475 lines
14 KiB
C
475 lines
14 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2019 Andes Technology Corporation
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#include <linux/pfn.h>
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#include <linux/init_task.h>
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#include <linux/kasan.h>
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#include <linux/kernel.h>
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#include <linux/memblock.h>
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#include <linux/pgtable.h>
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#include <asm/tlbflush.h>
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#include <asm/fixmap.h>
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#include <asm/pgalloc.h>
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/*
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* Kasan shadow region must lie at a fixed address across sv39, sv48 and sv57
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* which is right before the kernel.
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*
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* For sv39, the region is aligned on PGDIR_SIZE so we only need to populate
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* the page global directory with kasan_early_shadow_pmd.
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*
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* For sv48 and sv57, the region is not aligned on PGDIR_SIZE so the mapping
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* must be divided as follows:
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* - the first PGD entry, although incomplete, is populated with
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* kasan_early_shadow_pud/p4d
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* - the PGD entries in the middle are populated with kasan_early_shadow_pud/p4d
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* - the last PGD entry is shared with the kernel mapping so populated at the
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* lower levels pud/p4d
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*
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* In addition, when shallow populating a kasan region (for example vmalloc),
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* this region may also not be aligned on PGDIR size, so we must go down to the
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* pud level too.
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*/
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extern pgd_t early_pg_dir[PTRS_PER_PGD];
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static void __init kasan_populate_pte(pmd_t *pmd, unsigned long vaddr, unsigned long end)
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{
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phys_addr_t phys_addr;
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pte_t *ptep, *base_pte;
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if (pmd_none(*pmd))
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base_pte = memblock_alloc(PTRS_PER_PTE * sizeof(pte_t), PAGE_SIZE);
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else
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base_pte = (pte_t *)pmd_page_vaddr(*pmd);
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ptep = base_pte + pte_index(vaddr);
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do {
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if (pte_none(*ptep)) {
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phys_addr = memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
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set_pte(ptep, pfn_pte(PFN_DOWN(phys_addr), PAGE_KERNEL));
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}
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} while (ptep++, vaddr += PAGE_SIZE, vaddr != end);
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set_pmd(pmd, pfn_pmd(PFN_DOWN(__pa(base_pte)), PAGE_TABLE));
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}
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static void __init kasan_populate_pmd(pud_t *pud, unsigned long vaddr, unsigned long end)
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{
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phys_addr_t phys_addr;
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pmd_t *pmdp, *base_pmd;
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unsigned long next;
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if (pud_none(*pud)) {
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base_pmd = memblock_alloc(PTRS_PER_PMD * sizeof(pmd_t), PAGE_SIZE);
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} else {
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base_pmd = (pmd_t *)pud_pgtable(*pud);
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if (base_pmd == lm_alias(kasan_early_shadow_pmd))
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base_pmd = memblock_alloc(PTRS_PER_PMD * sizeof(pmd_t), PAGE_SIZE);
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}
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pmdp = base_pmd + pmd_index(vaddr);
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do {
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next = pmd_addr_end(vaddr, end);
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if (pmd_none(*pmdp) && IS_ALIGNED(vaddr, PMD_SIZE) && (next - vaddr) >= PMD_SIZE) {
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phys_addr = memblock_phys_alloc(PMD_SIZE, PMD_SIZE);
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if (phys_addr) {
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set_pmd(pmdp, pfn_pmd(PFN_DOWN(phys_addr), PAGE_KERNEL));
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continue;
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}
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}
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kasan_populate_pte(pmdp, vaddr, next);
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} while (pmdp++, vaddr = next, vaddr != end);
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/*
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* Wait for the whole PGD to be populated before setting the PGD in
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* the page table, otherwise, if we did set the PGD before populating
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* it entirely, memblock could allocate a page at a physical address
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* where KASAN is not populated yet and then we'd get a page fault.
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*/
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set_pud(pud, pfn_pud(PFN_DOWN(__pa(base_pmd)), PAGE_TABLE));
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}
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static void __init kasan_populate_pud(pgd_t *pgd,
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unsigned long vaddr, unsigned long end,
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bool early)
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{
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phys_addr_t phys_addr;
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pud_t *pudp, *base_pud;
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unsigned long next;
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if (early) {
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/*
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* We can't use pgd_page_vaddr here as it would return a linear
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* mapping address but it is not mapped yet, but when populating
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* early_pg_dir, we need the physical address and when populating
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* swapper_pg_dir, we need the kernel virtual address so use
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* pt_ops facility.
