static int
qemuTeardownDiskPathDeny(virDomainDiskDefPtr disk ATTRIBUTE_UNUSED,
const char *path,
size_t depth ATTRIBUTE_UNUSED,
void *opaque)
{
qemuCgroupData *data = opaque;
int rc;
VIR_DEBUG("Process path %s for disk", path);
rc = virCgroupDenyDevicePath(data->cgroup, path,
VIR_CGROUP_DEVICE_RWM);
virDomainAuditCgroupPath(data->vm, data->cgroup, "deny", path, "rwm", rc);
if (rc < 0) {
if (rc == -EACCES) { /* Get this for root squash NFS */
VIR_DEBUG("Ignoring EACCES for %s", path);
} else {
virReportSystemError(-rc,
_("Unable to deny access for disk path %s"),
path);
return -1;
}
}
return 0;
}
int
qemuTeardownImageCgroup(virDomainObjPtr vm,
virStorageSourcePtr src)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
int perms = VIR_CGROUP_DEVICE_READ |
VIR_CGROUP_DEVICE_WRITE |
VIR_CGROUP_DEVICE_MKNOD;
int ret;
if (!virCgroupHasController(priv->cgroup,
VIR_CGROUP_CONTROLLER_DEVICES))
return 0;
if (!src->path || !virStorageSourceIsLocalStorage(src)) {
VIR_DEBUG("Not updating cgroups for disk path '%s', type: %s",
NULLSTR(src->path), virStorageTypeToString(src->type));
return 0;
}
VIR_DEBUG("Deny path %s", src->path);
ret = virCgroupDenyDevicePath(priv->cgroup, src->path, perms, true);
virDomainAuditCgroupPath(vm, priv->cgroup, "deny", src->path,
virCgroupGetDevicePermsString(perms), ret == 0);
return ret;
}
int
qemuTeardownRNGCgroup(virDomainObjPtr vm,
virDomainRNGDefPtr rng)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
int rv;
if (!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_DEVICES))
return 0;
if (rng->backend == VIR_DOMAIN_RNG_BACKEND_RANDOM) {
VIR_DEBUG("Tearing down Cgroup ACL for RNG device");
rv = virCgroupDenyDevicePath(priv->cgroup,
rng->source.file,
VIR_CGROUP_DEVICE_RW, false);
virDomainAuditCgroupPath(vm, priv->cgroup, "deny",
rng->source.file,
"rw", rv);
if (rv < 0 &&
!virLastErrorIsSystemErrno(ENOENT))
return -1;
}
return 0;
}
static int
CVE_2013_6456_libvirt1_1_0_lxcDomainDetachDeviceHostdevMiscLive(virDomainObjPtr vm,
virDomainDeviceDefPtr dev)
{
virLXCDomainObjPrivatePtr priv = vm->privateData;
virDomainHostdevDefPtr def = NULL;
int i, ret = -1;
char *dst = NULL;
if (!priv->initpid) {
virReportError(VIR_ERR_OPERATION_INVALID, "%s",
_("Cannot attach disk until init PID is known"));
goto cleanup;
}
if ((i = virDomainHostdevFind(vm->def,
dev->data.hostdev,
&def)) < 0) {
virReportError(VIR_ERR_OPERATION_FAILED,
_("hostdev %s not found"),
dev->data.hostdev->source.caps.u.misc.chardev);
goto cleanup;
}
if (virAsprintf(&dst, "/proc/%llu/root/%s",
(unsigned long long)priv->initpid,
def->source.caps.u.misc.chardev) < 0) {
virReportOOMError();
goto cleanup;
}
if (!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_DEVICES)) {
virReportError(VIR_ERR_OPERATION_INVALID, "%s",
_("devices cgroup isn't mounted"));
goto cleanup;
}
VIR_DEBUG("Unlinking %s", dst);
if (unlink(dst) < 0 && errno != ENOENT) {
virDomainAuditHostdev(vm, def, "detach", false);
virReportSystemError(errno,
_("Unable to remove device %s"), dst);
goto cleanup;
}
virDomainAuditHostdev(vm, def, "detach", true);
if (virCgroupDenyDevicePath(priv->cgroup, def->source.caps.u.misc.chardev, VIR_CGROUP_DEVICE_RWM) != 0)
VIR_WARN("cannot deny device %s for domain %s",
def->source.caps.u.misc.chardev, vm->def->name);
virDomainHostdevRemove(vm->def, i);
virDomainHostdevDefFree(def);
ret = 0;
cleanup:
VIR_FREE(dst);
return ret;
}
int
qemuTeardownHostdevCgroup(virDomainObjPtr vm,
virDomainHostdevDefPtr dev)
{
int ret = -1;
qemuDomainObjPrivatePtr priv = vm->privateData;
virDomainHostdevSubsysPCIPtr pcisrc = &dev->source.subsys.u.pci;
virPCIDevicePtr pci = NULL;
char *path = NULL;
/* currently this only does something for PCI devices using vfio
* for device assignment, but it is called for *all* hostdev
* devices.
