linux-hardening - Re: [RFC PATCH v2 18/19] x86/mm: Add PKS table soft mode

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Date:   Tue, 31 Aug 2021 17:55:17 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To:     "peterz@...radead.org" <peterz@...radead.org>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "rdunlap@...radead.org" <rdunlap@...radead.org>,
        "rppt@...nel.org" <rppt@...nel.org>,
        "vbabka@...e.cz" <vbabka@...e.cz>,
        "x86@...nel.org" <x86@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "Lutomirski, Andy" <luto@...nel.org>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "shakeelb@...gle.com" <shakeelb@...gle.com>
CC:     "Williams, Dan J" <dan.j.williams@...el.com>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        "Weiny, Ira" <ira.weiny@...el.com>
Subject: Re: [RFC PATCH v2 18/19] x86/mm: Add PKS table soft mode

On Mon, 2021-08-30 at 20:49 -0700, Randy Dunlap wrote:
> On 8/30/21 4:59 PM, Rick Edgecombe wrote:
> > diff --git a/Documentation/admin-guide/kernel-parameters.txt
> > b/Documentation/admin-guide/kernel-parameters.txt
> > index 7902fce7f1da..8bb290fee77f 100644
> > --- a/Documentation/admin-guide/kernel-parameters.txt
> > +++ b/Documentation/admin-guide/kernel-parameters.txt
> > @@ -4254,6 +4254,10 @@
> >   	nopti		[X86-64]
> >   			Equivalent to pti=off
> >   
> > +	nopkstables	[X86-64] Disable PKS page table protection
> > +
> > +	pkstablessoft	[X86-64] Warn instead of oops on pks tables
> > violations
> 
> preferably		                                 PKS
> 
Sure, thanks.
> > +
> >   	pty.legacy_count=
> >   			[KNL] Number of legacy pty's. Overwrites
> > compiled-in
> >   			default number.
> 
>