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[NTOS:IO] When a device has been started, create an Enum sub key to its service key and add the device instance name to the Enum sub key.

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This commit is contained in:
Eric Kohl 2018-12-25 23:04:27 +01:00
parent be84465883
commit 079f7027f6
1 changed files with 143 additions and 0 deletions
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143
ntoskrnl/io/pnpmgr/pnpmgr.c
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@ -646,6 +646,147 @@ IopSendStopDevice(IN PDEVICE_OBJECT DeviceObject)
IopSynchronousCall(DeviceObject, &Stack, &Dummy);
}
static
NTSTATUS
IopSetServiceEnumData(PDEVICE_NODE DeviceNode)
{
UNICODE_STRING ServicesKeyPath = RTL_CONSTANT_STRING(L"\\Registry\\Machine\\System\\CurrentControlSet\\Services\\");
UNICODE_STRING ServiceKeyName;
UNICODE_STRING EnumKeyName;
UNICODE_STRING ValueName;
PKEY_VALUE_FULL_INFORMATION KeyValueInformation;
HANDLE ServiceKey = NULL, ServiceEnumKey;
ULONG Disposition;
ULONG Count = 0, NextInstance = 0;
WCHAR ValueBuffer[6];
NTSTATUS Status = STATUS_SUCCESS;
DPRINT("IopSetServiceEnumData(%p)\n", DeviceNode);
DPRINT("Instance: %wZ\n", &DeviceNode->InstancePath);
DPRINT("Service: %wZ\n", &DeviceNode->ServiceName);
if (DeviceNode->ServiceName.Buffer == NULL)
{
DPRINT1("No service!\n");
return STATUS_SUCCESS;
}
ServiceKeyName.MaximumLength = ServicesKeyPath.Length + DeviceNode->ServiceName.Length + sizeof(UNICODE_NULL);
ServiceKeyName.Length = 0;
ServiceKeyName.Buffer = ExAllocatePool(PagedPool, ServiceKeyName.MaximumLength);
if (ServiceKeyName.Buffer == NULL)
{
DPRINT1("No ServiceKeyName.Buffer!\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlAppendUnicodeStringToString(&ServiceKeyName, &ServicesKeyPath);
RtlAppendUnicodeStringToString(&ServiceKeyName, &DeviceNode->ServiceName);
DPRINT("ServiceKeyName: %wZ\n", &ServiceKeyName);
Status = IopOpenRegistryKeyEx(&ServiceKey, NULL, &ServiceKeyName, KEY_CREATE_SUB_KEY);
if (!NT_SUCCESS(Status))
{
goto done;
}
RtlInitUnicodeString(&EnumKeyName, L"Enum");
Status = IopCreateRegistryKeyEx(&ServiceEnumKey,
ServiceKey,
&EnumKeyName,
KEY_SET_VALUE,
REG_OPTION_VOLATILE,
&Disposition);
if (NT_SUCCESS(Status))
{
if (Disposition == REG_OPENED_EXISTING_KEY)
{
/* Read the NextInstance value */
Status = IopGetRegistryValue(ServiceEnumKey,
L"Count",
&KeyValueInformation);
if (!NT_SUCCESS(Status))
goto done;
if ((KeyValueInformation->Type == REG_DWORD) &&
(KeyValueInformation->DataLength))
{
/* Read it */
Count = *(PULONG)((ULONG_PTR)KeyValueInformation +
KeyValueInformation->DataOffset);
}
ExFreePool(KeyValueInformation);
KeyValueInformation = NULL;
/* Read the NextInstance value */
Status = IopGetRegistryValue(ServiceEnumKey,
L"NextInstance",
&KeyValueInformation);
if (!NT_SUCCESS(Status))
goto done;
if ((KeyValueInformation->Type == REG_DWORD) &&
(KeyValueInformation->DataLength))
{
NextInstance = *(PULONG)((ULONG_PTR)KeyValueInformation +
KeyValueInformation->DataOffset);
}
ExFreePool(KeyValueInformation);
KeyValueInformation = NULL;
}
/* Set the instance path */
swprintf(ValueBuffer, L"%lu", NextInstance);
RtlInitUnicodeString(&ValueName, ValueBuffer);
Status = ZwSetValueKey(ServiceEnumKey,
&ValueName,
0,
REG_SZ,
DeviceNode->InstancePath.Buffer,
DeviceNode->InstancePath.MaximumLength);
if (!NT_SUCCESS(Status))
goto done;
/* Increment Count and NextInstance */
Count++;
NextInstance++;
/* Set the new Count value */
RtlInitUnicodeString(&ValueName, L"Count");
Status = ZwSetValueKey(ServiceEnumKey,
&ValueName,
0,
REG_DWORD,
&Count,
sizeof(Count));
if (!NT_SUCCESS(Status))
goto done;
/* Set the new NextInstance value */
RtlInitUnicodeString(&ValueName, L"NextInstance");
Status = ZwSetValueKey(ServiceEnumKey,
&ValueName,
0,
REG_DWORD,
&NextInstance,
sizeof(NextInstance));
}
done:
if (ServiceEnumKey != NULL)
ZwClose(ServiceEnumKey);
if (ServiceKey != NULL)
ZwClose(ServiceKey);
ExFreePool(ServiceKeyName.Buffer);
return Status;
}
VOID
NTAPI
IopStartDevice2(IN PDEVICE_OBJECT DeviceObject)
@ -739,6 +880,8 @@ IopStartAndEnumerateDevice(IN PDEVICE_NODE DeviceNode)
}
#endif
IopSetServiceEnumData(DeviceNode);
/* Make sure we're started, and check if we need enumeration */
if ((DeviceNode->Flags & DNF_STARTED) &&
(DeviceNode->Flags & DNF_NEED_ENUMERATION_ONLY))