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