From: Kees Cook <kees@kernel.org>
To: Nathan Chancellor <nathan@kernel.org>
Cc: Kees Cook <kees@kernel.org>,
Nick Desaulniers <nick.desaulniers+lkml@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
"Gustavo A. R. Silva" <gustavoars@kernel.org>,
Paul Moore <paul@paul-moore.com>,
James Morris <jmorris@namei.org>,
"Serge E. Hallyn" <serge@hallyn.com>,
Nick Desaulniers <ndesaulniers@google.com>,
Bill Wendling <morbo@google.com>,
Justin Stitt <justinstitt@google.com>,
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 [thread overview]
Message-ID: <20250308042929.1753543-1-kees@kernel.org> (raw)
In-Reply-To: <20250308041950.it.402-kees@kernel.org>
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 <kees@kernel.org>
---
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <nick.desaulniers+lkml@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: x86@kernel.org
Cc: "H. Peter Anvin" <hpa@zytor.com>
---
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)
--
2.34.1
next prev parent reply other threads:[~2025-03-08 4:29 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-08 4:29 [PATCH v2 0/2] hardening: Enable i386 FORTIFY_SOURCE on Clang 16+ Kees Cook
2025-03-08 4:29 ` Kees Cook [this message]
2025-03-08 8:26 ` [PATCH v2 1/2] x86/build: Remove -ffreestanding on i386 with GCC Ingo Molnar
2025-03-08 9:17 ` Nathan Chancellor
2025-03-08 17:23 ` Kees Cook
2025-03-08 4:29 ` [PATCH v2 2/2] hardening: Enable i386 FORTIFY_SOURCE on Clang 16+ Kees Cook
2025-03-08 9:19 ` Nathan Chancellor
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