From: Andrew Morton <akpm@linux-foundation.org>
To: Matthew Wilcox <willy@infradead.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Rik van Riel <riel@surriel.com>, Christoph Lameter <cl@linux.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
kernel-hardening@lists.openwall.com,
Kees Cook <keescook@chromium.org>,
Michael Ellerman <mpe@ellerman.id.au>
Subject: Re: [PATCH] mm: Prevent mapping slab pages to userspace
Date: Mon, 28 Jan 2019 10:20:55 -0800 [thread overview]
Message-ID: <20190128102055.5b0790549542891c4dca47a3@linux-foundation.org> (raw)
In-Reply-To: <20190125173827.2658-1-willy@infradead.org>
On Fri, 25 Jan 2019 09:38:27 -0800 Matthew Wilcox <willy@infradead.org> 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?
next prev parent reply other threads:[~2019-01-28 18:20 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-25 17:38 Matthew Wilcox
2019-01-25 18:44 ` Kees Cook
2019-01-25 18:44 ` Kees Cook
2019-01-25 19:30 ` Matthew Wilcox
2019-01-28 18:20 ` Andrew Morton [this message]
2019-01-28 19:00 ` Kees Cook
2019-01-28 20:08 ` Christopher Lameter
2019-01-31 0:37 ` Michael Ellerman
2019-01-31 6:03 ` Pekka Enberg
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