linux-kernel - Re: [kernel-hardening] Re: [PATCH 9/9] mm: SLUB hardened usercopy support

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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>, Jan Kara <jack@...e.cz>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Linux-MM <linux-mm@...ck.org>,
	sparclinux <sparclinux@...r.kernel.org>,
	linux-ia64@...r.kernel.org, Andrea Arcangeli <aarcange@...hat.com>,
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	"x86@...nel.org" <x86@...nel.org>,
	Russell King <linux@...linux.org.uk>,
	PaX Team <pageexec@...email.hu>, Borislav Petkov <bp@...e.de>,
	lin <ux-arm-kernel@...ts.infradead.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: [kernel-hardening] 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.