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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788/* SPDX-License-Identifier: GPL-2.0 *//* * Clang Control Flow Integrity (CFI) support. * * Copyright (C) 2022 Google LLC */#ifndef _LINUX_CFI_H#define _LINUX_CFI_H
#include <linux/bug.h>#include <linux/module.h>#include <linux/uaccess.h>#include <asm/cfi.h>
#ifdef CONFIG_CFIextern bool cfi_warn;
enum bug_trap_type report_cfi_failure(struct pt_regs *regs, unsigned long addr, unsigned long *target, u32 type);
static inline enum bug_trap_type report_cfi_failure_noaddr(struct pt_regs *regs, unsigned long addr){ return report_cfi_failure(regs, addr, NULL, 0);}
#ifndef cfi_get_offset/* * Returns the CFI prefix offset. By default, the compiler emits only * a 4-byte CFI type hash before the function. If an architecture * uses -fpatchable-function-entry=N,M where M>0 to change the prefix * offset, they must override this function. */static inline int cfi_get_offset(void){ return 4;}#endif
#ifndef cfi_get_func_hashstatic inline u32 cfi_get_func_hash(void *func){ u32 hash;
if (get_kernel_nofault(hash, func - cfi_get_offset())) return 0;
return hash;}#endif
/* CFI type hashes for BPF function types */extern u32 cfi_bpf_hash;extern u32 cfi_bpf_subprog_hash;
#else /* CONFIG_CFI */
static inline int cfi_get_offset(void) { return 0; }static inline u32 cfi_get_func_hash(void *func) { return 0; }
#define cfi_bpf_hash 0U#define cfi_bpf_subprog_hash 0U
#endif /* CONFIG_CFI */
#ifdef CONFIG_ARCH_USES_CFI_TRAPSbool is_cfi_trap(unsigned long addr);#elsestatic inline bool is_cfi_trap(unsigned long addr) { return false; }#endif
#ifdef CONFIG_MODULES#ifdef CONFIG_ARCH_USES_CFI_TRAPSvoid module_cfi_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, struct module *mod);#elsestatic inline void module_cfi_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, struct module *mod) {}#endif /* CONFIG_ARCH_USES_CFI_TRAPS */#endif /* CONFIG_MODULES */
#ifndef CFI_NOSEAL#define CFI_NOSEAL(x)#endif
#endif /* _LINUX_CFI_H */