linux-kernel - [PATCH AUTOSEL 4.19 157/209] s390/kasan: avoid instrumentation of early C code

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Message-Id: <20191113015025.9685-157-sashal@kernel.org>
Date:   Tue, 12 Nov 2019 20:49:33 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Vasily Gorbik <gor@...ux.ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Sasha Levin <sashal@...nel.org>, linux-s390@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 157/209] s390/kasan: avoid instrumentation of early C code

From: Vasily Gorbik <gor@...ux.ibm.com>

[ Upstream commit 0a9b40911baffac6fc9cc2d88e893585870a97f7 ]

Instrumented C code cannot run without the kasan shadow area. Exempt
source code files from kasan which are running before / used during
kasan initialization.

Reviewed-by: Martin Schwidefsky <schwidefsky@...ibm.com>
Signed-off-by: Vasily Gorbik <gor@...ux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/s390/boot/Makefile            | 1 +
 arch/s390/boot/compressed/Makefile | 1 +
 arch/s390/kernel/Makefile          | 2 ++
 drivers/s390/char/Makefile         | 1 +
 4 files changed, 5 insertions(+)

diff --git a/arch/s390/boot/Makefile b/arch/s390/boot/Makefile
index 9e6668ee93de8..f6a9b0c203553 100644
--- a/arch/s390/boot/Makefile
+++ b/arch/s390/boot/Makefile
@@ -6,6 +6,7 @@
 KCOV_INSTRUMENT := n
 GCOV_PROFILE := n
 UBSAN_SANITIZE := n
+KASAN_SANITIZE := n
 
 KBUILD_AFLAGS := $(KBUILD_AFLAGS_DECOMPRESSOR)
 KBUILD_CFLAGS := $(KBUILD_CFLAGS_DECOMPRESSOR)
diff --git a/arch/s390/boot/compressed/Makefile b/arch/s390/boot/compressed/Makefile
index b375c6c5ae7b1..9b3d821e5b46e 100644
--- a/arch/s390/boot/compressed/Makefile
+++ b/arch/s390/boot/compressed/Makefile
@@ -8,6 +8,7 @@
 KCOV_INSTRUMENT := n
 GCOV_PROFILE := n
 UBSAN_SANITIZE := n
+KASAN_SANITIZE := n
 
 obj-y	:= $(if $(CONFIG_KERNEL_UNCOMPRESSED),,head.o misc.o) piggy.o
 targets	:= vmlinux.lds vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index b205c0ff0b220..762fc45376ffd 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -23,6 +23,8 @@ KCOV_INSTRUMENT_early_nobss.o	:= n
 UBSAN_SANITIZE_early.o		:= n
 UBSAN_SANITIZE_early_nobss.o	:= n
 
+KASAN_SANITIZE_early_nobss.o	:= n
+
 #
 # Passing null pointers is ok for smp code, since we access the lowcore here.
 #
diff --git a/drivers/s390/char/Makefile b/drivers/s390/char/Makefile
index c6ab34f94b1b5..3072b89785ddf 100644
--- a/drivers/s390/char/Makefile
+++ b/drivers/s390/char/Makefile
@@ -11,6 +11,7 @@ endif
 GCOV_PROFILE_sclp_early_core.o		:= n
 KCOV_INSTRUMENT_sclp_early_core.o	:= n
 UBSAN_SANITIZE_sclp_early_core.o	:= n
+KASAN_SANITIZE_sclp_early_core.o	:= n
 
 CFLAGS_sclp_early_core.o		+= -D__NO_FORTIFY
 
-- 
2.20.1