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*/
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base_pud = pt_ops.get_pud_virt(pfn_to_phys(_pgd_pfn(*pgd)));
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} else if (pgd_none(*pgd)) {
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base_pud = memblock_alloc(PTRS_PER_PUD * sizeof(pud_t), PAGE_SIZE);
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memcpy(base_pud, (void *)kasan_early_shadow_pud,
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sizeof(pud_t) * PTRS_PER_PUD);
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} else {
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base_pud = (pud_t *)pgd_page_vaddr(*pgd);
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if (base_pud == lm_alias(kasan_early_shadow_pud)) {
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base_pud = memblock_alloc(PTRS_PER_PUD * sizeof(pud_t), PAGE_SIZE);
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memcpy(base_pud, (void *)kasan_early_shadow_pud,
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sizeof(pud_t) * PTRS_PER_PUD);
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}
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}
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pudp = base_pud + pud_index(vaddr);
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do {
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next = pud_addr_end(vaddr, end);
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if (pud_none(*pudp) && IS_ALIGNED(vaddr, PUD_SIZE) && (next - vaddr) >= PUD_SIZE) {
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if (early) {
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phys_addr = __pa(((uintptr_t)kasan_early_shadow_pmd));
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set_pud(pudp, pfn_pud(PFN_DOWN(phys_addr), PAGE_TABLE));
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continue;
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} else {
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phys_addr = memblock_phys_alloc(PUD_SIZE, PUD_SIZE);
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if (phys_addr) {
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set_pud(pudp, pfn_pud(PFN_DOWN(phys_addr), PAGE_KERNEL));
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continue;
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}
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}
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}
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kasan_populate_pmd(pudp, vaddr, next);
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} while (pudp++, vaddr = next, vaddr != end);
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/*
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* Wait for the whole PGD to be populated before setting the PGD in
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* the page table, otherwise, if we did set the PGD before populating
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* it entirely, memblock could allocate a page at a physical address
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* where KASAN is not populated yet and then we'd get a page fault.
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*/
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if (!early)
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set_pgd(pgd, pfn_pgd(PFN_DOWN(__pa(base_pud)), PAGE_TABLE));
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}
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static void __init kasan_populate_p4d(pgd_t *pgd,
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unsigned long vaddr, unsigned long end,
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bool early)
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{
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phys_addr_t phys_addr;
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p4d_t *p4dp, *base_p4d;
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unsigned long next;
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if (early) {
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/*
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* We can't use pgd_page_vaddr here as it would return a linear
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* mapping address but it is not mapped yet, but when populating
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* early_pg_dir, we need the physical address and when populating
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* swapper_pg_dir, we need the kernel virtual address so use
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* pt_ops facility.
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*/
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base_p4d = pt_ops.get_p4d_virt(pfn_to_phys(_pgd_pfn(*pgd)));
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} else {
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base_p4d = (p4d_t *)pgd_page_vaddr(*pgd);
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if (base_p4d == lm_alias(kasan_early_shadow_p4d)) {
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base_p4d = memblock_alloc(PTRS_PER_PUD * sizeof(p4d_t), PAGE_SIZE);
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memcpy(base_p4d, (void *)kasan_early_shadow_p4d,
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sizeof(p4d_t) * PTRS_PER_P4D);
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}
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}
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p4dp = base_p4d + p4d_index(vaddr);
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do {
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next = p4d_addr_end(vaddr, end);
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if (p4d_none(*p4dp) && IS_ALIGNED(vaddr, P4D_SIZE) && (next - vaddr) >= P4D_SIZE) {
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if (early) {
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phys_addr = __pa(((uintptr_t)kasan_early_shadow_pud));
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set_p4d(p4dp, pfn_p4d(PFN_DOWN(phys_addr), PAGE_TABLE));
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continue;
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} else {
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phys_addr = memblock_phys_alloc(P4D_SIZE, P4D_SIZE);
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if (phys_addr) {
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set_p4d(p4dp, pfn_p4d(PFN_DOWN(phys_addr), PAGE_KERNEL));
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continue;
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}
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}
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}
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kasan_populate_pud((pgd_t *)p4dp, vaddr, next, early);
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} while (p4dp++, vaddr = next, vaddr != end);
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/*
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* Wait for the whole P4D to be populated before setting the P4D in
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* the page table, otherwise, if we did set the P4D before populating
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* it entirely, memblock could allocate a page at a physical address
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* where KASAN is not populated yet and then we'd get a page fault.
