linux-kernel - Re: [PATCH] mm: Remove HARDENED_USERCOPY

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Date:   Tue, 21 Sep 2021 12:01:12 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Stephen Kitt <steve@....org>
Cc:     Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        James Morris <jmorris@...ei.org>,
        "Serge E . Hallyn" <serge@...lyn.com>, linux-mm@...ck.org,
        linux-security-module@...r.kernel.org,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] mm: Remove HARDENED_USERCOPY_FALLBACK

On Tue, Sep 21, 2021 at 08:11:49AM +0200, Stephen Kitt wrote:
> This has served its purpose and is no longer used. All usercopy
> violations appear to have been handled by now, any remaining
> instances (or new bugs) will cause copies to be rejected.
> 
> This isn't a direct revert of commit 2d891fbc3bb6 ("usercopy: Allow
> strict enforcement of whitelists"); since usercopy_fallback is
> effectively 0, the fallback handling is removed too.
> 
> This also removes the usercopy_fallback module parameter on
> slab_common.
> 
> Link: https://github.com/KSPP/linux/issues/153
> Signed-off-by: Stephen Kitt <steve@....org>
> Suggested-by: Kees Cook <keescook@...omium.org>

Thanks for doing this!

Acked-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook