linux-kernel - Re: [PATCH 09/38] Annotate hardware config module parameters in drivers/i2c/

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Message-ID: <20170420093137.5d28916d@endymion>
Date:   Thu, 20 Apr 2017 09:31:37 +0200
From:   Jean Delvare <jdelvare@...e.de>
To:     David Howells <dhowells@...hat.com>
Cc:     linux-kernel@...r.kernel.org, gnomes@...rguk.ukuu.org.uk,
        Wolfram Sang <wsa@...-dreams.de>, gregkh@...uxfoundation.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        linux-i2c@...r.kernel.org
Subject: Re: [PATCH 09/38] Annotate hardware config module parameters in
 drivers/i2c/

On Wed, 05 Apr 2017 17:58:03 +0100, 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/i2c/.
> 
> Suggested-by: Alan Cox <gnomes@...rguk.ukuu.org.uk>
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: Wolfram Sang <wsa@...-dreams.de>
> cc: Jean Delvare <jdelvare@...e.com>
> cc: linux-i2c@...r.kernel.org
> (...)

Acked-by: Jean Delvare <jdelvare@...e.de>

-- 
Jean Delvare
SUSE L3 Support