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Date: Tue, 21 Jun 2016 11:40:16 -0700
From: Kees Cook <>
To: Emese Revfy <>
Cc: "" <>, PaX Team <>, 
	Brad Spengler <>, Michal Marek <>, 
	LKML <>, 
	Masahiro Yamada <>, linux-kbuild <>, 
	"Theodore Ts'o" <>, Andrew Morton <>, Linux-MM <>, 
	Jens Axboe <>, Al Viro <>, 
	Paul McKenney <>, Ingo Molnar <>, 
	Thomas Gleixner <>,, 
	"David S. Miller" <>
Subject: Re: [PATCH v4 0/4] Introduce the latent_entropy gcc plugin

On Mon, Jun 20, 2016 at 11:39 AM, Emese Revfy <> wrote:
> I would like to introduce the latent_entropy gcc plugin. This plugin
> mitigates the problem of the kernel having too little entropy during and
> after boot for generating crypto keys.
> This plugin mixes random values into the latent_entropy global variable
> in functions marked by the __latent_entropy attribute.
> The value of this global variable is added to the kernel entropy pool
> to increase the entropy.
> It is a CII project supported by the Linux Foundation.
> The latent_entropy plugin was ported from grsecurity/PaX originally written
> by the PaX Team. You can find more about the plugin here:
> The plugin supports all gcc version from 4.5 to 6.0.
> I do some changes above the PaX version. The important one is mixing
> the stack pointer into the global variable too.
> You can find more about the changes here:
> This patch set is based on the "Introduce GCC plugin infrastructure"
> patch set (git/mmarek/kbuild.git#kbuild HEAD: 543c37cb165049c3be).
> Emese Revfy (4):
>  Add support for passing gcc plugin arguments
>  Add the latent_entropy gcc plugin
>  Mark functions with the latent_entropy attribute
>  Add the extra_latent_entropy kernel parameter

Thanks! This looks good to me. I've adjusted some of the commit
message language for clarity and fixed a few other >80 lines that
stood out to me.

I've applied this to for-next/kspp and after I finish local build
testing, it should appear in linux-next.

Yay! :)


Kees Cook
Chrome OS & Brillo Security

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