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 23 #ifdef CONFIG_ARCH_USES_CFI_TRAPS 24 bool is_cfi_trap(unsigned long addr); 25 #endif 26 #endif /* CONFIG_CFI_CLANG */ 27 28 #ifdef CONFIG_MODULES 29 #ifdef CONFIG_ARCH_USES_CFI_TRAPS 30 void module_cfi_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, 31 struct module *mod); 32 #else 33 static inline void module_cfi_finalize(const Elf_Ehdr *hdr, 34 const Elf_Shdr *sechdrs, 35 struct module *mod) {} 36 #endif /* CONFIG_ARCH_USES_CFI_TRAPS */ 37 #endif /* CONFIG_MODULES */ 38 39 #endif /* _LINUX_CFI_H */ 40