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Date: Tue, 27 Feb 2018 16:45:32 +0530
From: P J P <ppandit@...hat.com>
To: kernel-hardening@...ts.openwall.com
Cc: Florian Weimer <fweimer@...hat.com>,
P J P <pjp@...oraproject.org>
Subject: [PATCH 1/1] Add an option to build kernel with -finit-local-vars
From: P J P <pjp@...oraproject.org>
Add a configuration option to build kernel with -finit-local-vars
compiler option.[*] It'll zero initialize the automatic kernel
function variables, thus helping to reduce kernel information
leakage issues.
[*] https://gcc.gnu.org/ml/gcc-patches/2014-06/msg00615.html
Signed-off-by: P J P <pjp@...oraproject.org>
---
Makefile | 4 ++++
lib/Kconfig.debug | 8 ++++++++
2 files changed, 12 insertions(+)
diff --git a/Makefile b/Makefile
index 659a7780aeb3..7b25a77470ca 100644
--- a/Makefile
+++ b/Makefile
@@ -781,6 +781,10 @@ KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
$(call cc-option,-fno-var-tracking)
endif
+ifdef CONFIG_FINIT_LOCAL_VARS
+KBUILD_CFLAGS += $(call cc-option, -finit-local-vars)
+endif
+
ifdef CONFIG_FUNCTION_TRACER
ifndef CC_FLAGS_FTRACE
CC_FLAGS_FTRACE := -pg
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 64155e310a9f..8da18d145c5b 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -206,6 +206,14 @@ config ENABLE_WARN_DEPRECATED
Disable this to suppress the "warning: 'foo' is deprecated
(declared at kernel/power/somefile.c:1234)" messages.
+config FINIT_LOCAL_VARS
+ bool "Enable -finit-local-vars"
+ default n
+ help
+ Enable the -finit-local-vars compiler option during the kernel build.
+ It'll zero initialise the automatic kernel function variables, thus
+ helping to reduce kernel information leakage issues.
+
config ENABLE_MUST_CHECK
bool "Enable __must_check logic"
default y
--
2.14.3
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