From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1753749AbcHPVL1 (ORCPT <rfc822;w@1wt.eu>);
	Tue, 16 Aug 2016 17:11:27 -0400
Received: from mail-pf0-f173.google.com ([209.85.192.173]:35101 "EHLO
	mail-pf0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1753669AbcHPVLX (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Tue, 16 Aug 2016 17:11:23 -0400
From: Kees Cook <keescook@chromium.org>
To: "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Kees Cook <keescook@chromium.org>, Stephen Boyd <sboyd@codeaurora.org>,
        Daniel Micay <danielmicay@gmail.com>, Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Josh Triplett <josh@joshtriplett.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Lai Jiangshan <jiangshanlai@gmail.com>,
        Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>,
        Tejun Heo <tj@kernel.org>, Michael Ellerman <mpe@ellerman.id.au>,
        "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Dan Williams <dan.j.williams@intel.com>, Jan Kara <jack@suse.cz>,
        Josef Bacik <jbacik@fb.com>, Thomas Gleixner <tglx@linutronix.de>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Nikolay Aleksandrov <nikolay@cumulusnetworks.com>,
        Dmitry Vyukov <dvyukov@google.com>, linux-kernel@vger.kernel.org,
        kernel-hardening@lists.openwall.com
Subject: [PATCH 0/5] bug: Provide toggle for BUG on data corruption
Date: Tue, 16 Aug 2016 14:11:00 -0700
Message-Id: <1471381865-25724-1-git-send-email-keescook@chromium.org>
X-Mailer: git-send-email 2.7.4
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

This adds a CONFIG to trigger BUG()s when the kernel encounters
unexpected data structure integrity as currently detected with
CONFIG_DEBUG_LIST, CONFIG_DEBUG_SPINLOCK, and with workqueues.

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.

Along with the patches is a new lkdtm test to validate that setting
CONFIG_DEBUG_LIST actually does what is desired.

Thanks,

-Kees