Re: [POC][RFC][PATCH 1/2] mm/x86: Add wildcard * option as memmap=nn*align:name

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To: Kees Cook <keescook@xxxxxxxxxxxx>
Subject: Re: [POC][RFC][PATCH 1/2] mm/x86: Add wildcard * option as memmap=nn*align:name
From: Steven Rostedt <rostedt@xxxxxxxxxxx>
Date: Tue, 9 Apr 2024 19:11:56 -0400
Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-trace-kernel@xxxxxxxxxxxxxxx, Masami Hiramatsu <mhiramat@xxxxxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Lorenzo Stoakes <lstoakes@xxxxxxxxx>, linux-mm@xxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, "Guilherme G. Piccoli" <gpiccoli@xxxxxxxxxx>, linux-hardening@xxxxxxxxxxxxxxx, Guenter Roeck <linux@xxxxxxxxxxxx>, Ross Zwisler <zwisler@xxxxxxxxxx>, wklin@xxxxxxxxxx, Vineeth Remanan Pillai <vineeth@xxxxxxxxxxxxxxx>, Joel Fernandes <joel@xxxxxxxxxxxxxxxxx>, Suleiman Souhlal <suleiman@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>
In-reply-to: <202404091521.B63E85D@keescook>
References: <20240409210254.660888920@goodmis.org> <20240409211351.075320273@goodmis.org> <202404091521.B63E85D@keescook>

On Tue, 9 Apr 2024 15:23:07 -0700
Kees Cook <keescook@xxxxxxxxxxxx> wrote:

> Do we need to involve e820 at all? I think it might be possible to just
> have pstore call request_mem_region() very early? Or does KASLR make
> that unstable?

Yeah, would that give the same physical memory each boot, and can we
guarantee that KASLR will not map the kernel over the previous location?

-- Steve

Follow-Ups:
- Re: [POC][RFC][PATCH 1/2] mm/x86: Add wildcard * option as memmap=nn*align:name
  - From: Kees Cook

References:
- [POC][RFC][PATCH 0/2] pstore/mm/x86: Add wildcard memmap to map pstore consistently
  - From: Steven Rostedt
- [POC][RFC][PATCH 1/2] mm/x86: Add wildcard * option as memmap=nn*align:name
  - From: Steven Rostedt
- Re: [POC][RFC][PATCH 1/2] mm/x86: Add wildcard * option as memmap=nn*align:name
  - From: Kees Cook

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