linux-hardening - Re: [POC][RFC][PATCH 0/2] pstore/mm/x86: Add wildcard memmap to map pstore consistently

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Date: Tue, 9 Apr 2024 15:19:48 -0700
From: Kees Cook <keescook@...omium.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Lorenzo Stoakes <lstoakes@...il.com>, linux-mm@...ck.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Tony Luck <tony.luck@...el.com>,
	"Guilherme G. Piccoli" <gpiccoli@...lia.com>,
	linux-hardening@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
	Ross Zwisler <zwisler@...gle.com>, wklin@...gle.com,
	Vineeth Remanan Pillai <vineeth@...byteword.org>,
	Joel Fernandes <joel@...lfernandes.org>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Linus Torvalds <torvalds@...uxfoundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>
Subject: Re: [POC][RFC][PATCH 0/2] pstore/mm/x86: Add wildcard memmap to map
 pstore consistently

On Tue, Apr 09, 2024 at 05:23:58PM -0400, Steven Rostedt wrote:
> On Tue, 09 Apr 2024 17:02:54 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> >   memmap=12M*4096:oops   ramoops.mem_name=oops
> 
> I forgot to mention that this makes it trivial for any machine that doesn't
> clear memory on soft-reboot, to enable console ramoops (to have access to
> the last boot dmesg without needing serial).
> 
> I tested this on a couple of my test boxes and on QEMU, and it works rather
> well.

I've long wanted a "stable for this machine and kernel" memory region
like this for pstore. It would make testing much easier.

-- 
Kees Cook