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Message-Id: <20200225173933.74818-13-samitolvanen@google.com>
Date: Tue, 25 Feb 2020 09:39:33 -0800
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Will Deacon <will@...nel.org>, Catalin Marinas <catalin.marinas@....com>,
James Morse <james.morse@....com>, Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>, Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Mark Rutland <mark.rutland@....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 v9 12/12] efi/libstub: disable SCS
Shadow stacks are not available in the EFI stub, filter out SCS flags.
Suggested-by: James Morse <james.morse@....com>
Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
---
drivers/firmware/efi/libstub/Makefile | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
index 98a81576213d..ee5c37c401c9 100644
--- a/drivers/firmware/efi/libstub/Makefile
+++ b/drivers/firmware/efi/libstub/Makefile
@@ -30,6 +30,9 @@ KBUILD_CFLAGS := $(cflags-y) -DDISABLE_BRANCH_PROFILING \
$(call cc-option,-fno-stack-protector) \
-D__DISABLE_EXPORTS
+# remove SCS flags from all objects in this directory
+KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS))
+
GCOV_PROFILE := n
KASAN_SANITIZE := n
UBSAN_SANITIZE := n
--
2.25.0.265.gbab2e86ba0-goog
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