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

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Message-ID: <20200901144641.GA28580@lst.de>
Date:   Tue, 1 Sep 2020 16:46:41 +0200
From:   Christoph Hellwig <hch@....de>
To:     Mark Rutland <mark.rutland@....com>
Cc:     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>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] x86/uaccess: Use pointer masking to limit uaccess
 speculation

On Tue, Sep 01, 2020 at 03:02:08PM +0100, Mark Rutland wrote:
> One thing to consider is whether you need a speculation barrier after
> set_fs(). Otherwise for code like:

FYI, at least for x86 and powerpc I have a pending series to kill
set_fs().  I'd love to see someone help with the arm/arm64 side, otherwise
I'll try to get to it eventually.