linux-kernel - Re: /drivers/char/Kconfig Bug Kernel Patch

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Date:   Tue, 13 Dec 2016 14:45:30 -0800
From:   Josh Triplett <josh@...htriplett.org>
To:     Max Bires <jbires@...gle.com>
Cc:     Arnd Bergmann <arnd@...db.de>, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: /drivers/char/Kconfig Bug Kernel Patch

> From c4a21c2ac0c587094000a3daeb13eec6056dc63f Mon Sep 17 00:00:00 2001
> From: Max <jbires@...gle.com>
> Date: Fri, 9 Dec 2016 15:16:47 -0800
> Subject: [PATCH] char: lack of bool string made CONFIG_DEVPORT always on
> 
> 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>

This patch seems reasonable to me.

>  drivers/char/Kconfig | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
> index 7ad3127..70e626c 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