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s390/3270: hangup the 3270 tty after a disconnect

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The disconnect and later reconnect of a 3270 terminal does not do
a tty hangup. The current session is resumed which is a security
issue.

Do a tty hangup after a unit check has been received.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2016-05-02 15:09:01 +02:00
parent 7e36eff1ee
commit 0c75691492
1 changed files with 35 additions and 3 deletions
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38
drivers/s390/char/tty3270.c
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@ -92,6 +92,7 @@ struct tty3270 {
unsigned char inattr; /* Visible/invisible input. */
int throttle, attn; /* tty throttle/unthrottle. */
struct tasklet_struct readlet; /* Tasklet to issue read request. */
struct tasklet_struct hanglet; /* Tasklet to hang up the tty. */
struct kbd_data *kbd; /* key_maps stuff. */
/* Escape sequence parsing. */
@ -645,6 +646,16 @@ tty3270_issue_read(struct tty3270 *tp, int lock)
}
}
/*
* Hang up the tty
*/
static void
tty3270_hangup_tasklet(struct tty3270 *tp)
{
tty_port_tty_hangup(&tp->port, true);
raw3270_put_view(&tp->view);
}
/*
* Switch to the tty view.
*/
@ -678,11 +689,14 @@ tty3270_irq(struct tty3270 *tp, struct raw3270_request *rq, struct irb *irb)
}
if (rq) {
if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
rq->rc = -EIO;
else
raw3270_get_view(&tp->view);
tasklet_schedule(&tp->hanglet);
} else {
/* Normal end. Copy residual count. */
rq->rescnt = irb->scsw.cmd.count;
}
} else if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
/* Interrupt without an outstanding request -> update all */
tp->update_flags = TTY_UPDATE_ALL;
@ -739,6 +753,9 @@ tty3270_alloc_view(void)
tasklet_init(&tp->readlet,
(void (*)(unsigned long)) tty3270_read_tasklet,
(unsigned long) tp->read);
tasklet_init(&tp->hanglet,
(void (*)(unsigned long)) tty3270_hangup_tasklet,
(unsigned long) tp);
INIT_WORK(&tp->resize_work, tty3270_resize_work);
return tp;
@ -1812,7 +1829,22 @@ tty3270_unthrottle(struct tty_struct * tty)
static void
tty3270_hangup(struct tty_struct *tty)
{
// FIXME: implement
struct tty3270 *tp;
tp = tty->driver_data;
if (!tp)
return;
spin_lock_bh(&tp->view.lock);
tp->cx = tp->saved_cx = 0;
tp->cy = tp->saved_cy = 0;
tp->highlight = tp->saved_highlight = TAX_RESET;
tp->f_color = tp->saved_f_color = TAC_RESET;
tty3270_blank_screen(tp);
while (tp->nr_lines < tp->view.rows - 2)
tty3270_blank_line(tp);
tp->update_flags = TTY_UPDATE_ALL;
spin_unlock_bh(&tp->view.lock);
tty3270_set_timer(tp, 1);
}
static void