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Date: Mon, 28 Jan 2019 10:20:55 -0800
From: Andrew Morton <>
To: Matthew Wilcox <>
Cc:,, Rik van Riel
 <>, Christoph Lameter <>, Pekka Enberg
 <>, David Rientjes <>, Joonsoo Kim
 <>,, Kees Cook
 <>, Michael Ellerman <>
Subject: Re: [PATCH] mm: Prevent mapping slab pages to userspace

On Fri, 25 Jan 2019 09:38:27 -0800 Matthew Wilcox <> wrote:

> It's never appropriate to map a page allocated by SLAB into userspace.
> A buggy device driver might try this, or an attacker might be able to
> find a way to make it happen.

It wouldn't surprise me if someone somewhere is doing this.  Rather
than mysteriously breaking their code, how about we emit a warning and
still permit it to proceed, for a while?

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