linux-kernel - Re: RFC: WMI Enhancements

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Date:   Mon, 8 May 2017 19:17:34 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Mario.Limonciello@...l.com
Cc:     dvhart@...radead.org, rjw@...ysocki.net, luto@...capital.net,
        len.brown@...el.com, corentin.chary@...il.com, luto@...nel.org,
        andriy.shevchenko@...ux.intel.com, linux-kernel@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: RFC: WMI Enhancements

On Friday 05 May 2017 23:55:46 Mario.Limonciello@...l.com wrote:
> Unfortunately the MOF data that comes out of wmi-mof is so called
> "Binary MOF" which has been pre-compiled to an intermediate format
> with mofcomp.exe on Windows. The format of binary MOF is not
> documented and the only known way to get text mof back out is by
> using mofcomp.exe with some esoteric arguments.
> 
> mofcomp.exe -MOF:recovered.mof -MFL:ms_409.mof -Amendment:MS_409
> binary_mof_file

Looks like that binary MOF file has "well-known" file extension .bmf. 
File itself starts with magic hader "FOMB" which is in reverse BMOF 
(binary mof). But I was not able to find any specification nor any other 
details. As this binary format is dated back to Win9x I guess data would 
compressed by some old MS compression algorithm (CAB?).

Moreover via tool wmiofck.exe it is possible to generate header file for 
WMI driver from binary mof file:

  wmiofck.exe -hfile.h -m -u file.bmf

And what is interesting that in this file are also comments which looks 
like comes from that binary mof file.

When I looked into output from mofcomp.exe with above args, that MOF 
output did not contain comments, so looks like we still can miss 
something.

See: http://blog.nietrzeba.pl/2011/12/mof-decompilation.html

-- 
Pali Rohár
pali.rohar@...il.com

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