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iucvterm: Improve receiving of IUCV terminal messages

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If iucvtty_read_data() receives message data and reads less than
MSG_DATA_OFFSET, out-of-bound reads will happen.

Correct and improve the receiving path by always reading the entire
message header. Also improve the "residual" message data handling by
replacing and processing every message now as chunk.

Acked-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Hendrik Brueckner
2026-07-06 12:03:42 +02:00
committed by Jan Höppner
parent a69a46eafd
commit b1e3ee255f
2 changed files with 118 additions and 56 deletions
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iucvterm/include/iucvterm/functions.h
+1 -1
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@@ -55,7 +55,7 @@ extern int iucvtty_read_data(int, struct iucvtty_msg *, size_t);
extern int iucvtty_read_msg(int, struct iucvtty_msg *, size_t, size_t *);
extern int iucvtty_write_msg(int, struct iucvtty_msg *);
extern void iucvtty_skip_msg_residual(int, size_t *);
extern void iucvtty_skip_msg_chunk(int, size_t *);
extern ssize_t __write(int, const void*, size_t);