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291 lines
8.5 KiB
291 lines
8.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* This file contains kasan initialization code for ARM64. |
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* |
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* Copyright (c) 2015 Samsung Electronics Co., Ltd. |
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* Author: Andrey Ryabinin <[email protected]> |
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*/ |
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#define pr_fmt(fmt) "kasan: " fmt |
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#include <linux/kasan.h> |
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#include <linux/kernel.h> |
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#include <linux/sched/task.h> |
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#include <linux/memblock.h> |
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#include <linux/start_kernel.h> |
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#include <linux/mm.h> |
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#include <asm/mmu_context.h> |
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#include <asm/kernel-pgtable.h> |
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#include <asm/page.h> |
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#include <asm/pgalloc.h> |
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#include <asm/sections.h> |
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#include <asm/tlbflush.h> |
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#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) |
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static pgd_t tmp_pg_dir[PTRS_PER_PGD] __initdata __aligned(PGD_SIZE); |
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/* |
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* The p*d_populate functions call virt_to_phys implicitly so they can't be used |
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* directly on kernel symbols (bm_p*d). All the early functions are called too |
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* early to use lm_alias so __p*d_populate functions must be used to populate |
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* with the physical address from __pa_symbol. |
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*/ |
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static phys_addr_t __init kasan_alloc_zeroed_page(int node) |
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{ |
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void *p = memblock_alloc_try_nid(PAGE_SIZE, PAGE_SIZE, |
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__pa(MAX_DMA_ADDRESS), |
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MEMBLOCK_ALLOC_KASAN, node); |
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if (!p) |
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panic("%s: Failed to allocate %lu bytes align=0x%lx nid=%d from=%llx\n", |
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__func__, PAGE_SIZE, PAGE_SIZE, node, |
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__pa(MAX_DMA_ADDRESS)); |
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return __pa(p); |
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} |
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static phys_addr_t __init kasan_alloc_raw_page(int node) |
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{ |
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void *p = memblock_alloc_try_nid_raw(PAGE_SIZE, PAGE_SIZE, |
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__pa(MAX_DMA_ADDRESS), |
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MEMBLOCK_ALLOC_KASAN, node); |
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if (!p) |
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panic("%s: Failed to allocate %lu bytes align=0x%lx nid=%d from=%llx\n", |
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__func__, PAGE_SIZE, PAGE_SIZE, node, |
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__pa(MAX_DMA_ADDRESS)); |
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return __pa(p); |
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} |
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static pte_t *__init kasan_pte_offset(pmd_t *pmdp, unsigned long addr, int node, |
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bool early) |
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{ |
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if (pmd_none(READ_ONCE(*pmdp))) { |
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phys_addr_t pte_phys = early ? |
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__pa_symbol(kasan_early_shadow_pte) |
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: kasan_alloc_zeroed_page(node); |
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__pmd_populate(pmdp, pte_phys, PMD_TYPE_TABLE); |
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} |
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return early ? pte_offset_kimg(pmdp, addr) |
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: pte_offset_kernel(pmdp, addr); |
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} |
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static pmd_t *__init kasan_pmd_offset(pud_t *pudp, unsigned long addr, int node, |
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bool early) |
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{ |
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if (pud_none(READ_ONCE(*pudp))) { |
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phys_addr_t pmd_phys = early ? |
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__pa_symbol(kasan_early_shadow_pmd) |
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: kasan_alloc_zeroed_page(node); |
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__pud_populate(pudp, pmd_phys, PMD_TYPE_TABLE); |
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} |
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return early ? pmd_offset_kimg(pudp, addr) : pmd_offset(pudp, addr); |
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} |
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static pud_t *__init kasan_pud_offset(p4d_t *p4dp, unsigned long addr, int node, |
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bool early) |
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{ |
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if (p4d_none(READ_ONCE(*p4dp))) { |
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phys_addr_t pud_phys = early ? |
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__pa_symbol(kasan_early_shadow_pud) |
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: kasan_alloc_zeroed_page(node); |
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__p4d_populate(p4dp, pud_phys, PMD_TYPE_TABLE); |
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} |
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return early ? pud_offset_kimg(p4dp, addr) : pud_offset(p4dp, addr); |
