linux-kernel - [PATCH 1/6] bug: Clarify help text for BUG_ON_DATA

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Date:   Mon,  6 Mar 2017 11:09:41 -0800
From:   Kees Cook <keescook@...omium.org>
To:     kernel-hardening@...ts.openwall.com
Cc:     Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Rik van Riel <riel@...hat.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Olof Johansson <olof@...om.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/6] bug: Clarify help text for BUG_ON_DATA_CORRUPTION

This expands on the Kconfig help text for CONFIG_BUG_ON_DATA_CORRUPTION.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
 lib/Kconfig.debug | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 97d62c2da6c2..4a73d46711fb 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1995,9 +1995,11 @@ config BUG_ON_DATA_CORRUPTION
 	bool "Trigger a BUG when data corruption is detected"
 	select DEBUG_LIST
 	help
-	  Select this option if the kernel should BUG when it encounters
-	  data corruption in kernel memory structures when they get checked
-	  for validity.
+	  This option enables several inexpensive data corruption checks.
+	  Most of these checks normally just WARN and try to further avoid
+	  the corruption. Selecting this option upgrades these to BUGs, so
+	  that a system owner can furhter configure the system for immediate
+	  reboots or crash dumps.
 
 	  If unsure, say N.
 
-- 
2.7.4