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Date: Tue, 18 Feb 2020 16:08:13 -0800
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Will Deacon <will@...nel.org>, Catalin Marinas <catalin.marinas@....com>, 
	Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu <mhiramat@...nel.org>, 
	Ard Biesheuvel <ard.biesheuvel@...aro.org>, Mark Rutland <mark.rutland@....com>, james.morse@....com
Cc: Dave Martin <Dave.Martin@....com>, Kees Cook <keescook@...omium.org>, 
	Laura Abbott <labbott@...hat.com>, Marc Zyngier <maz@...nel.org>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, Jann Horn <jannh@...gle.com>, 
	Miguel Ojeda <miguel.ojeda.sandonis@...il.com>, 
	Masahiro Yamada <yamada.masahiro@...ionext.com>, clang-built-linux@...glegroups.com, 
	kernel-hardening@...ts.openwall.com, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, Sami Tolvanen <samitolvanen@...gle.com>
Subject: [PATCH v8 08/12] arm64: vdso: disable Shadow Call Stack

Shadow stacks are only available in the kernel, so disable SCS
instrumentation for the vDSO.

Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Mark Rutland <mark.rutland@....com>
Acked-by: Will Deacon <will@...nel.org>
---
 arch/arm64/kernel/vdso/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile
index dd2514bb1511..a87a4f11724e 100644
--- a/arch/arm64/kernel/vdso/Makefile
+++ b/arch/arm64/kernel/vdso/Makefile
@@ -25,7 +25,7 @@ ccflags-y += -DDISABLE_BRANCH_PROFILING
 
 VDSO_LDFLAGS := -Bsymbolic
 
-CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os
+CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS)
 KBUILD_CFLAGS			+= $(DISABLE_LTO)
 KASAN_SANITIZE			:= n
 UBSAN_SANITIZE			:= n
-- 
2.25.0.265.gbab2e86ba0-goog

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