linux-kernel - Re: [patch 11/16] x86/ldt: Force access bit for CS/SS

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Message-ID: <20171212190410.yhgc7xplx4hwem2n@hirez.programming.kicks-ass.net>
Date:   Tue, 12 Dec 2017 20:04:10 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Andy Lutomirski <luto@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Borislav Petkov <bpetkov@...e.de>,
        Greg KH <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...gle.com>,
        Hugh Dickins <hughd@...gle.com>,
        Brian Gerst <brgerst@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        David Laight <David.Laight@...lab.com>,
        Eduardo Valentin <eduval@...zon.com>, aliguori@...zon.com,
        Will Deacon <will.deacon@....com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [patch 11/16] x86/ldt: Force access bit for CS/SS

On Tue, Dec 12, 2017 at 07:41:39PM +0100, Thomas Gleixner wrote:
> The pages are populated _before_ the new ldt is installed. So no memory
> pressure issue, nothing. If the populate fails, then modify_ldt() returns
> with an error.

Also, these pages are not visible to reclaim. They're not pagecache and
we didn't install a shrinker.