1 files changed, 55 insertions, 0 deletions
diff --git a/include/linux/cfi.h b/include/linux/cfi.h
new file mode 100644
index 000000000000..1db17ecbb86c
--- /dev/null
+++ b/include/linux/cfi.h
@@ -0,0 +1,55 @@
+/* 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 <asm/cfi.h>
+
+extern bool cfi_warn;
+
+#ifndef cfi_get_offset
+static inline int cfi_get_offset(void)
+{
+	return 0;
+}
+#endif
+
+#ifdef CONFIG_CFI_CLANG
+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);
+}
+#endif /* CONFIG_CFI_CLANG */
+
+#ifdef CONFIG_ARCH_USES_CFI_TRAPS
+bool is_cfi_trap(unsigned long addr);
+#else
+static inline bool is_cfi_trap(unsigned long addr) { return false; }
+#endif
+
+#ifdef CONFIG_MODULES
+#ifdef CONFIG_ARCH_USES_CFI_TRAPS
+void module_cfi_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
+			 struct module *mod);
+#else
+static 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 */