linux-kernel - Re: [PATCH v2 0/5] firmware: add SmPL grammar to avoid issues

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Date:	Thu, 14 Jul 2016 07:52:07 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	"Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:	ming.lei@...onical.com, akpm@...ux-foundation.org, mmarek@...e.com,
	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
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Subject: Re: [PATCH v2 0/5] firmware: add SmPL grammar to avoid issues

Hi Luis,

On Thu, Jul 07, 2016 at 02:56:44AM +0200, Luis R. Rodriguez wrote:
>On Thu, Jun 16, 2016 at 03:54:16PM -0700, Luis R. Rodriguez wrote:
>> The firmware API has had some issues a while ago, some of this is
>> not well documented, and its still hard to grasp. This documents
>> some of these issues, adds SmPL grammar rules to enable us to hunt
>> for issues, and annotations to help us with our effort to finally
>> compartamentalize that pesky usermode helper.
>>
>> Previously this was just one patch, the grammar rule to help
>> find request firmware API users on init or probe, this series
>> extends that effort with usermode helper grammar rules, and some
>> annotations and documentation on the firmware_class driver to
>> avoid further issues. Documenting the usermode helper and making
>> it clear why we cannot remove it is important for analysis for
>> the next series which adds the new flexible sysdata firmware API.
>>
>> This series depends on the coccicheck series which enables
>> annotations on coccinelle patches to require a specific
>> version of coccinelle [0], as such coordination with Michal is
>> in order.
>
>Michal is out until July 11, and upon further thought such coordination
>is not need, the annotation is in place as comments and as such
>merging this now won't have any negative effects other than the version
>check. Also the patches in question for the coccicheck change are all
>acked now and I expect them to be merged anyway.
>
>Which tree should firmware changes go through ?

>> This series is also further extended next with the new sydata
>> API, the full set of changes is available on my linux-next tree [1].
>>
>> Perhaps now a good time to discuss -- if 0-day should enable the rule
>> scripts/coccinelle/api/request_firmware-usermode.cocci to be called on
>> every 0-day iteration, it runs rather fast and it should help police
>> against avoiding futher explicit users of the usermode helper.
>
>And if we are going to merge this anyone oppose enabling hunting
>for further explicit users of the usermode helper using grammar through
>0-day ?

When *.cocci scripts lands upstream they'll be auto picked up by the
0-day bot to guard new patches/commits. Are there further steps 0-day
should do for request_firmware-upstream.cocci?

Thanks,
Fengguang

>>
>> [0] https://lkml.kernel.org/r/1466116292-21843-1-git-send-email-mcgrof@kernel.org
>> [1] https://git.kernel.org/cgit/linux/kernel/git/mcgrof/linux-next.git/log/?h=20160616-sysdata-v2
>>
>> Luis R. Rodriguez (5):
>>   MAINTAINERS: extend firmware_class maintainer list
>>   firmware: annotate thou shalt not request fw on init or probe
>>   firmware: update usermode helper docs and add SmPL report
>>   firmware: add usermode helper DECLARE_FW_LOADER_USER() annotation
>>   firmware: fix fw cache to avoid usermode helper on suspend
>>
>>  Documentation/firmware_class/README                |  59 +++++++++-
>>  MAINTAINERS                                        |   1 +
>>  drivers/base/Kconfig                               |   2 +-
>>  drivers/base/firmware_class.c                      |   2 +-
>>  drivers/firmware/dell_rbu.c                        |   1 +
>>  drivers/leds/leds-lp55xx-common.c                  |   1 +
>>  include/linux/firmware.h                           |   7 ++
>>  .../request_firmware-avoid-init-probe-init.cocci   | 130 +++++++++++++++++++++
>>  .../coccinelle/api/request_firmware-usermode.cocci |  44 +++++++
>>  9 files changed, 240 insertions(+), 7 deletions(-)
>>  create mode 100644 scripts/coccinelle/api/request_firmware-avoid-init-probe-init.cocci
>>  create mode 100644 scripts/coccinelle/api/request_firmware-usermode.cocci
>>
>> --
>> 2.8.2
>>
>>
>
>-- 
>Luis Rodriguez, SUSE LINUX GmbH
>Maxfeldstrasse 5; D-90409 Nuernberg