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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Mon, 23 Apr 2018 10:49:13 -0700
Message-ID: <CA+55aFwt+o1kjgkVcxLbO_558J5zWMg_XpfmEkW2LW2eq1CiDQ@mail.gmail.com>
Subject: Re: [PATCH 00/37 v6] PTI support for x86-32
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To: Joerg Roedel <jroedel@suse.de>
Cc: Joerg Roedel <joro@8bytes.org>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@kernel.org>, "H . Peter Anvin" <hpa@zytor.com>, the arch/x86 maintainers <x86@kernel.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>, Andy Lutomirski <luto@kernel.org>, Dave Hansen <dave.hansen@intel.com>, Josh Poimboeuf <jpoimboe@redhat.com>, Juergen Gross <jgross@suse.com>, Peter Zijlstra <peterz@infradead.org>, Borislav Petkov <bp@alien8.de>, Jiri Kosina <jkosina@suse.cz>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Brian Gerst <brgerst@gmail.com>, David Laight <David.Laight@aculab.com>, Denys Vlasenko <dvlasenk@redhat.com>, Eduardo Valentin <eduval@amazon.com>, Greg KH <gregkh@linuxfoundation.org>, Will Deacon <will.deacon@arm.com>, "Liguori, Anthony" <aliguori@amazon.com>, Daniel Gruss <daniel.gruss@iaik.tugraz.at>, Hugh Dickins <hughd@google.com>, Kees Cook <keescook@google.com>, Andrea Arcangeli <aarcange@redhat.com>, Waiman Long <llong@redhat.com>, Pavel Machek <pavel@ucw.cz>, "David H . Gutteridge" <dhgutteridge@sympatico.ca>

On Mon, Apr 23, 2018 at 10:45 AM, Joerg Roedel <jroedel@suse.de> wrote:
>
> Just checked that and there are no pages with GLB and USR set, not even
> a vdso page.

Thanks.

> The vsyscall page does not exist on plain 32 bit, no? All I could find
> there is the vdso page, and that has no compat mapping anymore in recent
> upstream kernels. To my understanding the vdso page is mapped into the
> user-space portion of the address space. At least that is what I found
> while looking at this, but I might have missed something.

I guess it's just the x86-64 vsyscall page then. Thanks for checking.

                 Linus