// SPDX-License-Identifier: GPL-2.0 #define DISABLE_BRANCH_PROFILING #include <linux/kasan.h> #include <linux/memblock.h> #include <linux/hugetlb.h> #include <asm/pgalloc.h> static int __init kasan_init_shadow_8M(unsigned long k_start, unsigned long k_end, void *block) { pmd_t *pmd = pmd_off_k(k_start); unsigned long k_cur, k_next; for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd++, block += SZ_4M) { pte_t *ptep; int i; k_next = pgd_addr_end(k_cur, k_end); if ((void *)pmd_page_vaddr(*pmd) != kasan_early_shadow_pte) continue; ptep = memblock_alloc(PTE_FRAG_SIZE, PTE_FRAG_SIZE); if (!ptep) return -ENOMEM; for (i = 0; i < PTRS_PER_PTE; i++) { pte_t pte = pte_mkhuge(pfn_pte(PHYS_PFN(__pa(block + i * PAGE_SIZE)), PAGE_KERNEL)); __set_pte_at(&init_mm, k_cur, ptep + i, pte, 1); } pmd_populate_kernel(&init_mm, pmd, ptep); *pmd = __pmd(pmd_val(*pmd) | _PMD_PAGE_8M); } return 0; } int __init kasan_init_region(void *start, size_t size) { unsigned long k_start = (unsigned long)kasan_mem_to_shadow(start); unsigned long k_end = (unsigned long)kasan_mem_to_shadow(start + size); unsigned long k_cur; int ret; void *block; block = memblock_alloc(k_end - k_start, SZ_8M); if (!block) return -ENOMEM; if (IS_ALIGNED(k_start, SZ_8M)) { kasan_init_shadow_8M(k_start, ALIGN_DOWN(k_end, SZ_8M), block); k_cur = ALIGN_DOWN(k_end, SZ_8M); if (k_cur == k_end) goto finish; } else { k_cur = k_start; } ret = kasan_init_shadow_page_tables(k_start, k_end); if (ret) return ret; for (; k_cur < k_end; k_cur += PAGE_SIZE) { pmd_t *pmd = pmd_off_k(k_cur); void *va = block + k_cur - k_start; pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL); if (k_cur < ALIGN_DOWN(k_end, SZ_512K)) pte = pte_mkhuge(pte); __set_pte_at(&init_mm, k_cur, pte_offset_kernel(pmd, k_cur), pte, 0); } finish: flush_tlb_kernel_range(k_start, k_end); return 0; }