linux-kernel - Re: [kernel-hardening] [PATCH 00/23] Hardened usercopy whitelisting

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Date:   Tue, 20 Jun 2017 15:41:13 -0400
From:   Rik van Riel <riel@...hat.com>
To:     Kees Cook <keescook@...omium.org>,
        kernel-hardening@...ts.openwall.com
Cc:     David Windsor <dave@...lcore.net>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [kernel-hardening] [PATCH 00/23] Hardened usercopy whitelisting

On Mon, 2017-06-19 at 16:36 -0700, Kees Cook wrote:
> This series is modified from Brad Spengler/PaX Team's PAX_USERCOPY
> code
> in the last public patch of grsecurity/PaX based on our understanding
> of the code. Changes or omissions from the original code are ours and
> don't reflect the original grsecurity/PaX code.
> 
> David Windsor did the bulk of the porting, refactoring, splitting,
> testing, etc; I just did some extra tweaks, hunk moving, and small
> extra patches.
> 
> 
> This updates the slab allocator to add annotations (useroffset and
> usersize) to define allowed usercopy regions.

This is a great improvement over the old system
of having a few whitelisted kmalloc caches, and
bounce buffering to copy data from caches that
are not whitelisted!

I like it.

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