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    SubjectRe: [kernel-hardening] [PATCH v2 25/30] fork: Define usercopy region in thread_stack slab caches
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    On Mon, 2017-08-28 at 14:35 -0700, Kees Cook wrote:
    > From: David Windsor <dave@nullcore.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@redhat.com>

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