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Date: Thu, 18 Aug 2016 13:42:55 -0400
From: Rik van Riel <riel@...hat.com>
To: kernel-hardening@...ts.openwall.com,
"Paul E . McKenney"
<paulmck@...ux.vnet.ibm.com>
Cc: Kees Cook <keescook@...omium.org>, Laura Abbott <labbott@...hat.com>,
Steven Rostedt <rostedt@...dmis.org>,
Daniel Micay <danielmicay@...il.com>, Joe Perches <joe@...ches.com>,
Stephen Boyd <sboyd@...eaurora.org>,
Syed
Rameez Mustafa <rameezmustafa@...eaurora.org>,
Arnd Bergmann
<arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Josh
Triplett <josh@...htriplett.org>,
Mathieu Desnoyers
<mathieu.desnoyers@...icios.com>,
Lai Jiangshan <jiangshanlai@...il.com>,
"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
"Kirill A. Shutemov"
<kirill.shutemov@...ux.intel.com>,
Michael Ellerman <mpe@...erman.id.au>,
Andrew Morton <akpm@...ux-foundation.org>,
Dan Williams
<dan.j.williams@...el.com>, Jan Kara <jack@...e.cz>,
Thomas Gleixner
<tglx@...utronix.de>, Josef Bacik <jbacik@...com>,
Ingo Molnar
<mingo@...nel.org>, Tejun Heo <tj@...nel.org>,
Andrey Ryabinin
<aryabinin@...tuozzo.com>,
Nikolay Aleksandrov
<nikolay@...ulusnetworks.com>,
Dmitry Vyukov <dvyukov@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/5] bug: Provide toggle for BUG
on data corruption
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.
>
> 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.)
>
> This is mostly a refactoring of similar code from PaX and Grsecurity,
> along with MSM kernel changes by Syed Rameez Mustafa.
>
> Along with the patches is a new lkdtm test to validate that setting
> CONFIG_DEBUG_LIST actually does what is desired.
>
Series looks good to me, too.
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