj;
if (conn->networkDriver)
conn->networkDriver->close(conn);
if (conn->interfaceDriver)
conn->interfaceDriver->close(conn);
if (conn->storageDriver)
conn->storageDriver->close(conn);
if (conn->deviceMonitor)
conn->deviceMonitor->close(conn);
if (conn->secretDriver)
conn->secretDriver->close(conn);
if (conn->nwfilterDriver)
conn->nwfilterDriver->close(conn);
if (conn->driver)
conn->driver->close(conn);
virMutexLock(&conn->lock);
virResetError(&conn->err);
virURIFree(conn->uri);
virObjectLock(conn->closeCallback);
conn->closeCallback->callback = NULL;
virObjectUnlock(conn->closeCallback);
virObjectUnref(conn->closeCallback);
virMutexUnlock(&conn->lock);
virMutexDestroy(&conn->lock);
}
/**
* virConnectCloseCallbackDataDispose:
* @obj: the close callback data to release
*
* Release resources bound to the connection close callback.
*/
static void
virConnectCloseCallbackDataDispose(void *obj)
{
virConnectCloseCallbackDataPtr cb = obj;
virObjectLock(cb);
if (cb->freeCallback)
cb->freeCallback(cb->opaque);
virObjectUnlock(cb);
}
/**
* virGetDomain:
* @conn: the hypervisor connection
* @name: pointer to the domain name
* @uuid: pointer to the uuid
*
* Lookup if the domain is already registered for that connection,
* if yes return a new pointer to it, if no allocate a new structure,
* and register it in the table. In any case a corresponding call to
* virObjectUnref() is needed to not leak data.
*
* Returns a pointer to the domain, or NULL in case of failure
*/
virDomainPtr
virGetDomain(virConnectPtr conn, const char *name, const unsigned char *uuid)
{
virDomainPtr ret = NULL;
if (virDataTypesInitialize() < 0)
return NULL;
if (!VIR_IS_CONNECT(conn)) {
virLibConnError(VIR_ERR_INVALID_CONN, "%s", _("no connection"));
return NULL;
}
virCheckNonNullArgReturn(name, NULL);
virCheckNonNullArgReturn(uuid, NULL);
if (!(ret = virObjectNew(virDomainClass)))
return NULL;
if (!(ret->name = strdup(name)))
goto no_memory;
ret->conn = virObjectRef(conn);
ret->id = -1;
memcpy(&(ret->uuid[0]), uuid, VIR_UUID_BUFLEN);
return ret;
no_memory:
virReportOOMError();
virObjectUnref(ret);
return NULL;
}
/**
* virDomainDispose:
* @domain: the domain to release
*
* Unconditionally release all memory associated with a domain.
* The conn.lock mutex must be held prior to calling this, and will
* be released prior to this returning. The domain obj must not
* be used once this method returns.
*
* It will also unreference the associated connection object,
* which may also be released if its ref count hits zero.
*/
static void
virDomainDispose(void *obj)
{
virDomainPtr domain = obj;
char uuidstr[VIR_UUID_STRING_BUFLEN];
virUUIDFormat(domain->uuid, uuidstr);
VIR_DEBUG("release domain %p %s %s", domain, domain->name, uuidstr);
VIR_FREE(domain->name);
virObjectUnref(domain->conn);
}
/**
* virGetNetwork:
* @conn: the hypervisor connection
* @name: pointer to the network name
* @uuid: pointer to the uuid
*
* Lookup if the network is already registered for that connection,
* if yes return a new pointer to it, if no allocate a new structure,
* and register it in the table. In any case a corresponding call to
* virObjectUnref() is needed to not leak data.
