Changeset 78628 in vbox for trunk/src/VBox/Additions/WINNT/SharedFolders/driver/vbsf.cpp

Timestamp:

May 21, 2019 11:32:08 AM (6 years ago)

Author:

vboxsync

Message:

winnt/vboxsf: Workaround for xpsp2 MmGetSystemRoutineAddress crash. bugref:9172

File:

• trunk/src/VBox/Additions/WINNT/SharedFolders/driver/vbsf.cpp (modified) (2 diffs)

trunk/src/VBox/Additions/WINNT/SharedFolders/driver/vbsf.cpp

@@ -22 +22 @@
 #include "vbsf.h"
 #include <iprt/initterm.h>
+#include <iprt/dbg.h>
 
 
@@ -662 +663 @@
     }
 
-    /* Resolve newer kernel APIs we might want to use: */
-    UNICODE_STRING RoutineName;
-    RtlInitUnicodeString(&RoutineName, L"CcCoherencyFlushAndPurgeCache");
-    g_pfnCcCoherencyFlushAndPurgeCache = (PFNCCCOHERENCYFLUSHANDPURGECACHE)MmGetSystemRoutineAddress(&RoutineName);
+    /*
+     * Resolve newer kernel APIs we might want to use.
+     * Note! Because of http://www.osronline.com/article.cfm%5eid=494.htm we cannot
+     *       use MmGetSystemRoutineAddress here as it will crash on xpsp2.
+     */
+    RTDBGKRNLINFO hKrnlInfo;
+    int rc = RTR0DbgKrnlInfoOpen(&hKrnlInfo, 0/*fFlags*/);
+    AssertLogRelRC(rc);
+    if (RT_SUCCESS(rc))
+    {
+        g_pfnCcCoherencyFlushAndPurgeCache
+            = (PFNCCCOHERENCYFLUSHANDPURGECACHE)RTR0DbgKrnlInfoGetSymbol(hKrnlInfo, NULL, "CcCoherencyFlushAndPurgeCache");
+        RTR0DbgKrnlInfoRelease(hKrnlInfo);
+    }
 
     /* Init the driver object. */