^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * This file contains KASAN shadow initialization code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2015 Samsung Electronics Co., Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/kasan.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/pfn.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/pgalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "kasan.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * This page serves two purposes:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * - It used as early shadow memory. The entire shadow region populated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * with this page, before we will be able to setup normal shadow memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * - Latter it reused it as zero shadow to cover large ranges of memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * that allowed to access, but not handled by kasan (vmalloc/vmemmap ...).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) unsigned char kasan_early_shadow_page[PAGE_SIZE] __page_aligned_bss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #if CONFIG_PGTABLE_LEVELS > 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D] __page_aligned_bss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static inline bool kasan_p4d_table(pgd_t pgd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) return pgd_page(pgd) == virt_to_page(lm_alias(kasan_early_shadow_p4d));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static inline bool kasan_p4d_table(pgd_t pgd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #if CONFIG_PGTABLE_LEVELS > 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) pud_t kasan_early_shadow_pud[PTRS_PER_PUD] __page_aligned_bss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) static inline bool kasan_pud_table(p4d_t p4d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) return p4d_page(p4d) == virt_to_page(lm_alias(kasan_early_shadow_pud));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static inline bool kasan_pud_table(p4d_t p4d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #if CONFIG_PGTABLE_LEVELS > 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD] __page_aligned_bss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static inline bool kasan_pmd_table(pud_t pud)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) return pud_page(pud) == virt_to_page(lm_alias(kasan_early_shadow_pmd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static inline bool kasan_pmd_table(pud_t pud)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) pte_t kasan_early_shadow_pte[PTRS_PER_PTE + PTE_HWTABLE_PTRS]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) __page_aligned_bss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static inline bool kasan_pte_table(pmd_t pmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return pmd_page(pmd) == virt_to_page(lm_alias(kasan_early_shadow_pte));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static inline bool kasan_early_shadow_page_entry(pte_t pte)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return pte_page(pte) == virt_to_page(lm_alias(kasan_early_shadow_page));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static __init void *early_alloc(size_t size, int node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) void *ptr = memblock_alloc_try_nid(size, size, __pa(MAX_DMA_ADDRESS),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) MEMBLOCK_ALLOC_ACCESSIBLE, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (!ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) panic("%s: Failed to allocate %zu bytes align=%zx nid=%d from=%llx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) __func__, size, size, node, (u64)__pa(MAX_DMA_ADDRESS));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) static void __ref zero_pte_populate(pmd_t *pmd, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) pte_t *pte = pte_offset_kernel(pmd, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) pte_t zero_pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) zero_pte = pfn_pte(PFN_DOWN(__pa_symbol(kasan_early_shadow_page)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) PAGE_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) zero_pte = pte_wrprotect(zero_pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) while (addr + PAGE_SIZE <= end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) set_pte_at(&init_mm, addr, pte, zero_pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) addr += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) pte = pte_offset_kernel(pmd, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static int __ref zero_pmd_populate(pud_t *pud, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) pmd_t *pmd = pmd_offset(pud, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) unsigned long next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) next = pmd_addr_end(addr, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (IS_ALIGNED(addr, PMD_SIZE) && end - addr >= PMD_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) pmd_populate_kernel(&init_mm, pmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) lm_alias(kasan_early_shadow_pte));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (pmd_none(*pmd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) pte_t *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) if (slab_is_available())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) p = pte_alloc_one_kernel(&init_mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) p = early_alloc(PAGE_SIZE, NUMA_NO_NODE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (!p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) pmd_populate_kernel(&init_mm, pmd, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) zero_pte_populate(pmd, addr, next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) } while (pmd++, addr = next, addr != end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static int __ref zero_pud_populate(p4d_t *p4d, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) pud_t *pud = pud_offset(p4d, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) unsigned long next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) next = pud_addr_end(addr, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (IS_ALIGNED(addr, PUD_SIZE) && end - addr >= PUD_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) pmd_t *pmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) pud_populate(&init_mm, pud,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) lm_alias(kasan_early_shadow_pmd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) pmd = pmd_offset(pud, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) pmd_populate_kernel(&init_mm, pmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) lm_alias(kasan_early_shadow_pte));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) if (pud_none(*pud)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) pmd_t *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) if (slab_is_available()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) p = pmd_alloc(&init_mm, pud, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (!p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) pud_populate(&init_mm, pud,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) early_alloc(PAGE_SIZE, NUMA_NO_NODE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) zero_pmd_populate(pud, addr, next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) } while (pud++, addr = next, addr != end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) static int __ref zero_p4d_populate(pgd_t *pgd, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) p4d_t *p4d = p4d_offset(pgd, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) unsigned long next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) next = p4d_addr_end(addr, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (IS_ALIGNED(addr, P4D_SIZE) && end - addr >= P4D_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) pud_t *pud;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) pmd_t *pmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) p4d_populate(&init_mm, p4d,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) lm_alias(kasan_early_shadow_pud));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) pud = pud_offset(p4d, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) pud_populate(&init_mm, pud,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) lm_alias(kasan_early_shadow_pmd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) pmd = pmd_offset(pud, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) pmd_populate_kernel(&init_mm, pmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) lm_alias(kasan_early_shadow_pte));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (p4d_none(*p4d)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) pud_t *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) if (slab_is_available()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) p = pud_alloc(&init_mm, p4d, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (!p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) p4d_populate(&init_mm, p4d,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) early_alloc(PAGE_SIZE, NUMA_NO_NODE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) zero_pud_populate(p4d, addr, next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) } while (p4d++, addr = next, addr != end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) * kasan_populate_early_shadow - populate shadow memory region with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) * kasan_early_shadow_page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) * @shadow_start - start of the memory range to populate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) * @shadow_end - end of the memory range to populate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) int __ref kasan_populate_early_shadow(const void *shadow_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) const void *shadow_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) unsigned long addr = (unsigned long)shadow_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) unsigned long end = (unsigned long)shadow_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) pgd_t *pgd = pgd_offset_k(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) unsigned long next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) next = pgd_addr_end(addr, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if (IS_ALIGNED(addr, PGDIR_SIZE) && end - addr >= PGDIR_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) p4d_t *p4d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) pud_t *pud;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) pmd_t *pmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) * kasan_early_shadow_pud should be populated with pmds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) * at this moment.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) * [pud,pmd]_populate*() below needed only for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) * 3,2 - level page tables where we don't have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) * puds,pmds, so pgd_populate(), pud_populate()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) * is noops.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) pgd_populate(&init_mm, pgd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) lm_alias(kasan_early_shadow_p4d));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) p4d = p4d_offset(pgd, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) p4d_populate(&init_mm, p4d,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) lm_alias(kasan_early_shadow_pud));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) pud = pud_offset(p4d, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) pud_populate(&init_mm, pud,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) lm_alias(kasan_early_shadow_pmd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) pmd = pmd_offset(pud, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) pmd_populate_kernel(&init_mm, pmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) lm_alias(kasan_early_shadow_pte));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) if (pgd_none(*pgd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) p4d_t *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (slab_is_available()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) p = p4d_alloc(&init_mm, pgd, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) if (!p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) pgd_populate(&init_mm, pgd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) early_alloc(PAGE_SIZE, NUMA_NO_NODE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) zero_p4d_populate(pgd, addr, next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) } while (pgd++, addr = next, addr != end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) static void kasan_free_pte(pte_t *pte_start, pmd_t *pmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) pte_t *pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) for (i = 0; i < PTRS_PER_PTE; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) pte = pte_start + i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) if (!pte_none(*pte))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) pte_free_kernel(&init_mm, (pte_t *)page_to_virt(pmd_page(*pmd)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) pmd_clear(pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) static void kasan_free_pmd(pmd_t *pmd_start, pud_t *pud)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) pmd_t *pmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) for (i = 0; i < PTRS_PER_PMD; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) pmd = pmd_start + i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) if (!pmd_none(*pmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) pmd_free(&init_mm, (pmd_t *)page_to_virt(pud_page(*pud)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) pud_clear(pud);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) static void kasan_free_pud(pud_t *pud_start, p4d_t *p4d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) pud_t *pud;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) for (i = 0; i < PTRS_PER_PUD; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) pud = pud_start + i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) if (!pud_none(*pud))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) pud_free(&init_mm, (pud_t *)page_to_virt(p4d_page(*p4d)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) p4d_clear(p4d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) static void kasan_free_p4d(p4d_t *p4d_start, pgd_t *pgd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) p4d_t *p4d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) for (i = 0; i < PTRS_PER_P4D; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) p4d = p4d_start + i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) if (!p4d_none(*p4d))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) p4d_free(&init_mm, (p4d_t *)page_to_virt(pgd_page(*pgd)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) pgd_clear(pgd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) static void kasan_remove_pte_table(pte_t *pte, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) unsigned long next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) for (; addr < end; addr = next, pte++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) next = (addr + PAGE_SIZE) & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) if (next > end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) next = end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) if (!pte_present(*pte))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) if (WARN_ON(!kasan_early_shadow_page_entry(*pte)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) pte_clear(&init_mm, addr, pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) static void kasan_remove_pmd_table(pmd_t *pmd, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) unsigned long next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) for (; addr < end; addr = next, pmd++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) pte_t *pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) next = pmd_addr_end(addr, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) if (!pmd_present(*pmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) if (kasan_pte_table(*pmd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) if (IS_ALIGNED(addr, PMD_SIZE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) IS_ALIGNED(next, PMD_SIZE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) pmd_clear(pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) pte = pte_offset_kernel(pmd, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) kasan_remove_pte_table(pte, addr, next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) kasan_free_pte(pte_offset_kernel(pmd, 0), pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) static void kasan_remove_pud_table(pud_t *pud, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) unsigned long next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) for (; addr < end; addr = next, pud++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) pmd_t *pmd, *pmd_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) next = pud_addr_end(addr, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) if (!pud_present(*pud))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) if (kasan_pmd_table(*pud)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) if (IS_ALIGNED(addr, PUD_SIZE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) IS_ALIGNED(next, PUD_SIZE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) pud_clear(pud);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) pmd = pmd_offset(pud, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) pmd_base = pmd_offset(pud, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) kasan_remove_pmd_table(pmd, addr, next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) kasan_free_pmd(pmd_base, pud);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) static void kasan_remove_p4d_table(p4d_t *p4d, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) unsigned long end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) unsigned long next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) for (; addr < end; addr = next, p4d++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) pud_t *pud;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) next = p4d_addr_end(addr, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) if (!p4d_present(*p4d))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) if (kasan_pud_table(*p4d)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) if (IS_ALIGNED(addr, P4D_SIZE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) IS_ALIGNED(next, P4D_SIZE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) p4d_clear(p4d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) pud = pud_offset(p4d, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) kasan_remove_pud_table(pud, addr, next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) kasan_free_pud(pud_offset(p4d, 0), p4d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) void kasan_remove_zero_shadow(void *start, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) unsigned long addr, end, next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) pgd_t *pgd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) addr = (unsigned long)kasan_mem_to_shadow(start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) end = addr + (size >> KASAN_SHADOW_SCALE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) if (WARN_ON((unsigned long)start % KASAN_MEMORY_PER_SHADOW_PAGE) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) WARN_ON(size % KASAN_MEMORY_PER_SHADOW_PAGE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) for (; addr < end; addr = next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) p4d_t *p4d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) next = pgd_addr_end(addr, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) pgd = pgd_offset_k(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) if (!pgd_present(*pgd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) if (kasan_p4d_table(*pgd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) if (IS_ALIGNED(addr, PGDIR_SIZE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) IS_ALIGNED(next, PGDIR_SIZE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) pgd_clear(pgd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) p4d = p4d_offset(pgd, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) kasan_remove_p4d_table(p4d, addr, next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) kasan_free_p4d(p4d_offset(pgd, 0), pgd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) int kasan_add_zero_shadow(void *start, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) void *shadow_start, *shadow_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) shadow_start = kasan_mem_to_shadow(start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) shadow_end = shadow_start + (size >> KASAN_SHADOW_SCALE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) if (WARN_ON((unsigned long)start % KASAN_MEMORY_PER_SHADOW_PAGE) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) WARN_ON(size % KASAN_MEMORY_PER_SHADOW_PAGE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) ret = kasan_populate_early_shadow(shadow_start, shadow_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) kasan_remove_zero_shadow(start, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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