linux-kernel - Re: [PATCH v4 2/6] printk: honor the max_reason field in kmsg

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Message-ID: <202005221032.859452DFA0@keescook>
Date:   Fri, 22 May 2020 10:34:17 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Pavel Tatashin <pasha.tatashin@...een.com>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>,
        Jonathan Corbet <corbet@....net>,
        Benson Leung <bleung@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v4 2/6] printk: honor the max_reason field in kmsg_dumper

On Fri, May 22, 2020 at 06:51:20PM +0200, Petr Mladek wrote:
> On Fri 2020-05-15 11:44:30, Kees Cook wrote:
> > From: Pavel Tatashin <pasha.tatashin@...een.com>
> > 
> > kmsg_dump() allows to dump kmesg buffer for various system events: oops,
> > panic, reboot, etc. It provides an interface to register a callback call
> > for clients, and in that callback interface there is a field "max_reason"
> > which gets ignored unless always_kmsg_dump is passed as kernel parameter.
> 
> Strictly speaking, this is not fully true. "max_reason" field is not
> ignored when set to KMSG_DUMP_PANIC even when always_kmsg_dump was not set.
> 
> It should be something like:
> 
> "which gets ignored for reason higher than KMSG_DUMP_OOPS unless
> always_kmsg_dump is passed as kernel parameter".
> 
> Heh, I wonder if anyone will be able to parse this ;-)

Ah yeah, good point. I've reworded things like this:


    kmsg_dump() allows to dump kmesg buffer for various system events: oops,
    panic, reboot, etc. It provides an interface to register a callback
    call for clients, and in that callback interface there is a field
    "max_reason", but it was getting ignored when set to any "reason"
    higher than KMSG_DUMP_OOPS unless "always_kmsg_dump" was passed as
    kernel parameter.

    Allow clients to actually control their "max_reason", and keep the
    current behavior when "max_reason" is not set.

> Otherwise, it looks good to me. With the updated commit message:
> 
> Reviewed-by: Petr Mladek <pmladek@...e.com>

Thanks!

-- 
Kees Cook