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8e8ae78896
During module loading, check if a callback function used by the alternatives specified in the '.altinstruction' ELF section (if present) is located in core kernel .text. If not fail module loading before callback is called. Reported-by: Fanqin Cui <cuifq1@chinatelecom.cn> Closes: https://lore.kernel.org/all/20250807072700.348514-1-fanqincui@163.com/ Signed-off-by: Adrian Barnaś <abarnas@google.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> [will: Folded in 'noinstr' tweak from Mark] Signed-off-by: Will Deacon <will@kernel.org>
42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_ALTERNATIVE_H
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#define __ASM_ALTERNATIVE_H
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#include <asm/alternative-macros.h>
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#ifndef __ASSEMBLY__
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/stddef.h>
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struct alt_instr {
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s32 orig_offset; /* offset to original instruction */
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s32 alt_offset; /* offset to replacement instruction */
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u16 cpucap; /* cpucap bit set for replacement */
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u8 orig_len; /* size of original instruction(s) */
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u8 alt_len; /* size of new instruction(s), <= orig_len */
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};
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typedef void (*alternative_cb_t)(struct alt_instr *alt,
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__le32 *origptr, __le32 *updptr, int nr_inst);
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void __init apply_boot_alternatives(void);
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void __init apply_alternatives_all(void);
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bool alternative_is_applied(u16 cpucap);
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#ifdef CONFIG_MODULES
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int apply_alternatives_module(void *start, size_t length);
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#else
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static inline int apply_alternatives_module(void *start, size_t length)
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{
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return 0;
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}
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#endif
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void alt_cb_patch_nops(struct alt_instr *alt, __le32 *origptr,
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__le32 *updptr, int nr_inst);
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_ALTERNATIVE_H */
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