linux-hardening - Re: [PATCH v3 2/2] pstore/ramoops: Add ramoops.mem

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Message-ID: <20240612145228.5bf426e0@rorschach.local.home>
Date: Wed, 12 Jun 2024 14:52:28 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Kees Cook <kees@...nel.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>, Ard Biesheuvel <ardb@...nel.org>, Mike
 Rapoport <rppt@...nel.org>
Subject: Re: [PATCH v3 2/2] pstore/ramoops: Add ramoops.mem_name= command
 line option

On Wed, 12 Jun 2024 11:45:57 -0700
Kees Cook <kees@...nel.org> wrote:

> On Tue, Jun 11, 2024 at 10:49:13AM -0400, Steven Rostedt wrote:
> > From: "Steven Rostedt (Google)" <rostedt@...dmis.org>
> > 
> > Add a method to find a region specified by reserve_mem=nn:align:name for
> > ramoops. Adding a kernel command line parameter:
> > 
> >   reserve_mem=12M:4096:oops ramoops.mem_name=oops
> > 
> > Will use the size and location defined by the memmap parameter where it
> > finds the memory and labels it "oops". The "oops" in the ramoops option
> > is used to search for it.
> > 
> > This allows for arbitrary RAM to be used for ramoops if it is known that
> > the memory is not cleared on kernel crashes or soft reboots.
> > 
> > Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>  
> 
> Acked-by: Kees Cook <kees@...nel.org>
> 
> Let me know if this should go via the pstore tree, if you'd rather carry
> it?
> 

I'm going to send out another version to cover some more comments that
were made, and perhaps it's best if Mike Rapoport takes it through his
tree.

Thanks!

-- Steve