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

Andrey Konovalov andreyknvl at google.com
Thu Aug 1 12:48:37 UTC 2019

On Thu, Aug 1, 2019 at 2:11 PM Kevin Brodsky <kevin.brodsky at arm.com> wrote:
> On 31/07/2019 17:50, Dave Hansen wrote:
> > 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"? :)
> Good point, this is some jargon that we started using for MTE, the idea being that
> the kernel could set a tag value (specified during mmap()) as "background colour" for
> anonymous pages allocated in that range.
> Anyway, this patch series is not about MTE. Andrey, for v20 (if any), I think it's
> best to drop this last sentence to avoid any confusion.

Sure, thanks!

> Kevin

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