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

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Message-ID: <fa5fa4c6-2b02-f47e-b9ba-65cfd85f57f8@igalia.com>
Date: Fri, 12 Apr 2024 09:17:18 -0300
From: "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: "Luck, Tony" <tony.luck@...el.com>, Kees Cook <keescook@...omium.org>,
 Joel Fernandes <joel@...lfernandes.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-trace-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" <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" <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
 Peter Zijlstra <peterz@...radead.org>,
 "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>,
 Guenter Roeck <linux@...ck-us.net>, Ross Zwisler <zwisler@...gle.com>,
 "wklin@...gle.com" <wklin@...gle.com>,
 Vineeth Remanan Pillai <vineeth@...byteword.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 11/04/2024 16:40, Steven Rostedt wrote:
> [...]
> What I think I could do is to have a check after memory is allocated to
> copy the table mapping (in the heap) if it is filled. The reason I did it
> this way was because it was the easiest way to save the label to address
> memory before memory is initialized. I use a __initdata array (why waste
> memory if it's hardly ever used).
> 
> But, after memory is initialized, we can check if the table has content,
> and if so allocate a copy and store it there and use that table instead.
> That would give modules a way to find the address as well.
> 
> -- Steve
> 

Thanks Steve, seems a good idea. With that, I could test on kdumpst (the
tool used on Steam Deck), since it relies on modular pstore/ram.

Cheers!