[Pcsclite-muscle] Possible data truncation on receive in 1.8.14
Fri Nov 13 12:23:48 PST 2015
On Fri, 13 Nov 2015, Ludovic Rousseau wrote:
> 2015-11-13 15:35 GMT+01:00 Marcin Cieslak <saper at saper.info>:
> > This happens when passing data to CT API:
> > char CT_data(unsigned short ctn, /* Terminal Number */
> > unsigned char *dad, /* Destination */
> > unsigned char *sad, /* Source */
> > unsigned short lc, /* Length of command */
> > unsigned char *cmd, /* Command/Data Buffer */
> > unsigned short *lr, /* Length of Response */
> > unsigned char *rsp /* Response */
> > The supplied buffer length on my system, 65548 (hex 0x1000c) gets
> > downcast to (unsigned short), which is 12.
> > CT-API will not accept a buffer longer than 64KB. (No wonder given its
> > origins).
> Maybe you can fix CT-API API to use "unsigned int" for a buffer size
> instead of "unsigned short".
No, one can't. The CT-API specification says the length of response
is "IU16" - integer, unsigned, 16bit.
as far as I know most card readers produced or designed in Germany
use CT-API internally even if they expose PC/SC interface.
I seriously doubt such the readers accept larger buffer sizes.
8eb9ea1b354b050f997d003cf3b0c5b56f29f9f7 is strange because
requested buffer size given by the client application is no
longer used(!), only maximal value is used.
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