ARM: Select ARCH_USES_CFI_GENERIC_LLVM_PASS

Prior to clang 22.0.0 [1], ARM did not have an architecture specific
kCFI bundle lowering in the backend, which may cause issues. Select
CONFIG_ARCH_USES_CFI_GENERIC_LLVM_PASS to enable use of __nocfi_generic.

Link: https://github.com/llvm/llvm-project/commit/d130f402642fba3d065aacb506cb061c899558de
Link: https://github.com/ClangBuiltLinux/linux/issues/2124
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Link: https://patch.msgid.link/20251025-idpf-fix-arm-kcfi-build-error-v1-2-ec57221153ae@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 2e3f93b690f47e0825ea677de35d9991ddebdf16..4fb985b76e97f72bc83726a20d674869727f55bb 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -44,6 +44,8 @@ config ARM
        select ARCH_USE_BUILTIN_BSWAP
        select ARCH_USE_CMPXCHG_LOCKREF
        select ARCH_USE_MEMTEST
+       # https://github.com/llvm/llvm-project/commit/d130f402642fba3d065aacb506cb061c899558de
+       select ARCH_USES_CFI_GENERIC_LLVM_PASS if CLANG_VERSION < 220000
        select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
        select ARCH_WANT_GENERAL_HUGETLB
        select ARCH_WANT_IPC_PARSE_VERSION