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Date: Fri, 15 Jul 2016 12:05:50 +1000
From: Balbir Singh <bsingharora@...il.com>
To: Kees Cook <keescook@...omium.org>
Cc: linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>,
Casey Schaufler <casey@...aufler-ca.com>,
PaX Team <pageexec@...email.hu>,
Brad Spengler <spender@...ecurity.net>,
Russell King <linux@...linux.org.uk>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Michael Ellerman <mpe@...erman.id.au>,
Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
"David S. Miller" <davem@...emloft.net>, x86@...nel.org,
Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
Andy Lutomirski <luto@...nel.org>, Borislav Petkov <bp@...e.de>,
Mathias Krause <minipli@...glemail.com>, Jan Kara <jack@...e.cz>,
Vitaly Wool <vitalywool@...il.com>,
Andrea Arcangeli <aarcange@...hat.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Laura Abbott <labbott@...oraproject.org>,
linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org, sparclinux@...r.kernel.org,
linux-arch@...r.kernel.org, linux-mm@...ck.org,
kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH v2 11/11] mm: SLUB hardened usercopy support
On Wed, Jul 13, 2016 at 02:56:04PM -0700, Kees Cook wrote:
> Under CONFIG_HARDENED_USERCOPY, this adds object size checking to the
> SLUB allocator to catch any copies that may span objects. Includes a
> redzone handling fix from Michael Ellerman.
>
> Based on code from PaX and grsecurity.
>
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
> init/Kconfig | 1 +
> mm/slub.c | 36 ++++++++++++++++++++++++++++++++++++
> 2 files changed, 37 insertions(+)
>
> diff --git a/init/Kconfig b/init/Kconfig
> index 798c2020ee7c..1c4711819dfd 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -1765,6 +1765,7 @@ config SLAB
>
> config SLUB
> bool "SLUB (Unqueued Allocator)"
> + select HAVE_HARDENED_USERCOPY_ALLOCATOR
Should this patch come in earlier from a build perspective? I think
patch 1 introduces and uses __check_heap_object.
Balbir Singh.
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