[libvirt] [PATCH 06/12] security: selinux: Take parent security label into account

[Peter Krempa]

Until now we ignored user-provided backing chains and while detecting
the code inherited labels of the parent device. With user provided
chains we should keep this functionality, so label of the parent image
in the backing chain will be applied if an image-specific label is not
present.
---
 src/security/security_selinux.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/security/security_selinux.c b/src/security/security_selinux.c
index 66b3bbf1c..ed1828a12 100644
--- a/src/security/security_selinux.c
+++ b/src/security/security_selinux.c
@@ -1597,6 +1597,7 @@ virSecuritySELinuxSetImageLabelInternal(virSecurityManagerPtr mgr,
     virSecuritySELinuxDataPtr data = virSecurityManagerGetPrivateData(mgr);
     virSecurityLabelDefPtr secdef;
     virSecurityDeviceLabelDefPtr disk_seclabel;
+    virSecurityDeviceLabelDefPtr parent_seclabel = NULL;
     int ret;

     if (!src->path || !virStorageSourceIsLocalStorage(src))
@@ -1608,12 +1609,20 @@ virSecuritySELinuxSetImageLabelInternal(virSecurityManagerPtr mgr,

     disk_seclabel = virStorageSourceGetSecurityLabelDef(src,
                                                         SECURITY_SELINUX_NAME);
+    if (parent)
+        parent_seclabel = virStorageSourceGetSecurityLabelDef(parent,
+                                                              SECURITY_SELINUX_NAME);

-    if (disk_seclabel && !disk_seclabel->relabel)
-        return 0;
+    if (disk_seclabel && (!disk_seclabel->relabel || disk_seclabel->label)) {
+        if (!disk_seclabel->relabel)
+            return 0;

-    if (disk_seclabel && disk_seclabel->relabel && disk_seclabel->label) {
         ret = virSecuritySELinuxSetFilecon(mgr, src->path, disk_seclabel->label);
+    } else if (parent_seclabel && (!parent_seclabel->relabel || parent_seclabel->label)) {
+        if (!parent_seclabel->relabel)
+            return 0;
+
+        ret = virSecuritySELinuxSetFilecon(mgr, src->path, parent_seclabel->label);
     } else if (!parent || parent == src) {
         if (src->shared) {
             ret = virSecuritySELinuxSetFileconOptional(mgr,
-- 
2.14.1