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[NTOS:MM] Do not chunk-read files marked with FO_RANDOM_ACCESS

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This commit is contained in:
Jérôme Gardou 2021-02-16 11:27:19 +01:00
parent f04890c2af
commit 35c091adaf
1 changed files with 13 additions and 3 deletions
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16
ntoskrnl/mm/section.c
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@ -1200,9 +1200,19 @@ MmMakeSegmentResident(
if (!NT_SUCCESS(Status))
return Status;
RangeStart = Offset - (Offset % _64K);
if (RangeEnd % _64K)
RangeEnd += _64K - (RangeEnd % _64K);
/* If the file is not random access, read a 64K Chunk. */
if (!FlagOn(FileObject->Flags, FO_RANDOM_ACCESS))
{
RangeStart = Offset - (Offset % _64K);
if (RangeEnd % _64K)
RangeEnd += _64K - (RangeEnd % _64K);
}
else
{
RangeStart = Offset - (Offset % PAGE_SIZE);
if (RangeEnd % PAGE_SIZE)
RangeEnd += PAGE_SIZE - (RangeEnd % PAGE_SIZE);
}
/* Clamp if needed */
if (!FlagOn(*Segment->Flags, MM_DATAFILE_SEGMENT))