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Message-Id: <20200416161245.148813-13-samitolvanen@google.com>
Date: Thu, 16 Apr 2020 09:12:45 -0700
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>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>, Mark Rutland <mark.rutland@....com>,
Masahiro Yamada <masahiroy@...nel.org>, Michal Marek <michal.lkml@...kovi.net>,
Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
Juri Lelli <juri.lelli@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>
Cc: Dave Martin <Dave.Martin@....com>, Kees Cook <keescook@...omium.org>,
Laura Abbott <labbott@...hat.com>, Marc Zyngier <maz@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>,
Jann Horn <jannh@...gle.com>, Miguel Ojeda <miguel.ojeda.sandonis@...il.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>, Ard Biesheuvel <ardb@...nel.org>
Subject: [PATCH v11 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>
Reviewed-by: Kees Cook <keescook@...omium.org>
Acked-by: Ard Biesheuvel <ardb@...nel.org>
---
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 094eabdecfe6..b52ae8c29560 100644
--- a/drivers/firmware/efi/libstub/Makefile
+++ b/drivers/firmware/efi/libstub/Makefile
@@ -32,6 +32,9 @@ 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
--
2.26.1.301.g55bc3eb7cb9-goog
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