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