linux-kernel - Re: [PATCH 07/39] x86/entry/32: Enter the kernel via trampoline stack

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Message-ID: <20180717070725.paxlewuu4z4qd3cu@suse.de>
Date:   Tue, 17 Jul 2018 09:07:25 +0200
From:   Joerg Roedel <jroedel@...e.de>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <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>,
        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>
Subject: Re: [PATCH 07/39] x86/entry/32: Enter the kernel via trampoline stack

On Fri, Jul 13, 2018 at 10:21:39AM -0700, Andy Lutomirski wrote:
> On Fri, Jul 13, 2018 at 3:56 AM, Joerg Roedel <joro@...tes.org> wrote:
> > Right, I implement a more restrictive check.
> 
> But the check needs to be correct or we'll mess up, right?  I think
> the code will be much more robust and easier to review if you check
> "on the entry stack" instead of ">= the entry stack".  (Or <= -- I can
> never remember how this works in AT&T syntax.)

Yeah, I re-used the check implemented on the NMI entry path, it checks
exactly for the entry-stack range.


Regards,

	Joerg