Major refactoring: WIP

src0/sys/misc.c

@@ -0,0 +1,109 @@
+/**
+ * @file sys/misc.c
+ *
+ * @copyright 2015 Bill Zissimopoulos
+ */
+
+#include <sys/driver.h>
+
+NTSTATUS FspCreateGuid(GUID *Guid);
+BOOLEAN FspValidRelativeSecurityDescriptor(
+    PSECURITY_DESCRIPTOR SecurityDescriptor, ULONG SecurityDescriptorLength,
+    SECURITY_INFORMATION RequiredInformation);
+NTSTATUS FspSecuritySubjectContextAccessCheck(
+    PSECURITY_DESCRIPTOR SecurityDescriptor, ACCESS_MASK DesiredAccess, KPROCESSOR_MODE AccessMode);
+VOID FspInitializeWorkItemWithDelay(FSP_WORK_ITEM_WITH_DELAY *WorkItem,
+    PWORKER_THREAD_ROUTINE Routine, PVOID Context);
+VOID FspQueueWorkItemWithDelay(FSP_WORK_ITEM_WITH_DELAY *WorkItem, LARGE_INTEGER Timeout);
+static KDEFERRED_ROUTINE FspQueueWorkItemWithDelayDPC;
+
+#ifdef ALLOC_PRAGMA
+#pragma alloc_text(PAGE, FspCreateGuid)
+#pragma alloc_text(PAGE, FspValidRelativeSecurityDescriptor)
+#pragma alloc_text(PAGE, FspSecuritySubjectContextAccessCheck)
+#pragma alloc_text(PAGE, FspInitializeWorkItemWithDelay)
+#pragma alloc_text(PAGE, FspQueueWorkItemWithDelay)
+#endif
+
+NTSTATUS FspCreateGuid(GUID *Guid)
+{
+    PAGED_CODE();
+
+    NTSTATUS Result;
+
+    int Retries = 3;
+    do
+    {
+        Result = ExUuidCreate(Guid);
+    } while (!NT_SUCCESS(Result) && 0 < --Retries);
+
+    return Result;
+}
+
+BOOLEAN FspValidRelativeSecurityDescriptor(
+    PSECURITY_DESCRIPTOR SecurityDescriptor, ULONG SecurityDescriptorLength,
+    SECURITY_INFORMATION RequiredInformation)
+{
+    PAGED_CODE();
+
+    BOOLEAN Result;
+
+    try
+    {
+        Result = RtlValidRelativeSecurityDescriptor(SecurityDescriptor, SecurityDescriptorLength,
+            RequiredInformation);
+    }
+    except (EXCEPTION_EXECUTE_HANDLER)
+    {
+        Result = FALSE;
+    }
+
+    return Result;
+}
+
+NTSTATUS FspSecuritySubjectContextAccessCheck(
+    PSECURITY_DESCRIPTOR SecurityDescriptor, ACCESS_MASK DesiredAccess, KPROCESSOR_MODE AccessMode)
+{
+    PAGED_CODE();
+
+    NTSTATUS Result = STATUS_ACCESS_DENIED;
+    SECURITY_SUBJECT_CONTEXT SecuritySubjectContext;
+    ACCESS_MASK GrantedAccess;
+
+    SeCaptureSubjectContext(&SecuritySubjectContext);
+    if (SeAccessCheck(SecurityDescriptor,
+        &SecuritySubjectContext, FALSE,
+        DesiredAccess, 0, 0, IoGetFileObjectGenericMapping(), AccessMode,
+        &GrantedAccess, &Result))
+        Result = STATUS_SUCCESS;
+    SeReleaseSubjectContext(&SecuritySubjectContext);
+
+    return Result;
+}
+
+VOID FspInitializeWorkItemWithDelay(FSP_WORK_ITEM_WITH_DELAY *WorkItem,
+    PWORKER_THREAD_ROUTINE Routine, PVOID Context)
+{
+    PAGED_CODE();
+
+    KeInitializeTimer(&WorkItem->Timer);
+    KeInitializeDpc(&WorkItem->Dpc, FspQueueWorkItemWithDelayDPC, WorkItem);
+    ExInitializeWorkItem(&WorkItem->WorkQueueItem, Routine, Context);
+}
+
+VOID FspQueueWorkItemWithDelay(FSP_WORK_ITEM_WITH_DELAY *WorkItem, LARGE_INTEGER Timeout)
+{
+    PAGED_CODE();
+
+    KeSetTimer(&WorkItem->Timer, Timeout, &WorkItem->Dpc);
+}
+
+static VOID FspQueueWorkItemWithDelayDPC(PKDPC Dpc,
+    PVOID DeferredContext, PVOID SystemArgument1, PVOID SystemArgument2)
+{
+    // !PAGED_CODE();
+
+    FSP_WORK_ITEM_WITH_DELAY *WorkItem = DeferredContext;
+
+    ExQueueWorkItem(&WorkItem->WorkQueueItem, DelayedWorkQueue);
+}