linux-kernel - Re: [PATCH] x86/uaccess: Use pointer masking to limit uaccess speculation

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Message-ID: <20200903065613.GA18731@lst.de>
Date:   Thu, 3 Sep 2020 08:56:13 +0200
From:   Christoph Hellwig <hch@....de>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Christoph Hellwig <hch@....de>,
        Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Will Deacon <will@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Waiman Long <longman@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH] x86/uaccess: Use pointer masking to limit uaccess
 speculation

On Wed, Sep 02, 2020 at 06:23:30PM +0100, Mark Rutland wrote:
> I've pushed an initial/incomplete/WIP stab (just the kernel accessors)
> to:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/log/?h=arm64/set_fs-removal

Thanks!

> ... and doing that made it clear that the necessary arm64 rework is a
> bit more fractal than I thought (e.g. SDEI bits), so it might be a short
> while before I post a series.

SDEI is just forcing back a KERNEL_DS to a normal USER_DS, isn't it?

> 
> It might be handy to have a stable branch with the common bits so that
> the arm64 rework could go via the arm64 tree in case there's any
> fallout.

The series will need at least one more repost, but hopefully I'll have
s stable branch soon.