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    Subject[PATCH 4.10 52/69] char: lack of bool string made CONFIG_DEVPORT always on
    Date
    4.10-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    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"


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