From mboxrd@z Thu Jan  1 00:00:00 1970
Reply-To: kernel-hardening@lists.openwall.com
Date: Fri, 19 Aug 2016 10:46:20 -0700
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
References: <1471470132-29499-1-git-send-email-keescook@chromium.org>
 <1471575198.32433.75.camel@redhat.com>
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Message-Id: <20160819174620.GG3482@linux.vnet.ibm.com>
Subject: Re: [kernel-hardening] [PATCH v3 0/5] bug: Provide toggle for BUG on
 data corruption
To: Rik van Riel <riel@redhat.com>
Cc: kernel-hardening@lists.openwall.com, Kees Cook <keescook@chromium.org>, Laura Abbott <labbott@redhat.com>, Steven Rostedt <rostedt@goodmis.org>, Daniel Micay <danielmicay@gmail.com>, Joe Perches <joe@perches.com>, Stephen Boyd <sboyd@codeaurora.org>, Syed Rameez Mustafa <rameezmustafa@codeaurora.org>, Arnd Bergmann <arnd@arndb.de>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Josh Triplett <josh@joshtriplett.org>, Mathieu Desnoyers <mathieu.desnoyers@efficios.com>, Lai Jiangshan <jiangshanlai@gmail.com>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, Michael Ellerman <mpe@ellerman.id.au>, Andrew Morton <akpm@linux-foundation.org>, Dan Williams <dan.j.williams@intel.com>, Jan Kara <jack@suse.cz>, Thomas Gleixner <tglx@linutronix.de>, Josef Bacik <jbacik@fb.com>, Ingo Molnar <mingo@kernel.org>, Tejun Heo <tj@kernel.org>, Andrey Ryabinin <aryabinin@virtuozzo.com>, Nikolay Aleksandrov <nikolay@cumulusnetworks.com>, Dmitry Vyukov <dvyukov@google.com>, linux-kernel@vger.kernel.org
List-ID: <kernel-hardening.lists.openwall.com>

On Thu, Aug 18, 2016 at 10:53:18PM -0400, Rik van Riel wrote:
> On Thu, 2016-08-18 at 13:57 -0700, Paul E. McKenney wrote:
> > On Thu, Aug 18, 2016 at 01:42:55PM -0400, Rik van Riel wrote:
> > > On Wed, 2016-08-17 at 14:42 -0700, Kees Cook wrote:
> > > > This adds CONFIG_BUG_ON_DATA_CORRUPTION to trigger BUG()s when
> > > > the
> > > > kernel
> > > > encounters unexpected data structure integrity as currently
> > > > detected
> > > > with CONFIG_DEBUG_LIST.
> > > >=20
> > > > Specifically list operations have been a target for widening
> > > > flaws to
> > > > gain
> > > > "write anywhere" primitives for attackers, so this also
> > > > consolidates
> > > > the
> > > > debug checking to avoid code and check duplication (e.g. RCU list
> > > > debug
> > > > was missing a check that got added to regular list debug). It
> > > > also
> > > > stops
> > > > manipulations when corruption is detected, since worsening the
> > > > corruption
> > > > makes no sense. (Really, everyone should build with
> > > > CONFIG_DEBUG_LIST
> > > > since the checks are so inexpensive.)
> > > >=20
> > > > This is mostly a refactoring of similar code from PaX and
> > > > Grsecurity,
> > > > along with MSM kernel changes by Syed Rameez Mustafa.
> > > >=20
> > > > Along with the patches is a new lkdtm test to validate that
> > > > setting
> > > > CONFIG_DEBUG_LIST actually does what is desired.
> > >=20
> > > Series looks good to me, too.
> >=20
> > Reviewed-by?=C2=A0=C2=A0Acked-by?=C2=A0=C2=A0Ephemeral accolades?=C2=A0=
> =C2=A0;-)
> 
> Acked-by: Rik van Riel <riel@redhat.com>
> 
> works, but I saw you already committed the series to
> your tree, and was not sure you would add more reviews :)

Well, there is at least one more rebase for topic branches.  ;-)

							Thanx, Paul