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} |
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static void __init kasan_pte_populate(pmd_t *pmdp, unsigned long addr, |
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unsigned long end, int node, bool early) |
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{ |
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unsigned long next; |
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pte_t *ptep = kasan_pte_offset(pmdp, addr, node, early); |
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do { |
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phys_addr_t page_phys = early ? |
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__pa_symbol(kasan_early_shadow_page) |
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: kasan_alloc_raw_page(node); |
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if (!early) |
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memset(__va(page_phys), KASAN_SHADOW_INIT, PAGE_SIZE); |
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next = addr + PAGE_SIZE; |
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set_pte(ptep, pfn_pte(__phys_to_pfn(page_phys), PAGE_KERNEL)); |
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} while (ptep++, addr = next, addr != end && pte_none(READ_ONCE(*ptep))); |
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} |
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static void __init kasan_pmd_populate(pud_t *pudp, unsigned long addr, |
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unsigned long end, int node, bool early) |
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{ |
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unsigned long next; |
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pmd_t *pmdp = kasan_pmd_offset(pudp, addr, node, early); |
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do { |
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next = pmd_addr_end(addr, end); |
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kasan_pte_populate(pmdp, addr, next, node, early); |
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} while (pmdp++, addr = next, addr != end && pmd_none(READ_ONCE(*pmdp))); |
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} |
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static void __init kasan_pud_populate(p4d_t *p4dp, unsigned long addr, |
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unsigned long end, int node, bool early) |
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{ |
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unsigned long next; |
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pud_t *pudp = kasan_pud_offset(p4dp, addr, node, early); |
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do { |
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next = pud_addr_end(addr, end); |
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kasan_pmd_populate(pudp, addr, next, node, early); |
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} while (pudp++, addr = next, addr != end && pud_none(READ_ONCE(*pudp))); |
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} |
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static void __init kasan_p4d_populate(pgd_t *pgdp, unsigned long addr, |
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unsigned long end, int node, bool early) |
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{ |
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unsigned long next; |
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p4d_t *p4dp = p4d_offset(pgdp, addr); |
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do { |
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next = p4d_addr_end(addr, end); |
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kasan_pud_populate(p4dp, addr, next, node, early); |
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} while (p4dp++, addr = next, addr != end); |
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} |
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static void __init kasan_pgd_populate(unsigned long addr, unsigned long end, |
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int node, bool early) |
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{ |
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unsigned long next; |
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pgd_t *pgdp; |
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pgdp = pgd_offset_k(addr); |
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do { |
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next = pgd_addr_end(addr, end); |
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kasan_p4d_populate(pgdp, addr, next, node, early); |
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} while (pgdp++, addr = next, addr != end); |
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} |
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/* The early shadow maps everything to a single page of zeroes */ |
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asmlinkage void __init kasan_early_init(void) |
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{ |
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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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BUILD_BUG_ON(!IS_ALIGNED(_KASAN_SHADOW_START(VA_BITS), PGDIR_SIZE)); |
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BUILD_BUG_ON(!IS_ALIGNED(_KASAN_SHADOW_START(VA_BITS_MIN), PGDIR_SIZE)); |
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BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_END, PGDIR_SIZE)); |
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kasan_pgd_populate(KASAN_SHADOW_START, KASAN_SHADOW_END, NUMA_NO_NODE, |
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true); |
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} |
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/* Set up full kasan mappings, ensuring that the mapped pages are zeroed */ |
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static void __init kasan_map_populate(unsigned long start, unsigned long end, |
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int node) |
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{ |
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kasan_pgd_populate(start & PAGE_MASK, PAGE_ALIGN(end), node, false); |
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} |
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/* |
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* Copy the current shadow region into a new pgdir. |
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*/ |
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void __init kasan_copy_shadow(pgd_t *pgdir) |
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{ |
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pgd_t *pgdp, *pgdp_new, *pgdp_end; |
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pgdp = pgd_offset_k(KASAN_SHADOW_START); |