*
* Returns a pointer to the network, or NULL in case of failure
*/
virNetworkPtr
virGetNetwork(virConnectPtr conn, const char *name, const unsigned char *uuid)
{
virNetworkPtr ret = NULL;
if (virDataTypesInitialize() < 0)
return NULL;
if (!VIR_IS_CONNECT(conn)) {
virLibConnError(VIR_ERR_INVALID_CONN, "%s", _("no connection"));
return NULL;
}
virCheckNonNullArgReturn(name, NULL);
virCheckNonNullArgReturn(uuid, NULL);
if (!(ret = virObjectNew(virNetworkClass)))
return NULL;
if (!(ret->name = strdup(name)))
goto no_memory;
ret->conn = virObjectRef(conn);
memcpy(&(ret->uuid[0]), uuid, VIR_UUID_BUFLEN);
return ret;
no_memory:
virReportOOMError();
virObjectUnref(ret);
return NULL;
}
/**
* virNetworkDispose:
* @network: the network to release
*
* Unconditionally release all memory associated with a network.
* The conn.lock mutex must be held prior to calling this, and will
* be released prior to this returning. The network obj must not
* be used once this method returns.
*
* It will also unreference the associated connection object,
* which may also be released if its ref count hits zero.
*/
static void
virNetworkDispose(void *obj)
{
virNetworkPtr network = obj;
char uuidstr[VIR_UUID_STRING_BUFLEN];
virUUIDFormat(network->uuid, uuidstr);
VIR_DEBUG("release network %p %s %s", network, network->name, uuidstr);
VIR_FREE(network->name);
virObjectUnref(network->conn);
}
/**
* virGetInterface:
* @conn: the hypervisor connection
* @name: pointer to the interface name
* @mac: pointer to the mac
*
* Lookup if the interface is already registered for that connection,
* if yes return a new pointer to it (possibly updating the MAC
* address), if no allocate a new structure, and register it in the
* table. In any case a corresponding call to virObjectUnref() is
* needed to not leak data.
*
* Returns a pointer to the interface, or NULL in case of failure
*/
virInterfacePtr
virGetInterface(virConnectPtr conn, const char *name, const char *mac)
{
virInterfacePtr ret = NULL;
if (virDataTypesInitialize() < 0)
return NULL;
if (!VIR_IS_CONNECT(conn)) {
virLibConnError(VIR_ERR_INVALID_CONN, "%s", _("no connection"));
return NULL;
}
virCheckNonNullArgReturn(name, NULL);
/* a NULL mac from caller is okay. Treat it as blank */
if (mac == NULL)
mac = "";
if (!(ret = virObjectNew(virInterfaceClass)))
return NULL;
if (!(ret->name = strdup(name)))
goto no_memory;
if (!(ret->mac = strdup(mac)))
goto no_memory;
ret->conn = virObjectRef(conn);
return ret;
no_memory:
virReportOOMError();
virObjectUnref(ret);
return NULL;
}
/**
* virInterfaceDispose:
* @interface: the interface to release
*
* Unconditionally release all memory associated with an interface.
* The conn.lock mutex must be held prior to calling this, and will
* be released prior to this returning. The interface obj must not
* be used once this method returns.
*
* It will also unreference the associated connection object,
* which may also be released if its ref count hits zero.
*/
static void
virInterfaceDispose(void *obj)
{
virInterfacePtr iface = obj;
VIR_DEBUG("release interface %p %s", iface, iface->name);
VIR_FREE(iface->name);
VIR_FREE(iface->mac);
virObjectUnref(iface->conn);
}
/**
* virGetStoragePool:
* @conn: the hypervisor connection
* @name: pointer to the storage pool name
* @uuid: pointer to the uuid
* @privateData: pointer to driver specific private data
* @freeFunc: private data cleanup function pointer specfic to driver
*
* Lookup if the storage pool is already registered for that connection,
* if yes return a new pointer to it, if no allocate a new structure,
* and register it in the table. In any case a corresponding call to
* virObjectUnref() is needed to not leak data.
