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Date: Tue, 19 Jan 2016 15:59:46 -0800
From: Kees Cook <>
To: "Schaufler, Casey" <>
Cc: "" <>
Subject: Re: Still working on PAX_USERCOPY

On Thu, Jan 14, 2016 at 5:43 PM, Schaufler, Casey
<> wrote:
> Just a brief status update on my work on PAX_USERCOPY. I’ve ditched my first
> two attempts at doing somewhat simple minded cut’n’patch and am going to
> have to take a more engineering (e.g. understanding what’s really going on)
> approach. The good news is that I’ve made enough mistakes to think there
> aren’t that many left for a project this size.

Thanks for the report! Were you able to use or improve on the
lib/test_user_copy.c tests during your experiments? (Or maybe we just
need a separate lkdtm test?)

What kinds of dead-ends did you run into?


Kees Cook
Chrome OS & Brillo Security

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