[Pcsclite-muscle] Gemalto (was Gemplus) GemPC Key SmartCard Reader not working in debian stretch

[Wolfgang Pichler]

Hi,

i will try to collect this data.

An other thing i forgot to mention here - for me the bug only encountered on arm architecture (i have no idea why…) - the same lib versions on i386 / amd64 did worked.

I found the problem by adding some debug lines - to see where it does not get the correct answer. At this point i recongnised that the lib request to ready 65535 bytes from the usb stack - which seemed to be too much ;-). So i simply used a fixed value - which will be enough for my needs (signing a 256 bytes hash). But as said - this is just a workaround for me - no bug fix.

The only difference i found between the two sticks is - that the one which worked announced on more speed entry than the other stick. The rest ist identically.

Here is the original thread for reference:
http://lists.alioth.debian.org/pipermail/pcsclite-muscle/Week-of-Mon-20170220/000823.html <http://lists.alioth.debian.org/pipermail/pcsclite-muscle/Week-of-Mon-20170220/000823.html>

I forgot to answer - sorry.

The plattform is not a 2 byte int plattform.

The bug must be somewhere, where it does calculate the read size…

br,
Wolfgang

> Am 22.05.2017 um 11:05 schrieb Ludovic Rousseau <ludovic.rousseau at gmail.com>:
> 
> 2017-05-22 10:16 GMT+02:00 Wolfgang Pichler <wpichler at callino.at <mailto:wpichler at callino.at>>:
> Hi,
> 
> Hello,
>  
> i did had the same bug - it seems that some Gemalto Sticks (not all) have a problem in the firmware intitalize procedure. Because of this problem you get a too big usb read bytes request - which will then fail…
> 
> Very interesting.
> 
> Can you send me the output of the GNU/Linux command "lsusb -v" for your bogus device?
> And also the lines logged by the Linux kernel when you connect the device.
> 
> Same question with a non-bogus device if you have one.
> 
> How have you found the work around?
> Have you used a USB hardware spy or something similar?
> 
> I am surprised to see that changing the _reception_ buffer length has an effect. The USB device should not know this buffer size. But I am not a USB expert.
>  
> Attached a workaround for this problem - which does work for me.
> 
> But as stated - this is a workaround - not a real bug fix.
> 
> The workaround has a bad size effect that reader responses of more than 4096 bytes would have problems.
> Before I apply any workaround I need to understand why your change makes the reader work.
> 
> Bye
> 
> -- 
>  Dr. Ludovic Rousseau
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