linux-kernel - [PATCH v2 0/2] hardening: Enable i386 FORTIFY

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Message-Id: <20250308041950.it.402-kees@kernel.org>
Date: Fri,  7 Mar 2025 20:29:24 -0800
From: Kees Cook <kees@...nel.org>
To: Nathan Chancellor <nathan@...nel.org>
Cc: Kees Cook <kees@...nel.org>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Paul Moore <paul@...l-moore.com>,
	James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	linux-kernel@...r.kernel.org,
	x86@...nel.org,
	linux-hardening@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: [PATCH v2 0/2] hardening: Enable i386 FORTIFY_SOURCE on Clang 16+

Hi,

This drops -ffreestanding for i386 unconditionally for GCC, and on
Clang version 16 and later. FORTIFY_SOURCE depends on the libcall
optimizations made without -ffreestanding on Clang. On GCC, there is no
expected differences. With that done, it's possible to gain Clang
FORTIFY_SOURCE coverage on i386 again, though only for Clang 16+.

-Kees


 v1: https://lore.kernel.org/lkml/20250303214929.work.499-kees@kernel.org/
 v2: drop -ffreestanding (Nathan)

Kees Cook (2):
  x86/build: Remove -ffreestanding on i386 with GCC
  hardening: Enable i386 FORTIFY_SOURCE on Clang 16+

 arch/x86/Makefile          | 2 ++
 security/Kconfig.hardening | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

-- 
2.34.1