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[NTOS/FSRTL] Implement FsRtlAcquireToCreateMappedSection using filter callbacks

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This commit is contained in:
Jérôme Gardou 2020-11-16 09:24:58 +01:00
parent 6929451500
commit bd0445dbf2
2 changed files with 61 additions and 1 deletions
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54
ntoskrnl/fsrtl/fastio.c
View file

@ -1561,15 +1561,55 @@ FsRtlAcquireFileExclusiveCommon(IN PFILE_OBJECT FileObject,
PFSRTL_COMMON_FCB_HEADER FcbHeader; PFSRTL_COMMON_FCB_HEADER FcbHeader;
PDEVICE_OBJECT DeviceObject; PDEVICE_OBJECT DeviceObject;
PFAST_IO_DISPATCH FastDispatch; PFAST_IO_DISPATCH FastDispatch;
PEXTENDED_DRIVER_EXTENSION DriverExtension;
PFS_FILTER_CALLBACKS FilterCallbacks;
/* Get Device Object and Fast Calls */ /* Get Device Object and Fast Calls */
FcbHeader = (PFSRTL_COMMON_FCB_HEADER)FileObject->FsContext; FcbHeader = (PFSRTL_COMMON_FCB_HEADER)FileObject->FsContext;
DeviceObject = IoGetRelatedDeviceObject(FileObject); DeviceObject = IoGetRelatedDeviceObject(FileObject);
FastDispatch = DeviceObject->DriverObject->FastIoDispatch;
/* Get master FsRtl lock */ /* Get master FsRtl lock */
FsRtlEnterFileSystem(); FsRtlEnterFileSystem();
DriverExtension = (PEXTENDED_DRIVER_EXTENSION)DeviceObject->DriverObject->DriverExtension;
FilterCallbacks = DriverExtension->FsFilterCallbacks;
/* Check if Filter Cllbacks are supported */
if (FilterCallbacks && FilterCallbacks->PreAcquireForSectionSynchronization)
{
NTSTATUS Status;
PVOID CompletionContext;
FS_FILTER_CALLBACK_DATA CbData;
RtlZeroMemory(&CbData, sizeof(CbData));
CbData.SizeOfFsFilterCallbackData = sizeof(CbData);
CbData.Operation = FS_FILTER_ACQUIRE_FOR_SECTION_SYNCHRONIZATION;
CbData.DeviceObject = DeviceObject;
CbData.FileObject = FileObject;
CbData.Parameters.AcquireForSectionSynchronization.PageProtection = Reserved;
CbData.Parameters.AcquireForSectionSynchronization.SyncType = SyncType;
Status = FilterCallbacks->PreAcquireForSectionSynchronization(&CbData, &CompletionContext);
if (!NT_SUCCESS(Status))
{
FsRtlExitFileSystem();
return Status;
}
/* Should we do something in-between ? */
if (FilterCallbacks->PostAcquireForSectionSynchronization)
{
FilterCallbacks->PostAcquireForSectionSynchronization(&CbData, Status, CompletionContext);
}
return Status;
}
FastDispatch = DeviceObject->DriverObject->FastIoDispatch;
/* Check if Fast Calls are supported, and check AcquireFileForNtCreateSection */ /* Check if Fast Calls are supported, and check AcquireFileForNtCreateSection */
if (FastDispatch && if (FastDispatch &&
FastDispatch->AcquireFileForNtCreateSection) FastDispatch->AcquireFileForNtCreateSection)
@ -1599,6 +1639,18 @@ FsRtlAcquireFileExclusive(IN PFILE_OBJECT FileObject)
(VOID)FsRtlAcquireFileExclusiveCommon(FileObject, SyncTypeOther, 0); (VOID)FsRtlAcquireFileExclusiveCommon(FileObject, SyncTypeOther, 0);
} }
/*
* @implemented
*/
NTSTATUS
NTAPI
FsRtlAcquireToCreateMappedSection(_In_ PFILE_OBJECT FileObject,
_In_ ULONG SectionPageProtection)
{
PAGED_CODE();
return FsRtlAcquireFileExclusiveCommon(FileObject, SyncTypeCreateSection, SectionPageProtection);
}
/* /*
* @implemented * @implemented
*/ */

8
ntoskrnl/include/internal/fsrtl.h
View file

@ -140,3 +140,11 @@ FsRtlInitSystem(
// //
extern PERESOURCE FsRtlPagingIoResources; extern PERESOURCE FsRtlPagingIoResources;
extern PAGED_LOOKASIDE_LIST FsRtlFileLockLookasideList; extern PAGED_LOOKASIDE_LIST FsRtlFileLockLookasideList;
//
// File locking routine
//
NTSTATUS
NTAPI
FsRtlAcquireToCreateMappedSection(_In_ PFILE_OBJECT FileObject,
_In_ ULONG SectionPageProtection);