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From: Kees Cook <keescook@chromium.org>
Date: Wed, 20 Jul 2016 10:44:43 -0700
Message-ID: <CAGXu5jKk=1QzO8op-3aaPJ9HtceFsSNWwof--eb+wSi1UPnMUQ@mail.gmail.com>
Subject: Re: [PATCH v3 00/11] mm: Hardened usercopy
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To: David Laight <David.Laight@aculab.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, Jan Kara <jack@suse.cz>, "kernel-hardening@lists.openwall.com" <kernel-hardening@lists.openwall.com>, Will Deacon <will.deacon@arm.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>, "sparclinux@vger.kernel.org" <sparclinux@vger.kernel.org>, "linux-ia64@vger.kernel.org" <linux-ia64@vger.kernel.org>, Christoph Lameter <cl@linux.com>, Andrea Arcangeli <aarcange@redhat.com>, "linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>, "x86@kernel.org" <x86@kernel.org>, Russell King <linux@armlinux.org.uk>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, Catalin Marinas <catalin.marinas@arm.com>, PaX Team <pageexec@freemail.hu>, Borislav Petkov <bp@suse.de>, Mathias Krause <minipli@googlemail.com>, Fenghua Yu <fenghua.yu@intel.com>, Rik van Riel <riel@redhat.com>, David Rientjes <rientjes@google.com>, Tony Luck <tony.luck@intel.com>, Andy Lutomirski <luto@kernel.org>, Josh Poimboeuf <jpoimboe@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, Dmitry Vyukov <dvyukov@google.com>, Laura Abbott <labbott@fedoraproject.org>, Brad Spengler <spender@grsecurity.net>, Ard Biesheuvel <ard.biesheuvel@linaro.org>, Pekka Enberg <penberg@kernel.org>, Daniel Micay <danielmicay@gmail.com>, Casey Schaufler <casey@schaufler-ca.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>, "David S. Miller" <davem@davemloft.net>

On Wed, Jul 20, 2016 at 9:02 AM, David Laight <David.Laight@aculab.com> wrote:
> From: Kees Cook
>> Sent: 20 July 2016 16:32
> ...
>> Yup: that's exactly what it's doing: walking up the stack. :)
>
> Remind me to make sure all our customers run kernels with it disabled.

What's your concern with stack walking?

-Kees

-- 
Kees Cook
Chrome OS & Brillo Security

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