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 | |