linux-kernel - Re: [kernel-hardening] [PATCH v3 0/5] bug: Provide toggle for BUG on data corruption

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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: [kernel-hardening] [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.