[ion] 55448: [NTOSKRNL]: Partly implement NtAreMappedFilesTheSame... [NTDLL]: Fix (although I'm not sure quite why) LdrpCheckForLoadedDll which was crashing now that I've fixed PAGE_EXECUTE section...

Author: ion
Date: Mon Feb  6 06:53:28 2012
New Revision: 55448

URL: http://svn.reactos.org/svn/reactos?rev=55448&view=rev
Log:
[NTOSKRNL]: Partly implement NtAreMappedFilesTheSame...
[NTDLL]: Fix (although I'm not sure quite why) LdrpCheckForLoadedDll which was crashing now that I've fixed PAGE_EXECUTE sections with only FILE_EXECUTE handles. Ironically, this meant that LdrpCheckForLoadedDll never worked until my previous fix some revisions ago, it always returned FALSE.
This should fix KVM/QEMU crashes...

Modified:
    trunk/reactos/dll/ntdll/ldr/ldrutils.c
    trunk/reactos/ntoskrnl/mm/ARM3/section.c

Modified: trunk/reactos/dll/ntdll/ldr/ldrutils.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/dll/ntdll/ldr/ldrutils.c?re...
==============================================================================
--- trunk/reactos/dll/ntdll/ldr/ldrutils.c [iso-8859-1] (original)
+++ trunk/reactos/dll/ntdll/ldr/ldrutils.c [iso-8859-1] Mon Feb  6 06:53:28 2012
@@ -2204,12 +2204,7 @@
                 {
                     /* Headers match too! Finally ask the kernel to compare mapped files */
                     Status = ZwAreMappedFilesTheSame(CurEntry->DllBase, ViewBase);
-                    if (!NT_SUCCESS(Status))
-                    {
-                        /* Almost identical, but not quite, keep trying */
-                        _SEH2_YIELD(continue;)
-                    }
-                    else
+                    if (NT_SUCCESS(Status))
                     {
                         /* This is our entry!, unmap and return success */
                         *LdrEntry = CurEntry;

Modified: trunk/reactos/ntoskrnl/mm/ARM3/section.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/ARM3/section.c?...
==============================================================================
--- trunk/reactos/ntoskrnl/mm/ARM3/section.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/ARM3/section.c [iso-8859-1] Mon Feb  6 06:53:28 2012
@@ -1383,8 +1383,88 @@
 NtAreMappedFilesTheSame(IN PVOID File1MappedAsAnImage,
                         IN PVOID File2MappedAsFile)
 {
-    UNIMPLEMENTED;
-    return STATUS_NOT_IMPLEMENTED;
+    PVOID AddressSpace;
+    PMEMORY_AREA MemoryArea1, MemoryArea2;
+    PROS_SECTION_OBJECT Section1, Section2;
+    
+    DPRINT1("Is image: %p the same as file: %p?\n", File1MappedAsAnImage, File2MappedAsFile);
+    
+    /* Lock address space */
+    AddressSpace = MmGetCurrentAddressSpace();
+    MmLockAddressSpace(AddressSpace);
+    
+    /* Locate the memory area for the process by address */
+    MemoryArea1 = MmLocateMemoryAreaByAddress(AddressSpace, File1MappedAsAnImage);
+    if (!MemoryArea1)
+    {
+        /* Fail, the address does not exist */
+        DPRINT1("Invalid address\n");
+        MmUnlockAddressSpace(AddressSpace);
+        return STATUS_INVALID_ADDRESS;
+    }
+    
+    /* Check if it's a section view (RosMm section) or ARM3 section */
+    if (MemoryArea1->Type != MEMORY_AREA_SECTION_VIEW)
+    {
+        /* Fail, the address is not a section */
+        DPRINT1("Invalid address (not a section)\n");
+        MmUnlockAddressSpace(AddressSpace);
+        return STATUS_CONFLICTING_ADDRESSES;
+    }
+    
+    /* Get the section pointer to the SECTION_OBJECT */
+    Section1 = MemoryArea1->Data.SectionData.Section;
+    if (Section1->FileObject == NULL)
+    {
+        DPRINT1("No file object\n");
+        MmUnlockAddressSpace(AddressSpace);
+        return STATUS_CONFLICTING_ADDRESSES; 
+    }
+    
+    /* Locate the memory area for the process by address */
+    MemoryArea2 = MmLocateMemoryAreaByAddress(AddressSpace, File2MappedAsFile);
+    if (!MemoryArea2)
+    {
+        /* Fail, the address does not exist */
+        DPRINT1("Invalid address\n");
+        MmUnlockAddressSpace(AddressSpace);
+        return STATUS_INVALID_ADDRESS;
+    }
+    
+    /* Check if it's a section view (RosMm section) or ARM3 section */
+    if (MemoryArea2->Type != MEMORY_AREA_SECTION_VIEW)
+    {
+        /* Fail, the address is not a section */
+        DPRINT1("Invalid address (not a section)\n");
+        MmUnlockAddressSpace(AddressSpace);
+        return STATUS_CONFLICTING_ADDRESSES;
+    }
+    
+    /* Get the section pointer to the SECTION_OBJECT */
+    Section2 = MemoryArea2->Data.SectionData.Section;
+    if (Section2->FileObject == NULL)
+    {
+        DPRINT1("No file object\n");
+        MmUnlockAddressSpace(AddressSpace);
+        return STATUS_CONFLICTING_ADDRESSES; 
+    }
+    
+    /* These dbgprints should allow me to see what should w ecompare in ROS's section implementation once the winetests are run... for now lie and say they're not equal. */
+    DPRINT1("FO1/2: %p %p\n", Section1->FileObject, Section2->FileObject);
+    DPRINT1("SOP: %p %p\n",
+            Section1->FileObject->SectionObjectPointer,
+            Section2->FileObject->SectionObjectPointer);
+    DPRINT1("SCM: %p %p\n",
+            Section1->FileObject->SectionObjectPointer->SharedCacheMap,
+            Section2->FileObject->SectionObjectPointer->SharedCacheMap);
+    DPRINT1("ISO: %p %p\n",
+            Section1->FileObject->SectionObjectPointer->ImageSectionObject,
+            Section2->FileObject->SectionObjectPointer->ImageSectionObject);
+    DPRINT1("SISO: %p %p\n", Section1->ImageSection, Section2->ImageSection);
+    
+    /* Unlock address space */
+    MmUnlockAddressSpace(AddressSpace);
+    return STATUS_NOT_SAME_DEVICE;
 }

/*