diff --git a/reactos/lib/ntdll/def/ntdll.def b/reactos/lib/ntdll/def/ntdll.def
index e1d6af97011..5a1bd2a8778 100644
--- a/reactos/lib/ntdll/def/ntdll.def
+++ b/reactos/lib/ntdll/def/ntdll.def
@@ -586,7 +586,7 @@ RtlSecondsSince1970ToTime@8
 RtlSecondsSince1980ToTime@8
 RtlSelfRelativeToAbsoluteSD@44
 RtlSetAllBits@4
-;RtlSetAttributesSecurityDescriptor
+RtlSetAttributesSecurityDescriptor@12
 RtlSetBits@12
 RtlSetControlSecurityDescriptor@12
 RtlSetCriticalSectionSpinCount@8
diff --git a/reactos/lib/rtl/generictable.c b/reactos/lib/rtl/generictable.c
index 3ac6d804202..c38c416d077 100644
--- a/reactos/lib/rtl/generictable.c
+++ b/reactos/lib/rtl/generictable.c
@@ -28,6 +28,7 @@
 
 #define NDEBUG
 #include <debug.h>
+
 /* FUNCTIONS *****************************************************************/
 
 /*
@@ -177,22 +178,28 @@ RtlInitializeGenericTable (
 	UNIMPLEMENTED;
 }
 
+
 /*
-* @unimplemented
-*/
-VOID
-STDCALL
-RtlInitializeGenericTableAvl (
-	PRTL_AVL_TABLE Table,
-	PRTL_AVL_COMPARE_ROUTINE CompareRoutine,
-	PRTL_AVL_ALLOCATE_ROUTINE AllocateRoutine,
-	PRTL_AVL_FREE_ROUTINE FreeRoutine,
-	PVOID TableContext
-	)
+ * @implemented
+ */
+VOID STDCALL
+RtlInitializeGenericTableAvl(IN OUT PRTL_AVL_TABLE Table,
+                             IN PRTL_AVL_COMPARE_ROUTINE CompareRoutine,
+                             IN PRTL_AVL_ALLOCATE_ROUTINE AllocateRoutine,
+                             IN PRTL_AVL_FREE_ROUTINE FreeRoutine,
+                             IN PVOID TableContext)
 {
-	UNIMPLEMENTED;
+  RtlZeroMemory(Table,
+                sizeof(RTL_AVL_TABLE));
+  Table->BalancedRoot.Parent = &Table->BalancedRoot;
+
+  Table->CompareRoutine = CompareRoutine;
+  Table->AllocateRoutine = AllocateRoutine;
+  Table->FreeRoutine = FreeRoutine;
+  Table->TableContext = TableContext;
 }
 
+
 /*
 * @unimplemented
 */
@@ -351,29 +358,22 @@ RtlLookupElementGenericTableFullAvl (
 
 
 /*
-* @unimplemented
-*/
-ULONG
-STDCALL
-RtlNumberGenericTableElements(
-	PRTL_GENERIC_TABLE Table
-	)
+ * @implemented
+ */
+ULONG STDCALL
+RtlNumberGenericTableElements(IN PRTL_GENERIC_TABLE Table)
 {
-	UNIMPLEMENTED;
-	return 0;
+  return Table->NumberGenericTableElements;
 }
 
+
 /*
-* @unimplemented
-*/
-ULONG
-STDCALL
-RtlNumberGenericTableElementsAvl (
-	PRTL_AVL_TABLE Table
-	)
+ * @implemented
+ */
+ULONG STDCALL
+RtlNumberGenericTableElementsAvl(IN PRTL_AVL_TABLE Table)
 {
-	UNIMPLEMENTED;
-	return 0;
+  return Table->NumberGenericTableElements;
 }
 
 /* EOF */
diff --git a/reactos/lib/rtl/sd.c b/reactos/lib/rtl/sd.c
index a27f2e5e458..f8c60102d01 100644
--- a/reactos/lib/rtl/sd.c
+++ b/reactos/lib/rtl/sd.c
@@ -107,8 +107,8 @@ RtlpQuerySecurityDescriptor(PSECURITY_DESCRIPTOR SecurityDescriptor,
 }
 
 /*
-* @implemented
-*/
+ * @implemented
+ */
 NTSTATUS STDCALL
 RtlCreateSecurityDescriptor(PSECURITY_DESCRIPTOR SecurityDescriptor,
                             ULONG Revision)
@@ -814,4 +814,28 @@ RtlSetSecurityDescriptorRMControl(PSECURITY_DESCRIPTOR SecurityDescriptor,
   }
 }
 
+
+/*
+ * @implemented
+ */
+NTSTATUS STDCALL
+RtlSetAttributesSecurityDescriptor(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
+                                   IN SECURITY_DESCRIPTOR_CONTROL Control,
+                                   OUT PULONG Revision)
+{
+  *Revision = SecurityDescriptor->Revision;
+
+  if (SecurityDescriptor->Revision != SECURITY_DESCRIPTOR_REVISION1)
+    return STATUS_UNKNOWN_REVISION;
+
+  Control &=
+    ~(SE_OWNER_DEFAULTED | SE_GROUP_DEFAULTED | SE_DACL_PRESENT |
+      SE_DACL_DEFAULTED | SE_SACL_PRESENT | SE_SACL_DEFAULTED |
+      SE_RM_CONTROL_VALID | SE_SELF_RELATIVE);
+
+  return RtlSetControlSecurityDescriptor(SecurityDescriptor,
+                                         Control,
+                                         Control);
+}
+
 /* EOF */