projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| cf68fffb ST |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | /* | |
| 3 | * Clang Control Flow Integrity (CFI) support. | |
| 4 | * | |
| 5 | * Copyright (C) 2021 Google LLC | |
| 6 | */ | |
| 7 | #ifndef _LINUX_CFI_H | |
| 8 | #define _LINUX_CFI_H | |
| 9 | ||
| 10 | #ifdef CONFIG_CFI_CLANG | |
| 11 | typedef void (*cfi_check_fn)(uint64_t id, void *ptr, void *diag); | |
| 12 | ||
| 13 | /* Compiler-generated function in each module, and the kernel */ | |
| 14 | extern void __cfi_check(uint64_t id, void *ptr, void *diag); | |
| 15 | ||
| 16 | /* | |
| 17 | * Force the compiler to generate a CFI jump table entry for a function | |
| 18 | * and store the jump table address to __cfi_jt_<function>. | |
| 19 | */ | |
| 20 | #define __CFI_ADDRESSABLE(fn, __attr) \ | |
| 21 | const void *__cfi_jt_ ## fn __visible __attr = (void *)&fn | |
| 22 | ||
| 23 | #ifdef CONFIG_CFI_CLANG_SHADOW | |
| 24 | ||
| 25 | extern void cfi_module_add(struct module *mod, unsigned long base_addr); | |
| 26 | extern void cfi_module_remove(struct module *mod, unsigned long base_addr); | |
| 27 | ||
| 28 | #else | |
| 29 | ||
| 30 | static inline void cfi_module_add(struct module *mod, unsigned long base_addr) {} | |
| 31 | static inline void cfi_module_remove(struct module *mod, unsigned long base_addr) {} | |
| 32 | ||
| 33 | #endif /* CONFIG_CFI_CLANG_SHADOW */ | |
| 34 | ||
| 35 | #else /* !CONFIG_CFI_CLANG */ | |
| 36 | ||
| cb9010f8 PZ |
37 | #ifdef CONFIG_X86_KERNEL_IBT |
| 38 | ||
| 39 | #define __CFI_ADDRESSABLE(fn, __attr) \ | |
| 40 | const void *__cfi_jt_ ## fn __visible __attr = (void *)&fn | |
| 41 | ||
| 42 | #endif /* CONFIG_X86_KERNEL_IBT */ | |
| cf68fffb ST |
43 | |
| 44 | #endif /* CONFIG_CFI_CLANG */ | |
| 45 | ||
| cb9010f8 PZ |
46 | #ifndef __CFI_ADDRESSABLE |
| 47 | #define __CFI_ADDRESSABLE(fn, __attr) | |
| 48 | #endif | |
| 49 | ||
| cf68fffb | 50 | #endif /* _LINUX_CFI_H */ |