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    SubjectRe: [PATCH v2 29/39] x86/cet/shstk: Support wrss for userspace
    On Mon, Oct 03, 2022 at 03:28:47PM -0700, Kees Cook wrote:
    > On Thu, Sep 29, 2022 at 03:29:26PM -0700, Rick Edgecombe wrote:
    > > For the current shadow stack implementation, shadow stacks contents easily
    > > be arbitrarily provisioned with data.
    >
    > I can't parse this sentence.
    >
    > > This property helps apps protect
    > > themselves better, but also restricts any potential apps that may want to
    > > do exotic things at the expense of a little security.
    >
    > Is anything using this right now? Wouldn't thing be safer without WRSS?
    > (Why can't we skip this patch?)

    CRIU uses WRSS to restore the shadow stack contents.

    > --
    > Kees Cook

    --
    Sincerely yours,
    Mike.

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