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Message-Id: <20250825141316.work.967-kees@kernel.org> Date: Mon, 25 Aug 2025 07:25:47 -0700 From: Kees Cook <kees@...nel.org> To: Peter Zijlstra <peterz@...radead.org> Cc: Kees Cook <kees@...nel.org>, Sami Tolvanen <samitolvanen@...gle.com>, David Woodhouse <dwmw2@...radead.org>, Linus Walleij <linus.walleij@...aro.org>, Mark Rutland <mark.rutland@....com>, Puranjay Mohan <puranjay@...nel.org>, Jonathan Corbet <corbet@....net>, Nathan Chancellor <nathan@...nel.org>, x86@...nel.org, linux-doc@...r.kernel.org, linux-kbuild@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-riscv@...ts.infradead.org, llvm@...ts.linux.dev, linux-hardening@...r.kernel.org Subject: [PATCH 0/5] kcfi: Prepare for GCC support 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
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