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[NTOS:MM] Do not limit ourselves in reading or writing the file

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This commit is contained in:
Jérôme Gardou
2021-02-03 09:41:22 +01:00
parent c05f3d8d1c
commit 91edefa11e
1 changed files with 4 additions and 12 deletions
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ntoskrnl/mm/section.c
+4 -12
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@@ -214,16 +214,9 @@ MiWritePage(PMM_SECTION_SEGMENT Segment,
PMDL Mdl = (PMDL)MdlBase;
PFILE_OBJECT FileObject = Segment->FileObject;
LARGE_INTEGER FileOffset;
PFSRTL_COMMON_FCB_HEADER Fcb = FileObject->FsContext;
FileOffset.QuadPart = Segment->Image.FileOffset + SegOffset;
/* Check if we are not writing off-limit */
if (FileOffset.QuadPart >= Fcb->AllocationSize.QuadPart)
{
return STATUS_SUCCESS;
}
RtlZeroMemory(MdlBase, sizeof(MdlBase));
MmInitializeMdl(Mdl, NULL, PAGE_SIZE);
MmBuildMdlFromPages(Mdl, &Page);
@@ -1179,18 +1172,15 @@ MiReadPage(PMEMORY_AREA MemoryArea,
PMDL Mdl = (PMDL)MdlBase;
PFILE_OBJECT FileObject = MemoryArea->SectionData.Segment->FileObject;
LARGE_INTEGER FileOffset;
PFSRTL_COMMON_FCB_HEADER Fcb = FileObject->FsContext;
FileOffset.QuadPart = MemoryArea->SectionData.Segment->Image.FileOffset + SegOffset;
DPRINT("Reading file at offset %08x:%08x\n", FileOffset.HighPart, FileOffset.LowPart);
Status = MmRequestPageMemoryConsumer(MC_USER, FALSE, Page);
if (!NT_SUCCESS(Status))
return Status;
/* Check if we are beyond the file */
if (FileOffset.QuadPart > Fcb->FileSize.QuadPart)
return STATUS_SUCCESS;
RtlZeroMemory(MdlBase, sizeof(MdlBase));
MmInitializeMdl(Mdl, NULL, PAGE_SIZE);
MmBuildMdlFromPages(Mdl, Page);
@@ -1204,6 +1194,7 @@ MiReadPage(PMEMORY_AREA MemoryArea,
KeWaitForSingleObject(&Event, WrPageIn, KernelMode, FALSE, NULL);
Status = IoStatus.Status;
}
if (Mdl->MdlFlags & MDL_MAPPED_TO_SYSTEM_VA)
{
MmUnmapLockedPages (Mdl->MappedSystemVa, Mdl);
@@ -4539,6 +4530,7 @@ MmMakePagesResident(
MmUnlockAddressSpace(AddressSpace);
/* FIXME: Read the whole range at once instead of one page at a time */
/* Ignore file size, as Cc already checked on its side. */
Status = MiReadPage(MemoryArea, SegmentOffset.QuadPart, &Page);
if (!NT_SUCCESS(Status))
{