linux-kernel - Re: [PATCH 00/37 v6] PTI support for x86-32

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Message-ID: <CA+55aFwg75rOXN5Q0qHf_GF-hnVo8mjxnTo2FbM993fuc8x7Gw@mail.gmail.com>
Date:   Mon, 23 Apr 2018 09:45:38 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     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>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.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>,
        David Laight <David.Laight@...lab.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Eduardo Valentin <eduval@...zon.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Will Deacon <will.deacon@....com>,
        "Liguori, Anthony" <aliguori@...zon.com>,
        Daniel Gruss <daniel.gruss@...k.tugraz.at>,
        Hugh Dickins <hughd@...gle.com>,
        Kees Cook <keescook@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Waiman Long <llong@...hat.com>, Pavel Machek <pavel@....cz>,
        "David H . Gutteridge" <dhgutteridge@...patico.ca>,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH 00/37 v6] PTI support for x86-32

On Mon, Apr 23, 2018 at 8:47 AM, Joerg Roedel <joro@...tes.org> wrote:
>
> here is the new version of my PTI patches for x86-32 which
> implement last weeks review comments.

Just one question: have you checked the page table setup for the
basics wrt the USER bit in particular?

No global pages should be marked PAGE_USER, with the possible
exception of that nasty old vsyscall page.

And it would be nice to verify that the page tables for kernel
mappings also don't have PAGE_USER on them, although again that
vsyscall page can cause problems.

                  Linus