linux-kernel - Re: [PATCH v15 00/17] arm64: untag user pointers passed to the kernel

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Date:   Tue, 28 May 2019 16:14:45 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Kees Cook <keescook@...omium.org>
Cc:     Evgenii Stepanov <eugenis@...gle.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-rdma@...r.kernel.org, linux-media@...r.kernel.org,
        kvm@...r.kernel.org,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yishai Hadas <yishaih@...lanox.com>,
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        Jens Wiklander <jens.wiklander@...aro.org>,
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        Dmitry Vyukov <dvyukov@...gle.com>,
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        Dave Martin <Dave.Martin@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Szabolcs Nagy <Szabolcs.Nagy@....com>,
        Elliott Hughes <enh@...gle.com>,
        Khalid Aziz <khalid.aziz@...cle.com>
Subject: Re: [PATCH v15 00/17] arm64: untag user pointers passed to the kernel

Thanks for a lot of valuable input! I've read through all the replies
and got somewhat lost. What are the changes I need to do to this
series?

1. Should I move untagging for memory syscalls back to the generic
code so other arches would make use of it as well, or should I keep
the arm64 specific memory syscalls wrappers and address the comments
on that patch?

2. Should I make untagging opt-in and controlled by a command line argument?

3. Should I "add Documentation/core-api/user-addresses.rst to describe
proper care and handling of user space pointers with untagged_addr(),
with examples based on all the cases seen so far in this series"?
Which examples specifically should it cover?

Is there something else?