[reactos] 57/100: Fix physical memory section creation

[Jérôme Gardou]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=543112008aafc40b34fd68...

commit 543112008aafc40b34fd68b43baa04645aeaaaf1
Author:     Jérôme Gardou [e-mail]
AuthorDate: Fri Dec 18 16:53:39 2020 +0100
Commit:     Jérôme Gardou [e-mail]
CommitDate: Wed Feb 3 09:41:22 2021 +0100

Fix physical memory section creation
---
 ntoskrnl/mm/section.c | 34 ++++++++++++++++++++--------------
 1 file changed, 20 insertions(+), 14 deletions(-)

diff --git a/ntoskrnl/mm/section.c b/ntoskrnl/mm/section.c
index b709a50cd8d..b9242c6eade 100644
--- a/ntoskrnl/mm/section.c
+++ b/ntoskrnl/mm/section.c
@@ -2068,7 +2068,7 @@ MmCreatePhysicalMemorySection(VOID)
     /*
      * Create the section mapping physical memory
      */
-    SectionSize.QuadPart = MmNumberOfPhysicalPages * PAGE_SIZE;
+    SectionSize.QuadPart = MmHighestPhysicalPage * PAGE_SIZE;
     InitializeObjectAttributes(&Obj,
                                &Name,
                                OBJ_PERMANENT | OBJ_KERNEL_EXCLUSIVE,
@@ -2136,6 +2136,7 @@ MmCreatePhysicalMemorySection(VOID)
     if (!NT_SUCCESS(Status))
     {
         ObDereferenceObject(PhysSection);
+        return Status;
     }
     ObCloseHandle(Handle, KernelMode);

@@ -3654,16 +3655,17 @@ NtQuerySection(
             Sbi.BaseAddress = (PVOID)Section->Address.StartingVpn;

Sbi.Attributes = 0;
-            if (Section->u.Flags.Commit)
-                Sbi.Attributes |= SEC_COMMIT;
-            if (Section->u.Flags.Reserve)
-                Sbi.Attributes |= SEC_RESERVE;
             if (Section->u.Flags.File)
                 Sbi.Attributes |= SEC_FILE;
             if (Section->u.Flags.Image)
                 Sbi.Attributes |= SEC_IMAGE;

-            /* FIXME : Complete/test the list of flags passed back from NtCreateSection */
+            /* Those are not set *************
+            if (Section->u.Flags.Commit)
+                Sbi.Attributes |= SEC_COMMIT;
+            if (Section->u.Flags.Reserve)
+                Sbi.Attributes |= SEC_RESERVE;
+            **********************************/

if (Section->u.Flags.Image)
             {
@@ -4005,8 +4007,9 @@ MmMapViewOfSection(IN PVOID SectionObject,
         {
             (*ViewSize) = Section->SizeOfSection.QuadPart - ViewOffset;
         }
-        else if (((*ViewSize)+ViewOffset) > Section->SizeOfSection.QuadPart)
+        else if ((ExGetPreviousMode() == UserMode) && (((*ViewSize)+ViewOffset) > Section->SizeOfSection.QuadPart))
         {
+            /* Dubious */
             (*ViewSize) = MIN(Section->SizeOfSection.QuadPart - ViewOffset, SIZE_T_MAX - PAGE_SIZE);
         }

@@ -4329,8 +4332,16 @@ MmCreateSection (OUT PVOID  * Section,
             return STATUS_INVALID_PARAMETER_6;
         }

-        /* Did the caller pass a handle? */
-        if (FileHandle)
+        /* Did the caller pass a file object ? */
+        if (FileObject)
+        {
+            /* Reference the object directly */
+            ObReferenceObject(FileObject);
+
+            /* We don't create image mappings with file objects */
+            AllocationAttributes &= ~SEC_IMAGE;
+        }
+        else
         {
             /* Reference the file handle to get the object */
             Status = ObReferenceObjectByHandle(FileHandle,
@@ -4368,11 +4379,6 @@ MmCreateSection (OUT PVOID  * Section,
                 DPRINT1("Creating image map with writers open on the file!\n");
 #endif
         }
-        else
-        {
-            /* Reference the object directly */
-            ObReferenceObject(FileObject);
-        }
     }
     else
     {