Changing the port close delay or type are privileged operations so make
sure to return -EPERM if a regular user tries to change them.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
---
drivers/tty/moxa.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/drivers/tty/moxa.c b/drivers/tty/moxa.c
index 5b7bc7af8b1e..63e440d900ff 100644
--- a/drivers/tty/moxa.c
+++ b/drivers/tty/moxa.c
@@ -2048,6 +2048,7 @@ static int moxa_set_serial_info(struct tty_struct *tty,
struct serial_struct *ss)
{
struct moxa_port *info = tty->driver_data;
+ unsigned int close_delay;
if (tty->index == MAX_PORTS)
return -EINVAL;
@@ -2059,19 +2060,24 @@ static int moxa_set_serial_info(struct tty_struct *tty,
ss->baud_base != 921600)
return -EPERM;
+ close_delay = msecs_to_jiffies(ss->close_delay * 10);
+
mutex_lock(&info->port.mutex);
if (!capable(CAP_SYS_ADMIN)) {
- if (((ss->flags & ~ASYNC_USR_MASK) !=
+ if (close_delay != info->port.close_delay ||
+ ss->type != info->type ||
+ ((ss->flags & ~ASYNC_USR_MASK) !=
(info->port.flags & ~ASYNC_USR_MASK))) {
mutex_unlock(&info->port.mutex);
return -EPERM;
}
- }
- info->port.close_delay = msecs_to_jiffies(ss->close_delay * 10);
+ } else {
+ info->port.close_delay = close_delay;
- MoxaSetFifo(info, ss->type == PORT_16550A);
+ MoxaSetFifo(info, ss->type == PORT_16550A);
- info->type = ss->type;
+ info->type = ss->type;
+ }
mutex_unlock(&info->port.mutex);
return 0;
}
--
2.26.3
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