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