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pgdp_end = pgd_offset_k(KASAN_SHADOW_END); |
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pgdp_new = pgd_offset_pgd(pgdir, KASAN_SHADOW_START); |
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do { |
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set_pgd(pgdp_new, READ_ONCE(*pgdp)); |
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} while (pgdp++, pgdp_new++, pgdp != pgdp_end); |
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} |
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static void __init clear_pgds(unsigned long start, |
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unsigned long end) |
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{ |
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/* |
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* Remove references to kasan page tables from |
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* swapper_pg_dir. pgd_clear() can't be used |
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* here because it's nop on 2,3-level pagetable setups |
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*/ |
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for (; start < end; start += PGDIR_SIZE) |
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set_pgd(pgd_offset_k(start), __pgd(0)); |
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} |
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static void __init kasan_init_shadow(void) |
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{ |
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u64 kimg_shadow_start, kimg_shadow_end; |
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u64 mod_shadow_start, mod_shadow_end; |
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phys_addr_t pa_start, pa_end; |
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u64 i; |
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kimg_shadow_start = (u64)kasan_mem_to_shadow(_text) & PAGE_MASK; |
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kimg_shadow_end = PAGE_ALIGN((u64)kasan_mem_to_shadow(_end)); |
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mod_shadow_start = (u64)kasan_mem_to_shadow((void *)MODULES_VADDR); |
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mod_shadow_end = (u64)kasan_mem_to_shadow((void *)MODULES_END); |
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/* |
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* We are going to perform proper setup of shadow memory. |
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* At first we should unmap early shadow (clear_pgds() call below). |
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* However, instrumented code couldn't execute without shadow memory. |
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* tmp_pg_dir used to keep early shadow mapped until full shadow |
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* setup will be finished. |
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*/ |
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memcpy(tmp_pg_dir, swapper_pg_dir, sizeof(tmp_pg_dir)); |
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dsb(ishst); |
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cpu_replace_ttbr1(lm_alias(tmp_pg_dir)); |
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clear_pgds(KASAN_SHADOW_START, KASAN_SHADOW_END); |
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kasan_map_populate(kimg_shadow_start, kimg_shadow_end, |
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early_pfn_to_nid(virt_to_pfn(lm_alias(_text)))); |
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kasan_populate_early_shadow(kasan_mem_to_shadow((void *)PAGE_END), |
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(void *)mod_shadow_start); |
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kasan_populate_early_shadow((void *)kimg_shadow_end, |
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(void *)KASAN_SHADOW_END); |
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if (kimg_shadow_start > mod_shadow_end) |
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kasan_populate_early_shadow((void *)mod_shadow_end, |
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(void *)kimg_shadow_start); |
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for_each_mem_range(i, &pa_start, &pa_end) { |
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void *start = (void *)__phys_to_virt(pa_start); |
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void *end = (void *)__phys_to_virt(pa_end); |
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if (start >= end) |
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break; |
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kasan_map_populate((unsigned long)kasan_mem_to_shadow(start), |
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(unsigned long)kasan_mem_to_shadow(end), |
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early_pfn_to_nid(virt_to_pfn(start))); |
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} |
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/* |
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* KAsan may reuse the contents of kasan_early_shadow_pte directly, |
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* so we should make sure that it maps the zero page read-only. |
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*/ |
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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(sym_to_pfn(kasan_early_shadow_page), |
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PAGE_KERNEL_RO)); |
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memset(kasan_early_shadow_page, KASAN_SHADOW_INIT, PAGE_SIZE); |
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cpu_replace_ttbr1(lm_alias(swapper_pg_dir)); |
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} |
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static void __init kasan_init_depth(void) |
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{ |
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init_task.kasan_depth = 0; |
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} |
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void __init kasan_init(void) |
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{ |
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kasan_init_shadow(); |
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kasan_init_depth(); |
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#if defined(CONFIG_KASAN_GENERIC) |
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/* CONFIG_KASAN_SW_TAGS also requires kasan_init_sw_tags(). */ |
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pr_info("KernelAddressSanitizer initialized\n"); |
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#endif |
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} |
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#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
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