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Date: Fri, 8 Jul 2016 11:20:47 -0500 (CDT)
From: Christoph Lameter <cl@linux.com>
Subject: Re: [kernel-hardening] Re: [PATCH 9/9] mm: SLUB hardened usercopy
 support
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To: Kees Cook <keescook@chromium.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>, "kernel-hardening@lists.openwall.com" <kernel-hardening@lists.openwall.com>, Jan Kara <jack@suse.cz>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Linux-MM <linux-mm@kvack.org>, sparclinux <sparclinux@vger.kernel.org>, linux-ia64@vger.kernel.org, Andrea Arcangeli <aarcange@redhat.com>, linux-arch <linux-arch@vger.kernel.org>, "x86@kernel.org" <x86@kernel.org>, Russell King <linux@armlinux.org.uk>, PaX Team <pageexec@freemail.hu>, Borislav Petkov <bp@suse.de>, lin <ux-arm-kernel@lists.infradead.org>, 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>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Dmitry Vyukov <dvyukov@google.com>, Laura Abbott <labbott@fedoraproject.org>, Brad Spengler <spender@grsecurity.net>, Ard Biesheuvel <ard.biesheuvel@linaro.org>, LKML <linux-kernel@vger.kernel.org>, Pekka Enberg <penberg@kernel.org>, Case y Schauf ler <casey@schaufler-ca.com>, Andrew Morton <akpm@linux-foundation.org>, "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>, "David S. Miller" <davem@davemloft.net>

On Fri, 8 Jul 2016, Kees Cook wrote:

> Is check_valid_pointer() making sure the pointer is within the usable
> size? It seemed like it was checking that it was within the slub
> object (checks against s->size, wants it above base after moving
> pointer to include redzone, etc).

check_valid_pointer verifies that a pointer is pointing to the start of an
object. It is used to verify the internal points that SLUB used and
should not be modified to do anything different.

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