Re: [PATCH v19 00/15] arm64: untag user pointers passed to the kernel

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To: Andrey Konovalov <andreyknvl@xxxxxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, amd-gfx@xxxxxxxxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-rdma@xxxxxxxxxxxxxxx, linux-media@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx
Subject: Re: [PATCH v19 00/15] arm64: untag user pointers passed to the kernel
From: Dave Hansen <dave.hansen@xxxxxxxxx>
Date: Wed, 31 Jul 2019 09:50:58 -0700
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>, Vincenzo Frascino <vincenzo.frascino@xxxxxxx>, Will Deacon <will.deacon@xxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Yishai Hadas <yishaih@xxxxxxxxxxxx>, Felix Kuehling <Felix.Kuehling@xxxxxxx>, Alexander Deucher <Alexander.Deucher@xxxxxxx>, Christian Koenig <Christian.Koenig@xxxxxxx>, Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>, Jens Wiklander <jens.wiklander@xxxxxxxxxx>, Alex Williamson <alex.williamson@xxxxxxxxxx>, Leon Romanovsky <leon@xxxxxxxxxx>, Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>, Dave Martin <Dave.Martin@xxxxxxx>, Khalid Aziz <khalid.aziz@xxxxxxxxxx>, enh <enh@xxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>, Kostya Serebryany <kcc@xxxxxxxxxx>, Evgeniy Stepanov <eugenis@xxxxxxxxxx>, Lee Smith <Lee.Smith@xxxxxxx>, Ramana Radhakrishnan <Ramana.Radhakrishnan@xxxxxxx>, Jacob Bramley <Jacob.Bramley@xxxxxxx>, Ruben Ayrapetyan <Ruben.Ayrapetyan@xxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, Kevin Brodsky <kevin.brodsky@xxxxxxx>, Szabolcs Nagy <Szabolcs.Nagy@xxxxxxx>
In-reply-to: <cover.1563904656.git.andreyknvl@google.com>
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On 7/23/19 10:58 AM, Andrey Konovalov wrote:
> The mmap and mremap (only new_addr) syscalls do not currently accept
> tagged addresses. Architectures may interpret the tag as a background
> colour for the corresponding vma.

What the heck is a "background colour"? :)

Follow-Ups:
- Re: [PATCH v19 00/15] arm64: untag user pointers passed to the kernel
  - From: Kevin Brodsky

References:
- [PATCH v19 00/15] arm64: untag user pointers passed to the kernel
  - From: Andrey Konovalov

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