linux-kernel - Re: [PATCH 32/39] Annotate hardware config module parameters in drivers/tty/

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Date:   Thu, 1 Dec 2016 16:02:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     David Howells <dhowells@...hat.com>
Cc:     linux-kernel@...r.kernel.org, gnomes@...rguk.ukuu.org.uk,
        minyard@....org, linux-security-module@...r.kernel.org,
        keyrings@...r.kernel.org, linux-serial@...r.kernel.org,
        Jiri Slaby <jslaby@...e.com>
Subject: Re: [PATCH 32/39] Annotate hardware config module parameters in
 drivers/tty/

On Thu, Dec 01, 2016 at 12:33:54PM +0000, David Howells wrote:
> When the kernel is running in secure boot mode, we lock down the kernel to
> prevent userspace from modifying the running kernel image.  Whilst this
> includes prohibiting access to things like /dev/mem, it must also prevent
> access by means of configuring driver modules in such a way as to cause a
> device to access or modify the kernel image.
> 
> To this end, annotate module_param* statements that refer to hardware
> configuration and indicate for future reference what type of parameter they
> specify.  The parameter parser in the core sees this information and can
> skip such parameters with an error message if the kernel is locked down.
> The module initialisation then runs as normal, but just sees whatever the
> default values for those parameters is.
> 
> Note that we do still need to do the module initialisation because some
> drivers have viable defaults set in case parameters aren't specified and
> some drivers support automatic configuration (e.g. PNP or PCI) in addition
> to manually coded parameters.
> 
> This patch annotates drivers in drivers/tty/.
> 
> Suggested-by: One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> cc: Jiri Slaby <jslaby@...e.com>
> cc: linux-serial@...r.kernel.org
> ---
> 
>  drivers/tty/cyclades.c              |    4 ++--
>  drivers/tty/moxa.c                  |    2 +-
>  drivers/tty/mxser.c                 |    2 +-
>  drivers/tty/rocket.c                |   10 +++++-----
>  drivers/tty/serial/8250/8250_core.c |    4 ++--
>  drivers/tty/synclink.c              |    6 +++---
>  6 files changed, 14 insertions(+), 14 deletions(-)

NAK, see my response to patch 1 of this series.

thanks,

greg k-h