[ros-dev] WIN32K: LPC use

[Alex Ionescu]

Emanuele Aliberti wrote:

> Alex Ionescu wrote:
>
>> That code was good enough to start with user mode subsystem servers, 
>> but till now it has prevented us from testing real system components 
>> like the SM, CSR and friends etc. for compatibility in ROS.
>> Unforunately, most of our LPC-dependent components are really broken 
>> because they depend on the not-so-correct LPC implementation.
>>
> It probably may be fixed easily by peeking up messages from the named 
> port's queue and not from the connected post's queue. That is the 
> major difference.
>
>> Also checking with some PDFs, some of our  checks are incorrect, and 
>> a lot of our stuff is just hard-coded. It took me a day to figure out 
>> where the max data/message sizes come from, but I think it was worth 
>> it, because that was just a small step in understanding the bigger 
>> picture.
>>
> Where do they come from? It is still a mistery for me!

    /* Allocate the LPC Lookaside List */
    LpcpMaxMessageSize = sizeof(LPCP_MESSAGE) +
                         sizeof(LPCP_CONNECTION_MESSAGE) + 
PORT_MAXIMUM_MESSAGE_LENGTH;


Where #define PORT_MAXIMUM_MESSAGE_LENGTH 256.

>
>> Anytime, just send it to my personal e-mail and we can collaborate.
>>
> Done.


I'm taking a look at it.

>
> About LPC flaws - This one is a good gallery by Razor:
> http://www.bindview.com/Support/RAZOR/Utilities/Windows/LPCAdvisory.cfm
>
> Emanuele

Best regards,
Alex Ionescu