[reactos] 90/100: [NTOS:MM] Unconditionally purge cache on image section creation.

[Jérôme Gardou]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=ea354c4bc70cb7ee9302cf...

commit ea354c4bc70cb7ee9302cfdd6a2c780b29639af8
Author:     Jérôme Gardou [e-mail]
AuthorDate: Wed Jan 27 17:02:43 2021 +0100
Commit:     Jérôme Gardou [e-mail]
CommitDate: Wed Feb 3 09:41:23 2021 +0100

[NTOS:MM] Unconditionally purge cache on image section creation.
---
 ntoskrnl/mm/section.c | 60 ++++++---------------------------------------------
 1 file changed, 6 insertions(+), 54 deletions(-)

diff --git a/ntoskrnl/mm/section.c b/ntoskrnl/mm/section.c
index 8515820e116..ff7d9438baa 100644
--- a/ntoskrnl/mm/section.c
+++ b/ntoskrnl/mm/section.c
@@ -2470,20 +2470,6 @@ ExeFmtpAllocateSegments(IN ULONG NrSegments)

return Segments;
 }
-
-static NTSTATUS
-MmMapViewOfSegment(PMMSUPPORT AddressSpace,
-                   BOOLEAN AsImage,
-                   PMM_SECTION_SEGMENT Segment,
-                   PVOID* BaseAddress,
-                   SIZE_T ViewSize,
-                   ULONG Protect,
-                   LONGLONG ViewOffset,
-                   ULONG AllocationType);
-static NTSTATUS
-MmUnmapViewOfSegment(PMMSUPPORT AddressSpace,
-                     PVOID BaseAddress);
-
 static
 NTSTATUS
 NTAPI
@@ -2538,45 +2524,14 @@ ExeFmtpReadFile(IN PVOID File,
         return STATUS_INSUFFICIENT_RESOURCES;
     }

-    if (FileObject->SectionObjectPointer->DataSectionObject)
-    {
-        PVOID SegmentMap = NULL;
-
-        /* Get the data from the file mapping instead */
-        MmLockAddressSpace(MmGetKernelAddressSpace());
-        Status = MmMapViewOfSegment(MmGetKernelAddressSpace(),
-                                    FALSE,
-                                    FileObject->SectionObjectPointer->DataSectionObject,
-                                    &SegmentMap,
-                                    BufferSize,
-                                    PAGE_READONLY,
-                                    FileOffset.QuadPart,
-                                    0);
-        MmUnlockAddressSpace(MmGetKernelAddressSpace());
-
-        if (!NT_SUCCESS(Status))
-            return Status;
-
-        RtlCopyMemory(Buffer, SegmentMap, BufferSize);
-        UsedSize = BufferSize;
-
-        MmLockAddressSpace(MmGetKernelAddressSpace());
+    Status = MiSimpleRead(FileObject, &FileOffset, Buffer, BufferSize, TRUE, &Iosb);

-        MmUnmapViewOfSegment(MmGetKernelAddressSpace(), SegmentMap);
+    UsedSize = (ULONG)Iosb.Information;

-        MmUnlockAddressSpace(MmGetKernelAddressSpace());
-    }
-    else
+    if(NT_SUCCESS(Status) && UsedSize < OffsetAdjustment)
     {
-        Status = MiSimpleRead(FileObject, &FileOffset, Buffer, BufferSize, TRUE, &Iosb);
-
-        UsedSize = (ULONG)Iosb.Information;
-
-        if(NT_SUCCESS(Status) && UsedSize < OffsetAdjustment)
-        {
-            Status = STATUS_IN_PAGE_ERROR;
-            ASSERT(!NT_SUCCESS(Status));
-        }
+        Status = STATUS_IN_PAGE_ERROR;
+        ASSERT(!NT_SUCCESS(Status));
     }

if(NT_SUCCESS(Status))
@@ -3175,10 +3130,7 @@ MmCreateImageSection(PSECTION *SectionObject,
         MiReleasePfnLock(OldIrql);

/* Purge the cache */
-        if (CcIsFileCached(FileObject))
-        {
-            CcFlushCache(FileObject->SectionObjectPointer, NULL, 0, NULL);
-        }
+        CcFlushCache(FileObject->SectionObjectPointer, NULL, 0, NULL);

StatusExeFmt = ExeFmtpCreateImageSection(FileObject, ImageSectionObject);