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*/
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if (!early)
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set_pgd(pgd, pfn_pgd(PFN_DOWN(__pa(base_p4d)), PAGE_TABLE));
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}
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#define kasan_early_shadow_pgd_next (pgtable_l5_enabled ? \
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(uintptr_t)kasan_early_shadow_p4d : \
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(pgtable_l4_enabled ? \
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(uintptr_t)kasan_early_shadow_pud : \
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(uintptr_t)kasan_early_shadow_pmd))
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#define kasan_populate_pgd_next(pgdp, vaddr, next, early) \
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(pgtable_l5_enabled ? \
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kasan_populate_p4d(pgdp, vaddr, next, early) : \
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(pgtable_l4_enabled ? \
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kasan_populate_pud(pgdp, vaddr, next, early) : \
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kasan_populate_pmd((pud_t *)pgdp, vaddr, next)))
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static void __init kasan_populate_pgd(pgd_t *pgdp,
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unsigned long vaddr, unsigned long end,
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bool early)
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{
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phys_addr_t phys_addr;
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unsigned long next;
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do {
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next = pgd_addr_end(vaddr, end);
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if (IS_ALIGNED(vaddr, PGDIR_SIZE) && (next - vaddr) >= PGDIR_SIZE) {
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if (early) {
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phys_addr = __pa((uintptr_t)kasan_early_shadow_pgd_next);
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set_pgd(pgdp, pfn_pgd(PFN_DOWN(phys_addr), PAGE_TABLE));
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continue;
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} else if (pgd_page_vaddr(*pgdp) ==
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(unsigned long)lm_alias(kasan_early_shadow_pgd_next)) {
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/*
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* pgdp can't be none since kasan_early_init
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* initialized all KASAN shadow region with
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* kasan_early_shadow_pud: if this is still the
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* case, that means we can try to allocate a
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* hugepage as a replacement.
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*/
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phys_addr = memblock_phys_alloc(PGDIR_SIZE, PGDIR_SIZE);
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if (phys_addr) {
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set_pgd(pgdp, pfn_pgd(PFN_DOWN(phys_addr), PAGE_KERNEL));
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continue;
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}
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}
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}
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kasan_populate_pgd_next(pgdp, vaddr, next, early);
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} while (pgdp++, vaddr = next, vaddr != end);
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}
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asmlinkage void __init kasan_early_init(void)
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{
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uintptr_t i;
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BUILD_BUG_ON(KASAN_SHADOW_OFFSET !=
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KASAN_SHADOW_END - (1UL << (64 - KASAN_SHADOW_SCALE_SHIFT)));
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for (i = 0; i < PTRS_PER_PTE; ++i)
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set_pte(kasan_early_shadow_pte + i,
