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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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f1befc82ad
Instead of duplicating the same code for each architecture, move the CFI type hash variables for BPF function types and related helper functions to generic CFI code, and allow architectures to override the function definitions if needed. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Link: https://lore.kernel.org/r/20250801001004.1859976-7-samitolvanen@google.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
87 lines
2.0 KiB
C
87 lines
2.0 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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#ifdef CONFIG_CFI_CLANG
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extern bool cfi_warn;
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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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#ifndef cfi_get_offset
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/*
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* Returns the CFI prefix offset. By default, the compiler emits only
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* a 4-byte CFI type hash before the function. If an architecture
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* uses -fpatchable-function-entry=N,M where M>0 to change the prefix
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* offset, they must override this function.
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*/
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static inline int cfi_get_offset(void)
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{
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return 4;
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}
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#endif
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#ifndef cfi_get_func_hash
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static inline u32 cfi_get_func_hash(void *func)
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{
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u32 hash;
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if (get_kernel_nofault(hash, func - cfi_get_offset()))
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return 0;
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return hash;
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}
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#endif
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/* CFI type hashes for BPF function types */
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extern u32 cfi_bpf_hash;
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extern u32 cfi_bpf_subprog_hash;
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#else /* CONFIG_CFI_CLANG */
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static inline int cfi_get_offset(void) { return 0; }
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static inline u32 cfi_get_func_hash(void *func) { return 0; }
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#define cfi_bpf_hash 0U
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#define cfi_bpf_subprog_hash 0U
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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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