Messages in this thread Patch in this message | | | From | Johan Hovold <> | Subject | [PATCH 1/8] serdev: ttyport: add missing receive_buf sanity checks | Date | Fri, 3 Nov 2017 15:30:52 +0100 |
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The receive_buf tty-port callback should return the number of bytes accepted and must specifically never return a negative errno (or a value larger than the buffer size) to the tty layer.
A serdev driver not providing a receive_buf callback would currently cause the flush_to_ldisc() worker to spin in a tight loop when the tty buffer pointers are incremented with -EINVAL (-22) after data has been received.
A serdev driver occasionally returning a negative errno (or a too large byte count) could cause information leaks or crashes when accessing memory outside the tty buffers in consecutive callbacks.
Fixes: cd6484e1830b ("serdev: Introduce new bus for serial attached devices") Cc: stable <stable@vger.kernel.org> # 4.11 Signed-off-by: Johan Hovold <johan@kernel.org> --- drivers/tty/serdev/serdev-ttyport.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c index 5b09ce920117..b8bc60a251c6 100644 --- a/drivers/tty/serdev/serdev-ttyport.c +++ b/drivers/tty/serdev/serdev-ttyport.c @@ -35,11 +35,22 @@ static int ttyport_receive_buf(struct tty_port *port, const unsigned char *cp, { struct serdev_controller *ctrl = port->client_data; struct serport *serport = serdev_controller_get_drvdata(ctrl); + int ret; if (!test_bit(SERPORT_ACTIVE, &serport->flags)) return 0; - return serdev_controller_receive_buf(ctrl, cp, count); + ret = serdev_controller_receive_buf(ctrl, cp, count); + + dev_WARN_ONCE(&ctrl->dev, ret < 0 || ret > count, + "receive_buf returns %d (count = %zu)\n", + ret, count); + if (ret < 0) + return 0; + else if (ret > count) + return count; + + return ret; } static void ttyport_write_wakeup(struct tty_port *port) -- 2.15.0
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