linux-kernel - RE: [RFC PATCH 00/16] PTI support for x86-32

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Message-ID: <7f37ff1c10b04b2386c2044cdc8e38be@AcuMS.aculab.com>
Date:   Mon, 22 Jan 2018 09:55:31 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Nadav Amit' <nadav.amit@...il.com>, Joerg Roedel <joro@...tes.org>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Andy Lutomirski" <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        "Josh Poimboeuf" <jpoimboe@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Brian Gerst <brgerst@...il.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Eduardo Valentin <eduval@...zon.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Will Deacon <will.deacon@....com>,
        "aliguori@...zon.com" <aliguori@...zon.com>,
        "daniel.gruss@...k.tugraz.at" <daniel.gruss@...k.tugraz.at>,
        "hughd@...gle.com" <hughd@...gle.com>,
        "keescook@...gle.com" <keescook@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Waiman Long <llong@...hat.com>,
        "jroedel@...e.de" <jroedel@...e.de>
Subject: RE: [RFC PATCH 00/16] PTI support for x86-32

From: Nadav Amit
> Sent: 21 January 2018 23:46
> 
> I wanted to see whether segments protection can be a replacement for PTI
> (yes, excluding SMEP emulation), or whether speculative execution “ignores”
> limit checks, similarly to the way paging protection is skipped.

That's made me remember something about segment limits applying in 64bit mode.
I really can't remember the details at all.
I'm sure it had something to do with one of the VM implementations restricting
memory accesses.

	David