54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Clang Control Flow Integrity (CFI) support.
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*
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* Copyright (C) 2022 Google LLC
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*/
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#ifndef _LINUX_CFI_H
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#define _LINUX_CFI_H
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#include <linux/bug.h>
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#include <linux/module.h>
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#include <asm/cfi.h>
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#ifndef cfi_get_offset
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static inline int cfi_get_offset(void)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_CFI_CLANG
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enum bug_trap_type report_cfi_failure(struct pt_regs *regs, unsigned long addr,
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unsigned long *target, u32 type);
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static inline enum bug_trap_type report_cfi_failure_noaddr(struct pt_regs *regs,
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unsigned long addr)
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{
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return report_cfi_failure(regs, addr, NULL, 0);
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}
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#endif /* CONFIG_CFI_CLANG */
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#ifdef CONFIG_ARCH_USES_CFI_TRAPS
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bool is_cfi_trap(unsigned long addr);
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#else
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static inline bool is_cfi_trap(unsigned long addr) { return false; }
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#endif
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#ifdef CONFIG_MODULES
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#ifdef CONFIG_ARCH_USES_CFI_TRAPS
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void module_cfi_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
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struct module *mod);
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#else
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static inline void module_cfi_finalize(const Elf_Ehdr *hdr,
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const Elf_Shdr *sechdrs,
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struct module *mod) {}
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#endif /* CONFIG_ARCH_USES_CFI_TRAPS */
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#endif /* CONFIG_MODULES */
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#ifndef CFI_NOSEAL
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#define CFI_NOSEAL(x)
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#endif
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#endif /* _LINUX_CFI_H */
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