linux-kernel - Re: [PATCH v2] usercopy: remove page-spanning test for now

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Date:   Wed, 07 Sep 2016 14:29:46 -0400
From:   Rik van Riel <riel@...hat.com>
To:     Kees Cook <keescook@...omium.org>,
        Thomas Hellstrom <thellstrom@...are.com>
Cc:     Laura Abbott <labbott@...hat.com>,
        VMware Graphics <linux-graphics-maintainer@...are.com>,
        Sinclair Yeh <syeh@...are.com>,
        Vinson Lee <vlee@...edesktop.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Andy Lutomirski <luto@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] usercopy: remove page-spanning test for now

On Wed, 2016-09-07 at 11:08 -0700, Kees Cook wrote:
> A custom allocator without __GFP_COMP that copies to userspace has
> been
> found in vmw_execbuf_process[1], so this disables the page-span
> checker
> by placing it behind a CONFIG for future work where such things can
> be
> tracked down later.
> 
> [1] https://bugzilla.redhat.com/show_bug.cgi?id=1373326
> 
> Reported-by: Vinson Lee <vlee@...edesktop.org>
> Fixes: f5509cc18daa ("mm: Hardened usercopy")
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Rik van Riel <riel@...hat.com>

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