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
report_cfi_failure_noaddr(struct pt_regs * regs,unsigned long addr)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
is_cfi_trap(unsigned long addr)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
module_cfi_finalize(const Elf_Ehdr * hdr,const Elf_Shdr * sechdrs,struct module * mod)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