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pfn_pte(virt_to_pfn(kasan_early_shadow_page), PAGE_KERNEL));
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for (i = 0; i < PTRS_PER_PMD; ++i)
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set_pmd(kasan_early_shadow_pmd + i,
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pfn_pmd(PFN_DOWN
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(__pa((uintptr_t)kasan_early_shadow_pte)),
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PAGE_TABLE));
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if (pgtable_l4_enabled) {
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for (i = 0; i < PTRS_PER_PUD; ++i)
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set_pud(kasan_early_shadow_pud + i,
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pfn_pud(PFN_DOWN
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(__pa(((uintptr_t)kasan_early_shadow_pmd))),
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PAGE_TABLE));
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}
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if (pgtable_l5_enabled) {
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for (i = 0; i < PTRS_PER_P4D; ++i)
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set_p4d(kasan_early_shadow_p4d + i,
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pfn_p4d(PFN_DOWN
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(__pa(((uintptr_t)kasan_early_shadow_pud))),
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PAGE_TABLE));
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}
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kasan_populate_pgd(early_pg_dir + pgd_index(KASAN_SHADOW_START),
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KASAN_SHADOW_START, KASAN_SHADOW_END, true);
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local_flush_tlb_all();
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}
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void __init kasan_swapper_init(void)
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{
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kasan_populate_pgd(pgd_offset_k(KASAN_SHADOW_START),
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KASAN_SHADOW_START, KASAN_SHADOW_END, true);
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local_flush_tlb_all();
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}
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static void __init kasan_populate(void *start, void *end)
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{
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unsigned long vaddr = (unsigned long)start & PAGE_MASK;
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unsigned long vend = PAGE_ALIGN((unsigned long)end);
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kasan_populate_pgd(pgd_offset_k(vaddr), vaddr, vend, false);
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local_flush_tlb_all();
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memset(start, KASAN_SHADOW_INIT, end - start);
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}
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static void __init kasan_shallow_populate_pmd(pgd_t *pgdp,
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unsigned long vaddr, unsigned long end)
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{
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unsigned long next;
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pmd_t *pmdp, *base_pmd;
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bool is_kasan_pte;
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base_pmd = (pmd_t *)pgd_page_vaddr(*pgdp);
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pmdp = base_pmd + pmd_index(vaddr);
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do {
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|
next = pmd_addr_end(vaddr, end);
|
||
|
|
is_kasan_pte = (pmd_pgtable(*pmdp) == lm_alias(kasan_early_shadow_pte));
|
||
|
|
|
||
|
|
if (is_kasan_pte)
|
||
|
|
pmd_clear(pmdp);
|
||
|
|
} while (pmdp++, vaddr = next, vaddr != end);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __init kasan_shallow_populate_pud(pgd_t *pgdp,
|
||
|
|
unsigned long vaddr, unsigned long end)
|
||
|
|
{
|
||
|
|
unsigned long next;
|
||
|
|
pud_t *pudp, *base_pud;
|
||
|
|
pmd_t *base_pmd;
|
||
|
|
bool is_kasan_pmd;
|
||
|
|
|
||
|
|
base_pud = (pud_t *)pgd_page_vaddr(*pgdp);
|
||
|
|
pudp = base_pud + pud_index(vaddr);
|
||
|
|
|
||
|
|
do {
|
