linux-hardening - [PATCH v3 16/16] x86, build: Allow CONFIG_CFI

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Message-Id: <20210914191045.2234020-17-samitolvanen@google.com>
Date:   Tue, 14 Sep 2021 12:10:45 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     x86@...nel.org
Cc:     Kees Cook <keescook@...omium.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: [PATCH v3 16/16] x86, build: Allow CONFIG_CFI_CLANG to be selected

Select ARCH_SUPPORTS_CFI_CLANG to allow CFI to be enabled with
Clang >= 13.

Link: https://bugs.llvm.org/show_bug.cgi?id=51588
Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
---
 arch/x86/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 4e001bbbb425..0df0285d3ed4 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -107,6 +107,7 @@ config X86
 	select ARCH_SUPPORTS_KMAP_LOCAL_FORCE_MAP	if NR_CPUS <= 4096
 	select ARCH_SUPPORTS_LTO_CLANG
 	select ARCH_SUPPORTS_LTO_CLANG_THIN
+	select ARCH_SUPPORTS_CFI_CLANG		if X86_64 && CLANG_VERSION >= 130000
 	select ARCH_USE_BUILTIN_BSWAP
 	select ARCH_USE_MEMTEST
 	select ARCH_USE_QUEUED_RWLOCKS
-- 
2.33.0.309.g3052b89438-goog