Patch "char: lack of bool string made CONFIG_DEVPORT always on" has been added to the 4.9-stable tree

Patch "char: lack of bool string made CONFIG_DEVPORT always on" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    char: lack of bool string made CONFIG_DEVPORT always on

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     char-lack-of-bool-string-made-config_devport-always-on.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From f2cfa58b136e4b06a9b9db7af5ef62fbb5992f62 Mon Sep 17 00:00:00 2001
From: Max Bires <jbires@google.com>
Date: Tue, 3 Jan 2017 08:18:07 -0800
Subject: char: lack of bool string made CONFIG_DEVPORT always on

From: Max Bires <jbires@google.com>

commit f2cfa58b136e4b06a9b9db7af5ef62fbb5992f62 upstream.

Without a bool string present, using "# CONFIG_DEVPORT is not set" in
defconfig files would not actually unset devport. This esnured that
/dev/port was always on, but there are reasons a user may wish to
disable it (smaller kernel, attack surface reduction) if it's not being
used. Adding a message here in order to make this user visible.

Signed-off-by: Max Bires <jbires@google.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/char/Kconfig |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -571,9 +571,12 @@ config TELCLOCK
 	  controlling the behavior of this hardware.
 
 config DEVPORT
-	bool
+	bool "/dev/port character device"
 	depends on ISA || PCI
 	default y
+	help
+	  Say Y here if you want to support the /dev/port device. The /dev/port
+	  device is similar to /dev/mem, but for I/O ports.
 
 source "drivers/s390/char/Kconfig"
 


Patches currently in stable-queue which might be from jbires@google.com are

queue-4.9/char-lack-of-bool-string-made-config_devport-always-on.patch