*
* Returns a pointer to the network, or NULL in case of failure
*/
virStoragePoolPtr
virGetStoragePool(virConnectPtr conn, const char *name,
const unsigned char *uuid,
void *privateData, virFreeCallback freeFunc)
{
virStoragePoolPtr ret = NULL;
if (virDataTypesInitialize() < 0)
return NULL;
if (!VIR_IS_CONNECT(conn)) {
virLibConnError(VIR_ERR_INVALID_CONN, "%s", _("no connection"));
return NULL;
}
virCheckNonNullArgReturn(name, NULL);
virCheckNonNullArgReturn(uuid, NULL);
if (!(ret = virObjectNew(virStoragePoolClass)))
return NULL;
if (!(ret->name = strdup(name)))
goto no_memory;
ret->conn = virObjectRef(conn);
memcpy(&(ret->uuid[0]), uuid, VIR_UUID_BUFLEN);
/* set the driver specific data */
ret->privateData = privateData;
ret->privateDataFreeFunc = freeFunc;
return ret;
no_memory:
virReportOOMError();
virObjectUnref(ret);
return NULL;
}
/**
* virStoragePoolDispose:
* @pool: the pool to release
*
* Unconditionally release all memory associated with a pool.
* The conn.lock mutex must be held prior to calling this, and will
* be released prior to this returning. The pool obj must not
* be used once this method returns.
*
* It will also unreference the associated connection object,
* which may also be released if its ref count hits zero.
*/
static void
virStoragePoolDispose(void *obj)
{
virStoragePoolPtr pool = obj;
char uuidstr[VIR_UUID_STRING_BUFLEN];
virUUIDFormat(pool->uuid, uuidstr);
VIR_DEBUG("release pool %p %s %s", pool, pool->name, uuidstr);
if (pool->privateDataFreeFunc) {
pool->privateDataFreeFunc(pool->privateData);
}
VIR_FREE(pool->name);
virObjectUnref(pool->conn);
}
/**
* virGetStorageVol:
* @conn: the hypervisor connection
* @pool: pool owning the volume
* @name: pointer to the storage vol name
* @key: pointer to unique key of the volume
* @privateData: pointer to driver specific private data
* @freeFunc: private data cleanup function pointer specfic to driver
*
* Lookup if the storage vol is already registered for that connection,
* if yes return a new pointer to it, if no allocate a new structure,
* and register it in the table. In any case a corresponding call to
* virObjectUnref() is needed to not leak data.
*
* Returns a pointer to the storage vol, or NULL in case of failure
*/
virStorageVolPtr
virGetStorageVol(virConnectPtr conn, const char *pool, const char *name,
const char *key, void *privateData, virFreeCallback freeFunc)
{
virStorageVolPtr ret = NULL;
if (virDataTypesInitialize() < 0)
return NULL;
if (!VIR_IS_CONNECT(conn)) {
virLibConnError(VIR_ERR_INVALID_CONN, "%s", _("no connection"));
return NULL;
}
virCheckNonNullArgReturn(name, NULL);
virCheckNonNullArgReturn(key, NULL);
if (!(ret = virObjectNew(virStorageVolClass)))
return NULL;
if (!(ret->pool = strdup(pool)))
goto no_memory;
if (!(ret->name = strdup(name)))
goto no_memory;
if (!(ret->key = strdup(key)))
goto no_memory;
ret->conn = virObjectRef(conn);
/* set driver specific data */
ret->privateData = privateData;
ret->privateDataFreeFunc = freeFunc;
return ret;
no_memory:
virReportOOMError();
virObjectUnref(ret);
return NULL;
}
/**
* virStorageVolDispose:
* @vol: the vol to release
*
* Unconditionally release all memory associated with a vol.
* The conn.lock mutex must be held prior to calling this, and will
* be released prior to this returning. The vol obj must not
* be used once this method returns.
*
* It will also unreference the associated connection object,
* which may also be released if its ref count hits zero.
