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sys,dll: reparse point testing

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This commit is contained in:
Bill Zissimopoulos
2016-09-10 23:00:55 -07:00
parent 0d25e73364
commit af2cc10c15
8 changed files with 171 additions and 112 deletions
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52
src/sys/util.c
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@ -20,6 +20,8 @@
BOOLEAN FspUnicodePathIsValid(PUNICODE_STRING Path, BOOLEAN AllowStreams);
VOID FspUnicodePathSuffix(PUNICODE_STRING Path, PUNICODE_STRING Remain, PUNICODE_STRING Suffix);
NTSTATUS FspCreateGuid(GUID *Guid);
NTSTATUS FspGetDeviceObjectByName(PUNICODE_STRING ObjectName, ACCESS_MASK DesiredAccess,
PULONG PFileNameIndex, PDEVICE_OBJECT *PDeviceObject);
NTSTATUS FspSendSetInformationIrp(PDEVICE_OBJECT DeviceObject, PFILE_OBJECT FileObject,
FILE_INFORMATION_CLASS FileInformationClass, PVOID FileInformation, ULONG Length);
static NTSTATUS FspSendSetInformationIrpCompletion(
@ -88,6 +90,7 @@ NTSTATUS FspIrpHookNext(PDEVICE_OBJECT DeviceObject, PIRP Irp, PVOID Context);
#pragma alloc_text(PAGE, FspUnicodePathIsValid)
#pragma alloc_text(PAGE, FspUnicodePathSuffix)
#pragma alloc_text(PAGE, FspCreateGuid)
#pragma alloc_text(PAGE, FspGetDeviceObjectByName)
#pragma alloc_text(PAGE, FspSendSetInformationIrp)
#pragma alloc_text(PAGE, FspBufferUserBuffer)
#pragma alloc_text(PAGE, FspLockUserBuffer)
@ -243,6 +246,55 @@ NTSTATUS FspCreateGuid(GUID *Guid)
return Result;
}
NTSTATUS FspGetDeviceObjectByName(PUNICODE_STRING ObjectName, ACCESS_MASK DesiredAccess,
PULONG PFileNameIndex, PDEVICE_OBJECT *PDeviceObject)
{
UNICODE_STRING PartialName;
PFILE_OBJECT FileObject;
OBJECT_ATTRIBUTES ObjectAttributes;
HANDLE Handle;
NTSTATUS Result;
PartialName.Length = 0;
PartialName.MaximumLength = ObjectName->Length;
PartialName.Buffer = ObjectName->Buffer;
Result = STATUS_NO_SUCH_DEVICE;
while (PartialName.MaximumLength > PartialName.Length)
{
while (PartialName.MaximumLength > PartialName.Length &&
L'\\' == PartialName.Buffer[PartialName.Length / sizeof(WCHAR)])
PartialName.Length += sizeof(WCHAR);
while (PartialName.MaximumLength > PartialName.Length &&
L'\\' != PartialName.Buffer[PartialName.Length / sizeof(WCHAR)])
PartialName.Length += sizeof(WCHAR);
Result = IoGetDeviceObjectPointer(&PartialName, DesiredAccess, &FileObject, PDeviceObject);
if (NT_SUCCESS(Result))
{
*PFileNameIndex = PartialName.Length;
ObReferenceObject(*PDeviceObject);
ObDereferenceObject(FileObject);
break;
}
InitializeObjectAttributes(&ObjectAttributes, &PartialName, OBJ_KERNEL_HANDLE, 0, 0);
Result = ZwOpenDirectoryObject(&Handle, 0, &ObjectAttributes);
if (!NT_SUCCESS(Result))
{
Result = ZwOpenSymbolicLinkObject(&Handle, 0, &ObjectAttributes);
if (!NT_SUCCESS(Result))
{
Result = STATUS_NO_SUCH_DEVICE;
break;
}
}
ZwClose(Handle);
}
return Result;
}
typedef struct
{
IO_STATUS_BLOCK IoStatus;