*/
if (!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_DEVICES))
return 0;
if (dev->mode == VIR_DOMAIN_HOSTDEV_MODE_SUBSYS) {
switch (dev->source.subsys.type) {
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI:
if (pcisrc->backend == VIR_DOMAIN_HOSTDEV_PCI_BACKEND_VFIO) {
int rv;
pci = virPCIDeviceNew(pcisrc->addr.domain,
pcisrc->addr.bus,
pcisrc->addr.slot,
pcisrc->addr.function);
if (!pci)
goto cleanup;
if (!(path = virPCIDeviceGetIOMMUGroupDev(pci)))
goto cleanup;
VIR_DEBUG("Cgroup deny %s for PCI device assignment", path);
rv = virCgroupDenyDevicePath(priv->cgroup, path,
VIR_CGROUP_DEVICE_RWM);
virDomainAuditCgroupPath(vm, priv->cgroup,
"deny", path, "rwm", rv == 0);
if (rv < 0)
goto cleanup;
}
break;
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB:
/* nothing to tear down for USB */
break;
default:
break;
}
}
ret = 0;
cleanup:
virPCIDeviceFree(pci);
VIR_FREE(path);
return ret;
}
static int
qemuSetImageCgroupInternal(virDomainObjPtr vm,
virStorageSourcePtr src,
bool deny,
bool forceReadonly)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
int perms = VIR_CGROUP_DEVICE_READ;
int ret;
if (!virCgroupHasController(priv->cgroup,
VIR_CGROUP_CONTROLLER_DEVICES))
return 0;
if (!src->path || !virStorageSourceIsLocalStorage(src)) {
VIR_DEBUG("Not updating cgroups for disk path '%s', type: %s",
NULLSTR(src->path), virStorageTypeToString(src->type));
return 0;
}
if (deny) {
perms |= VIR_CGROUP_DEVICE_WRITE | VIR_CGROUP_DEVICE_MKNOD;
VIR_DEBUG("Deny path %s", src->path);
ret = virCgroupDenyDevicePath(priv->cgroup, src->path, perms);
} else {
if (!src->readonly && !forceReadonly)
perms |= VIR_CGROUP_DEVICE_WRITE;
VIR_DEBUG("Allow path %s, perms: %s",
src->path, virCgroupGetDevicePermsString(perms));
ret = virCgroupAllowDevicePath(priv->cgroup, src->path, perms);
}
virDomainAuditCgroupPath(vm, priv->cgroup,
deny ? "deny" : "allow",
src->path,
virCgroupGetDevicePermsString(perms),
ret == 0);
/* Get this for root squash NFS */
if (ret < 0 &&
virLastErrorIsSystemErrno(EACCES)) {
VIR_DEBUG("Ignoring EACCES for %s", src->path);
virResetLastError();
ret = 0;
}
return ret;
}
static int
qemuTeardownChrSourceCgroup(virDomainObjPtr vm,
virDomainChrSourceDefPtr source)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
int ret;
if (source->type != VIR_DOMAIN_CHR_TYPE_DEV)
return 0;
VIR_DEBUG("Process path '%s' for device", source->data.file.path);
ret = virCgroupDenyDevicePath(priv->cgroup, source->data.file.path,
VIR_CGROUP_DEVICE_RW, false);
virDomainAuditCgroupPath(vm, priv->cgroup, "deny",
source->data.file.path, "rw", ret == 0);
return ret;
}
int
qemuTeardownMemoryDevicesCgroup(virDomainObjPtr vm,
