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af_iucv: exploit target message class support of IUCV

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The first 4 bytes of data to be sent are stored additionally into
the message class field of the send request. A receiving target
program (not an af_iucv socket program) can make use of this
information to pre-screen incoming messages.

Signed-off-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun 2008-06-09 15:51:03 -07:00 committed by David S. Miller
parent 7b9d1b22a3
commit 469689a4dd
1 changed files with 1 additions and 0 deletions
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net/iucv/af_iucv.c
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@ -644,6 +644,7 @@ static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
}
txmsg.class = 0;
memcpy(&txmsg.class, skb->data, skb->len >= 4 ? 4 : skb->len);
txmsg.tag = iucv->send_tag++;
memcpy(skb->cb, &txmsg.tag, 4);
skb_queue_tail(&iucv->send_skb_q, skb);