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Date: Wed, 30 Aug 2017 14:55:51 -0400
From: Rik van Riel <>
To: Kees Cook <>,
Cc: David Windsor <>, Ingo Molnar <>, 
 Andrew Morton <>, Thomas Gleixner
 <>, Andy Lutomirski <>,,
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 <>
> 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

Acked-by: Rik van Riel <>

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