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Date: Mon, 28 Jan 2019 20:08:23 +0000
From: Christopher Lameter <cl@...ux.com>
To: Kees Cook <keescook@...omium.org>
cc: Andrew Morton <akpm@...ux-foundation.org>,
Matthew Wilcox <willy@...radead.org>, Linux-MM <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>, Rik van Riel <riel@...riel.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 Tue, 29 Jan 2019, Kees Cook wrote:
> It seems like a fatal condition to me? There's nothing to check that
> such a page wouldn't get freed by the slab while still mapped to
> userspace, right?
Lets just fail the code. Currently this may work with SLUB. But SLAB and
SLOB overlay fields with mapcount. So you would have a corrupted page
struct if you mapped a slab page to user space.
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