[weiden] 20962: don't read the image file name from the Peb in NtQueryInformationProcess (class ProcessImageFileName), use the section object instead

don't read the image file name from the Peb in NtQueryInformationProcess
(class ProcessImageFileName), use the section object instead
Modified: trunk/reactos/ntoskrnl/ps/process.c
Modified: trunk/reactos/ntoskrnl/ps/query.c
  _____

Modified: trunk/reactos/ntoskrnl/ps/process.c
--- trunk/reactos/ntoskrnl/ps/process.c	2006-01-21 15:36:11 UTC (rev
20961)
+++ trunk/reactos/ntoskrnl/ps/process.c	2006-01-21 17:36:05 UTC (rev
20962)
@@ -320,6 +320,9 @@

Process->DebugPort = pDebugPort;
     Process->ExceptionPort = pExceptionPort;

+    /* Save the pointer to the section object */
+    Process->SectionObject = SectionObject;
+
     /* Setup the Lock Event */
     DPRINT("Initialzing Process Lock\n");
     KeInitializeEvent(&Process->LockEvent, SynchronizationEvent,
FALSE);
  _____

Modified: trunk/reactos/ntoskrnl/ps/query.c
--- trunk/reactos/ntoskrnl/ps/query.c	2006-01-21 15:36:11 UTC (rev
20961)
+++ trunk/reactos/ntoskrnl/ps/query.c	2006-01-21 17:36:05 UTC (rev
20962)
@@ -427,133 +427,53 @@

case ProcessImageFileName:
       {
-        /*
-         * We DO NOT return the file name stored in the EPROCESS
structure.
-         * Propably if we can't find a PEB or ProcessParameters
structure for the
-         * process!
-         */
-        if(Process->Peb != NULL)
-        {
-          PRTL_USER_PROCESS_PARAMETERS ProcParams = NULL;
-          UNICODE_STRING LocalDest;
-          BOOLEAN Attached;
           ULONG ImagePathLen = 0;
+          PSECTION_OBJECT Section;
           PUNICODE_STRING DstPath =
(PUNICODE_STRING)ProcessInformation;
+          PWSTR SrcBuffer = NULL, DstBuffer = (PWSTR)(DstPath + 1);

-          /* we need to attach to the process to make sure we're in the
right context! */
-          Attached = Process != PsGetCurrentProcess();
+          Section = (PSECTION_OBJECT)Process->SectionObject;

-          if(Attached)
-            KeAttachProcess(&Process->Pcb);
-
-          _SEH_TRY
+          if (Section != NULL && Section->FileObject != NULL)
           {
-            ProcParams = Process->Peb->ProcessParameters;
-            ImagePathLen = ProcParams->ImagePathName.Length;
+              /* FIXME - check for SEC_IMAGE and/or SEC_FILE instead
+                         of relying on FileObject being != NULL? */
+              SrcBuffer = Section->FileObject->FileName.Buffer;
+              if (SrcBuffer != NULL)
+              {
+                  ImagePathLen = Section->FileObject->FileName.Length;
+              }
           }
-          _SEH_HANDLE
-          {
-            Status = _SEH_GetExceptionCode();
-          }
-          _SEH_END;

-          if(NT_SUCCESS(Status))
+          if(ProcessInformationLength < sizeof(UNICODE_STRING) +
ImagePathLen + sizeof(WCHAR))
           {
-            if(ProcessInformationLength < sizeof(UNICODE_STRING) +
ImagePathLen + sizeof(WCHAR))
-            {
               Status = STATUS_INFO_LENGTH_MISMATCH;
-            }
-            else
-            {
-              PWSTR StrSource = NULL;
-
-              RtlZeroMemory(&LocalDest, sizeof(LocalDest));
-
-              /* create a DstPath structure on the stack */
+          }
+          else
+          {
               _SEH_TRY
               {
-                LocalDest.Length = ImagePathLen;
-                LocalDest.MaximumLength = ImagePathLen + sizeof(WCHAR);
-                LocalDest.Buffer = (PWSTR)(DstPath + 1);
-
-                /* save a copy of the pointer to the source buffer */
-                StrSource = ProcParams->ImagePathName.Buffer;
+                  /* copy the string manually, don't use
RtlCopyUnicodeString with DstPath! */
+                  DstPath->Length = ImagePathLen;
+                  DstPath->MaximumLength = ImagePathLen +
sizeof(WCHAR);
+                  DstPath->Buffer = DstBuffer;
+                  if (ImagePathLen != 0)
+                  {
+                      RtlCopyMemory(DstBuffer,
+                                    SrcBuffer,
+                                    ImagePathLen);
+                  }
+                  DstBuffer[ImagePathLen / sizeof(WCHAR)] = L'\0';
+                                
+                  Status = STATUS_SUCCESS;
               }
               _SEH_HANDLE
               {
-                Status = _SEH_GetExceptionCode();
+                  Status = _SEH_GetExceptionCode();
               }
               _SEH_END;
-
-              if(NT_SUCCESS(Status))
-              {
-                /* now, let's allocate some anonymous memory to copy
the string to.
-                   we can't just copy it to the buffer the caller
pointed as it might
-                   be user memory in another context */
-                PWSTR PathCopy = ExAllocatePool(PagedPool,
LocalDest.Length + sizeof(WCHAR));
-                if(PathCopy != NULL)
-                {
-                  /* make a copy of the buffer to the temporary buffer
*/
-                  _SEH_TRY
-                  {
-                    RtlCopyMemory(PathCopy, StrSource,
LocalDest.Length);
-                    PathCopy[LocalDest.Length / sizeof(WCHAR)] = L'\0';
-                  }
-                  _SEH_HANDLE
-                  {
-                    Status = _SEH_GetExceptionCode();
-                  }
-                  _SEH_END;
-
-                  /* detach from the process */
-                  if(Attached)
-                    KeDetachProcess();
-
-                  /* only copy the string back to the caller if we were
able to
-                     copy it into the temporary buffer! */
-                  if(NT_SUCCESS(Status))
-                  {
-                    /* now let's copy the buffer back to the caller */
-                    _SEH_TRY
-                    {
-                      *DstPath = LocalDest;
-                      RtlCopyMemory(LocalDest.Buffer, PathCopy,
LocalDest.Length + sizeof(WCHAR));
-                      if (ReturnLength)
-                      {
-                        *ReturnLength = sizeof(UNICODE_STRING) +
LocalDest.Length + sizeof(WCHAR);
-                      }
-                    }
-                    _SEH_HANDLE
-                    {
-                      Status = _SEH_GetExceptionCode();
-                    }
-                    _SEH_END;
-                  }
-
-                  /* we're done with the copy operation, free the
temporary kernel buffer */
-                  ExFreePool(PathCopy);
-
-                  /* we need to bail because we're already detached
from the process */
-                  break;
-                }
-                else
-                {
-                  Status = STATUS_INSUFFICIENT_RESOURCES;
-                }
-              }
-            }
           }
-
-          /* don't forget to detach from the process!!! */
-          if(Attached)
-            KeDetachProcess();
-        }
-        else
-        {
-          /* FIXME - what to do here? */
-          Status = STATUS_UNSUCCESSFUL;
-        }
-        break;
+          break;
       }

case ProcessCookie: