1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Clang Control Flow Integrity (CFI) support. 4 * 5 * Copyright (C) 2022 Google LLC 6 */ 7 #ifndef _LINUX_CFI_H 8 #define _LINUX_CFI_H 9 10 #include <linux/bug.h> 11 #include <linux/module.h> 12 13 #ifdef CONFIG_CFI_CLANG 14 enum bug_trap_type report_cfi_failure(struct pt_regs *regs, unsigned long addr, 15 unsigned long *target, u32 type); 16 17 static inline enum bug_trap_type report_cfi_failure_noaddr(struct pt_regs *regs, 18 unsigned long addr) 19 { 20 return report_cfi_failure(regs, addr, NULL, 0); 21 } 22 #endif /* CONFIG_CFI_CLANG */ 23 24 #ifdef CONFIG_ARCH_USES_CFI_TRAPS 25 bool is_cfi_trap(unsigned long addr); 26 #else 27 static inline bool is_cfi_trap(unsigned long addr) { return false; } 28 #endif 29 30 #ifdef CONFIG_MODULES 31 #ifdef CONFIG_ARCH_USES_CFI_TRAPS 32 void module_cfi_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, 33 struct module *mod); 34 #else 35 static inline void module_cfi_finalize(const Elf_Ehdr *hdr, 36 const Elf_Shdr *sechdrs, 37 struct module *mod) {} 38 #endif /* CONFIG_ARCH_USES_CFI_TRAPS */ 39 #endif /* CONFIG_MODULES */ 40 41 #endif /* _LINUX_CFI_H */ 42