https://git.reactos.org/?p=reactos.git;a=commitdiff;h=35c091adaf7ee70a57743f29ab288e3ca0881366
commit 35c091adaf7ee70a57743f29ab288e3ca0881366 Author: Jérôme Gardou <[email protected]> AuthorDate: Tue Feb 16 11:27:19 2021 +0100 Commit: Jérôme Gardou <[email protected]> CommitDate: Fri Feb 26 08:46:53 2021 +0100 [NTOS:MM] Do not chunk-read files marked with FO_RANDOM_ACCESS --- ntoskrnl/mm/section.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/ntoskrnl/mm/section.c b/ntoskrnl/mm/section.c index 3f364b49f4d..ea56635b72f 100644 --- a/ntoskrnl/mm/section.c +++ b/ntoskrnl/mm/section.c @@ -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))
