kernel-hardening - Re: [RFC v2 PATCH 00/13] HARDENED

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Message-ID: <CAEXv5_izCpFQ39SGL_CD9J2A5XD1TVNJm8C3S+a3TuyriLcbJQ@mail.gmail.com>
Date: Thu, 27 Oct 2016 09:03:17 -0400
From: David Windsor <dwindsor@...il.com>
To: kernel-hardening@...ts.openwall.com
Cc: Kees Cook <keescook@...omium.org>, "Reshetova, Elena" <elena.reshetova@...el.com>, 
	Hans Liljestrand <ishkamiel@...il.com>
Subject: Re: [RFC v2 PATCH 00/13] HARDENED_ATOMIC

On Thu, Oct 27, 2016 at 8:59 AM, David Windsor <dwindsor@...il.com> wrote:
> Hi Hans,
>
> <snip>
>
>>>Now we are left with local_wrap_t problem still... But it doesn’t concern arm I think at all.
>>
>> Ok, we managed to address this today finally hopefully in a non-ugly way. At least we are kind of happy with it.
>> So, from our side what we do today/tomorrow with Hans:
>>
>> - finalize coverage on atomic64 and local wrap functions
>
> Just a general question: in your efforts to expand coverage (not just
> with atomic64, but in general), are you adding _wrap() versions for
> functions that have existing kernel users, or are you creating, in
> some cases, both the _wrap() and protected versions of functions?
>
>> - add missing tests for atomic64 and local
>> - rebase on top of latest linux-next
>> - compile test and test run the whole thing in different combinations
>> - send rfcv3 with also all atomic maintainers included for wider blame/feedback
>>
>> Does it sound like a good plan for everyone?
>>

Actually, it doesn't look like I've updated
Documentation/security/hardened-atomic.txt yet.  I need to fix the
language explaining the x86 race condition to make it clear that we're
discussing the SMP case.

I also want to add a sentence somewhere (either in your cover letter
or in the kernel documentation, or both), referencing the benchmark
results and lack of demonstrable performance degradation.

>> Best Regards,
>> Elena.
>>

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