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Date: Tue, 17 Nov 2015 09:30:21 -0800
From: Kees Cook <>
To: "" <>
Subject: Re: 

On Tue, Nov 17, 2015 at 12:09 AM, Daniel Micay <> wrote:
>> AOSP isn't enough, and even if people did submit them there, I would
>> be one of the AOSP reviewers asking that they be upstreamed instead.
>> ;)
> Sure, but it's a way to proving to upstream that the features are useful
> and work well. For example, lets say x86 Android adopted the
> segmentation-based KERNEXEC/UDEREF. Lets say it actually shipped in the
> next version of Android. I am pretty sure Linus would change his
> attitude towards it. You're not going to convince him by words rather
> than actions though. Not that improving Linux on a dying architecture
> should be the priority, but it's a good example.

Right, that's absolutely a potential path to keep open. It's
effectively what happened to things like Binder. Each piece is going
to be a little different. UDEREF is (politically still) a hard sell on
x86, but arm now has CONFIG_CPU_SW_DOMAIN_PAN that covers a fair bit
of non-LPAE-arm UDEREF. (I await spender's flames now...)

So, the more we split out and test, the better. :)


Kees Cook
Chrome OS Security

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