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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 167/220] s390/kasan: avoid vdso instrumentation
Date:   Fri, 22 Nov 2019 11:28:52 +0100
Message-Id: <20191122100924.813862210@linuxfoundation.org>
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From: Vasily Gorbik <gor@linux.ibm.com>

[ Upstream commit 348498458505e202df41b6b9a78da448d39298b7 ]

vdso is mapped into user space processes, which won't have kasan
shodow mapped.

Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/s390/kernel/vdso32/Makefile | 3 ++-
 arch/s390/kernel/vdso64/Makefile | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/s390/kernel/vdso32/Makefile b/arch/s390/kernel/vdso32/Makefile
index 04dd3e2c3bd9b..e76309fbbcb3b 100644
--- a/arch/s390/kernel/vdso32/Makefile
+++ b/arch/s390/kernel/vdso32/Makefile
@@ -28,9 +28,10 @@ obj-y += vdso32_wrapper.o
 extra-y += vdso32.lds
 CPPFLAGS_vdso32.lds += -P -C -U$(ARCH)
 
-# Disable gcov profiling and ubsan for VDSO code
+# Disable gcov profiling, ubsan and kasan for VDSO code
 GCOV_PROFILE := n
 UBSAN_SANITIZE := n
+KASAN_SANITIZE := n
 
 # Force dependency (incbin is bad)
 $(obj)/vdso32_wrapper.o : $(obj)/vdso32.so
diff --git a/arch/s390/kernel/vdso64/Makefile b/arch/s390/kernel/vdso64/Makefile
index ddebc26cd9494..f849ac61c5da0 100644
--- a/arch/s390/kernel/vdso64/Makefile
+++ b/arch/s390/kernel/vdso64/Makefile
@@ -28,9 +28,10 @@ obj-y += vdso64_wrapper.o
 extra-y += vdso64.lds
 CPPFLAGS_vdso64.lds += -P -C -U$(ARCH)
 
-# Disable gcov profiling and ubsan for VDSO code
+# Disable gcov profiling, ubsan and kasan for VDSO code
 GCOV_PROFILE := n
 UBSAN_SANITIZE := n
+KASAN_SANITIZE := n
 
 # Force dependency (incbin is bad)
 $(obj)/vdso64_wrapper.o : $(obj)/vdso64.so
-- 
2.20.1