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Date: Wed, 30 Aug 2017 14:55:51 -0400
From: Rik van Riel <riel@...hat.com>
To: Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org
Cc: David Windsor <dave@...lcore.net>, Ingo Molnar <mingo@...nel.org>, 
 Andrew Morton <akpm@...ux-foundation.org>, Thomas Gleixner
 <tglx@...utronix.de>, Andy Lutomirski <luto@...nel.org>,
 linux-mm@...ck.org, kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH v2 25/30] fork: Define usercopy
 region in thread_stack slab caches

On Mon, 2017-08-28 at 14:35 -0700, Kees Cook wrote:
> From: David Windsor <dave@...lcore.net>
> 
> 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.
> 

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

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