||
|
|
next = pud_addr_end(vaddr, end);
|
||
|
|
is_kasan_pmd = (pud_pgtable(*pudp) == lm_alias(kasan_early_shadow_pmd));
|
||
|
|
|
||
|
|
if (!is_kasan_pmd)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
base_pmd = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
|
||
|
|
set_pud(pudp, pfn_pud(PFN_DOWN(__pa(base_pmd)), PAGE_TABLE));
|
||
|
|
|
||
|
|
if (IS_ALIGNED(vaddr, PUD_SIZE) && (next - vaddr) >= PUD_SIZE)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
memcpy(base_pmd, (void *)kasan_early_shadow_pmd, PAGE_SIZE);
|
||
|
|
kasan_shallow_populate_pmd((pgd_t *)pudp, vaddr, next);
|
||
|
|
} while (pudp++, vaddr = next, vaddr != end);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __init kasan_shallow_populate_p4d(pgd_t *pgdp,
|
||
|
|
unsigned long vaddr, unsigned long end)
|
||
|
|
{
|
||
|
|
unsigned long next;
|
||
|
|
p4d_t *p4dp, *base_p4d;
|
||
|
|
pud_t *base_pud;
|
||
|
|
bool is_kasan_pud;
|
||
|
|
|
||
|
|
base_p4d = (p4d_t *)pgd_page_vaddr(*pgdp);
|
||
|
|
p4dp = base_p4d + p4d_index(vaddr);
|
||
|
|
|
||
|
|
do {
|
||
|
|
next = p4d_addr_end(vaddr, end);
|
||
|
|
is_kasan_pud = (p4d_pgtable(*p4dp) == lm_alias(kasan_early_shadow_pud));
|
||
|
|
|
||
|
|
if (!is_kasan_pud)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
base_pud = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
|
||
|
|
set_p4d(p4dp, pfn_p4d(PFN_DOWN(__pa(base_pud)), PAGE_TABLE));
|
||
|
|
|
||
|
|
if (IS_ALIGNED(vaddr, P4D_SIZE) && (next - vaddr) >= P4D_SIZE)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
memcpy(base_pud, (void *)kasan_early_shadow_pud, PAGE_SIZE);
|
||
|
|
kasan_shallow_populate_pud((pgd_t *)p4dp, vaddr, next);
|
||
|
|
} while (p4dp++, vaddr = next, vaddr != end);
|
||
|
|
}
|
||
|
|
|
||
|
|
#define kasan_shallow_populate_pgd_next(pgdp, vaddr, next) \
|
||
|
|
(pgtable_l5_enabled ? \
|
||
|
|
kasan_shallow_populate_p4d(pgdp, vaddr, next) : \
|
||
|
|
(pgtable_l4_enabled ? \
|
||
|
|
kasan_shallow_populate_pud(pgdp, vaddr, next) : \
|
||
|
|
kasan_shallow_populate_pmd(pgdp, vaddr, next)))
|
||
|
|
|
||
|
|
static void __init kasan_shallow_populate_pgd(unsigned long vaddr, unsigned long end)
|
||
|
|
{
|
||
|
|
unsigned long next;
|
||
|
|
void *p;
|
||
|
|
pgd_t *pgd_k = pgd_offset_k(vaddr);
|
||
|
|
bool is_kasan_pgd_next;
|
||
|
|
|
||
|
|
do {
|
||
|
|
next = pgd_addr_end(vaddr, end);
|
||
|
|
is_kasan_pgd_next = (pgd_page_vaddr(*pgd_k) ==
|
||
|
|
(unsigned long)lm_alias(kasan_early_shadow_pgd_next));
|
||
|
|
|
||
|
|
if (is_kasan_pgd_next) {
|
||
|
|
p = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
|
||
|
|
set_pgd(pgd_k, pfn_pgd(PFN_DOWN(__pa(p)), PAGE_TABLE));
|
||
|
|
}
|
||
|
|
|
||
|
|
if (IS_ALIGNED(vaddr, PGDIR_SIZE) && (next - vaddr) >= PGDIR_SIZE)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
memcpy(p, (void *)kasan_early_shadow_pgd_next, PAGE_SIZE);
|
||
|
|
kasan_shallow_populate_pgd_next(pgd_k, vaddr, next);
|
||
|
|
} while (pgd_k++, vaddr = next, vaddr != end);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __init kasan_shallow_populate(void *start, void *end)
|
||
|
|
{
|
||
|
|
unsigned long vaddr = (unsigned long)start & PAGE_MASK;
|
||
|
|
unsigned long vend = PAGE_ALIGN((unsigned long)end);
|
||
|
|
|
||
|
|
kasan_shallow_populate_pgd(vaddr, vend);
|
||
|
|
local_flush_tlb_all();
|
||
|
|
}
|
||
|
|
|
||
|
|
void __init kasan_init(void)
|
||
|
|
{
|
||
|
|
phys_addr_t p_start, p_end;
|
||
|
|
u64 i;
|
||
|
|
|
||
|
|
if (IS_ENABLED(CONFIG_KASAN_VMALLOC))
|
||
|
|
kasan_shallow_populate(
|
||
|
|
(void *)kasan_mem_to_shadow((void *)VMALLOC_START),
|
||
|
|
(void *)kasan_mem_to_shadow((void *)VMALLOC_END));
|
||
|
|
|
||
|
|
/* Populate the linear mapping */
|
||
|
|
for_each_mem_range(i, &p_start, &p_end) {
|
||
|
|
void *start = (void *)__va(p_start);
|
||
|
|
void *end = (void *)__va(p_end);
|
||
|
|
|
||
|
|
if (start >= end)
|
||
|
|
break;
|
||
|
|
|
||
|
|
kasan_populate(kasan_mem_to_shadow(start), kasan_mem_to_shadow(end));
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Populate kernel, BPF, modules mapping */
|
||
|
|
kasan_populate(kasan_mem_to_shadow((const void *)MODULES_VADDR),
|
||
|
|
kasan_mem_to_shadow((const void *)MODULES_VADDR + SZ_2G));
|
||
|
|
|
||
|
|
for (i = 0; i < PTRS_PER_PTE; i++)
|
||
|
|
set_pte(&kasan_early_shadow_pte[i],
|
||
|
|
mk_pte(virt_to_page(kasan_early_shadow_page),
|
||
|
|
__pgprot(_PAGE_PRESENT | _PAGE_READ |
|
||
|
|
_PAGE_ACCESSED)));
|
||
|
|
|
||
|
|
memset(kasan_early_shadow_page, KASAN_SHADOW_INIT, PAGE_SIZE);
|
||
|
|
init_task.kasan_depth = 0;
|
||
|
|
}
|