Re-label shared and readonly images

This patch was posted ages ago here:

  https://bugzilla.redhat.com/493692

But was never posted upstream AFAICT.

Patch from Dan Berrange
Signed-off-by: NMark McLoughlin <markmc@redhat.com>

ChangeLog

+Thu Jul  3 11:24:44 GMT 2009 Mark McLoughlin <markmc@redhat.com>
+
+	Patch from Dan Berrange in https://bugzilla.redhat.com/493692
+
+	* src/security_selinux.c: Re-label shared and readonly images
+	
 Thu Jul  2 15:58:09 CEST 2009 Daniel Veillard <veillard@redhat.com>
 
 	* docs/schemas/network.rng: fix the network schemas to match

src/security_selinux.c

@@ -24,11 +24,12 @@
 #include "virterror_internal.h"
 #include "util.h"
 #include "memory.h"
-
+#include "logging.h"
 
 #define VIR_FROM_THIS VIR_FROM_SECURITY
 
 static char default_domain_context[1024];
+static char default_content_context[1024];
 static char default_image_context[1024];
 #define SECURITY_SELINUX_VOID_DOI       "0"
 #define SECURITY_SELINUX_NAME "selinux"
@@ -148,8 +149,13 @@ SELinuxInitialize(virConnectPtr conn)
     close(fd);
 
     ptr = strchrnul(default_image_context, '\n');
-    *ptr = '\0';
-
+    if (*ptr == '\n') {
+        *ptr = '\0';
+        strcpy(default_content_context, ptr+1);
+        ptr = strchrnul(default_content_context, '\n');
+        if (*ptr == '\n')
+            *ptr = '\0';
+    }
     return 0;
 }
 
@@ -313,6 +319,8 @@ SELinuxSetFilecon(virConnectPtr conn, const char *path, char *tcon)
 {
     char ebuf[1024];
 
+    VIR_INFO("Setting SELinux context on '%s' to '%s'", path, tcon);
+
     if(setfilecon(path, tcon) < 0) {
         virSecurityReportError(conn, VIR_ERR_ERROR,
                                _("%s: unable to set security context "
@@ -337,9 +345,6 @@ SELinuxRestoreSecurityImageLabel(virConnectPtr conn,
     char *newpath = NULL;
     const char *path = disk->src;
 
-    if (disk->readonly || disk->shared)
-        return 0;
-
     if ((err = virFileResolveLink(path, &newpath)) < 0) {
         virReportSystemError(conn, err,
                              _("cannot resolve symlink %s"), path);
@@ -366,8 +371,13 @@ SELinuxSetSecurityImageLabel(virConnectPtr conn,
 {
     const virSecurityLabelDefPtr secdef = &vm->def->seclabel;
 
-    if (secdef->imagelabel)
+    if (disk->shared) {
+        return SELinuxSetFilecon(conn, disk->src, default_image_context);
+    } else if (disk->readonly) {
+        return SELinuxSetFilecon(conn, disk->src, default_content_context);
+    } else if (secdef->imagelabel) {
         return SELinuxSetFilecon(conn, disk->src, secdef->imagelabel);
+    }
 
     return 0;
 }
@@ -441,9 +451,6 @@ SELinuxSetSecurityLabel(virConnectPtr conn,
 
     if (secdef->imagelabel) {
         for (i = 0 ; i < vm->def->ndisks ; i++) {
-            if (vm->def->disks[i]->readonly ||
-                vm->def->disks[i]->shared) continue;
-
             if (SELinuxSetSecurityImageLabel(conn, vm, vm->def->disks[i]) < 0)
                 return -1;
         }