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[NTOSKRNL] Implement IoChangeFileObjectFilterContext()

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Pierre Schweitzer 2018-10-04 19:30:11 +02:00
parent a43fb5e054
commit 5f0d02eb52
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1 changed files with 29 additions and 2 deletions
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31
ntoskrnl/io/iomgr/file.c
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@ -2458,14 +2458,41 @@ IoChangeFileObjectFilterContext(IN PFILE_OBJECT FileObject,
IN PVOID FilterContext,
IN BOOLEAN Define)
{
ULONG_PTR Success;
PFILE_OBJECT_EXTENSION FileObjectExtension;
if (!(FileObject->Flags & FO_FILE_OBJECT_HAS_EXTENSION))
{
return STATUS_INVALID_PARAMETER;
}
UNIMPLEMENTED;
FileObjectExtension = FileObject->FileObjectExtension;
if (Define)
{
/* If define, just set the new value if not value is set
* Success will only contain old value. It is valid if it is NULL
*/
Success = InterlockedCompareExchange((volatile LONG *)&FileObjectExtension->FilterContext, (ULONG_PTR)FilterContext, 0);
}
else
{
/* If not define, we want to reset filter context.
* We will remove value (provided by the caller) and set NULL instead.
* This will only success if caller provides correct previous value.
* To catch whether it worked, we substract previous value to expect value:
* If it matches (and thus, we reset), Success will contain 0
* Otherwise, it will contain a non-zero value.
*/
Success = InterlockedCompareExchange((volatile LONG *)&FileObjectExtension->FilterContext, 0, (ULONG_PTR)FilterContext) - (ULONG_PTR)FilterContext;
}
return STATUS_NOT_IMPLEMENTED;
/* If success isn't 0, it means we failed somewhere (set or unset) */
if (Success != 0)
{
return STATUS_ALREADY_COMMITTED;
}
return STATUS_SUCCESS;
}
NTSTATUS