31 May
2011
31 May
'11
1:03 p.m.
Hi!
I'm one of the main authors of ReactOS' registry code in the kernel.
Although ReactOS uses a very compatible version of the Cm library which handles the
higher-order registry functionality, it uses a customized version of the Hive Library (Hv)
which is incompatible with the Windows one on many factors, including the one you
mentioned (as well as incorrectly sorting the keys -- you must not be relying on that
functionality).
A good GSoC project would've been for someone to rewrite the Hv code and/or fix it.
--
Best regards,
Alex Ionescu
On 2011-05-31, at 8:47 AM, Richard W.M. Jones wrote:
Hi, I'm one of the authors of hivex, a program for reading Windows
registry hive files:
http://libguestfs.org/hivex.3.html
The library can't currently read ReactOS hive files. I'm *very*
hestitant to say anyone is "wrong" here since the documentation for
hive files is obviously non-existent, but it appears that ReactOS
doesn't fill in the end_pages field in the header, and instead relies
on the size of the file itself.
For example, a hive downloaded from a fresh ReactOS install:
hivex_open: header fields:
file version 1.3
sequence nos 3 3
(sequences nos should match if hive was synched at shutdown)
original file name
(only 32 chars are stored, name is probably truncated)
root offset 0x70 + 0x1000
** end of last page 0x1000 + 0x1000 (total file size 0x22000)
checksum 0x8dc38fdf (calculated 0x8dc38fdf)
Notice that "end of last page" field is 0x1000, versus a completely
different file size.
hivex currently refuses to read past the end_pages limit, and we are
able to read every Windows hive that has ever been thrown at us.
If I hack hivex so that it ignores end_pages and simply uses the size
of the file as a guide, then hivex can successfully read the whole of
the file.
However I'm a bit unwilling to make this change to hivex just for
ReactOS, since it works fine with real Windows already.
So I wonder if this could just be a mistake in ReactOS or if there's
some deeper reason that I'm missing.
TIA,
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine. Supports Linux and Windows.
http://et.redhat.com/~rjones/virt-df/
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