virDomainMemoryDefPtr mem)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
int rv;
if (mem->model != VIR_DOMAIN_MEMORY_MODEL_NVDIMM)
return 0;
if (!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_DEVICES))
return 0;
rv = virCgroupDenyDevicePath(priv->cgroup, mem->nvdimmPath,
VIR_CGROUP_DEVICE_RWM, false);
virDomainAuditCgroupPath(vm, priv->cgroup,
"deny", mem->nvdimmPath, "rwm", rv);
return rv;
}
int
qemuTeardownHostdevCgroup(virDomainObjPtr vm,
virDomainHostdevDefPtr dev)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
char **path = NULL;
size_t i, npaths = 0;
int rv, ret = -1;
/* currently this only does something for PCI devices using vfio
* for device assignment, but it is called for *all* hostdev
* devices.
*/
if (!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_DEVICES))
return 0;
if (dev->mode == VIR_DOMAIN_HOSTDEV_MODE_SUBSYS &&
dev->source.subsys.type == VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI &&
dev->source.subsys.u.pci.backend == VIR_DOMAIN_HOSTDEV_PCI_BACKEND_VFIO &&
qemuDomainGetHostdevPath(vm->def, dev, true,
&npaths, &path, NULL) < 0)
goto cleanup;
for (i = 0; i < npaths; i++) {
VIR_DEBUG("Cgroup deny %s", path[i]);
rv = virCgroupDenyDevicePath(priv->cgroup, path[i],
VIR_CGROUP_DEVICE_RWM, false);
virDomainAuditCgroupPath(vm, priv->cgroup,
"deny", path[i], "rwm", rv);
if (rv < 0)
goto cleanup;
}
ret = 0;
cleanup:
for (i = 0; i < npaths; i++)
VIR_FREE(path[i]);
VIR_FREE(path);
return ret;
}
int
qemuTeardownInputCgroup(virDomainObjPtr vm,
virDomainInputDefPtr dev)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
int ret = 0;
if (!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_DEVICES))
return 0;
switch (dev->type) {
case VIR_DOMAIN_INPUT_TYPE_PASSTHROUGH:
VIR_DEBUG("Process path '%s' for input device", dev->source.evdev);
ret = virCgroupDenyDevicePath(priv->cgroup, dev->source.evdev,
VIR_CGROUP_DEVICE_RWM, false);
virDomainAuditCgroupPath(vm, priv->cgroup, "deny", dev->source.evdev, "rwm", ret);
break;
}
return ret;
}
static int
qemuTeardownDiskPathDeny(virDomainDiskDefPtr disk ATTRIBUTE_UNUSED,
const char *path,
size_t depth ATTRIBUTE_UNUSED,
void *opaque)
{
virDomainObjPtr vm = opaque;
qemuDomainObjPrivatePtr priv = vm->privateData;
int ret;
VIR_DEBUG("Process path %s for disk", path);
ret = virCgroupDenyDevicePath(priv->cgroup, path,
VIR_CGROUP_DEVICE_RWM);
virDomainAuditCgroupPath(vm, priv->cgroup, "deny", path, "rwm", ret == 0);
/* Get this for root squash NFS */
if (ret < 0 &&
virLastErrorIsSystemErrno(EACCES)) {
VIR_DEBUG("Ignoring EACCES for %s", path);
virResetLastError();
ret = 0;
}
return ret;
}
