54 lines
1.0 KiB
C
54 lines
1.0 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_ARM_KFENCE_H
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#define __ASM_ARM_KFENCE_H
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#include <linux/kfence.h>
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#include <asm/pgalloc.h>
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#include <asm/set_memory.h>
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static inline int split_pmd_page(pmd_t *pmd, unsigned long addr)
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{
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int i;
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unsigned long pfn = PFN_DOWN(__pa(addr));
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pte_t *pte = pte_alloc_one_kernel(&init_mm);
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if (!pte)
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return -ENOMEM;
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for (i = 0; i < PTRS_PER_PTE; i++)
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set_pte_ext(pte + i, pfn_pte(pfn + i, PAGE_KERNEL), 0);
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pmd_populate_kernel(&init_mm, pmd, pte);
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flush_tlb_kernel_range(addr, addr + PMD_SIZE);
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return 0;
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}
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static inline bool arch_kfence_init_pool(void)
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{
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unsigned long addr;
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pmd_t *pmd;
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for (addr = (unsigned long)__kfence_pool; is_kfence_address((void *)addr);
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addr += PAGE_SIZE) {
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pmd = pmd_off_k(addr);
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if (pmd_leaf(*pmd)) {
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if (split_pmd_page(pmd, addr & PMD_MASK))
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return false;
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}
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}
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return true;
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}
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static inline bool kfence_protect_page(unsigned long addr, bool protect)
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{
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set_memory_valid(addr, 1, !protect);
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return true;
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}
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#endif /* __ASM_ARM_KFENCE_H */
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