[tkreuzer] 66525: [NTOSKRNL] Add some _SEH2_VOLATILE and a comment about memory barriers

Author: tkreuzer
Date: Sun Mar  1 16:33:43 2015
New Revision: 66525

URL: http://svn.reactos.org/svn/reactos?rev=66525&view=rev
Log:
[NTOSKRNL]
Add some _SEH2_VOLATILE and a comment about memory barriers

Modified:
    trunk/reactos/ntoskrnl/fsrtl/notify.c
    trunk/reactos/ntoskrnl/ob/oblife.c

Modified: trunk/reactos/ntoskrnl/fsrtl/notify.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/fsrtl/notify.c?rev...
==============================================================================
--- trunk/reactos/ntoskrnl/fsrtl/notify.c	[iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/fsrtl/notify.c	[iso-8859-1] Sun Mar  1 16:33:43 2015
@@ -85,7 +85,7 @@
     PIO_STACK_LOCATION Stack;
     PNOTIFY_CHANGE NotifyChange;
     PREAL_NOTIFY_SYNC RealNotifySync;
-    PSECURITY_SUBJECT_CONTEXT SubjectContext = NULL;
+    PSECURITY_SUBJECT_CONTEXT _SEH2_VOLATILE SubjectContext = NULL;

/* Get the NOTIFY_CHANGE struct and reset it */
     NotifyChange = (PNOTIFY_CHANGE)Irp->IoStatus.Information;
@@ -559,7 +559,7 @@
  * @implemented
  *
  * Lets FSD know if changes occures in the specified directory.
- * Directory will be reenumerated. 
+ * Directory will be reenumerated.
  *
  * @param NotifySync
  *        Synchronization object pointer
@@ -568,7 +568,7 @@
  *        Used to identify the notify structure
  *
  * @param FullDirectoryName
- *        String (A or W) containing the full directory name 
+ *        String (A or W) containing the full directory name
  *
  * @param NotifyList
  *        Notify list pointer (to head)
@@ -620,7 +620,7 @@
  *        Synchronization object pointer
  *
  * @param NotifyList
- *        Notify list pointer (to head) 
+ *        Notify list pointer (to head)
  *
  * @param FsContext
  *        Used to identify the notify structure
@@ -638,7 +638,7 @@
 {
     PNOTIFY_CHANGE NotifyChange;
     PREAL_NOTIFY_SYNC RealNotifySync;
-    PSECURITY_SUBJECT_CONTEXT SubjectContext = NULL;
+    PSECURITY_SUBJECT_CONTEXT _SEH2_VOLATILE SubjectContext = NULL;

/* Get real structure hidden behind the opaque pointer */
     RealNotifySync = (PREAL_NOTIFY_SYNC)NotifySync;
@@ -1337,7 +1337,7 @@
                             {
                                 if (PoolQuotaCharged)
                                 {
-                                    PsReturnProcessPagedPoolQuota(NotifyChange->OwningProcess, NumberOfBytes); 
+                                    PsReturnProcessPagedPoolQuota(NotifyChange->OwningProcess, NumberOfBytes);
                                 }
                                 NotifyChange->Flags |= NOTIFY_IMMEDIATELY;
                             }
@@ -1413,19 +1413,19 @@
  * @name FsRtlNotifyFullChangeDirectory
  * @implemented
  *
- * Lets FSD know if changes occures in the specified directory. 
+ * Lets FSD know if changes occures in the specified directory.
  *
  * @param NotifySync
  *        Synchronization object pointer
  *
  * @param NotifyList
- *        Notify list pointer (to head) 
+ *        Notify list pointer (to head)
  *
  * @param FsContext
  *        Used to identify the notify structure
  *
  * @param FullDirectoryName
- *        String (A or W) containing the full directory name 
+ *        String (A or W) containing the full directory name
  *
  * @param WatchTree
  *        True to notify changes in subdirectories too
@@ -1489,13 +1489,13 @@
  *        Synchronization object pointer
  *
  * @param NotifyList
- *        Notify list pointer (to head) 
+ *        Notify list pointer (to head)
  *
  * @param FullTargetName
  *        String (A or W) containing the full directory name that changed
  *
  * @param TargetNameOffset
- *        Offset, in FullTargetName, of the final component that is in the changed directory 
+ *        Offset, in FullTargetName, of the final component that is in the changed directory
  *
  * @param StreamName
  *        String (A or W) containing a stream name
@@ -1563,7 +1563,7 @@
     PREAL_NOTIFY_SYNC RealNotifySync;

*NotifySync = NULL;
-    
+
     RealNotifySync = ExAllocatePoolWithTag(NonPagedPool | POOL_RAISE_IF_ALLOCATION_FAILURE,
                                            sizeof(REAL_NOTIFY_SYNC), 'FSNS');
     ExInitializeFastMutex(&(RealNotifySync->FastMutex));
@@ -1583,7 +1583,7 @@
  *        Synchronization object pointer
  *
  * @param NotifyList
- *        Notify list pointer (to head) 
+ *        Notify list pointer (to head)
  *
  * @param FullTargetName
  *        String (A or W) containing the full directory name that changed
@@ -1616,7 +1616,7 @@
                                     FilterMatch,
                                     0,
                                     NULL,
-                                    NULL); 
+                                    NULL);
 }

/*++

Modified: trunk/reactos/ntoskrnl/ob/oblife.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ob/oblife.c?rev=66...
==============================================================================
--- trunk/reactos/ntoskrnl/ob/oblife.c	[iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/ob/oblife.c	[iso-8859-1] Sun Mar  1 16:33:43 2015
@@ -370,7 +370,7 @@
 {
     NTSTATUS Status = STATUS_SUCCESS;
     ULONG StringLength;
-    PWCHAR StringBuffer = NULL;
+    PWCHAR _SEH2_VOLATILE StringBuffer = NULL;
     UNICODE_STRING LocalName;
     PAGED_CODE();

@@ -491,7 +491,8 @@
             /* Check if we have a security descriptor */
             if (SecurityDescriptor)
             {
-                /* Capture it */
+                /* Capture it. Note: This has an implicit memory barrier due
+                   to the function call, so cleanup is safe here.) */
                 Status = SeCaptureSecurityDescriptor(SecurityDescriptor,
                                                      AccessMode,
                                                      NonPagedPool,