https://git.reactos.org/?p=reactos.git;a=commitdiff;h=5bd938bd24598eeabf34163489f7050bbd68e768
commit 5bd938bd24598eeabf34163489f7050bbd68e768 Author: Pierre Schweitzer <[email protected]> AuthorDate: Thu Aug 16 11:58:58 2018 +0200 Commit: Pierre Schweitzer <[email protected]> CommitDate: Thu Aug 16 11:58:58 2018 +0200 [NTOSKRNL] Stub page file extension support --- ntoskrnl/mm/pagefile.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) diff --git a/ntoskrnl/mm/pagefile.c b/ntoskrnl/mm/pagefile.c index bbf3d94d3c..dba39b7653 100644 --- a/ntoskrnl/mm/pagefile.c +++ b/ntoskrnl/mm/pagefile.c @@ -571,9 +571,12 @@ NtCreatePagingFile(IN PUNICODE_STRING FileName, /* If we failed, relax a bit constraints, someone may be already holding the * the file, so share write, don't attempt to replace and don't delete on close * (basically, don't do anything conflicting) + * This can happen if the caller attempts to extend a page file. */ if (!NT_SUCCESS(Status)) { + ULONG i; + Status = IoCreateFile(&FileHandle, SYNCHRONIZE | FILE_WRITE_DATA, &ObjectAttributes, @@ -588,6 +591,67 @@ NtCreatePagingFile(IN PUNICODE_STRING FileName, CreateFileTypeNone, NULL, SL_OPEN_PAGING_FILE | IO_NO_PARAMETER_CHECKING); + if (!NT_SUCCESS(Status)) + { + ExFreePoolWithTag(Dacl, 'lcaD'); + ExFreePoolWithTag(Buffer, TAG_MM); + return Status; + } + + /* We opened it! Check we are that "someone" ;-) + * First, get the opened file object. + */ + Status = ObReferenceObjectByHandle(FileHandle, + FILE_READ_DATA | FILE_WRITE_DATA, + IoFileObjectType, + KernelMode, + (PVOID*)&FileObject, + NULL); + if (!NT_SUCCESS(Status)) + { + ZwClose(FileHandle); + ExFreePoolWithTag(Dacl, 'lcaD'); + ExFreePoolWithTag(Buffer, TAG_MM); + return Status; + } + + /* Find if it matches a previous page file */ + PagingFile = NULL; + if (MmNumberOfPagingFiles > 0) + { + i = 0; + + while (MmPagingFile[i]->FileObject->SectionObjectPointer != FileObject->SectionObjectPointer) + { + ++i; + if (i >= MmNumberOfPagingFiles) + { + break; + } + } + + /* This is the matching page file */ + PagingFile = MmPagingFile[i]; + } + + /* If we didn't find the page file, fail */ + if (PagingFile == NULL) + { + ObDereferenceObject(FileObject); + ZwClose(FileHandle); + ExFreePoolWithTag(Dacl, 'lcaD'); + ExFreePoolWithTag(Buffer, TAG_MM); + return STATUS_NOT_FOUND; + } + + /* FIXME: implement parameters checking and page file extension */ + UNIMPLEMENTED; + + ObDereferenceObject(FileObject); + ZwClose(FileHandle); + ExFreePoolWithTag(Dacl, 'lcaD'); + ExFreePoolWithTag(Buffer, TAG_MM); + return STATUS_NOT_IMPLEMENTED; } if (!NT_SUCCESS(Status))
