From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <1504119351.26846.79.camel@redhat.com>
From: Rik van Riel <riel@redhat.com>
Date: Wed, 30 Aug 2017 14:55:51 -0400
In-Reply-To: <1503956111-36652-26-git-send-email-keescook@chromium.org>
References: <1503956111-36652-1-git-send-email-keescook@chromium.org>
	 <1503956111-36652-26-git-send-email-keescook@chromium.org>
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Subject: Re: [kernel-hardening] [PATCH v2 25/30] fork: Define usercopy
 region in thread_stack slab caches
To: Kees Cook <keescook@chromium.org>, linux-kernel@vger.kernel.org
Cc: David Windsor <dave@nullcore.net>, Ingo Molnar <mingo@kernel.org>, Andrew Morton <akpm@linux-foundation.org>, Thomas Gleixner <tglx@linutronix.de>, Andy Lutomirski <luto@kernel.org>, linux-mm@kvack.org, kernel-hardening@lists.openwall.com
List-ID: <kernel-hardening.lists.openwall.com>


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On Mon, 2017-08-28 at 14:35 -0700, Kees Cook wrote:
> From: David Windsor <dave@nullcore.net>
>=20
> In support of usercopy hardening, this patch defines a region in the
> thread_stack slab caches in which userspace copy operations are
> allowed.
> Since the entire thread_stack needs to be available to userspace, the
> entire slab contents are whitelisted. Note that the slab-based thread
> stack is only present on systems with THREAD_SIZE < PAGE_SIZE and
> !CONFIG_VMAP_STACK.
>=20

Acked-by: Rik van Riel <riel@redhat.com>

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