From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 15D5ACA0FE7 for ; Mon, 25 Aug 2025 15:16:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=tCbPolS6ar1c697qy2cUBoBdguHF3OuN6GwQQbjdKPI=; b=ABMJ3YnzsOhihCUAl/c/O/suMK kuc7nR35YtQaXSrORZUEXXQsPNtECFNDZNeuk7C1KFGNhrJwFr9IRLV9wEqrjVBDD0RalAcZOW4ga Z8wpIPi9/yZLfOhaP0J5B7O+FmA0tLqkSXU+68k6FTPKhCaiGDUXjnco8Y5wdEw6D1JbAKENUuBvJ svPV4DEgeGYEVYRgyxtFrpoi5N4lEI38leG18NlPfNen99zVfPDvOISchNhqEhu/rWrMUeJFOBevF uUKlLCuOKC5a9hbIHuK4iQ478AMh59W8Kup7ujdzbAx6E9VLsSKZyjCJCv4CWXPapV+OikNLdUIws vNiosdTg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uqYvz-00000008Tm5-0pXE; Mon, 25 Aug 2025 15:16:35 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uqY96-00000008FOa-33BR; Mon, 25 Aug 2025 14:26:04 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id DCA8E6023B; Mon, 25 Aug 2025 14:26:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 78AA6C4CEED; Mon, 25 Aug 2025 14:26:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1756131963; bh=wgWu+8XypexFEPIMyZ5cUv+a841NNieT1SYM+X0Qx/k=; h=From:To:Cc:Subject:Date:From; b=qhtif550k7UP88ylX7mXFhF3o1Ewy/94q+uBREqP5wwVj4p5tKWo4YIYxqabfCm7o RXbpoE5lUS9A4eX6olO0JQHJX7II7zucifIUT4t5oGSDjVm5tEUvNG7nDTaTagf8MC jr7RemyFaL1wlR9Kr70Sg2zVepCA8TRpRF4n178+y1/WeWFAYnDer2xVGz5oBJ0Lzm 0uYOJ+IQmCdVYQdGABtrzKO32BebHlOxGDRRKOqu8JezSkNdHqIcMoMGgLe2oVQ2xq QdjlzNO81fwO8SDSNET5/Yoj4vn7Gds6gMmBMfvGySNCf4krhzhfmv4KmE2sfHEjQA zncS7Q1vVyi0w== From: Kees Cook To: Peter Zijlstra Cc: Kees Cook , Sami Tolvanen , David Woodhouse , Linus Walleij , Mark Rutland , Puranjay Mohan , Jonathan Corbet , Nathan Chancellor , x86@kernel.org, linux-doc@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, llvm@lists.linux.dev, linux-hardening@vger.kernel.org Subject: [PATCH 0/5] kcfi: Prepare for GCC support Date: Mon, 25 Aug 2025 07:25:47 -0700 Message-Id: <20250825141316.work.967-kees@kernel.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, With KCFI support in GCC coming[1], we need to make some (relatively small) changes in the kernel to deal with it: - move __nocfi out of compilers-clang.h (so GCC can see it too) - add cfi=debug so future Kees can find breakage easier - remove problematic __noinitretpoline usage - rename CONFIG_CFI_CLANG to CONFIG_CFI (otherwise is it quite confusing) Thanks! -Kees [1] https://lore.kernel.org/linux-hardening/20250821064202.work.893-kees@kernel.org/ Kees Cook (5): compiler_types.h: Move __nocfi out of compiler-specific header x86/traps: Clarify KCFI instruction layout x86/cfi: Add option for cfi=debug bootparam x86/cfi: Remove __noinitretpoline and __noretpoline kcfi: Rename CONFIG_CFI_CLANG to CONFIG_CFI arch/Kconfig | 22 +++++----- arch/arm/Kconfig | 2 +- arch/arm64/Kconfig | 4 +- arch/riscv/Kconfig | 6 +-- arch/x86/Kconfig | 12 +++--- init/Kconfig | 4 +- kernel/module/Kconfig | 2 +- lib/Kconfig.debug | 2 +- Makefile | 2 +- arch/arm/mm/Makefile | 2 +- arch/riscv/kernel/Makefile | 2 +- arch/riscv/purgatory/Makefile | 2 +- arch/x86/kernel/Makefile | 2 +- arch/x86/purgatory/Makefile | 2 +- kernel/Makefile | 2 +- .../admin-guide/kernel-parameters.txt | 18 ++++++++ arch/riscv/include/asm/cfi.h | 4 +- arch/x86/include/asm/cfi.h | 4 +- include/asm-generic/vmlinux.lds.h | 2 +- include/linux/cfi.h | 6 +-- include/linux/cfi_types.h | 8 ++-- include/linux/compiler-clang.h | 5 --- include/linux/compiler-gcc.h | 4 -- include/linux/compiler.h | 2 +- include/linux/compiler_types.h | 4 +- include/linux/init.h | 8 ---- tools/include/linux/cfi_types.h | 6 +-- tools/perf/util/include/linux/linkage.h | 2 +- arch/arm/mm/cache-fa.S | 2 +- arch/arm/mm/cache-v4.S | 2 +- arch/arm/mm/cache-v4wb.S | 4 +- arch/arm/mm/cache-v4wt.S | 2 +- arch/arm/mm/cache-v6.S | 2 +- arch/arm/mm/cache-v7.S | 2 +- arch/arm/mm/cache-v7m.S | 2 +- arch/arm/mm/proc-arm1020.S | 2 +- arch/arm/mm/proc-arm1020e.S | 2 +- arch/arm/mm/proc-arm1022.S | 2 +- arch/arm/mm/proc-arm1026.S | 2 +- arch/arm/mm/proc-arm920.S | 2 +- arch/arm/mm/proc-arm922.S | 2 +- arch/arm/mm/proc-arm925.S | 2 +- arch/arm/mm/proc-arm926.S | 2 +- arch/arm/mm/proc-arm940.S | 2 +- arch/arm/mm/proc-arm946.S | 2 +- arch/arm/mm/proc-feroceon.S | 2 +- arch/arm/mm/proc-mohawk.S | 2 +- arch/arm/mm/proc-xsc3.S | 2 +- arch/arm/mm/tlb-v4.S | 2 +- arch/arm/kernel/hw_breakpoint.c | 2 +- arch/arm64/kernel/debug-monitors.c | 2 +- arch/arm64/kernel/traps.c | 4 +- arch/arm64/kvm/handle_exit.c | 2 +- arch/arm64/net/bpf_jit_comp.c | 2 +- arch/riscv/net/bpf_jit_comp64.c | 4 +- arch/x86/kernel/alternative.c | 43 +++++++++++++++---- arch/x86/kernel/cfi.c | 2 +- arch/x86/kernel/kprobes/core.c | 2 +- drivers/misc/lkdtm/cfi.c | 2 +- kernel/module/tree_lookup.c | 2 +- kernel/configs/hardening.config | 2 +- 61 files changed, 141 insertions(+), 113 deletions(-) -- 2.34.1