security, apparmor: add (Set|Restore)MemoryLabel

Recent changes have made implementing this mandatory to hot add any
memory.
Implementing this in apparmor fixes this as well as allows hot-add of nvdimm
tpye memory with an nvdimmPath set generating a AppArmor rule for that
path.

Example hot adding:
  <memory model='nvdimm'>
    <source>
      <path>/tmp/nvdimm-test</path>
    </source>
    <target>
      <size unit='KiB'>524288</size>
      <node>0</node>
    </target>
  </memory>
Creates now:
  "/tmp/nvdimm-test" rwk,

Fixes: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1755153Acked-by: NJamie Strandboge <jamie@canonical.com>
Signed-off-by: NChristian Ehrhardt <christian.ehrhardt@canonical.com>

src/security/security_apparmor.c

@@ -716,6 +716,49 @@ AppArmorRestoreSecurityDiskLabel(virSecurityManagerPtr mgr,
     return AppArmorRestoreSecurityImageLabel(mgr, def, disk->src);
 }
 
+/* Called when hotplugging */
+static int
+AppArmorSetMemoryLabel(virSecurityManagerPtr mgr,
+                       virDomainDefPtr def,
+                       virDomainMemoryDefPtr mem)
+{
+    if (mem == NULL)
+        return 0;
+
+    switch ((virDomainMemoryModel) mem->model) {
+    case VIR_DOMAIN_MEMORY_MODEL_NVDIMM:
+        if (mem->nvdimmPath == NULL) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("%s: nvdimm without a path"),
+                           __func__);
+            return -1;
+        }
+        if (!virFileExists(mem->nvdimmPath)) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("%s: \'%s\' does not exist"),
+                           __func__, mem->nvdimmPath);
+            return -1;
+        }
+        return reload_profile(mgr, def, mem->nvdimmPath, true);
+        break;
+    case VIR_DOMAIN_MEMORY_MODEL_NONE:
+    case VIR_DOMAIN_MEMORY_MODEL_DIMM:
+    case VIR_DOMAIN_MEMORY_MODEL_LAST:
+        break;
+    }
+
+    return 0;
+}
+
+
+static int
+AppArmorRestoreMemoryLabel(virSecurityManagerPtr mgr,
+                           virDomainDefPtr def,
+                           virDomainMemoryDefPtr mem ATTRIBUTE_UNUSED)
+{
+    return reload_profile(mgr, def, NULL, false);
+}
+
 /* Called when hotplugging */
 static int
 AppArmorSetSecurityImageLabel(virSecurityManagerPtr mgr,
@@ -1115,6 +1158,9 @@ virSecurityDriver virAppArmorSecurityDriver = {
     .domainSetSecurityImageLabel        = AppArmorSetSecurityImageLabel,
     .domainRestoreSecurityImageLabel    = AppArmorRestoreSecurityImageLabel,
 
+    .domainSetSecurityMemoryLabel       = AppArmorSetMemoryLabel,
+    .domainRestoreSecurityMemoryLabel   = AppArmorRestoreMemoryLabel,
+
     .domainSetSecurityDaemonSocketLabel = AppArmorSetSecurityDaemonSocketLabel,
     .domainSetSecuritySocketLabel       = AppArmorSetSecuritySocketLabel,
     .domainClearSecuritySocketLabel     = AppArmorClearSecuritySocketLabel,