*/
static void
virStorageVolDispose(void *obj)
{
virStorageVolPtr vol = obj;
VIR_DEBUG("release vol %p %s", vol, vol->name);
if (vol->privateDataFreeFunc) {
vol->privateDataFreeFunc(vol->privateData);
}
VIR_FREE(vol->key);
VIR_FREE(vol->name);
VIR_FREE(vol->pool);
virObjectUnref(vol->conn);
}
/**
* virGetNodeDevice:
* @conn: the hypervisor connection
* @name: device name (unique on node)
*
* Lookup if the device is already registered for that connection,
* if yes return a new pointer to it, if no allocate a new structure,
* and register it in the table. In any case a corresponding call to
* virObjectUnref() is needed to not leak data.
*
* Returns a pointer to the node device, or NULL in case of failure
*/
virNodeDevicePtr
virGetNodeDevice(virConnectPtr conn, const char *name)
{
virNodeDevicePtr ret = NULL;
if (virDataTypesInitialize() < 0)
return NULL;
if (!VIR_IS_CONNECT(conn)) {
virLibConnError(VIR_ERR_INVALID_CONN, "%s", _("no connection"));
return NULL;
}
virCheckNonNullArgReturn(name, NULL);
if (!(ret = virObjectNew(virNodeDeviceClass)))
return NULL;
if (!(ret->name = strdup(name)))
goto no_memory;
ret->conn = virObjectRef(conn);
return ret;
no_memory:
virReportOOMError();
virObjectUnref(ret);
return NULL;
}
/**
* virNodeDeviceDispose:
* @dev: the dev to release
*
* Unconditionally release all memory associated with a dev.
* The conn.lock mutex must be held prior to calling this, and will
* be released prior to this returning. The dev obj must not
* be used once this method returns.
*
* It will also unreference the associated connection object,
* which may also be released if its ref count hits zero.
*/
static void
virNodeDeviceDispose(void *obj)
{
virNodeDevicePtr dev = obj;
VIR_DEBUG("release dev %p %s", dev, dev->name);
VIR_FREE(dev->name);
VIR_FREE(dev->parent);
virObjectUnref(dev->conn);
}
/**
* virGetSecret:
* @conn: the hypervisor connection
* @uuid: secret UUID
*
* Lookup if the secret is already registered for that connection, if so return
* a pointer to it, otherwise allocate a new structure, and register it in the
* table. In any case a corresponding call to virObjectUnref() is needed to not
* leak data.
*
* Returns a pointer to the secret, or NULL in case of failure
*/
virSecretPtr
virGetSecret(virConnectPtr conn, const unsigned char *uuid,
int usageType, const char *usageID)
{
virSecretPtr ret = NULL;
if (virDataTypesInitialize() < 0)
return NULL;
if (!VIR_IS_CONNECT(conn)) {
virLibConnError(VIR_ERR_INVALID_CONN, "%s", _("no connection"));
return NULL;
}
virCheckNonNullArgReturn(uuid, NULL);
virCheckNonNullArgReturn(usageID, NULL);
if (!(ret = virObjectNew(virSecretClass)))
return NULL;
memcpy(&(ret->uuid[0]), uuid, VIR_UUID_BUFLEN);
ret->usageType = usageType;
if (!(ret->usageID = strdup(usageID)))
goto no_memory;
ret->conn = virObjectRef(conn);
return ret;
no_memory:
virReportOOMError();
virObjectUnref(ret);
return NULL;
}
/**
* virSecretDispose:
* @secret: the secret to release
*
* Unconditionally release all memory associated with a secret. The conn.lock
* mutex must be held prior to calling this, and will be released prior to this
* returning. The secret obj must not be used once this method returns.
*
* It will also unreference the associated connection object, which may also be
* released if its ref count hits zero.
