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Message-ID: <1471542175.2581.22.camel@redhat.com>
Subject: Re: [kernel-hardening] [PATCH v3 0/5] bug: Provide toggle for BUG
 on data corruption
From: Rik van Riel <riel@redhat.com>
To: kernel-hardening@lists.openwall.com,
        "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>
Cc: 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
Date: Thu, 18 Aug 2016 13:42:55 -0400
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References: <1471470132-29499-1-git-send-email-keescook@chromium.org>
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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.