[NTOSKRNL]

Implement NtSaveMergedKeys and its backend CmSaveMergedKeys.

svn path=/trunk/; revision=66205

reactos/ntoskrnl/config/cmapi.c

@@ -2444,3 +2444,79 @@ Cleanup:
 
     return Status;
 }
+
+NTSTATUS
+NTAPI
+CmSaveMergedKeys(IN PCM_KEY_CONTROL_BLOCK HighKcb,
+                 IN PCM_KEY_CONTROL_BLOCK LowKcb,
+                 IN HANDLE FileHandle)
+{
+    PCMHIVE KeyHive = NULL;
+    NTSTATUS Status = STATUS_SUCCESS;
+
+    PAGED_CODE();
+
+    DPRINT("CmSaveKey(%p, %p, %p)\n", HighKcb, LowKcb, FileHandle);
+
+    /* Lock the registry and the KCBs */
+    CmpLockRegistry();
+    CmpAcquireKcbLockShared(HighKcb);
+    CmpAcquireKcbLockShared(LowKcb);
+
+    if (LowKcb->Delete || HighKcb->Delete)
+    {
+        /* The source key has been deleted, do nothing */
+        Status = STATUS_KEY_DELETED;
+        goto done;
+    }
+
+    /* Create a new hive that will hold the key */
+    Status = CmpInitializeHive(&KeyHive,
+                               HINIT_CREATE,
+                               HIVE_VOLATILE,
+                               HFILE_TYPE_PRIMARY,
+                               NULL,
+                               NULL,
+                               NULL,
+                               NULL,
+                               NULL,
+                               0);
+    if (!NT_SUCCESS(Status))
+        goto done;
+
+    /* Copy the low precedence key recursively into the new hive */
+    Status = CmpDeepCopyKey(LowKcb->KeyHive,
+                            LowKcb->KeyCell,
+                            &KeyHive->Hive,
+                            Stable,
+                            &KeyHive->Hive.BaseBlock->RootCell);
+    if (!NT_SUCCESS(Status))
+        goto done;
+
+    /* Copy the high precedence key recursively into the new hive */
+    Status = CmpDeepCopyKey(HighKcb->KeyHive,
+                            HighKcb->KeyCell,
+                            &KeyHive->Hive,
+                            Stable,
+                            &KeyHive->Hive.BaseBlock->RootCell);
+    if (!NT_SUCCESS(Status))
+        goto done;
+
+    /* Set the primary handle of the hive */
+    KeyHive->FileHandles[HFILE_TYPE_PRIMARY] = FileHandle;
+
+    /* Dump the hive into the file */
+    HvWriteHive(&KeyHive->Hive);
+
+done:
+    /* Free the hive */
+    if (KeyHive)
+        CmpDestroyHive(KeyHive);
+
+    /* Release the locks */
+    CmpReleaseKcbLock(LowKcb);
+    CmpReleaseKcbLock(HighKcb);
+    CmpUnlockRegistry();
+
+    return Status;
+}

reactos/ntoskrnl/config/ntapi.c

@@ -1258,7 +1258,7 @@ NtSaveKeyEx(IN HANDLE KeyHandle,
 
     PAGED_CODE();
 
-    DPRINT("NtSaveKeyEx(0x%08X, 0x%08X, %lu)\n", KeyHandle, FileHandle, Flags);
+    DPRINT("NtSaveKeyEx(0x%p, 0x%p, %lu)\n", KeyHandle, FileHandle, Flags);
 
     /* Verify the flags */
     if ((Flags != REG_STANDARD_FORMAT)
@@ -1297,8 +1297,56 @@ NtSaveMergedKeys(IN HANDLE HighPrecedenceKeyHandle,
                  IN HANDLE LowPrecedenceKeyHandle,
                  IN HANDLE FileHandle)
 {
-    UNIMPLEMENTED;
-    return STATUS_NOT_IMPLEMENTED;
+    KPROCESSOR_MODE PreviousMode;
+    PCM_KEY_BODY HighPrecedenceKeyObject = NULL;
+    PCM_KEY_BODY LowPrecedenceKeyObject = NULL;
+    NTSTATUS Status;
+
+    PAGED_CODE();
+
+    DPRINT("NtSaveMergedKeys(0x%p, 0x%p, 0x%p)\n",
+           HighPrecedenceKeyHandle, LowPrecedenceKeyHandle, FileHandle);
+
+    PreviousMode = ExGetPreviousMode();
+
+    /* Check for the SeBackupPrivilege */
+    if (!SeSinglePrivilegeCheck(SeBackupPrivilege, PreviousMode))
+    {
+        return STATUS_PRIVILEGE_NOT_HELD;
+    }
+
+    /* Verify that the handles are valid and are registry keys */
+    Status = ObReferenceObjectByHandle(HighPrecedenceKeyHandle,
+                                       KEY_READ,
+                                       CmpKeyObjectType,
+                                       PreviousMode,
+                                       (PVOID*)&HighPrecedenceKeyObject,
+                                       NULL);
+    if (!NT_SUCCESS(Status))
+        goto done;
+
+    Status = ObReferenceObjectByHandle(LowPrecedenceKeyHandle,
+                                       KEY_READ,
+                                       CmpKeyObjectType,
+                                       PreviousMode,
+                                       (PVOID*)&LowPrecedenceKeyObject,
+                                       NULL);
+    if (!NT_SUCCESS(Status))
+        goto done;
+
+    /* Call the internal API */
+    Status = CmSaveMergedKeys(HighPrecedenceKeyObject->KeyControlBlock,
+                              LowPrecedenceKeyObject->KeyControlBlock,
+                              FileHandle);
+
+done:
+    if (LowPrecedenceKeyObject)
+        ObDereferenceObject(LowPrecedenceKeyObject);
+
+    if (HighPrecedenceKeyObject)
+        ObDereferenceObject(HighPrecedenceKeyObject);
+
+    return Status;
 }
 
 NTSTATUS

reactos/ntoskrnl/include/internal/cm.h

@@ -1575,6 +1575,14 @@ CmSaveKey(
     IN ULONG Flags
 );
 
+NTSTATUS
+NTAPI
+CmSaveMergedKeys(
+    IN PCM_KEY_CONTROL_BLOCK HighKcb,
+    IN PCM_KEY_CONTROL_BLOCK LowKcb,
+    IN HANDLE FileHandle
+);
+
 //
 // Startup and Shutdown
 //