linux-kernel - [PATCH] char: lack of bool string made CONFIG

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Message-Id: <1481675545-84255-1-git-send-email-jbires@google.com>
Date:   Tue, 13 Dec 2016 16:32:25 -0800
From:   Max <jbires@...gle.com>
To:     arnd@...db.de
Cc:     gregkh@...uxfoundation.org, josh@...htriplett.org,
        linux-kernel@...r.kernel.org, Max Bires <jbires@...gle.com>
Subject: [PATCH] char: lack of bool string made CONFIG_DEVPORT always on

From: Max Bires <jbires@...gle.com>

Without a bool string present, using "# CONFIG_DEVPORT is not set" in
defconfig files would not actually unset devport. This ensured 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@...gle.com>
---
 drivers/char/Kconfig | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 7ad3127..d647e7e 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -589,10 +589,13 @@ config TELCLOCK
 	  controlling the behavior of this hardware.
 
 config DEVPORT
-	bool
+	bool "/dev/port character device"
 	depends on !M68K
 	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.
 
 config DCC_TTY
 	tristate "DCC tty driver"
-- 
2.8.0.rc3.226.g39d4020