Add osmo_apdu_segment_in2() to ensure correct parsing of GP GET DATA

osmo_apdu_segment_in() doesn't have the context of the previous APDU,
for nearly all calls this is fine, except for GP GET DATA, which can be
a case 2 or case 4 APDU.
GP GET DATA defines the Le field as 0x00 which is used by osmo_apdu_segment_in
to detect if it is a case 2 or case 4.
However a card can respond with the SW 6cXX, which means the previous
command must be resend with a Le field XX, which got misinterpreted by
the osmo_apdu_segment_in() as a case 4 resulting in a timeout waiting for
more data.

Modem <-> Card
81cadf2000 ->
 <- 6c0b
81cadf200b ->
 -- Simtrace waits for more data because it wrongly decodes it as APDU case 4
    instead of case 2.

Related: SYS#8147
Change-Id: Ie238662e7e6a10dd4283ede0c8d8d73bc375c247
This commit is contained in:
Alexander Couzens authored and lynxis lazus committed 2026-08-18 15:31:43 +00:00
1 parent 9f85d1e15b
commit 63a61bfdaf
10 files changed
+197 -1

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@@ -45,3 +45,6 @@ const char *osmo_apdu_dump_context_buf(char *buf, unsigned int buf_len,
int osmo_apdu_segment_in(struct osmo_apdu_context *ac, const uint8_t *apdu_buf,
unsigned int apdu_len, bool new_apdu);
int osmo_apdu_segment_in2(struct osmo_apdu_context *ac, struct osmo_apdu_context *prev_ac,
const uint8_t *apdu_buf, unsigned int apdu_len, bool new_apdu);