[vbox-dev] VirtualBox Load HGCM Host Service

Anirudh Bagde anidev.aelico at gmail.com
Thu Jun 17 18:28:59 PDT 2010


I finally figured out how to make it work. I had first built VBox OSE
without hardening, but I was getting an error "kernel driver not
accessible". Then I trid to build with hardening, but it didn't allow me to
use my own files and I didn't want to modify such an integral part of VBox.
I rebuilt it without hardening again. This time I tweaked some permissions
with /dev/vboxdrv and I reinstalled the package virtualbox-ose-dkms. My host
service is now loading successfully.

Thanks to Andreas for telling me how to load my service from within
ConsoleImpl2.cpp.

On Thu, Jun 17, 2010 at 8:07 PM, Anirudh Bagde <anidev.aelico at gmail.com>wrote:

> I managed to build from scratch VirtualBox OSE. It wasn't building before
> because some dev packages needed to be installed. I modified
> ConsoleImpl2.cpp to load my library and rebuilt VBoxC.so. However, in the
> log file, I get:
>
> 00:00:00.834 supR3HardenedLdrLoadIt: Verification of
> "/usr/src/virtualbox-ose-3.2.0-src/out/linux.x86/release/bin/VBoxBetterSeamless.so"
> failed, rc=VERR_NOT_FOUND
>
> I looked in the source files and I saw that my file apparently wasn't in a
> verification table (g_aSupInstallFiles) in file SUPR3HardenedVerify.cpp.
> Must my build of VBox OSE not be hardened before I can do this, or should I
> modify SUPR3HardenedVerify.cpp to include my library?
>
>
>
> On Tue, Jun 15, 2010 at 5:43 PM, Anirudh Bagde <anidev.aelico at gmail.com>wrote:
>
>> Thanks for your information. Does this mean I have to modify and rebuild
>> part of VirtualBox OSE?
>>
>> I didn't actually build it myself. I used aptitude to download and install
>> the package virtualbox-ose. So what should I do from here?
>>
>> Thanks again.
>>
>>
>> On Tue, Jun 15, 2010 at 3:11 AM, Andreas - Sun Microsystems <
>> pentagonik at sun.com> wrote:
>>
>>> Hi,
>>>
>>> you need to have Main load your service; take a look into
>>> src/VBox/Main/ConsoleImpl2.cpp, around
>>>
>>> .
>>> .
>>> .
>>> #ifdef VBOX_WITH_GUEST_PROPS
>>>    /*
>>>     * Guest property service
>>>     */
>>>
>>>    rc = configGuestProperties(pConsole);
>>> #endif /* VBOX_WITH_GUEST_PROPS defined */
>>> .
>>> .
>>>
>>>
>>> or
>>>
>>> .
>>> .
>>> .
>>> Console::configGuestProperties(void *pvConsole)
>>> .
>>> .
>>> .
>>>
>>> That's how we load the service for handling the guest properties.
>>>
>>> Hope this helps,
>>> -Andreas.
>>>
>>>
>>>
>>>
>>>  My host is Ubuntu Lucid with VirtualBox OSE and my guest is Windows XP
>>>> SP3 with VirtualBox (not ose).
>>>>
>>>> I want to create a set of programs that will make the VirtualBox
>>>> seamless mode work better. To do this, I had to learn how to use the
>>>> HGCM. I wrote a small test program for the guest side using C++ and
>>>> building it with Visual Studio C++ 2010 Express on Windows. It used
>>>> DeviceIoControl to connect and disconnect to the VBoxSharedClipboard
>>>> service. It seemed to work, i.e. info.result == VINF_SUCCESS. However,
>>>> info.u32ClientID == 0.
>>>>
>>>> I then decided to write the host service. I compiled a very small
>>>> library VBoxBetterSeamless.so that would just notify me if the
>>>> VBoxHGCMSvcLoad method was getting called. I verified that the method
>>>> was properly exported using readelf. I then put it in
>>>> /usr/lib/virtualbox/. VirtualBox OSE doesn't seem to call
>>>> VBoxHGCMSvcLoad when the XP VM starts, and I really don't know how to
>>>> make the service automatically load every time the VM starts. Google has
>>>> not been much help.
>>>>
>>>> What do I need to do to cause my service to load when the XP VM starts?
>>>>
>>>> Thanks in advance.
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> vbox-dev mailing list
>>>> vbox-dev at virtualbox.org
>>>> http://vbox.innotek.de/mailman/listinfo/vbox-dev
>>>>
>>>
>>>
>>> _______________________________________________
>>> vbox-dev mailing list
>>> vbox-dev at virtualbox.org
>>> http://vbox.innotek.de/mailman/listinfo/vbox-dev
>>>
>>
>>
>
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