[tfaber] 64690: [NTDLL:DBG] - Use NtReadVirtualMemory instead of dereferencing a pointer from a different process in DbgUiConvertStateChangeStructure. CORE-8622 #resolve

Author: tfaber
Date: Sun Oct 12 11:35:11 2014
New Revision: 64690

URL: http://svn.reactos.org/svn/reactos?rev=64690&view=rev
Log:
[NTDLL:DBG]
- Use NtReadVirtualMemory instead of dereferencing a pointer from a different process in
DbgUiConvertStateChangeStructure.
CORE-8622 #resolve

Modified:
    trunk/reactos/dll/ntdll/dbg/dbgui.c

Modified: trunk/reactos/dll/ntdll/dbg/dbgui.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/dll/ntdll/dbg/dbgui.c?rev=…
==============================================================================
--- trunk/reactos/dll/ntdll/dbg/dbgui.c	[iso-8859-1] (original)
+++ trunk/reactos/dll/ntdll/dbg/dbgui.c	[iso-8859-1] Sun Oct 12 11:35:11 2014
@@ -66,6 +66,9 @@
     THREAD_BASIC_INFORMATION ThreadBasicInfo;
     LPDEBUG_EVENT DebugEvent = Win32DebugEvent;
     HANDLE ThreadHandle;
+    HANDLE ProcessHandle;
+    PTEB Teb;
+    PVOID Pointer;
 
     /* Write common data */
     DebugEvent->dwProcessId = (DWORD)WaitStateChange->
@@ -256,13 +259,31 @@
                 NtClose(ThreadHandle);
             }
 
-            /* Check if we got thread information */
+            /* If we got thread information, open the process */
             if (NT_SUCCESS(Status))
             {
-                /* Save the image name from the TIB */
-                DebugEvent->u.LoadDll.lpImageName =
-                    ((PTEB)ThreadBasicInfo.TebBaseAddress)->
-                    NtTib.ArbitraryUserPointer;
+                Status = NtOpenProcess(&ProcessHandle,
+                                       PROCESS_VM_READ,
+                                       &ObjectAttributes,
+                                       &WaitStateChange->AppClientId);
+            }
+
+            if (NT_SUCCESS(Status))
+            {
+                /* Read the image name from the TIB */
+                Teb = ThreadBasicInfo.TebBaseAddress;
+                Status = NtReadVirtualMemory(ProcessHandle,
+                                             &Teb->NtTib.ArbitraryUserPointer,
+                                             &Pointer,
+                                             sizeof(Pointer),
+                                             NULL);
+                NtClose(ProcessHandle);
+            }
+
+            if (NT_SUCCESS(Status))
+            {
+                /* If everything was successful, set the image name */
+                DebugEvent->u.LoadDll.lpImageName = Pointer;
             }
             else
             {