linux-kernel - Re: [PATCH v2] Documentation/tracing: Mention that RESET_ATTACK

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Message-ID: <878quzizlj.fsf@trenco.lwn.net>
Date: Mon, 07 Oct 2024 11:37:12 -0600
From: Jonathan Corbet <corbet@....net>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Linux Trace Kernel
 <linux-trace-kernel@...r.kernel.org>, linux-doc@...r.kernel.org, Masami
 Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, Mike Rapoport <mike.rapoport@...il.com>,
 Kees Cook <keescook@...omium.org>, Ard Biesheuvel <ardb@...nel.org>, Hans
 de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH v2] Documentation/tracing: Mention that
 RESET_ATTACK_MITIGATION can clear memory

Steven Rostedt <rostedt@...dmis.org> writes:

> On Mon, 07 Oct 2024 11:06:06 -0600
> Jonathan Corbet <corbet@....net> wrote:
>
>> Steven Rostedt <rostedt@...dmis.org> writes:
>> 
>> > Jon,
>> >
>> > This version should be good to go.  
>> 
>> Applied, thanks.
>
> And I now see I sent an older version that had a typo in it :-p
>
>
> +			Note, saving the trace buffer across reboots does require that the system
> +			is set up to not wipe memory. For instance, CONFIG_RESET_ATTACK_MITIGATION
> +			can force a memory reset on boot which will clear any trace that was stored.
> +			This is just one of many ways that can clear memory. Make sure you system
>
> 										       your system
>
> +			keeps the content of memory across reboots before relying on this option.
> +
>
> I can send a v3.

*Grumble... :)

I haven't pushed out my tree yet, so I can replace the other one.

jon