From patchwork Sat Mar 8 04:29:24 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kees Cook X-Patchwork-Id: 14007416 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 1AD88176242; 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=Tby4mnFJYLhlPeI5f5gqVUoI2QMii8+/8QcONEX9Z8tcVoX2f9t/cEIQnjZu4K7QvUBGUB4AtFSnCicFrqdzdA0R4IbDWJfnD6YWtBbjHZL/pl3kCCNix65KvafwwxKfG7ghOUiKsBcUCIvLVIkBCKgwrq6vZnwaN3WkLhlp2bc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741408174; c=relaxed/simple; bh=50xuBK936/wlpPFLBa/DZAV+OQctfO5sy1dUe1kY/nY=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=mlb63N4OnxnVbqaHm+Xfdxj1Kw59H1ouTk+c9gmx4w2uRDY1rVIgj7J7JpFnf3rUoxTNhahqrzk6xVWdKHnaTkYgQF5kDX68kqNmS72BxKFG49Ni3gnKT6J97WLPXB8ZCYIHQ3xrQvrw9r0p7ruoE4ILcQ411ZooZBCCm0raQ7o= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=HJvja/Tc; 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="HJvja/Tc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5CB07C4CEE4; 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=50xuBK936/wlpPFLBa/DZAV+OQctfO5sy1dUe1kY/nY=; h=From:To:Cc:Subject:Date:From; b=HJvja/TcQtSS/G0OcBcsF/crh/AsJZYRWkHIXyRCcDesGcWcKKpg2J78Fe8McjthK f1umCp4/ZDAUnjIsx+WW7/7K8stI4pmNaKjLuCUN9+q0xzvvrC7Z7/TnonP245NA5B XmEhRECzElWBE+dRhTfP1EbczYC16juHp291f34b4yhmDQd5jBuPhLI4/I/0KatNyT nvcZ6KkurpyBIvkISh8Eht1yI5bXU5nmRizqmj8ElcNpfb8TuBL2IDYTOvqL/yceBo oMO3XI8czMvjOve+ttb+UvP/YlphliKJw+7B0apUb7as8La4q4f8ZVVBg4osGi74ed wwh7wtu8b/4qQ== From: Kees Cook To: Nathan Chancellor Cc: Kees Cook , Nick Desaulniers , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "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, x86@kernel.org, linux-hardening@vger.kernel.org, linux-security-module@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH v2 0/2] hardening: Enable i386 FORTIFY_SOURCE on Clang 16+ Date: Fri, 7 Mar 2025 20:29:24 -0800 Message-Id: <20250308041950.it.402-kees@kernel.org> X-Mailer: git-send-email 2.34.1 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=737; i=kees@kernel.org; h=from:subject:message-id; bh=50xuBK936/wlpPFLBa/DZAV+OQctfO5sy1dUe1kY/nY=; b=owGbwMvMwCVmps19z/KJym7G02pJDOmnjy/9+GdOclH6d8efvedLtjkUsamJFFTMf/31j6gf3 /9jyxy0O0pZGMS4GGTFFFmC7NzjXDzetoe7z1WEmcPKBDKEgYtTACaSMIfhf/mia/OOpOuF+jLG 8Wsd9r1xJfJo5iQ+m8kvuvnW3pb/UcLwz3bSDubq42oTrt5V8LdTi2T1d+5LOSI4/faRK2ck207 sZQAA X-Developer-Key: i=kees@kernel.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 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(-)