From patchwork Sat Mar 8 04:29:25 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kees Cook X-Patchwork-Id: 14007415 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 D77B415E5DC; Sat, 8 Mar 2025 04:29:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741408174; cv=none; b=eu3TepZ4+iwo9Sp2r3TPOUNcUgYjs8eM0NmyJOsUr69wZt+KFDWNM3AtIcfXvqkfJn7vt/OpzbXJVcUrrGjWgSquoHmO4rTfpqWWAcdQWuhlM46dKTASLVdwVAzfWdIJRGUI/BJm+ehRSTG7e7KtIXdGjtx8CqZ741HJ8j3JbmE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741408174; c=relaxed/simple; bh=2rqH2K/hmkSvy+fVXnqW3mEp/SoP0RjzdMEFR3wRgbw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=D9cuHrgvWkWyx00drhknvrWTvgXRWGgfQ8XElPZCaRAfNChjZ4YEcdPxkUk2W+2HSyCXNg2mqKs0D04TfueBKKLhZjgccAZVFKU7i+iATY8yUCVdd3kzaCScyoWvEI90Fnf2QnE6PBdkSJxC+ikoYXG4sx+LWKeZ+Eu2Bc2/UQI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PLH2a0tE; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PLH2a0tE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 53F41C4CEE5; Sat, 8 Mar 2025 04:29:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741408173; bh=2rqH2K/hmkSvy+fVXnqW3mEp/SoP0RjzdMEFR3wRgbw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PLH2a0tEdc28zkjtOIxCWf3+GeirEF1iVaJ83u6VfTTzZuOM+a1n+VIQZCD5iV0y/ vkYY8QncAmR524V2J6km/6iG2QkXtMg7Oyil32TTr+FxrZDrcujJfqBfB6JkE+stQl HPx5GDrssaFXRHOaBIfKPApnYDqu4l/5mc4AMeUHwhch+2QcCueiG377UTu2Qjp+3v k4IFQaXLmJIfblfYmYwc9lGAExLwOtPjoOgDcFA7rM8/20pWXNXcGxtiEltEh22q1C E1lJAKSZPWEr0cKUXmtxkRyOJMmr+yFl9lZ3mcVbAuJoFIXu7wLk4pOXOqfNYsLlfp WR4CSuQhPC/2Q== From: Kees Cook To: Nathan Chancellor Cc: Kees Cook , Nick Desaulniers , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , "Gustavo A. R. Silva" , Paul Moore , James Morris , "Serge E. Hallyn" , Nick Desaulniers , Bill Wendling , Justin Stitt , linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, linux-security-module@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH v2 1/2] x86/build: Remove -ffreestanding on i386 with GCC Date: Fri, 7 Mar 2025 20:29:25 -0800 Message-Id: <20250308042929.1753543-1-kees@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250308041950.it.402-kees@kernel.org> References: <20250308041950.it.402-kees@kernel.org> Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1122; i=kees@kernel.org; h=from:subject; bh=2rqH2K/hmkSvy+fVXnqW3mEp/SoP0RjzdMEFR3wRgbw=; b=owGbwMvMwCVmps19z/KJym7G02pJDOmnjy+V5O47o2FU8XX65qqSrWU5SRdykvd/yFdnmdbFf GwFG592RykLgxgXg6yYIkuQnXuci8fb9nD3uYowc1iZQIYwcHEKwERKdRl+sy3v2lnLecugkE82 qPyDK6OU9BPvf2cPyhhmG76/mBx+juF/suCtqrPMHdr5lzuPSE2O2LOv4vrzgl0nDmhvsvDgDyp gAwA= X-Developer-Key: i=kees@kernel.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 The use of -ffreestanding is a leftover that is only needed for certain versions of Clang. Adjust this to be Clang-only. A later patch will make this a versioned check. Signed-off-by: Kees Cook Acked-by: Ingo Molnar Reviewed-by: Nathan Chancellor --- Cc: Nathan Chancellor Cc: Nick Desaulniers Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: x86@kernel.org Cc: "H. Peter Anvin" --- arch/x86/Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 5b773b34768d..d25ed25fb7d9 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -137,8 +137,10 @@ ifeq ($(CONFIG_X86_32),y) include $(srctree)/arch/x86/Makefile_32.cpu KBUILD_CFLAGS += $(cflags-y) + ifeq ($(CONFIG_CC_IS_CLANG),y) # temporary until string.h is fixed KBUILD_CFLAGS += -ffreestanding + endif ifeq ($(CONFIG_STACKPROTECTOR),y) ifeq ($(CONFIG_SMP),y)