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Re: [PATCH v6 10/11] mm: add a user_virt_to_phys symbol

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On Fri, Sep 08, 2017 at 08:44:22AM -0700, Kees Cook wrote:
> On Fri, Sep 8, 2017 at 12:55 AM, Christoph Hellwig <hch@infradead.org> wrote:
> > On Thu, Sep 07, 2017 at 11:36:08AM -0600, Tycho Andersen wrote:
> >> We need someting like this for testing XPFO. Since it's architecture
> >> specific, putting it in the test code is slightly awkward, so let's make it
> >> an arch-specific symbol and export it for use in LKDTM.
> >
> > We really should not add an export for this.
> >
> > I think you'll want to just open code it in your test module.
> 
> Isn't that going to be fragile? Why not an export?

It is a little fragile, but it is functionality not needed at all by
the kernel, so we should not add it to the kernel image and/or export
it.

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[PATCH v6 10/11] mm: add a user_virt_to_phys symbol Tycho Andersen <tycho@docker.com> - 2017-09-07 19:40 +0200
  Re: [PATCH v6 10/11] mm: add a user_virt_to_phys symbol Christoph Hellwig <hch@infradead.org> - 2017-09-08 10:00 +0200
    Re: [PATCH v6 10/11] mm: add a user_virt_to_phys symbol Kees Cook <keescook@chromium.org> - 2017-09-08 17:50 +0200
      Re: [PATCH v6 10/11] mm: add a user_virt_to_phys symbol Christoph Hellwig <hch@infradead.org> - 2017-09-11 09:40 +0200
  Re: [kernel-hardening] [PATCH v6 10/11] mm: add a user_virt_to_phys  symbol Mark Rutland <mark.rutland@arm.com> - 2017-09-14 20:40 +0200
    Re: [kernel-hardening] [PATCH v6 10/11] mm: add a user_virt_to_phys  symbol Tycho Andersen <tycho@docker.com> - 2017-09-18 23:00 +0200

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