At Wed, 2 May 2012 17:18:40 +0200 Hans Petter Selasky <hsela...@c2i.net> wrote:
> > On Wednesday 02 May 2012 07:03:59 Xiaofan Chen wrote: > > Reference: http://www.osronline.com/showthread.cfm?link=223812 > > > > In the above thread, Microsoft's Doron Holan (Windows driver > > expert) answered Microsoft's view on the perceived WinUSB > > limitations. > > > > I think this is of good reference to the list member here. > > > > Q1. WinUSB cannot be used to send an actual reset command to an USB device. > > A1: it is a privileged operation. Even if the user was an admin this > > can directly > > effect other stacks in a composite device". > > > > Q2: WinUSB cannot be used to set a device configuration that is > > different from the > > default one. > > A2: windows as a whole from a windows provided class driver pov only > > supports the > > default config > > > > Q3: WinUSB does not support multiple concurrent applications (as per the > > MSDN documenation). > > A3: correct. There is no way to know what is stateful and what is not. If > > you want concurrent app access, layer a umdf driver stack on winusb > > > > Q4: WinUSB does not support isochronous transfers. > > A4: yup. Neither does kmdf natively. The market for isoch support is > > extremely small, difficult to argue the cost benefit > > > > Q5: When using interface control requests (LIBUSB_RECIPIENT_INTERFACE), > > WinUSB overrides the low byte of wIndex with the destination interface. > > Ref: http://www.lvr.com/forum/index.php?topic=331 > > > > A5: this is so you only target your interface on a composite device. > > Letting a user mode stack manipulate a sibling interface is bad security > > and encapsulation, no? > > > > BTW, I have also posted this to libusb-win32 mailing list. > > Hi, > > Why Microsoft can't use the BSD or Linux USB stack then, which supports all > of > this. Sounds like very bad internal USB design to me! Can't use that pesky open source code -- it might cause a code leak or something. Or make MS-Windows too much like UNIX or even too POSIX compliant or something else equally bad. :-) > > --HPS > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > libusb-devel mailing list > libusb-de...@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/libusb-devel > > > -- Robert Heller -- 978-544-6933 / hel...@deepsoft.com Deepwoods Software -- http://www.deepsoft.com/ () ascii ribbon campaign -- against html e-mail /\ www.asciiribbon.org -- against proprietary attachments ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ libusbx-devel mailing list libusbx-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libusbx-devel
