linux-kernel - Re: [PATCH v4 0/7] arm64: untag user pointers passed to the kernel

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Message-ID: <CAAeHK+zqtyGzd_CZ7qKZKU-uZjZ1Pkmod5h8zzbN0xCV26nSfg@mail.gmail.com>
Date:   Tue, 26 Jun 2018 14:47:50 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Robin Murphy <robin.murphy@....com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Shuah Khan <shuah@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-doc@...r.kernel.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        linux-arch@...r.kernel.org, linux-kselftest@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Evgeniy Stepanov <eugenis@...gle.com>,
        Lee Smith <Lee.Smith@....com>,
        Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
        Jacob Bramley <Jacob.Bramley@....com>,
        Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>,
        Chintan Pandya <cpandya@...eaurora.org>
Subject: Re: [PATCH v4 0/7] arm64: untag user pointers passed to the kernel

On Wed, Jun 20, 2018 at 5:24 PM, Andrey Konovalov <andreyknvl@...gle.com> wrote:
> arm64 has a feature called Top Byte Ignore, which allows to embed pointer
> tags into the top byte of each pointer. Userspace programs (such as
> HWASan, a memory debugging tool [1]) might use this feature and pass
> tagged user pointers to the kernel through syscalls or other interfaces.
>
> This patch makes a few of the kernel interfaces accept tagged user
> pointers. The kernel is already able to handle user faults with tagged
> pointers and has the untagged_addr macro, which this patchset reuses.
>
> We're not trying to cover all possible ways the kernel accepts user
> pointers in one patchset, so this one should be considered as a start.
>
> Thanks!
>
> [1] http://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html

Hi!

Is there anything I should do to move forward with this?

I've received zero replies to this patch set (v3 and v4) over the last month.

Thanks!