linux-kernel - Re: [PATCH] x86: Disable kernel stack offset randomization for !TSC

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Date:   Sun, 8 Jan 2023 20:39:09 +0000 (GMT)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     Borislav Petkov <bp@...en8.de>
cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] x86: Disable kernel stack offset randomization for
 !TSC

On Sun, 8 Jan 2023, Borislav Petkov wrote:

> > processor	: 0
> > vendor_id	: GenuineIntel
> > cpu family	: 4
> > model		: 3
> > model name	: 486 DX/2
> > stepping	: 5
> 
> Real hw?
> 
> If so, LOL, amazing that a box like that still even boots.

 Why?  I have slower non-x86 hardware that boots current Linux.  This box 
at least has 128MiB of RAM (I still look forward to doubling it if I find 
the right modules) and boots quite quickly.  It's portable (luggable) too.

> A modern phone is likely orders of magnitudes more powerful than this relic.

 It doesn't provide the environment to verify that EISA FDDI networking 
(defxx.c) continues to operate as expected though.

  Maciej