linux-kernel - [PATCH 4/6] bug: Enable DEBUG_SG under BUG_ON_DATA

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Date:   Mon,  6 Mar 2017 11:09:44 -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 4/6] bug: Enable DEBUG_SG under BUG_ON_DATA_CORRUPTION

Similar to CONFIG_DEBUG_CREDENTIALS, CONFIG_DEBUG_SG already handles
calling BUG, and performs inexpensive checks. This enables it under
CONFIG_BUG_ON_DATA_CORRUPTION.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
 lib/Kconfig.debug | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 009d6f8c7e5a..42c61cfe7d19 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1267,7 +1267,7 @@ config DEBUG_PI_LIST
 
 config DEBUG_SG
 	bool "Debug SG table operations"
-	depends on DEBUG_KERNEL
+	depends on DEBUG_KERNEL || BUG_ON_DATA_CORRUPTION
 	help
 	  Enable this to turn on checks on scatter-gather tables. This can
 	  help find problems with drivers that do not properly initialize
@@ -1995,6 +1995,7 @@ config BUG_ON_DATA_CORRUPTION
 	bool "Trigger a BUG when data corruption is detected"
 	select DEBUG_CREDENTIALS
 	select DEBUG_LIST
+	select DEBUG_SG
 	help
 	  This option enables several inexpensive data corruption checks.
 	  Most of these checks normally just WARN and try to further avoid
-- 
2.7.4