linux-kernel - Re: [PATCH v2] x86: Disable kernel stack offset randomization for !TSC

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Date:   Thu, 12 Jan 2023 11:58:04 +0000 (GMT)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     Borislav Petkov <bp@...en8.de>
cc:     "H. Peter Anvin" <hpa@...or.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] x86: Disable kernel stack offset randomization for
 !TSC

On Thu, 12 Jan 2023, Borislav Petkov wrote:

> > Not to mention that we could use rdrand here if it is available (although it
> > is slower than rdtsc.)
> 
> Yeah, no RDRAND on 486. :)

 And not even in my 2009 copy of the SDM (the 2013 one does have it), so 
it must have arrived slightly later than just after the 486. ;)

  Maciej