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![Peter Zijlstra](/assets/img/avatar_default.png)
Since the references to the module init/exit points only have external references, a module LTO run will consider them 'unused' and seal them, leading to an immediate fail on module load. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Link: https://lore.kernel.org/r/20220308154319.113767246@infradead.org
50 lines
1.3 KiB
C
50 lines
1.3 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) 2021 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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#ifdef CONFIG_CFI_CLANG
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typedef void (*cfi_check_fn)(uint64_t id, void *ptr, void *diag);
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/* Compiler-generated function in each module, and the kernel */
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extern void __cfi_check(uint64_t id, void *ptr, void *diag);
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/*
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* Force the compiler to generate a CFI jump table entry for a function
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* and store the jump table address to __cfi_jt_<function>.
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*/
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#define __CFI_ADDRESSABLE(fn, __attr) \
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const void *__cfi_jt_ ## fn __visible __attr = (void *)&fn
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#ifdef CONFIG_CFI_CLANG_SHADOW
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extern void cfi_module_add(struct module *mod, unsigned long base_addr);
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extern void cfi_module_remove(struct module *mod, unsigned long base_addr);
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#else
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static inline void cfi_module_add(struct module *mod, unsigned long base_addr) {}
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static inline void cfi_module_remove(struct module *mod, unsigned long base_addr) {}
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#endif /* CONFIG_CFI_CLANG_SHADOW */
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#else /* !CONFIG_CFI_CLANG */
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#ifdef CONFIG_X86_KERNEL_IBT
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#define __CFI_ADDRESSABLE(fn, __attr) \
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const void *__cfi_jt_ ## fn __visible __attr = (void *)&fn
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#endif /* CONFIG_X86_KERNEL_IBT */
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#endif /* CONFIG_CFI_CLANG */
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#ifndef __CFI_ADDRESSABLE
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#define __CFI_ADDRESSABLE(fn, __attr)
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#endif
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#endif /* _LINUX_CFI_H */
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