cfi.h
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Clang Control Flow Integrity (CFI) support.
*
* Copyright (C) 2019 Google LLC
*/
#ifndef _LINUX_CFI_H
#define _LINUX_CFI_H
#ifdef CONFIG_CFI_CLANG
typedef void (*cfi_check_fn)(uint64_t id, void *ptr, void *diag);
/* Compiler-generated function in each module, and the kernel */
extern void __cfi_check(uint64_t id, void *ptr, void *diag);
/*
* Force the compiler to generate a CFI jump table entry for a function
* and store the jump table address to __cfi_jt_<function>.
*/
#define __CFI_ADDRESSABLE(fn) \
const void* __cfi_jt_ ## fn __visible = (void *)&fn;
#ifdef CONFIG_CFI_CLANG_SHADOW
extern void cfi_module_add(struct module *mod, unsigned long base_addr);
extern void cfi_module_remove(struct module *mod, unsigned long base_addr);
#else
static inline void cfi_module_add(struct module *mod, unsigned long base_addr) {}
static inline void cfi_module_remove(struct module *mod, unsigned long base_addr) {}
#endif /* CONFIG_CFI_CLANG_SHADOW */
#else /* !CONFIG_CFI_CLANG */
#define __CFI_ADDRESSABLE(fn)
#endif /* CONFIG_CFI_CLANG */
#endif /* _LINUX_CFI_H */