linux-kernel - [PATCH] kbuild: Allow LTO to be selected with KASAN_HW

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Message-Id: <20210308184656.1914947-1-samitolvanen@google.com>
Date:   Mon,  8 Mar 2021 10:46:56 -0800
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        Kees Cook <keescook@...omium.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Alistair Delva <adelva@...gle.com>
Subject: [PATCH] kbuild: Allow LTO to be selected with KASAN_HW_TAGS

While LTO with KASAN is normally not useful, hardware tag-based KASAN
can be used also in production kernels with ARM64_MTE. Therefore, allow
KASAN_HW_TAGS to be selected together with HAS_LTO_CLANG.

Reported-by: Alistair Delva <adelva@...gle.com>
Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
---
 arch/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index 2bb30673d8e6..2e7139b39e8f 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -638,7 +638,7 @@ config HAS_LTO_CLANG
 	depends on $(success,$(AR) --help | head -n 1 | grep -qi llvm)
 	depends on ARCH_SUPPORTS_LTO_CLANG
 	depends on !FTRACE_MCOUNT_USE_RECORDMCOUNT
-	depends on !KASAN
+	depends on !KASAN || KASAN_HW_TAGS
 	depends on !GCOV_KERNEL
 	help
 	  The compiler and Kconfig options support building with Clang's

base-commit: 144c79ef33536b4ecb4951e07dbc1f2b7fa99d32
-- 
2.30.1.766.gb4fecdf3b7-goog