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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?



  parent reply	other threads:[~2019-01-28 18:21 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-25 17:38 [PATCH] mm: Prevent mapping slab pages to userspace 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 19:00     ` Kees Cook
2019-01-28 20:08     ` Christopher Lameter
2019-01-28 20:08       ` Christopher Lameter
2019-01-31  0:37 ` Michael Ellerman
2019-01-31  0:37   ` Michael Ellerman
2019-01-31  6:03 ` Pekka Enberg

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