This is a note to let you know that I've just added the patch titled
serdev: ttyport: add missing receive_buf sanity checks
to my tty git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git
in the tty-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From eb281683621b71ab9710d9dccbbef0c2e1769c97 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@xxxxxxxxxx>
Date: Fri, 3 Nov 2017 15:30:52 +0100
Subject: serdev: ttyport: add missing receive_buf sanity checks
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@xxxxxxxxxxxxxxx> # 4.11
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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 ce7ad0acee7a..09fbdd52a561 100644
--- a/drivers/tty/serdev/serdev-ttyport.c
+++ b/drivers/tty/serdev/serdev-ttyport.c
@@ -27,11 +27,22 @@ 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