From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EF6642566 for ; Tue, 18 Apr 2023 12:23:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CA6D4C4339B; Tue, 18 Apr 2023 12:23:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1681820637; bh=Pl7qe1hAnrP+LtVJ6K+2U2pcxRX/WcQvra5GGhz/u6E=; h=From:To:Cc:Subject:Date:From; b=ZV5ApDRAANpiHhaO421exFkJL+f9/cyKqYJDClXnFpP78N6NHpc5acuTMCnwrO5U+ yCTXwgMlGU294bLFzBnsTvW3IrY/19mThftD5ndrMlJF6WfhoILio9vlCt7Xtl3H3n yxin7yexwPHB8ClnOsuilIDEhl6Knw7pBX6Lxn3YKFksCb7LiI2zNV2oKJ3p7kXrzh dwCdXOKtbHDSI+YXtuQ2bxjqFmFODE550Wu4Imp9G7LCmBAXbmV4kExNEd5urcqEpn Tl3FCJUTPuqIFgPZhQWwitBhAmTa3+jTd6FZ3UCq5z8j/nO74a7RlVmBXr0WmgKjhn khRNdTpQgffaQ== From: Arnd Bergmann To: Masahiro Yamada , Marco Elver Cc: Arnd Bergmann , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Nathan Chancellor , Nick Desaulniers , Nicolas Schier , Tom Rix , Andrew Morton , "Peter Zijlstra (Intel)" , Michael Ellerman , kasan-dev@googlegroups.com, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH] [v2] kasan: remove hwasan-kernel-mem-intrinsic-prefix=1 for clang-14 Date: Tue, 18 Apr 2023 14:23:35 +0200 Message-Id: <20230418122350.1646391-1-arnd@kernel.org> X-Mailer: git-send-email 2.39.2 Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Arnd Bergmann Some unknown -mllvm options (i.e. those starting with the letter "h") don't cause an error to be returned by clang, so the cc-option helper adds the unknown hwasan-kernel-mem-intrinsic-prefix=1 flag to CFLAGS with compilers that are new enough for hwasan but too old for this option. This causes a rather unreadable build failure: fixdep: error opening file: scripts/mod/.empty.o.d: No such file or directory make[4]: *** [/home/arnd/arm-soc/scripts/Makefile.build:252: scripts/mod/empty.o] Error 2 fixdep: error opening file: scripts/mod/.devicetable-offsets.s.d: No such file or directory make[4]: *** [/home/arnd/arm-soc/scripts/Makefile.build:114: scripts/mod/devicetable-offsets.s] Error 2 Add a version check to only allow this option with clang-15, gcc-13 or later versions. Fixes: 51287dcb00cc ("kasan: emit different calls for instrumentable memintrinsics") Link: https://lore.kernel.org/all/CANpmjNMwYosrvqh4ogDO8rgn+SeDHM2b-shD21wTypm_6MMe=g@mail.gmail.com/ Signed-off-by: Arnd Bergmann --- v2: use one-line version check for both clang and gcc, clarify changelog text --- scripts/Makefile.kasan | 2 ++ 1 file changed, 2 insertions(+) diff --git a/scripts/Makefile.kasan b/scripts/Makefile.kasan index c186110ffa20..390658a2d5b7 100644 --- a/scripts/Makefile.kasan +++ b/scripts/Makefile.kasan @@ -69,7 +69,9 @@ CFLAGS_KASAN := -fsanitize=kernel-hwaddress \ $(instrumentation_flags) # Instrument memcpy/memset/memmove calls by using instrumented __hwasan_mem*(). +ifeq ($(call clang-min-version, 150000)$(call gcc-min-version, 130000),y) CFLAGS_KASAN += $(call cc-param,hwasan-kernel-mem-intrinsic-prefix=1) +endif endif # CONFIG_KASAN_SW_TAGS -- 2.39.2