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#include <asm/cfi.h> 13 14#ifndef cfi_get_offset 15static inline int cfi_get_offset(void) 16{ 17 return 0; 18} 19#endif 20 21#ifdef CONFIG_CFI_CLANG 22enum bug_trap_type report_cfi_failure(struct pt_regs *regs, unsigned long addr, 23 unsigned long *target, u32 type); 24 25static inline enum bug_trap_type report_cfi_failure_noaddr(struct pt_regs *regs, 26 unsigned long addr) 27{ 28 return report_cfi_failure(regs, addr, NULL, 0); 29} 30#endif /* CONFIG_CFI_CLANG */ 31 32#ifdef CONFIG_ARCH_USES_CFI_TRAPS 33bool is_cfi_trap(unsigned long addr); 34#else 35static inline bool is_cfi_trap(unsigned long addr) { return false; } 36#endif 37 38#ifdef CONFIG_MODULES 39#ifdef CONFIG_ARCH_USES_CFI_TRAPS 40void module_cfi_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, 41 struct module *mod); 42#else 43static inline void module_cfi_finalize(const Elf_Ehdr *hdr, 44 const Elf_Shdr *sechdrs, 45 struct module *mod) {} 46#endif /* CONFIG_ARCH_USES_CFI_TRAPS */ 47#endif /* CONFIG_MODULES */ 48 49#ifndef CFI_NOSEAL 50#define CFI_NOSEAL(x) 51#endif 52 53#endif /* _LINUX_CFI_H */ 54