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 |
15 | static inline int cfi_get_offset(void) |
16 | { |
17 | return 0; |
18 | } |
19 | #endif |
20 | |
21 | #ifdef CONFIG_CFI_CLANG |
22 | enum bug_trap_type report_cfi_failure(struct pt_regs *regs, unsigned long addr, |
23 | unsigned long *target, u32 type); |
24 | |
25 | static 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 |
33 | bool is_cfi_trap(unsigned long addr); |
34 | #else |
35 | static inline bool is_cfi_trap(unsigned long addr) { return false; } |
36 | #endif |
37 | |
38 | #ifdef CONFIG_MODULES |
39 | #ifdef CONFIG_ARCH_USES_CFI_TRAPS |
40 | void module_cfi_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, |
41 | struct module *mod); |
42 | #else |
43 | static 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 | |