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Date: Fri, 25 Jan 2019 11:30:04 -0800
From: Matthew Wilcox <willy@...radead.org>
To: Kees Cook <keescook@...omium.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Linux-MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
Rik van Riel <riel@...riel.com>, Christoph Lameter <cl@...ux.com>,
Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH] mm: Prevent mapping slab pages to userspace
On Sat, Jan 26, 2019 at 07:44:40AM +1300, Kees Cook wrote:
> > - if (PageAnon(page))
> > + if (PageAnon(page) || PageSlab(page))
>
> Are there other types that should not get mapped? (Or better yet, is
> there a whitelist of those that are okay to be mapped?)
Funny you should ask; I think the next patch in this series looks like this:
- if (PageAnon(page) || PageSlab(page))
+ if (PageAnon(page) || PageSlab(page) || page_has_type(page))
but let's see if there's something I've overlooked with this patch.
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