*/
static void
virSecretDispose(void *obj)
{
virSecretPtr secret = obj;
char uuidstr[VIR_UUID_STRING_BUFLEN];
virUUIDFormat(secret->uuid, uuidstr);
VIR_DEBUG("release secret %p %s", secret, uuidstr);
VIR_FREE(secret->usageID);
virObjectUnref(secret->conn);
}
virStreamPtr
virGetStream(virConnectPtr conn)
{
virStreamPtr ret = NULL;
if (virDataTypesInitialize() < 0)
return NULL;
if (!(ret = virObjectNew(virStreamClass)))
return NULL;
ret->conn = virObjectRef(conn);
return ret;
}
static void
virStreamDispose(void *obj)
{
virStreamPtr st = obj;
VIR_DEBUG("release dev %p", st);
virObjectUnref(st->conn);
}
/**
* virGetNWFilter:
* @conn: the hypervisor connection
* @name: pointer to the network filter pool name
* @uuid: pointer to the uuid
*
* Lookup if the network filter is already registered for that connection,
* if yes return a new pointer to it, if no allocate a new structure,
* and register it in the table. In any case a corresponding call to
* virObjectUnref() is needed to not leak data.
*
* Returns a pointer to the network, or NULL in case of failure
*/
virNWFilterPtr
virGetNWFilter(virConnectPtr conn, const char *name,
const unsigned char *uuid)
{
virNWFilterPtr ret = NULL;
if (virDataTypesInitialize() < 0)
return NULL;
if (!VIR_IS_CONNECT(conn)) {
virLibConnError(VIR_ERR_INVALID_CONN, "%s", _("no connection"));
return NULL;
}
virCheckNonNullArgReturn(name, NULL);
virCheckNonNullArgReturn(uuid, NULL);
if (!(ret = virObjectNew(virNWFilterClass)))
return NULL;
if (!(ret->name = strdup(name)))
goto no_memory;
memcpy(&(ret->uuid[0]), uuid, VIR_UUID_BUFLEN);
ret->conn = virObjectRef(conn);
return ret;
no_memory:
virReportOOMError();
virObjectUnref(ret);
return NULL;
}
/**
* virNWFilterDispose:
* @nwfilter: the nwfilter to release
*
* Unconditionally release all memory associated with a nwfilter.
* The conn.lock mutex must be held prior to calling this, and will
* be released prior to this returning. The nwfilter obj must not
* be used once this method returns.
*
* It will also unreference the associated connection object,
* which may also be released if its ref count hits zero.
*/
static void
virNWFilterDispose(void *obj)
{
virNWFilterPtr nwfilter = obj;
char uuidstr[VIR_UUID_STRING_BUFLEN];
virUUIDFormat(nwfilter->uuid, uuidstr);
VIR_DEBUG("release nwfilter %p %s %s", nwfilter, nwfilter->name, uuidstr);
VIR_FREE(nwfilter->name);
virObjectUnref(nwfilter->conn);
}
virDomainSnapshotPtr
virGetDomainSnapshot(virDomainPtr domain, const char *name)
{
virDomainSnapshotPtr ret = NULL;
if (virDataTypesInitialize() < 0)
return NULL;
if (!VIR_IS_DOMAIN(domain)) {
virLibConnError(VIR_ERR_INVALID_DOMAIN, "%s", _("bad domain"));
return NULL;
}
virCheckNonNullArgReturn(name, NULL);
if (!(ret = virObjectNew(virDomainSnapshotClass)))
return NULL;
if (!(ret->name = strdup(name)))
goto no_memory;
ret->domain = virObjectRef(domain);
return ret;
no_memory:
virReportOOMError();
virObjectUnref(ret);
return NULL;
}
static void
virDomainSnapshotDispose(void *obj)
{
virDomainSnapshotPtr snapshot = obj;
VIR_DEBUG("release snapshot %p %s", snapshot, snapshot->name);
VIR_FREE(snapshot->name);
virObjectUnref(snapshot->domain);
}
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