Attention is currently required from: Hoernchen, jolly, laforge, lynxis lazus. dexter has posted comments on this change by laforge. ( https://gerrit.osmocom.org/c/osmo-ccid-firmware/+/42192?usp=email ) Change subject: ccid_device: Reject XfrBlock with zero-length data ...................................................................... Patch Set 1: (1 comment) Patchset: PS1:

Ah indeed, 4 bytes is only possible for an APDU but not a TPDU. See ETSI TS 102 221 Section 7.3.1.1. […] Yes, that is correct. I would assume that CCID sees only TPDUs, so if there is something below 5 bytes, it should be indeed rejected.

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