How can my 64-bit driver write to the 32-bit registry view?

NTDEV
1

In Win32 one can use the KEY_WOW64_32KEY access rights mask to make e.g. RegCreateKeyEx() operate on the 32-bit registry when running as a 64-bit process on windows 64-bit.

But how can I make my 64-bit driver do the same?

I?ve tried using ZwCreateKey() with the KEY_WOW64_32KEY mask, but it don?t work.

Regards
Tobias

2

xxxxx@diadrom.se wrote:

In Win32 one can use the KEY_WOW64_32KEY access rights mask to make e.g. RegCreateKeyEx() operate on the 32-bit registry when running as a 64-bit process on windows 64-bit.

Remember that’s it not really a separate registry. It’s just a subkey
within the existing registry.

But how can I make my 64-bit driver do the same?

I?ve tried using ZwCreateKey() with the KEY_WOW64_32KEY mask, but it don?t work.

Why not just specify the proper key? For example,
HKEY_LOCAL_MACHINE\Software\Wow6432Node.

–
Tim Roberts, xxxxx@probo.com
Providenza & Boekelheide, Inc.

3

Thanks for your answer.

If nothing else works I will use Wow6432Node. It?s just that MSDN says:
?Applications should not use the Wow6432Node key directly, as the implementation may change in future releases.?

Regards
Tobias

4

xxxxx@diadrom.se wrote:

Thanks for your answer.

If nothing else works I will use Wow6432Node. It’s just that MSDN says:
“Applications should not use the Wow6432Node key directly, as the implementation may change in future releases.”

A driver is not an application. A driver is expected to have a closer
relationship to the implementation than an application does.

–
Tim Roberts, xxxxx@probo.com
Providenza & Boekelheide, Inc.

5

>A driver is not an application. A driver is expected to have a closer

relationship to the implementation than an application does.

That is a good point.

Thank you for your guidance.

/Tobias

6

In user mode there is a flag bit that indicates the 32-bit registry should
be written. I have always assumed this is reflected in the kernel registry
calls. You might check out the flags field…and note that the
documentation may not have been fully updated.
joe

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of
xxxxx@diadrom.se
Sent: Thursday, December 16, 2010 5:04 AM
To: Windows System Software Devs Interest List
Subject: RE:[ntdev] How can my 64-bit driver write to the 32-bit registry
view?

Thanks for your answer.

If nothing else works I will use Wow6432Node. It?s just that MSDN says:
?Applications should not use the Wow6432Node key directly, as the
implementation may change in future releases.?

Regards
Tobias

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