linux-kernel - Re: [RFC PATCH] x86/split_lock: Disable SLD if an unaware (out-of-tree) module enables VMX

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Message-ID: <CALCETrX-OccmPmJw5cXQEVb0d0OuJGmK_9vsf+dGo6Kqkp+7FA@mail.gmail.com>
Date:   Mon, 6 Apr 2020 15:54:23 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "Kenneth R. Crudup" <kenny@...ix.com>,
        Jessica Yu <jeyu@...nel.org>,
        Rasmus Villemoes <rasmus.villemoes@...vas.dk>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Xiaoyao Li <xiaoyao.li@...el.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Tony Luck <tony.luck@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        David Laight <David.Laight@...lab.com>,
        Doug Covelli <dcovelli@...are.com>
Subject: Re: [RFC PATCH] x86/split_lock: Disable SLD if an unaware
 (out-of-tree) module enables VMX

On Mon, Apr 6, 2020 at 10:11 AM Christoph Hellwig <hch@...radead.org> wrote:
>
> On Mon, Apr 06, 2020 at 06:01:57PM +0200, Peter Zijlstra wrote:
> > Please feel free to use my pgprot_nx() and apply liberally on any
> > exported function.
> >
> > But crucially, I don't think any of the still exported functions allows
> > getting memory in the text range, and if you want to run code outside of
> > the text range, things become _much_ harder. That said, modules
> > shouldn't be able to create executable code, full-stop (IMO).
>
> This is what i've got for now:
>
> http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/sanitize-vmalloc-api

You have:

 mm: remove __get_vm_area

Switch the two remaining callers to use __get_vm_area instead.

The second line contains a typo :)

Otherwise this looks pretty good.