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Date: Fri, 8 Jul 2016 11:20:47 -0500 (CDT)
From: Christoph Lameter <cl@...ux.com>
To: Kees Cook <keescook@...omium.org>
cc: Michael Ellerman <mpe@...erman.id.au>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>,
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sparclinux <sparclinux@...r.kernel.org>, linux-ia64@...r.kernel.org,
Andrea Arcangeli <aarcange@...hat.com>,
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LKML <linux-kernel@...r.kernel.org>, Pekka Enberg <penberg@...nel.org>,
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Andrew Morton <akpm@...ux-foundation.org>,
"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
"David S. Miller" <davem@...emloft.net>
Subject: Re: Re: [PATCH 9/9] mm: SLUB hardened usercopy
support
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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