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From: Petr Mladek <pmladek@suse.com>
To: Kees Cook <keescook@chromium.org>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>,
	Anton Vorontsov <anton@enomsg.org>,
	Colin Cross <ccross@android.com>, Tony Luck <tony.luck@intel.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Rob Herring <robh+dt@kernel.org>,
	Benson Leung <bleung@chromium.org>,
	Enric Balletbo i Serra <enric.balletbo@collabora.com>,
	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	James Morris <jmorris@namei.org>, Sasha Levin <sashal@kernel.org>,
	Linux Doc Mailing List <linux-doc@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	devicetree@vger.kernel.org
Subject: Re: [PATCH v3 0/6] allow ramoops to collect all kmesg_dump events
Date: Wed, 13 May 2020 09:34:49 +0200
Message-ID: <20200513073448.GG7340@linux-b0ei> (raw)
In-Reply-To: <202005121111.6BECC45@keescook>

On Tue 2020-05-12 11:45:54, Kees Cook wrote:
> Here are the problems I see being solved by this:
> 
> - lifting kmsg dump reason filtering out of the individual pstore
>   backends and making it part of the "infrastructure", so that
>   there is a central place to set expectations. Right now there
>   is a mix of explicit and implicit kmsg dump handling:
> 
>   - arch/powerpc/kernel/nvram_64.c has a hard-coded list

It handles restart, halt, poweroff the same way.  I wonder if anyone
would want to distinguish them.

>   - drivers/firmware/efi/efi-pstore.c doesn't expect anything but
>     OOPS and PANIC.
>   - drivers/mtd/mtdoops.c tries to filter using its own dump_oops
>     and doesn't expect anything but OOPS and PANIC.
>   - fs/pstore/ram.c: has a hard-coded list and uses its own
>     dump_oops.
>   - drivers/mtd/mtdpstore.c (under development[3]) expected only
>     OOPS and PANIC and had its own dump_oops.

The others handle only panic or oops.

What about splitting the reason into two variables? One for severity
and other for shutdown behavior. I mean:

  + reason: panic, oops, emergency, shutdown    (ordered by severity)
  + handling: restart, halt, poweroff

Or we might just replace KMSG_DUMP_RESTART, KMSG_DUMP_HALT,
KMSG_DUMP_POWEROFF with a single KMSG_DUMP_SHUTDOWN.

Then the max reason variable would make sense.

Best Regards,
Petr

  reply index

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-06 21:15 Kees Cook
2020-05-06 21:15 ` [PATCH v3 1/6] printk: honor the max_reason field in kmsg_dumper Kees Cook
2020-05-06 21:15 ` [PATCH v3 2/6] pstore/platform: Pass max_reason to kmesg dump Kees Cook
2020-05-06 21:25   ` Joe Perches
2020-05-06 22:40     ` Kees Cook
2020-05-06 21:15 ` [PATCH v3 3/6] pstore/ram: Refactor DT size parsing Kees Cook
2020-05-07 12:57   ` Pavel Tatashin
2020-05-07 18:04     ` Kees Cook
2020-05-06 21:15 ` [PATCH v3 4/6] pstore/ram: Introduce max_reason and convert dump_oops Kees Cook
2020-05-06 21:17   ` Kees Cook
2020-05-12 23:35   ` Tyler Hicks
2020-05-12 23:57     ` Kees Cook
2020-05-16  2:43     ` Kees Cook
2020-05-06 21:15 ` [PATCH v3 5/6] ramoops: Add max_reason optional field to ramoops DT node Kees Cook
2020-05-06 21:15 ` [PATCH v3 6/6] pstore/ram: Adjust module param permissions to reflect reality Kees Cook
2020-05-12 13:16 ` [PATCH v3 0/6] allow ramoops to collect all kmesg_dump events Petr Mladek
2020-05-12 14:03   ` Pavel Tatashin
2020-05-12 15:52     ` Petr Mladek
2020-05-12 16:03       ` Steven Rostedt
2020-05-12 16:49       ` Pavel Tatashin
2020-05-12 18:53         ` Kees Cook
2020-05-12 18:45       ` Kees Cook
2020-05-13  7:34         ` Petr Mladek [this message]
2020-05-13  7:47           ` Kees Cook
2020-05-13 14:35             ` Pavel Tatashin
2020-05-13 20:15               ` Kees Cook

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