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Re: [PATCH 05/38] Annotate hardware config module parameters in drivers/char/

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On Wed, Apr 05, 2017 at 05:57:30PM +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/char/.
> 
> Suggested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
> Signed-off-by: David Howells <dhowells@redhat.com>
> cc: Arnd Bergmann <arnd@arndb.de>
> cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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[PATCH 00/38] Annotate hw config module params for future lockdown David Howells <dhowells@redhat.com> - 2017-04-05 19:20 +0200
  [PATCH 13/38] Annotate hardware config module parameters in  drivers/media/ David Howells <dhowells@redhat.com> - 2017-04-05 19:20 +0200
  [PATCH 08/38] Annotate hardware config module parameters in  drivers/gpio/ David Howells <dhowells@redhat.com> - 2017-04-05 19:20 +0200
    Re: [PATCH 08/38] Annotate hardware config module parameters in drivers/gpio/ Linus Walleij <linus.walleij@linaro.org> - 2017-04-07 12:50 +0200
      Re: [PATCH 08/38] Annotate hardware config module parameters in drivers/gpio/ David Howells <dhowells@redhat.com> - 2017-04-07 15:00 +0200
  [PATCH 07/38] Annotate hardware config module parameters in  drivers/cpufreq/ David Howells <dhowells@redhat.com> - 2017-04-05 19:30 +0200
    Re: [PATCH 07/38] Annotate hardware config module parameters in  drivers/cpufreq/ Viresh Kumar <viresh.kumar@linaro.org> - 2017-04-10 12:40 +0200
  [PATCH 06/38] Annotate hardware config module parameters in  drivers/clocksource/ David Howells <dhowells@redhat.com> - 2017-04-05 19:30 +0200
  [PATCH 02/38] Annotate hardware config module parameters in  arch/x86/mm/ David Howells <dhowells@redhat.com> - 2017-04-05 19:30 +0200
    Re: [PATCH 02/38] Annotate hardware config module parameters in  arch/x86/mm/ Steven Rostedt <rostedt@goodmis.org> - 2017-04-05 19:40 +0200
  [PATCH 03/38] Annotate hardware config module parameters in  drivers/char/ipmi/ David Howells <dhowells@redhat.com> - 2017-04-05 19:30 +0200
  [PATCH 05/38] Annotate hardware config module parameters in  drivers/char/ David Howells <dhowells@redhat.com> - 2017-04-05 19:30 +0200
    Re: [PATCH 05/38] Annotate hardware config module parameters in  drivers/char/ Greg KH <gregkh@linuxfoundation.org> - 2017-04-08 17:30 +0200
  [PATCH 04/38] Annotate hardware config module parameters in  drivers/char/mwave/ David Howells <dhowells@redhat.com> - 2017-04-05 19:30 +0200
  [PATCH 01/38] Annotate module params that specify hardware  parameters (eg. ioport) David Howells <dhowells@redhat.com> - 2017-04-05 19:30 +0200

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