linux-kernel - Re: [PATCH v2 0/5] bug: Provide toggle for BUG on data corruption

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Message-ID: <CAGXu5jKEkn5Z2L1UjweSeAxA9RuYL0cdNrRo1J1KCQxD3WG5ZA@mail.gmail.com>
Date:	Wed, 17 Aug 2016 14:11:28 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Stephen Boyd <sboyd@...eaurora.org>,
	Syed Rameez Mustafa <rameezmustafa@...eaurora.org>
Cc:	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Laura Abbott <labbott@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Daniel Micay <danielmicay@...il.com>,
	Joe Perches <joe@...ches.com>, 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>,
	Dan Williams <dan.j.williams@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Josef Bacik <jbacik@...com>,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	Tejun Heo <tj@...nel.org>,
	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH v2 0/5] bug: Provide toggle for BUG on data corruption

On Wed, Aug 17, 2016 at 1:17 PM, Stephen Boyd <sboyd@...eaurora.org> wrote:
> On 08/16, Kees Cook wrote:
>> This adds a CONFIG 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 Stephen Boyd.
>
> Which commit in the MSM kernel from me? I wonder if perhaps
> you're thinking of a patch from Syed Rameez Mustafa like commit
> 1c014f321e6d67f47 in the msm-3.4 kernel.

Ooof. I can't read. Yes, you were the committer, not the author! Whoops!

https://android.googlesource.com/kernel/msm/+/7b49b86d3aa3d0c6400454a346bad1bbdf0cc78f%5E%21/#F0

I will adjust the changelog. Thanks!

-Kees

-- 
Kees Cook
Nexus Security